> Subject: [PATCH 04/17] xen: Add essential and required interface headers
>
> From: Oleksandr Andrushchenko <oleksandr_andrushche...@epam.com>
>
> Add essential and required Xen interface headers only taken from
> the stable Linux kernel stable/linux-5.7.y at commit
> 66dfe45221605e11f38a0bf5eb2ee808cea7cfe7.
Please use commit <12+> ("commit header")
>
> These are better suited for U-boot than the original headers
> from Xen as they are the stripped versions of the same.
>
> At the same time use public protocols from Xen RELEASE-4.13.1, at
> commit 6278553325a9f76d37811923221b21db3882e017
Please use commit <12+> ("commit header")
Then:
Acked-by: Peng Fan <peng....@nxp.com>
> as those have more comments in them.
>
> Signed-off-by: Oleksandr Andrushchenko
> <oleksandr_andrushche...@epam.com>
> Signed-off-by: Anastasiia Lukianenko <anastasiia_lukiane...@epam.com>
> ---
> include/xen/arm/interface.h | 88 ++++
> include/xen/interface/event_channel.h | 281 ++++++++++
> include/xen/interface/grant_table.h | 582 +++++++++++++++++++++
> include/xen/interface/hvm/hvm_op.h | 69 +++
> include/xen/interface/hvm/params.h | 127 +++++
> include/xen/interface/io/blkif.h | 726
> ++++++++++++++++++++++++++
> include/xen/interface/io/console.h | 56 ++
> include/xen/interface/io/protocols.h | 42 ++
> include/xen/interface/io/ring.h | 479 +++++++++++++++++
> include/xen/interface/io/xenbus.h | 81 +++
> include/xen/interface/io/xs_wire.h | 151 ++++++
> include/xen/interface/memory.h | 332 ++++++++++++
> include/xen/interface/sched.h | 188 +++++++
> include/xen/interface/xen.h | 225 ++++++++
> 14 files changed, 3427 insertions(+)
> create mode 100644 include/xen/arm/interface.h
> create mode 100644 include/xen/interface/event_channel.h
> create mode 100644 include/xen/interface/grant_table.h
> create mode 100644 include/xen/interface/hvm/hvm_op.h
> create mode 100644 include/xen/interface/hvm/params.h
> create mode 100644 include/xen/interface/io/blkif.h
> create mode 100644 include/xen/interface/io/console.h
> create mode 100644 include/xen/interface/io/protocols.h
> create mode 100644 include/xen/interface/io/ring.h
> create mode 100644 include/xen/interface/io/xenbus.h
> create mode 100644 include/xen/interface/io/xs_wire.h
> create mode 100644 include/xen/interface/memory.h
> create mode 100644 include/xen/interface/sched.h
> create mode 100644 include/xen/interface/xen.h
>
> diff --git a/include/xen/arm/interface.h b/include/xen/arm/interface.h
> new file mode 100644
> index 0000000000..79d5ae8563
> --- /dev/null
> +++ b/include/xen/arm/interface.h
> @@ -0,0 +1,88 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/************************************************************
> ******************
> + * Guest OS interface to ARM Xen.
> + *
> + * Stefano Stabellini <stefano.stabell...@eu.citrix.com>, Citrix, 2012
> + */
> +
> +#ifndef _ASM_ARM_XEN_INTERFACE_H
> +#define _ASM_ARM_XEN_INTERFACE_H
> +
> +#ifndef __ASSEMBLY__
> +#include <linux/types.h>
> +#endif
> +
> +#define uint64_aligned_t u64 __attribute__((aligned(8)))
> +
> +#define __DEFINE_GUEST_HANDLE(name, type) \
> + typedef struct { union { type *p; uint64_aligned_t q; }; } \
> + __guest_handle_ ## name
> +
> +#define DEFINE_GUEST_HANDLE_STRUCT(name) \
> + __DEFINE_GUEST_HANDLE(name, struct name)
> +#define DEFINE_GUEST_HANDLE(name) __DEFINE_GUEST_HANDLE(name,
> name)
> +#define GUEST_HANDLE(name) __guest_handle_ ## name
> +
> +#define set_xen_guest_handle(hnd, val) \
> + do { \
> + if (sizeof(hnd) == 8) \
> + *(u64 *)&(hnd) = 0; \
> + (hnd).p = val; \
> + } while (0)
> +
> +#define __HYPERVISOR_platform_op_raw __HYPERVISOR_platform_op
> +
> +#ifndef __ASSEMBLY__
> +/* Explicitly size integers that represent pfns in the interface with
> + * Xen so that we can have one ABI that works for 32 and 64 bit guests.
> + * Note that this means that the xen_pfn_t type may be capable of
> + * representing pfn's which the guest cannot represent in its own pfn
> + * type. However since pfn space is controlled by the guest this is
> + * fine since it simply wouldn't be able to create any sure pfns in
> + * the first place.
> + */
> +typedef u64 xen_pfn_t;
> +#define PRI_xen_pfn "llx"
> +typedef u64 xen_ulong_t;
> +#define PRI_xen_ulong "llx"
> +typedef s64 xen_long_t;
> +#define PRI_xen_long "llx"
> +/* Guest handles for primitive C types. */
> +__DEFINE_GUEST_HANDLE(uchar, unsigned char);
> +__DEFINE_GUEST_HANDLE(uint, unsigned int);
> +DEFINE_GUEST_HANDLE(char);
> +DEFINE_GUEST_HANDLE(int);
> +DEFINE_GUEST_HANDLE(void);
> +DEFINE_GUEST_HANDLE(u64);
> +DEFINE_GUEST_HANDLE(u32);
> +DEFINE_GUEST_HANDLE(xen_pfn_t);
> +DEFINE_GUEST_HANDLE(xen_ulong_t);
> +
> +/* Maximum number of virtual CPUs in multi-processor guests. */
> +#define MAX_VIRT_CPUS 1
> +
> +struct arch_vcpu_info { };
> +struct arch_shared_info { };
> +
> +/* TODO: Move pvclock definitions some place arch independent */
> +struct pvclock_vcpu_time_info {
> + u32 version;
> + u32 pad0;
> + u64 tsc_timestamp;
> + u64 system_time;
> + u32 tsc_to_system_mul;
> + s8 tsc_shift;
> + u8 flags;
> + u8 pad[2];
> +} __attribute__((__packed__)); /* 32 bytes */
> +
> +/* It is OK to have a 12 bytes struct with no padding because it is packed */
> +struct pvclock_wall_clock {
> + u32 version;
> + u32 sec;
> + u32 nsec;
> + u32 sec_hi;
> +} __attribute__((__packed__));
> +#endif
> +
> +#endif /* _ASM_ARM_XEN_INTERFACE_H */
> diff --git a/include/xen/interface/event_channel.h
> b/include/xen/interface/event_channel.h
> new file mode 100644
> index 0000000000..8174999c2f
> --- /dev/null
> +++ b/include/xen/interface/event_channel.h
> @@ -0,0 +1,281 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/************************************************************
> ******************
> + * event_channel.h
> + *
> + * Event channels between domains.
> + *
> + * Copyright (c) 2003-2004, K A Fraser.
> + */
> +
> +#ifndef __XEN_PUBLIC_EVENT_CHANNEL_H__
> +#define __XEN_PUBLIC_EVENT_CHANNEL_H__
> +
> +#include <xen/interface/xen.h>
> +
> +typedef u32 evtchn_port_t;
> +DEFINE_GUEST_HANDLE(evtchn_port_t);
> +
> +/*
> + * EVTCHNOP_alloc_unbound: Allocate a port in domain <dom> and mark as
> + * accepting interdomain bindings from domain <remote_dom>. A fresh port
> + * is allocated in <dom> and returned as <port>.
> + * NOTES:
> + * 1. If the caller is unprivileged then <dom> must be DOMID_SELF.
> + * 2. <rdom> may be DOMID_SELF, allowing loopback connections.
> + */
> +#define EVTCHNOP_alloc_unbound 6
> +struct evtchn_alloc_unbound {
> + /* IN parameters */
> + domid_t dom, remote_dom;
> + /* OUT parameters */
> + evtchn_port_t port;
> +};
> +
> +/*
> + * EVTCHNOP_bind_interdomain: Construct an interdomain event channel
> between
> + * the calling domain and <remote_dom>. <remote_dom,remote_port> must
> identify
> + * a port that is unbound and marked as accepting bindings from the calling
> + * domain. A fresh port is allocated in the calling domain and returned as
> + * <local_port>.
> + * NOTES:
> + * 2. <remote_dom> may be DOMID_SELF, allowing loopback connections.
> + */
> +#define EVTCHNOP_bind_interdomain 0
> +struct evtchn_bind_interdomain {
> + /* IN parameters. */
> + domid_t remote_dom;
> + evtchn_port_t remote_port;
> + /* OUT parameters. */
> + evtchn_port_t local_port;
> +};
> +
> +/*
> + * EVTCHNOP_bind_virq: Bind a local event channel to VIRQ <irq> on
> specified
> + * vcpu.
> + * NOTES:
> + * 1. A virtual IRQ may be bound to at most one event channel per vcpu.
> + * 2. The allocated event channel is bound to the specified vcpu. The
> binding
> + * may not be changed.
> + */
> +#define EVTCHNOP_bind_virq 1
> +struct evtchn_bind_virq {
> + /* IN parameters. */
> + u32 virq;
> + u32 vcpu;
> + /* OUT parameters. */
> + evtchn_port_t port;
> +};
> +
> +/*
> + * EVTCHNOP_bind_pirq: Bind a local event channel to PIRQ <irq>.
> + * NOTES:
> + * 1. A physical IRQ may be bound to at most one event channel per
> domain.
> + * 2. Only a sufficiently-privileged domain may bind to a physical IRQ.
> + */
> +#define EVTCHNOP_bind_pirq 2
> +struct evtchn_bind_pirq {
> + /* IN parameters. */
> + u32 pirq;
> +#define BIND_PIRQ__WILL_SHARE 1
> + u32 flags; /* BIND_PIRQ__* */
> + /* OUT parameters. */
> + evtchn_port_t port;
> +};
> +
> +/*
> + * EVTCHNOP_bind_ipi: Bind a local event channel to receive events.
> + * NOTES:
> + * 1. The allocated event channel is bound to the specified vcpu. The
> binding
> + * may not be changed.
> + */
> +#define EVTCHNOP_bind_ipi 7
> +struct evtchn_bind_ipi {
> + u32 vcpu;
> + /* OUT parameters. */
> + evtchn_port_t port;
> +};
> +
> +/*
> + * EVTCHNOP_close: Close a local event channel <port>. If the channel is
> + * interdomain then the remote end is placed in the unbound state
> + * (EVTCHNSTAT_unbound), awaiting a new connection.
> + */
> +#define EVTCHNOP_close 3
> +struct evtchn_close {
> + /* IN parameters. */
> + evtchn_port_t port;
> +};
> +
> +/*
> + * EVTCHNOP_send: Send an event to the remote end of the channel whose
> local
> + * endpoint is <port>.
> + */
> +#define EVTCHNOP_send 4
> +struct evtchn_send {
> + /* IN parameters. */
> + evtchn_port_t port;
> +};
> +
> +/*
> + * EVTCHNOP_status: Get the current status of the communication channel
> which
> + * has an endpoint at <dom, port>.
> + * NOTES:
> + * 1. <dom> may be specified as DOMID_SELF.
> + * 2. Only a sufficiently-privileged domain may obtain the status of an
> event
> + * channel for which <dom> is not DOMID_SELF.
> + */
> +#define EVTCHNOP_status 5
> +struct evtchn_status {
> + /* IN parameters */
> + domid_t dom;
> + evtchn_port_t port;
> + /* OUT parameters */
> +#define EVTCHNSTAT_closed 0 /* Channel is not in use. */
> +#define EVTCHNSTAT_unbound 1 /* Channel is waiting interdom
> connection.*/
> +#define EVTCHNSTAT_interdomain 2 /* Channel is connected to remote
> domain. */
> +#define EVTCHNSTAT_pirq 3 /* Channel is bound to a phys IRQ
> line.
> */
> +#define EVTCHNSTAT_virq 4 /* Channel is bound to a virtual IRQ
> line
> */
> +#define EVTCHNSTAT_ipi 5 /* Channel is bound to a virtual IPI
> line
> */
> + u32 status;
> + u32 vcpu; /* VCPU to which this channel is bound. */
> + union {
> + struct {
> + domid_t dom;
> + } unbound; /* EVTCHNSTAT_unbound */
> + struct {
> + domid_t dom;
> + evtchn_port_t port;
> + } interdomain; /* EVTCHNSTAT_interdomain */
> + u32 pirq; /* EVTCHNSTAT_pirq */
> + u32 virq; /* EVTCHNSTAT_virq */
> + } u;
> +};
> +
> +/*
> + * EVTCHNOP_bind_vcpu: Specify which vcpu a channel should notify when
> an
> + * event is pending.
> + * NOTES:
> + * 1. IPI- and VIRQ-bound channels always notify the vcpu that initialised
> + * the binding. This binding cannot be changed.
> + * 2. All other channels notify vcpu0 by default. This default is set when
> + * the channel is allocated (a port that is freed and subsequently reused
> + * has its binding reset to vcpu0).
> + */
> +#define EVTCHNOP_bind_vcpu 8
> +struct evtchn_bind_vcpu {
> + /* IN parameters. */
> + evtchn_port_t port;
> + u32 vcpu;
> +};
> +
> +/*
> + * EVTCHNOP_unmask: Unmask the specified local event-channel port and
> deliver
> + * a notification to the appropriate VCPU if an event is pending.
> + */
> +#define EVTCHNOP_unmask 9
> +struct evtchn_unmask {
> + /* IN parameters. */
> + evtchn_port_t port;
> +};
> +
> +/*
> + * EVTCHNOP_reset: Close all event channels associated with specified
> domain.
> + * NOTES:
> + * 1. <dom> may be specified as DOMID_SELF.
> + * 2. Only a sufficiently-privileged domain may specify other than
> DOMID_SELF.
> + */
> +#define EVTCHNOP_reset 10
> +struct evtchn_reset {
> + /* IN parameters. */
> + domid_t dom;
> +};
> +
> +typedef struct evtchn_reset evtchn_reset_t;
> +
> +/*
> + * EVTCHNOP_init_control: initialize the control block for the FIFO ABI.
> + */
> +#define EVTCHNOP_init_control 11
> +struct evtchn_init_control {
> + /* IN parameters. */
> + u64 control_gfn;
> + u32 offset;
> + u32 vcpu;
> + /* OUT parameters. */
> + u8 link_bits;
> + u8 _pad[7];
> +};
> +
> +/*
> + * EVTCHNOP_expand_array: add an additional page to the event array.
> + */
> +#define EVTCHNOP_expand_array 12
> +struct evtchn_expand_array {
> + /* IN parameters. */
> + u64 array_gfn;
> +};
> +
> +/*
> + * EVTCHNOP_set_priority: set the priority for an event channel.
> + */
> +#define EVTCHNOP_set_priority 13
> +struct evtchn_set_priority {
> + /* IN parameters. */
> + evtchn_port_t port;
> + u32 priority;
> +};
> +
> +struct evtchn_op {
> + u32 cmd; /* EVTCHNOP_* */
> + union {
> + struct evtchn_alloc_unbound alloc_unbound;
> + struct evtchn_bind_interdomain bind_interdomain;
> + struct evtchn_bind_virq bind_virq;
> + struct evtchn_bind_pirq bind_pirq;
> + struct evtchn_bind_ipi bind_ipi;
> + struct evtchn_close close;
> + struct evtchn_send send;
> + struct evtchn_status status;
> + struct evtchn_bind_vcpu bind_vcpu;
> + struct evtchn_unmask unmask;
> + } u;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(evtchn_op);
> +
> +/*
> + * 2-level ABI
> + */
> +
> +#define EVTCHN_2L_NR_CHANNELS (sizeof(xen_ulong_t) *
> sizeof(xen_ulong_t) * 64)
> +
> +/*
> + * FIFO ABI
> + */
> +
> +/* Events may have priorities from 0 (highest) to 15 (lowest). */
> +#define EVTCHN_FIFO_PRIORITY_MAX 0
> +#define EVTCHN_FIFO_PRIORITY_DEFAULT 7
> +#define EVTCHN_FIFO_PRIORITY_MIN 15
> +
> +#define EVTCHN_FIFO_MAX_QUEUES (EVTCHN_FIFO_PRIORITY_MIN + 1)
> +
> +typedef u32 event_word_t;
> +
> +#define EVTCHN_FIFO_PENDING 31
> +#define EVTCHN_FIFO_MASKED 30
> +#define EVTCHN_FIFO_LINKED 29
> +#define EVTCHN_FIFO_BUSY 28
> +
> +#define EVTCHN_FIFO_LINK_BITS 17
> +#define EVTCHN_FIFO_LINK_MASK ((1 << EVTCHN_FIFO_LINK_BITS) - 1)
> +
> +#define EVTCHN_FIFO_NR_CHANNELS (1 << EVTCHN_FIFO_LINK_BITS)
> +
> +struct evtchn_fifo_control_block {
> + u32 ready;
> + u32 _rsvd;
> + event_word_t head[EVTCHN_FIFO_MAX_QUEUES];
> +};
> +
> +#endif /* __XEN_PUBLIC_EVENT_CHANNEL_H__ */
> diff --git a/include/xen/interface/grant_table.h
> b/include/xen/interface/grant_table.h
> new file mode 100644
> index 0000000000..197a0d0d58
> --- /dev/null
> +++ b/include/xen/interface/grant_table.h
> @@ -0,0 +1,582 @@
> +/************************************************************
> ******************
> + * grant_table.h
> + *
> + * Interface for granting foreign access to page frames, and receiving
> + * page-ownership transfers.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (c) 2004, K A Fraser
> + */
> +
> +#ifndef __XEN_PUBLIC_GRANT_TABLE_H__
> +#define __XEN_PUBLIC_GRANT_TABLE_H__
> +
> +#include <xen/interface/xen.h>
> +
> +/***********************************
> + * GRANT TABLE REPRESENTATION
> + */
> +
> +/* Some rough guidelines on accessing and updating grant-table entries
> + * in a concurrency-safe manner. For more information, Linux contains a
> + * reference implementation for guest OSes (arch/xen/kernel/grant_table.c).
> + *
> + * NB. WMB is a no-op on current-generation x86 processors. However, a
> + * compiler barrier will still be required.
> + *
> + * Introducing a valid entry into the grant table:
> + * 1. Write ent->domid.
> + * 2. Write ent->frame:
> + * GTF_permit_access: Frame to which access is permitted.
> + * GTF_accept_transfer: Pseudo-phys frame slot being filled by new
> + * frame, or zero if none.
> + * 3. Write memory barrier (WMB).
> + * 4. Write ent->flags, inc. valid type.
> + *
> + * Invalidating an unused GTF_permit_access entry:
> + * 1. flags = ent->flags.
> + * 2. Observe that !(flags & (GTF_reading|GTF_writing)).
> + * 3. Check result of SMP-safe CMPXCHG(&ent->flags, flags, 0).
> + * NB. No need for WMB as reuse of entry is control-dependent on success
> of
> + * step 3, and all architectures guarantee ordering of ctrl-dep writes.
> + *
> + * Invalidating an in-use GTF_permit_access entry:
> + * This cannot be done directly. Request assistance from the domain
> controller
> + * which can set a timeout on the use of a grant entry and take necessary
> + * action. (NB. This is not yet implemented!).
> + *
> + * Invalidating an unused GTF_accept_transfer entry:
> + * 1. flags = ent->flags.
> + * 2. Observe that !(flags & GTF_transfer_committed). [*]
> + * 3. Check result of SMP-safe CMPXCHG(&ent->flags, flags, 0).
> + * NB. No need for WMB as reuse of entry is control-dependent on success
> of
> + * step 3, and all architectures guarantee ordering of ctrl-dep writes.
> + * [*] If GTF_transfer_committed is set then the grant entry is 'committed'.
> + * The guest must /not/ modify the grant entry until the address of
> the
> + * transferred frame is written. It is safe for the guest to spin
> waiting
> + * for this to occur (detect by observing GTF_transfer_completed in
> + * ent->flags).
> + *
> + * Invalidating a committed GTF_accept_transfer entry:
> + * 1. Wait for (ent->flags & GTF_transfer_completed).
> + *
> + * Changing a GTF_permit_access from writable to read-only:
> + * Use SMP-safe CMPXCHG to set GTF_readonly, while
> checking !GTF_writing.
> + *
> + * Changing a GTF_permit_access from read-only to writable:
> + * Use SMP-safe bit-setting instruction.
> + */
> +
> +/*
> + * Reference to a grant entry in a specified domain's grant table.
> + */
> +typedef u32 grant_ref_t;
> +
> +/*
> + * A grant table comprises a packed array of grant entries in one or more
> + * page frames shared between Xen and a guest.
> + * [XEN]: This field is written by Xen and read by the sharing guest.
> + * [GST]: This field is written by the guest and read by Xen.
> + */
> +
> +/*
> + * Version 1 of the grant table entry structure is maintained purely
> + * for backwards compatibility. New guests should use version 2.
> + */
> +struct grant_entry_v1 {
> + /* GTF_xxx: various type and flag information. [XEN,GST] */
> + u16 flags;
> + /* The domain being granted foreign privileges. [GST] */
> + domid_t domid;
> + /*
> + * GTF_permit_access: Frame that @domid is allowed to map and
> access. [GST]
> + * GTF_accept_transfer: Frame whose ownership transferred by
> @domid. [XEN]
> + */
> + u32 frame;
> +};
> +
> +/*
> + * Type of grant entry.
> + * GTF_invalid: This grant entry grants no privileges.
> + * GTF_permit_access: Allow @domid to map/access @frame.
> + * GTF_accept_transfer: Allow @domid to transfer ownership of one page
> frame
> + * to this guest. Xen writes the page number to
> @frame.
> + * GTF_transitive: Allow @domid to transitively access a subrange of
> + * @trans_grant in @trans_domid. No mappings are
> allowed.
> + */
> +#define GTF_invalid (0U << 0)
> +#define GTF_permit_access (1U << 0)
> +#define GTF_accept_transfer (2U << 0)
> +#define GTF_transitive (3U << 0)
> +#define GTF_type_mask (3U << 0)
> +
> +/*
> + * Subflags for GTF_permit_access.
> + * GTF_readonly: Restrict @domid to read-only mappings and accesses.
> [GST]
> + * GTF_reading: Grant entry is currently mapped for reading by @domid.
> [XEN]
> + * GTF_writing: Grant entry is currently mapped for writing by @domid.
> [XEN]
> + * GTF_sub_page: Grant access to only a subrange of the page. @domid
> + * will only be allowed to copy from the grant, and not
> + * map it. [GST]
> + */
> +#define _GTF_readonly (2)
> +#define GTF_readonly (1U << _GTF_readonly)
> +#define _GTF_reading (3)
> +#define GTF_reading (1U << _GTF_reading)
> +#define _GTF_writing (4)
> +#define GTF_writing (1U << _GTF_writing)
> +#define _GTF_sub_page (8)
> +#define GTF_sub_page (1U << _GTF_sub_page)
> +
> +/*
> + * Subflags for GTF_accept_transfer:
> + * GTF_transfer_committed: Xen sets this flag to indicate that it is
> committed
> + * to transferring ownership of a page frame. When a guest sees this
> flag
> + * it must /not/ modify the grant entry until GTF_transfer_completed
> is
> + * set by Xen.
> + * GTF_transfer_completed: It is safe for the guest to spin-wait on this
> flag
> + * after reading GTF_transfer_committed. Xen will always write the
> frame
> + * address, followed by ORing this flag, in a timely manner.
> + */
> +#define _GTF_transfer_committed (2)
> +#define GTF_transfer_committed (1U << _GTF_transfer_committed)
> +#define _GTF_transfer_completed (3)
> +#define GTF_transfer_completed (1U << _GTF_transfer_completed)
> +
> +/*
> + * Version 2 grant table entries. These fulfil the same role as
> + * version 1 entries, but can represent more complicated operations.
> + * Any given domain will have either a version 1 or a version 2 table,
> + * and every entry in the table will be the same version.
> + *
> + * The interface by which domains use grant references does not depend
> + * on the grant table version in use by the other domain.
> + */
> +
> +/*
> + * Version 1 and version 2 grant entries share a common prefix. The
> + * fields of the prefix are documented as part of struct
> + * grant_entry_v1.
> + */
> +struct grant_entry_header {
> + u16 flags;
> + domid_t domid;
> +};
> +
> +/*
> + * Version 2 of the grant entry structure, here is a union because three
> + * different types are suppotted: full_page, sub_page and transitive.
> + */
> +union grant_entry_v2 {
> + struct grant_entry_header hdr;
> +
> + /*
> + * This member is used for V1-style full page grants, where either:
> + *
> + * -- hdr.type is GTF_accept_transfer, or
> + * -- hdr.type is GTF_permit_access and GTF_sub_page is not set.
> + *
> + * In that case, the frame field has the same semantics as the
> + * field of the same name in the V1 entry structure.
> + */
> + struct {
> + struct grant_entry_header hdr;
> + u32 pad0;
> + u64 frame;
> + } full_page;
> +
> + /*
> + * If the grant type is GTF_grant_access and GTF_sub_page is set,
> + * @domid is allowed to access bytes [@page_off,@page_off+@length)
> + * in frame @frame.
> + */
> + struct {
> + struct grant_entry_header hdr;
> + u16 page_off;
> + u16 length;
> + u64 frame;
> + } sub_page;
> +
> + /*
> + * If the grant is GTF_transitive, @domid is allowed to use the
> + * grant @gref in domain @trans_domid, as if it was the local
> + * domain. Obviously, the transitive access must be compatible
> + * with the original grant.
> + */
> + struct {
> + struct grant_entry_header hdr;
> + domid_t trans_domid;
> + u16 pad0;
> + grant_ref_t gref;
> + } transitive;
> +
> + u32 __spacer[4]; /* Pad to a power of two */
> +};
> +
> +typedef u16 grant_status_t;
> +
> +/***********************************
> + * GRANT TABLE QUERIES AND USES
> + */
> +
> +/*
> + * Handle to track a mapping created via a grant reference.
> + */
> +typedef u32 grant_handle_t;
> +
> +/*
> + * GNTTABOP_map_grant_ref: Map the grant entry (<dom>,<ref>) for access
> + * by devices and/or host CPUs. If successful, <handle> is a tracking number
> + * that must be presented later to destroy the mapping(s). On error,
> <handle>
> + * is a negative status code.
> + * NOTES:
> + * 1. If GNTMAP_device_map is specified then <dev_bus_addr> is the
> address
> + * via which I/O devices may access the granted frame.
> + * 2. If GNTMAP_host_map is specified then a mapping will be added at
> + * either a host virtual address in the current address space, or at
> + * a PTE at the specified machine address. The type of mapping to
> + * perform is selected through the GNTMAP_contains_pte flag, and the
> + * address is specified in <host_addr>.
> + * 3. Mappings should only be destroyed via GNTTABOP_unmap_grant_ref.
> If a
> + * host mapping is destroyed by other means then it is *NOT*
> guaranteed
> + * to be accounted to the correct grant reference!
> + */
> +#define GNTTABOP_map_grant_ref 0
> +struct gnttab_map_grant_ref {
> + /* IN parameters. */
> + u64 host_addr;
> + u32 flags; /* GNTMAP_* */
> + grant_ref_t ref;
> + domid_t dom;
> + /* OUT parameters. */
> + s16 status; /* GNTST_* */
> + grant_handle_t handle;
> + u64 dev_bus_addr;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_map_grant_ref);
> +
> +/*
> + * GNTTABOP_unmap_grant_ref: Destroy one or more grant-reference
> mappings
> + * tracked by <handle>. If <host_addr> or <dev_bus_addr> is zero, that
> + * field is ignored. If non-zero, they must refer to a device/host mapping
> + * that is tracked by <handle>
> + * NOTES:
> + * 1. The call may fail in an undefined manner if either mapping is not
> + * tracked by <handle>.
> + * 3. After executing a batch of unmaps, it is guaranteed that no stale
> + * mappings will remain in the device or host TLBs.
> + */
> +#define GNTTABOP_unmap_grant_ref 1
> +struct gnttab_unmap_grant_ref {
> + /* IN parameters. */
> + u64 host_addr;
> + u64 dev_bus_addr;
> + grant_handle_t handle;
> + /* OUT parameters. */
> + s16 status; /* GNTST_* */
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_unmap_grant_ref);
> +
> +/*
> + * GNTTABOP_setup_table: Set up a grant table for <dom> comprising at
> least
> + * <nr_frames> pages. The frame addresses are written to the <frame_list>.
> + * Only <nr_frames> addresses are written, even if the table is larger.
> + * NOTES:
> + * 1. <dom> may be specified as DOMID_SELF.
> + * 2. Only a sufficiently-privileged domain may specify <dom> !=
> DOMID_SELF.
> + * 3. Xen may not support more than a single grant-table page per domain.
> + */
> +#define GNTTABOP_setup_table 2
> +struct gnttab_setup_table {
> + /* IN parameters. */
> + domid_t dom;
> + u32 nr_frames;
> + /* OUT parameters. */
> + s16 status; /* GNTST_* */
> +
> + GUEST_HANDLE(xen_pfn_t)frame_list;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_setup_table);
> +
> +/*
> + * GNTTABOP_dump_table: Dump the contents of the grant table to the
> + * xen console. Debugging use only.
> + */
> +#define GNTTABOP_dump_table 3
> +struct gnttab_dump_table {
> + /* IN parameters. */
> + domid_t dom;
> + /* OUT parameters. */
> + s16 status; /* GNTST_* */
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_dump_table);
> +
> +/*
> + * GNTTABOP_transfer_grant_ref: Transfer <frame> to a foreign domain. The
> + * foreign domain has previously registered its interest in the transfer via
> + * <domid, ref>.
> + *
> + * Note that, even if the transfer fails, the specified page no longer
> belongs
> + * to the calling domain *unless* the error is GNTST_bad_page.
> + */
> +#define GNTTABOP_transfer 4
> +struct gnttab_transfer {
> + /* IN parameters. */
> + xen_pfn_t mfn;
> + domid_t domid;
> + grant_ref_t ref;
> + /* OUT parameters. */
> + s16 status;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_transfer);
> +
> +/*
> + * GNTTABOP_copy: Hypervisor based copy
> + * source and destinations can be eithers MFNs or, for foreign domains,
> + * grant references. the foreign domain has to grant read/write access
> + * in its grant table.
> + *
> + * The flags specify what type source and destinations are (either MFN
> + * or grant reference).
> + *
> + * Note that this can also be used to copy data between two domains
> + * via a third party if the source and destination domains had previously
> + * grant appropriate access to their pages to the third party.
> + *
> + * source_offset specifies an offset in the source frame, dest_offset
> + * the offset in the target frame and len specifies the number of
> + * bytes to be copied.
> + */
> +
> +#define _GNTCOPY_source_gref (0)
> +#define GNTCOPY_source_gref (1 << _GNTCOPY_source_gref)
> +#define _GNTCOPY_dest_gref (1)
> +#define GNTCOPY_dest_gref (1 << _GNTCOPY_dest_gref)
> +
> +#define GNTTABOP_copy 5
> +struct gnttab_copy {
> + /* IN parameters. */
> + struct {
> + union {
> + grant_ref_t ref;
> + xen_pfn_t gmfn;
> + } u;
> + domid_t domid;
> + u16 offset;
> + } source, dest;
> + u16 len;
> + u16 flags; /* GNTCOPY_* */
> + /* OUT parameters. */
> + s16 status;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_copy);
> +
> +/*
> + * GNTTABOP_query_size: Query the current and maximum sizes of the
> shared
> + * grant table.
> + * NOTES:
> + * 1. <dom> may be specified as DOMID_SELF.
> + * 2. Only a sufficiently-privileged domain may specify <dom> !=
> DOMID_SELF.
> + */
> +#define GNTTABOP_query_size 6
> +struct gnttab_query_size {
> + /* IN parameters. */
> + domid_t dom;
> + /* OUT parameters. */
> + u32 nr_frames;
> + u32 max_nr_frames;
> + s16 status; /* GNTST_* */
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_query_size);
> +
> +/*
> + * GNTTABOP_unmap_and_replace: Destroy one or more grant-reference
> mappings
> + * tracked by <handle> but atomically replace the page table entry with one
> + * pointing to the machine address under <new_addr>. <new_addr> will
> be
> + * redirected to the null entry.
> + * NOTES:
> + * 1. The call may fail in an undefined manner if either mapping is not
> + * tracked by <handle>.
> + * 2. After executing a batch of unmaps, it is guaranteed that no stale
> + * mappings will remain in the device or host TLBs.
> + */
> +#define GNTTABOP_unmap_and_replace 7
> +struct gnttab_unmap_and_replace {
> + /* IN parameters. */
> + u64 host_addr;
> + u64 new_addr;
> + grant_handle_t handle;
> + /* OUT parameters. */
> + s16 status; /* GNTST_* */
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_unmap_and_replace);
> +
> +/*
> + * GNTTABOP_set_version: Request a particular version of the grant
> + * table shared table structure. This operation can only be performed
> + * once in any given domain. It must be performed before any grants
> + * are activated; otherwise, the domain will be stuck with version 1.
> + * The only defined versions are 1 and 2.
> + */
> +#define GNTTABOP_set_version 8
> +struct gnttab_set_version {
> + /* IN parameters */
> + u32 version;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_set_version);
> +
> +/*
> + * GNTTABOP_get_status_frames: Get the list of frames used to store grant
> + * status for <dom>. In grant format version 2, the status is separated
> + * from the other shared grant fields to allow more efficient synchronization
> + * using barriers instead of atomic cmpexch operations.
> + * <nr_frames> specify the size of vector <frame_list>.
> + * The frame addresses are returned in the <frame_list>.
> + * Only <nr_frames> addresses are returned, even if the table is larger.
> + * NOTES:
> + * 1. <dom> may be specified as DOMID_SELF.
> + * 2. Only a sufficiently-privileged domain may specify <dom> !=
> DOMID_SELF.
> + */
> +#define GNTTABOP_get_status_frames 9
> +struct gnttab_get_status_frames {
> + /* IN parameters. */
> + u32 nr_frames;
> + domid_t dom;
> + /* OUT parameters. */
> + s16 status; /* GNTST_* */
> +
> + GUEST_HANDLE(u64)frame_list;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_status_frames);
> +
> +/*
> + * GNTTABOP_get_version: Get the grant table version which is in
> + * effect for domain <dom>.
> + */
> +#define GNTTABOP_get_version 10
> +struct gnttab_get_version {
> + /* IN parameters */
> + domid_t dom;
> + u16 pad;
> + /* OUT parameters */
> + u32 version;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_version);
> +
> +/*
> + * Issue one or more cache maintenance operations on a portion of a
> + * page granted to the calling domain by a foreign domain.
> + */
> +#define GNTTABOP_cache_flush 12
> +struct gnttab_cache_flush {
> + union {
> + u64 dev_bus_addr;
> + grant_ref_t ref;
> + } a;
> + u16 offset; /* offset from start of grant */
> + u16 length; /* size within the grant */
> +#define GNTTAB_CACHE_CLEAN (1 << 0)
> +#define GNTTAB_CACHE_INVAL (1 << 1)
> +#define GNTTAB_CACHE_SOURCE_GREF (1 << 31)
> + u32 op;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(gnttab_cache_flush);
> +
> +/*
> + * Bitfield values for update_pin_status.flags.
> + */
> + /* Map the grant entry for access by I/O devices. */
> +#define _GNTMAP_device_map (0)
> +#define GNTMAP_device_map (1 << _GNTMAP_device_map)
> +/* Map the grant entry for access by host CPUs. */
> +#define _GNTMAP_host_map (1)
> +#define GNTMAP_host_map (1 << _GNTMAP_host_map)
> +/* Accesses to the granted frame will be restricted to read-only access. */
> +#define _GNTMAP_readonly (2)
> +#define GNTMAP_readonly (1 << _GNTMAP_readonly)
> +/*
> + * GNTMAP_host_map subflag:
> + * 0 => The host mapping is usable only by the guest OS.
> + * 1 => The host mapping is usable by guest OS + current application.
> + */
> +#define _GNTMAP_application_map (3)
> +#define GNTMAP_application_map (1 << _GNTMAP_application_map)
> +
> +/*
> + * GNTMAP_contains_pte subflag:
> + * 0 => This map request contains a host virtual address.
> + * 1 => This map request contains the machine addess of the PTE to
> update.
> + */
> +#define _GNTMAP_contains_pte (4)
> +#define GNTMAP_contains_pte (1 << _GNTMAP_contains_pte)
> +
> +/*
> + * Bits to be placed in guest kernel available PTE bits (architecture
> + * dependent; only supported when XENFEAT_gnttab_map_avail_bits is set).
> + */
> +#define _GNTMAP_guest_avail0 (16)
> +#define GNTMAP_guest_avail_mask ((u32)~0 << _GNTMAP_guest_avail0)
> +
> +/*
> + * Values for error status returns. All errors are -ve.
> + */
> +#define GNTST_okay (0) /* Normal return.
> */
> +#define GNTST_general_error (-1) /* General undefined error.
> */
> +#define GNTST_bad_domain (-2) /* Unrecognsed domain id.
> */
> +#define GNTST_bad_gntref (-3) /* Unrecognised or inappropriate
> gntref. */
> +#define GNTST_bad_handle (-4) /* Unrecognised or inappropriate
> handle. */
> +#define GNTST_bad_virt_addr (-5) /* Inappropriate virtual address to
> map. */
> +#define GNTST_bad_dev_addr (-6) /* Inappropriate device address to
> unmap.*/
> +#define GNTST_no_device_space (-7) /* Out of space in I/O MMU.
> */
> +#define GNTST_permission_denied (-8) /* Not enough privilege for operation.
> */
> +#define GNTST_bad_page (-9) /* Specified page was invalid for op.
> */
> +#define GNTST_bad_copy_arg (-10) /* copy arguments cross page
> boundary. */
> +#define GNTST_address_too_big (-11) /* transfer page address too large.
> */
> +#define GNTST_eagain (-12) /* Operation not done; try again.
> */
> +
> +#define GNTTABOP_error_msgs { \
> + "okay", \
> + "undefined error", \
> + "unrecognised domain id", \
> + "invalid grant reference", \
> + "invalid mapping handle", \
> + "invalid virtual address", \
> + "invalid device address", \
> + "no spare translation slot in the I/O MMU", \
> + "permission denied", \
> + "bad page", \
> + "copy arguments cross page boundary", \
> + "page address size too large", \
> + "operation not done; try again" \
> +}
> +
> +#endif /* __XEN_PUBLIC_GRANT_TABLE_H__ */
> diff --git a/include/xen/interface/hvm/hvm_op.h
> b/include/xen/interface/hvm/hvm_op.h
> new file mode 100644
> index 0000000000..1c53cad729
> --- /dev/null
> +++ b/include/xen/interface/hvm/hvm_op.h
> @@ -0,0 +1,69 @@
> +/*
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + */
> +
> +#ifndef __XEN_PUBLIC_HVM_HVM_OP_H__
> +#define __XEN_PUBLIC_HVM_HVM_OP_H__
> +
> +/* Get/set subcommands: the second argument of the hypercall is a
> + * pointer to a xen_hvm_param struct.
> + */
> +#define HVMOP_set_param 0
> +#define HVMOP_get_param 1
> +struct xen_hvm_param {
> + domid_t domid; /* IN */
> + u32 index; /* IN */
> + u64 value; /* IN/OUT */
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_hvm_param);
> +
> +/* Hint from PV drivers for pagetable destruction. */
> +#define HVMOP_pagetable_dying 9
> +struct xen_hvm_pagetable_dying {
> + /* Domain with a pagetable about to be destroyed. */
> + domid_t domid;
> + /* guest physical address of the toplevel pagetable dying */
> + aligned_u64 gpa;
> +};
> +
> +typedef struct xen_hvm_pagetable_dying xen_hvm_pagetable_dying_t;
> +DEFINE_GUEST_HANDLE_STRUCT(xen_hvm_pagetable_dying_t);
> +
> +enum hvmmem_type_t {
> + HVMMEM_ram_rw, /* Normal read/write guest RAM */
> + HVMMEM_ram_ro, /* Read-only; writes are discarded */
> + HVMMEM_mmio_dm, /* Reads and write go to the device
> model */
> +};
> +
> +#define HVMOP_get_mem_type 15
> +/* Return hvmmem_type_t for the specified pfn. */
> +struct xen_hvm_get_mem_type {
> + /* Domain to be queried. */
> + domid_t domid;
> + /* OUT variable. */
> + u16 mem_type;
> + u16 pad[2]; /* align next field on 8-byte boundary */
> + /* IN variable. */
> + u64 pfn;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_hvm_get_mem_type);
> +
> +#endif /* __XEN_PUBLIC_HVM_HVM_OP_H__ */
> diff --git a/include/xen/interface/hvm/params.h
> b/include/xen/interface/hvm/params.h
> new file mode 100644
> index 0000000000..4d61fc58d9
> --- /dev/null
> +++ b/include/xen/interface/hvm/params.h
> @@ -0,0 +1,127 @@
> +/*
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + */
> +
> +#ifndef __XEN_PUBLIC_HVM_PARAMS_H__
> +#define __XEN_PUBLIC_HVM_PARAMS_H__
> +
> +#include <xen/interface/hvm/hvm_op.h>
> +
> +/*
> + * Parameter space for HVMOP_{set,get}_param.
> + */
> +
> +#define HVM_PARAM_CALLBACK_IRQ 0
> +/*
> + * How should CPU0 event-channel notifications be delivered?
> + *
> + * If val == 0 then CPU0 event-channel notifications are not delivered.
> + * If val != 0, val[63:56] encodes the type, as follows:
> + */
> +
> +#define HVM_PARAM_CALLBACK_TYPE_GSI 0
> +/*
> + * val[55:0] is a delivery GSI. GSI 0 cannot be used, as it aliases val ==
> 0,
> + * and disables all notifications.
> + */
> +
> +#define HVM_PARAM_CALLBACK_TYPE_PCI_INTX 1
> +/*
> + * val[55:0] is a delivery PCI INTx line:
> + * Domain = val[47:32], Bus = val[31:16] DevFn = val[15:8], IntX = val[1:0]
> + */
> +
> +#if defined(__i386__) || defined(__x86_64__)
> +#define HVM_PARAM_CALLBACK_TYPE_VECTOR 2
> +/*
> + * val[7:0] is a vector number. Check for XENFEAT_hvm_callback_vector to
> know
> + * if this delivery method is available.
> + */
> +#elif defined(__arm__) || defined(__aarch64__)
> +#define HVM_PARAM_CALLBACK_TYPE_PPI 2
> +/*
> + * val[55:16] needs to be zero.
> + * val[15:8] is interrupt flag of the PPI used by event-channel:
> + * bit 8: the PPI is edge(1) or level(0) triggered
> + * bit 9: the PPI is active low(1) or high(0)
> + * val[7:0] is a PPI number used by event-channel.
> + * This is only used by ARM/ARM64 and masking/eoi the interrupt associated
> to
> + * the notification is handled by the interrupt controller.
> + */
> +#endif
> +
> +#define HVM_PARAM_STORE_PFN 1
> +#define HVM_PARAM_STORE_EVTCHN 2
> +
> +#define HVM_PARAM_PAE_ENABLED 4
> +
> +#define HVM_PARAM_IOREQ_PFN 5
> +
> +#define HVM_PARAM_BUFIOREQ_PFN 6
> +
> +/*
> + * Set mode for virtual timers (currently x86 only):
> + * delay_for_missed_ticks (default):
> + * Do not advance a vcpu's time beyond the correct delivery time for
> + * interrupts that have been missed due to preemption. Deliver missed
> + * interrupts when the vcpu is rescheduled and advance the vcpu's virtual
> + * time stepwise for each one.
> + * no_delay_for_missed_ticks:
> + * As above, missed interrupts are delivered, but guest time always tracks
> + * wallclock (i.e., real) time while doing so.
> + * no_missed_ticks_pending:
> + * No missed interrupts are held pending. Instead, to ensure ticks are
> + * delivered at some non-zero rate, if we detect missed ticks then the
> + * internal tick alarm is not disabled if the VCPU is preempted during the
> + * next tick period.
> + * one_missed_tick_pending:
> + * Missed interrupts are collapsed together and delivered as one 'late
> tick'.
> + * Guest time always tracks wallclock (i.e., real) time.
> + */
> +#define HVM_PARAM_TIMER_MODE 10
> +#define HVMPTM_delay_for_missed_ticks 0
> +#define HVMPTM_no_delay_for_missed_ticks 1
> +#define HVMPTM_no_missed_ticks_pending 2
> +#define HVMPTM_one_missed_tick_pending 3
> +
> +/* Boolean: Enable virtual HPET (high-precision event timer)? (x86-only) */
> +#define HVM_PARAM_HPET_ENABLED 11
> +
> +/* Identity-map page directory used by Intel EPT when CR0.PG=0. */
> +#define HVM_PARAM_IDENT_PT 12
> +
> +/* Device Model domain, defaults to 0. */
> +#define HVM_PARAM_DM_DOMAIN 13
> +
> +/* ACPI S state: currently support S0 and S3 on x86. */
> +#define HVM_PARAM_ACPI_S_STATE 14
> +
> +/* TSS used on Intel when CR0.PE=0. */
> +#define HVM_PARAM_VM86_TSS 15
> +
> +/* Boolean: Enable aligning all periodic vpts to reduce interrupts */
> +#define HVM_PARAM_VPT_ALIGN 16
> +
> +/* Console debug shared memory ring and event channel */
> +#define HVM_PARAM_CONSOLE_PFN 17
> +#define HVM_PARAM_CONSOLE_EVTCHN 18
> +
> +#define HVM_NR_PARAMS 19
> +
> +#endif /* __XEN_PUBLIC_HVM_PARAMS_H__ */
> diff --git a/include/xen/interface/io/blkif.h
> b/include/xen/interface/io/blkif.h
> new file mode 100644
> index 0000000000..7d74c99226
> --- /dev/null
> +++ b/include/xen/interface/io/blkif.h
> @@ -0,0 +1,726 @@
> +/************************************************************
> ******************
> + * blkif.h
> + *
> + * Unified block-device I/O interface for Xen guest OSes.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (c) 2003-2004, Keir Fraser
> + * Copyright (c) 2012, Spectra Logic Corporation
> + */
> +
> +#ifndef __XEN_PUBLIC_IO_BLKIF_H__
> +#define __XEN_PUBLIC_IO_BLKIF_H__
> +
> +#include "ring.h"
> +#include "../grant_table.h"
> +
> +/*
> + * Front->back notifications: When enqueuing a new request, sending a
> + * notification can be made conditional on req_event (i.e., the generic
> + * hold-off mechanism provided by the ring macros). Backends must set
> + * req_event appropriately (e.g., using
> RING_FINAL_CHECK_FOR_REQUESTS()).
> + *
> + * Back->front notifications: When enqueuing a new response, sending a
> + * notification can be made conditional on rsp_event (i.e., the generic
> + * hold-off mechanism provided by the ring macros). Frontends must set
> + * rsp_event appropriately (e.g., using
> RING_FINAL_CHECK_FOR_RESPONSES()).
> + */
> +
> +#ifndef blkif_vdev_t
> +#define blkif_vdev_t u16
> +#endif
> +#define blkif_sector_t u64
> +
> +/*
> + * Feature and Parameter Negotiation
> + * =================================
> + * The two halves of a Xen block driver utilize nodes within the XenStore to
> + * communicate capabilities and to negotiate operating parameters. This
> + * section enumerates these nodes which reside in the respective front and
> + * backend portions of the XenStore, following the XenBus convention.
> + *
> + * All data in the XenStore is stored as strings. Nodes specifying numeric
> + * values are encoded in decimal. Integer value ranges listed below are
> + * expressed as fixed sized integer types capable of storing the conversion
> + * of a properly formated node string, without loss of information.
> + *
> + * Any specified default value is in effect if the corresponding XenBus node
> + * is not present in the XenStore.
> + *
> + * XenStore nodes in sections marked "PRIVATE" are solely for use by the
> + * driver side whose XenBus tree contains them.
> + *
> + * XenStore nodes marked "DEPRECATED" in their notes section should only
> be
> + * used to provide interoperability with legacy implementations.
> + *
> + * See the XenBus state transition diagram below for details on when XenBus
> + * nodes must be published and when they can be queried.
> + *
> +
> **************************************************************
> ***************
> + * Backend XenBus Nodes
> +
> **************************************************************
> ***************
> + *
> + *------------------ Backend Device Identification (PRIVATE)
> ------------------
> + *
> + * mode
> + * Values: "r" (read only), "w" (writable)
> + *
> + * The read or write access permissions to the backing store to be
> + * granted to the frontend.
> + *
> + * params
> + * Values: string
> + *
> + * A free formatted string providing sufficient information for the
> + * hotplug script to attach the device and provide a suitable
> + * handler (ie: a block device) for blkback to use.
> + *
> + * physical-device
> + * Values: "MAJOR:MINOR"
> + * Notes: 11
> + *
> + * MAJOR and MINOR are the major number and minor number of
> the
> + * backing device respectively.
> + *
> + * physical-device-path
> + * Values: path string
> + *
> + * A string that contains the absolute path to the disk image. On
> + * NetBSD and Linux this is always a block device, while on FreeBSD
> + * it can be either a block device or a regular file.
> + *
> + * type
> + * Values: "file", "phy", "tap"
> + *
> + * The type of the backing device/object.
> + *
> + *
> + * direct-io-safe
> + * Values: 0/1 (boolean)
> + * Default Value: 0
> + *
> + * The underlying storage is not affected by the direct IO memory
> + * lifetime bug. See:
> + *
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.xe
> n.org%2Farchives%2Fhtml%2Fxen-devel%2F2012-12%2Fmsg01154.html&am
> p;data=02%7C01%7Cpeng.fan%40nxp.com%7Cdd87f4854f514bc096ba08d81
> ddc0812%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C63729217
> 8170181802&sdata=wXiKB5EvbBokB%2BYrOdMDiKDBwSHo8m1ssXFp0K
> RQ0Io%3D&reserved=0
> + *
> + * Therefore this option gives the backend permission to use
> + * O_DIRECT, notwithstanding that bug.
> + *
> + * That is, if this option is enabled, use of O_DIRECT is safe,
> + * in circumstances where we would normally have avoided it as a
> + * workaround for that bug. This option is not relevant for all
> + * backends, and even not necessarily supported for those for
> + * which it is relevant. A backend which knows that it is not
> + * affected by the bug can ignore this option.
> + *
> + * This option doesn't require a backend to use O_DIRECT, so it
> + * should not be used to try to control the caching behaviour.
> + *
> + *--------------------------------- Features
> ---------------------------------
> + *
> + * feature-barrier
> + * Values: 0/1 (boolean)
> + * Default Value: 0
> + *
> + * A value of "1" indicates that the backend can process requests
> + * containing the BLKIF_OP_WRITE_BARRIER request opcode.
> Requests
> + * of this type may still be returned at any time with the
> + * BLKIF_RSP_EOPNOTSUPP result code.
> + *
> + * feature-flush-cache
> + * Values: 0/1 (boolean)
> + * Default Value: 0
> + *
> + * A value of "1" indicates that the backend can process requests
> + * containing the BLKIF_OP_FLUSH_DISKCACHE request opcode.
> Requests
> + * of this type may still be returned at any time with the
> + * BLKIF_RSP_EOPNOTSUPP result code.
> + *
> + * feature-discard
> + * Values: 0/1 (boolean)
> + * Default Value: 0
> + *
> + * A value of "1" indicates that the backend can process requests
> + * containing the BLKIF_OP_DISCARD request opcode. Requests
> + * of this type may still be returned at any time with the
> + * BLKIF_RSP_EOPNOTSUPP result code.
> + *
> + * feature-persistent
> + * Values: 0/1 (boolean)
> + * Default Value: 0
> + * Notes: 7
> + *
> + * A value of "1" indicates that the backend can keep the grants used
> + * by the frontend driver mapped, so the same set of grants should be
> + * used in all transactions. The maximum number of grants the
> backend
> + * can map persistently depends on the implementation, but ideally it
> + * should be RING_SIZE * BLKIF_MAX_SEGMENTS_PER_REQUEST.
> Using this
> + * feature the backend doesn't need to unmap each grant, preventing
> + * costly TLB flushes. The backend driver should only map grants
> + * persistently if the frontend supports it. If a backend driver chooses
> + * to use the persistent protocol when the frontend doesn't support it,
> + * it will probably hit the maximum number of persistently mapped
> grants
> + * (due to the fact that the frontend won't be reusing the same
> grants),
> + * and fall back to non-persistent mode. Backend implementations
> may
> + * shrink or expand the number of persistently mapped grants without
> + * notifying the frontend depending on memory constraints (this might
> + * cause a performance degradation).
> + *
> + * If a backend driver wants to limit the maximum number of
> persistently
> + * mapped grants to a value less than RING_SIZE *
> + * BLKIF_MAX_SEGMENTS_PER_REQUEST a LRU strategy should be
> used to
> + * discard the grants that are less commonly used. Using a LRU in the
> + * backend driver paired with a LIFO queue in the frontend will
> + * allow us to have better performance in this scenario.
> + *
> + *----------------------- Request Transport Parameters
> ------------------------
> + *
> + * max-ring-page-order
> + * Values: <uint32_t>
> + * Default Value: 0
> + * Notes: 1, 3
> + *
> + * The maximum supported size of the request ring buffer in units of
> + * lb(machine pages). (e.g. 0 == 1 page, 1 = 2 pages, 2 == 4 pages,
> + * etc.).
> + *
> + * max-ring-pages
> + * Values: <uint32_t>
> + * Default Value: 1
> + * Notes: DEPRECATED, 2, 3
> + *
> + * The maximum supported size of the request ring buffer in units of
> + * machine pages. The value must be a power of 2.
> + *
> + *------------------------- Backend Device Properties
> -------------------------
> + *
> + * discard-enable
> + * Values: 0/1 (boolean)
> + * Default Value: 1
> + *
> + * This optional property, set by the toolstack, instructs the backend
> + * to offer (or not to offer) discard to the frontend. If the property
> + * is missing the backend should offer discard if the backing storage
> + * actually supports it.
> + *
> + * discard-alignment
> + * Values: <uint32_t>
> + * Default Value: 0
> + * Notes: 4, 5
> + *
> + * The offset, in bytes from the beginning of the virtual block device,
> + * to the first, addressable, discard extent on the underlying device.
> + *
> + * discard-granularity
> + * Values: <uint32_t>
> + * Default Value: <"sector-size">
> + * Notes: 4
> + *
> + * The size, in bytes, of the individually addressable discard extents
> + * of the underlying device.
> + *
> + * discard-secure
> + * Values: 0/1 (boolean)
> + * Default Value: 0
> + * Notes: 10
> + *
> + * A value of "1" indicates that the backend can process
> BLKIF_OP_DISCARD
> + * requests with the BLKIF_DISCARD_SECURE flag set.
> + *
> + * info
> + * Values: <uint32_t> (bitmap)
> + *
> + * A collection of bit flags describing attributes of the backing
> + * device. The VDISK_* macros define the meaning of each bit
> + * location.
> + *
> + * sector-size
> + * Values: <uint32_t>
> + *
> + * The logical block size, in bytes, of the underlying storage. This
> + * must be a power of two with a minimum value of 512.
> + *
> + * NOTE: Because of implementation bugs in some frontends this
> must be
> + * set to 512, unless the frontend advertizes a non-zero value
> + * in its "feature-large-sector-size" xenbus node. (See below).
> + *
> + * physical-sector-size
> + * Values: <uint32_t>
> + * Default Value: <"sector-size">
> + *
> + * The physical block size, in bytes, of the backend storage. This
> + * must be an integer multiple of "sector-size".
> + *
> + * sectors
> + * Values: <u64>
> + *
> + * The size of the backend device, expressed in units of "sector-size".
> + * The product of "sector-size" and "sectors" must also be an integer
> + * multiple of "physical-sector-size", if that node is present.
> + *
> +
> **************************************************************
> ***************
> + * Frontend XenBus Nodes
> +
> **************************************************************
> ***************
> + *
> + *----------------------- Request Transport Parameters
> -----------------------
> + *
> + * event-channel
> + * Values: <uint32_t>
> + *
> + * The identifier of the Xen event channel used to signal activity
> + * in the ring buffer.
> + *
> + * ring-ref
> + * Values: <uint32_t>
> + * Notes: 6
> + *
> + * The Xen grant reference granting permission for the backend to
> map
> + * the sole page in a single page sized ring buffer.
> + *
> + * ring-ref%u
> + * Values: <uint32_t>
> + * Notes: 6
> + *
> + * For a frontend providing a multi-page ring, a "number of ring pages"
> + * sized list of nodes, each containing a Xen grant reference granting
> + * permission for the backend to map the page of the ring located
> + * at page index "%u". Page indexes are zero based.
> + *
> + * protocol
> + * Values: string (XEN_IO_PROTO_ABI_*)
> + * Default Value: XEN_IO_PROTO_ABI_NATIVE
> + *
> + * The machine ABI rules governing the format of all ring request and
> + * response structures.
> + *
> + * ring-page-order
> + * Values: <uint32_t>
> + * Default Value: 0
> + * Maximum Value: MAX(ffs(max-ring-pages) - 1,
> max-ring-page-order)
> + * Notes: 1, 3
> + *
> + * The size of the frontend allocated request ring buffer in units
> + * of lb(machine pages). (e.g. 0 == 1 page, 1 = 2 pages, 2 == 4 pages,
> + * etc.).
> + *
> + * num-ring-pages
> + * Values: <uint32_t>
> + * Default Value: 1
> + * Maximum Value: MAX(max-ring-pages,(0x1 <<
> max-ring-page-order))
> + * Notes: DEPRECATED, 2, 3
> + *
> + * The size of the frontend allocated request ring buffer in units of
> + * machine pages. The value must be a power of 2.
> + *
> + *--------------------------------- Features
> ---------------------------------
> + *
> + * feature-persistent
> + * Values: 0/1 (boolean)
> + * Default Value: 0
> + * Notes: 7, 8, 9
> + *
> + * A value of "1" indicates that the frontend will reuse the same grants
> + * for all transactions, allowing the backend to map them with write
> + * access (even when it should be read-only). If the frontend hits the
> + * maximum number of allowed persistently mapped grants, it can
> fallback
> + * to non persistent mode. This will cause a performance degradation,
> + * since the the backend driver will still try to map those grants
> + * persistently. Since the persistent grants protocol is compatible with
> + * the previous protocol, a frontend driver can choose to work in
> + * persistent mode even when the backend doesn't support it.
> + *
> + * It is recommended that the frontend driver stores the persistently
> + * mapped grants in a LIFO queue, so a subset of all persistently
> mapped
> + * grants gets used commonly. This is done in case the backend driver
> + * decides to limit the maximum number of persistently mapped
> grants
> + * to a value less than RING_SIZE *
> BLKIF_MAX_SEGMENTS_PER_REQUEST.
> + *
> + * feature-large-sector-size
> + * Values: 0/1 (boolean)
> + * Default Value: 0
> + *
> + * A value of "1" indicates that the frontend will correctly supply and
> + * interpret all sector-based quantities in terms of the "sector-size"
> + * value supplied in the backend info, whatever that may be set to.
> + * If this node is not present or its value is "0" then it is assumed
> + * that the frontend requires that the logical block size is 512 as it
> + * is hardcoded (which is the case in some frontend implementations).
> + *
> + *------------------------- Virtual Device Properties
> -------------------------
> + *
> + * device-type
> + * Values: "disk", "cdrom", "floppy", etc.
> + *
> + * virtual-device
> + * Values: <uint32_t>
> + *
> + * A value indicating the physical device to virtualize within the
> + * frontend's domain. (e.g. "The first ATA disk", "The third SCSI
> + * disk", etc.)
> + *
> + * See docs/misc/vbd-interface.txt for details on the format of this
> + * value.
> + *
> + * Notes
> + * -----
> + * (1) Multi-page ring buffer scheme first developed in the Citrix XenServer
> + * PV drivers.
> + * (2) Multi-page ring buffer scheme first used in some RedHat distributions
> + * including a distribution deployed on certain nodes of the Amazon
> + * EC2 cluster.
> + * (3) Support for multi-page ring buffers was implemented independently,
> + * in slightly different forms, by both Citrix and RedHat/Amazon.
> + * For full interoperability, block front and backends should publish
> + * identical ring parameters, adjusted for unit differences, to the
> + * XenStore nodes used in both schemes.
> + * (4) Devices that support discard functionality may internally allocate
> space
> + * (discardable extents) in units that are larger than the exported
> logical
> + * block size. If the backing device has such discardable extents the
> + * backend should provide both discard-granularity and
> discard-alignment.
> + * Providing just one of the two may be considered an error by the
> frontend.
> + * Backends supporting discard should include discard-granularity and
> + * discard-alignment even if it supports discarding individual sectors.
> + * Frontends should assume discard-alignment == 0 and
> discard-granularity
> + * == sector size if these keys are missing.
> + * (5) The discard-alignment parameter allows a physical device to be
> + * partitioned into virtual devices that do not necessarily begin or
> + * end on a discardable extent boundary.
> + * (6) When there is only a single page allocated to the request ring,
> + * 'ring-ref' is used to communicate the grant reference for this
> + * page to the backend. When using a multi-page ring, the 'ring-ref'
> + * node is not created. Instead 'ring-ref0' - 'ring-refN' are used.
> + * (7) When using persistent grants data has to be copied from/to the page
> + * where the grant is currently mapped. The overhead of doing this
> copy
> + * however doesn't suppress the speed improvement of not having to
> unmap
> + * the grants.
> + * (8) The frontend driver has to allow the backend driver to map all grants
> + * with write access, even when they should be mapped read-only,
> since
> + * further requests may reuse these grants and require write
> permissions.
> + * (9) Linux implementation doesn't have a limit on the maximum number of
> + * grants that can be persistently mapped in the frontend driver, but
> + * due to the frontent driver implementation it should never be bigger
> + * than RING_SIZE * BLKIF_MAX_SEGMENTS_PER_REQUEST.
> + *(10) The discard-secure property may be present and will be set to 1 if the
> + * backing device supports secure discard.
> + *(11) Only used by Linux and NetBSD.
> + */
> +
> +/*
> + * Multiple hardware queues/rings:
> + * If supported, the backend will write the key "multi-queue-max-queues" to
> + * the directory for that vbd, and set its value to the maximum supported
> + * number of queues.
> + * Frontends that are aware of this feature and wish to use it can write the
> + * key "multi-queue-num-queues" with the number they wish to use, which
> must be
> + * greater than zero, and no more than the value reported by the backend in
> + * "multi-queue-max-queues".
> + *
> + * For frontends requesting just one queue, the usual event-channel and
> + * ring-ref keys are written as before, simplifying the backend processing
> + * to avoid distinguishing between a frontend that doesn't understand the
> + * multi-queue feature, and one that does, but requested only one queue.
> + *
> + * Frontends requesting two or more queues must not write the toplevel
> + * event-channel and ring-ref keys, instead writing those keys under
> sub-keys
> + * having the name "queue-N" where N is the integer ID of the queue/ring
> for
> + * which those keys belong. Queues are indexed from zero.
> + * For example, a frontend with two queues must write the following set of
> + * queue-related keys:
> + *
> + * /local/domain/1/device/vbd/0/multi-queue-num-queues = "2"
> + * /local/domain/1/device/vbd/0/queue-0 = ""
> + * /local/domain/1/device/vbd/0/queue-0/ring-ref = "<ring-ref#0>"
> + * /local/domain/1/device/vbd/0/queue-0/event-channel = "<evtchn#0>"
> + * /local/domain/1/device/vbd/0/queue-1 = ""
> + * /local/domain/1/device/vbd/0/queue-1/ring-ref = "<ring-ref#1>"
> + * /local/domain/1/device/vbd/0/queue-1/event-channel = "<evtchn#1>"
> + *
> + * It is also possible to use multiple queues/rings together with
> + * feature multi-page ring buffer.
> + * For example, a frontend requests two queues/rings and the size of each
> ring
> + * buffer is two pages must write the following set of related keys:
> + *
> + * /local/domain/1/device/vbd/0/multi-queue-num-queues = "2"
> + * /local/domain/1/device/vbd/0/ring-page-order = "1"
> + * /local/domain/1/device/vbd/0/queue-0 = ""
> + * /local/domain/1/device/vbd/0/queue-0/ring-ref0 = "<ring-ref#0>"
> + * /local/domain/1/device/vbd/0/queue-0/ring-ref1 = "<ring-ref#1>"
> + * /local/domain/1/device/vbd/0/queue-0/event-channel = "<evtchn#0>"
> + * /local/domain/1/device/vbd/0/queue-1 = ""
> + * /local/domain/1/device/vbd/0/queue-1/ring-ref0 = "<ring-ref#2>"
> + * /local/domain/1/device/vbd/0/queue-1/ring-ref1 = "<ring-ref#3>"
> + * /local/domain/1/device/vbd/0/queue-1/event-channel = "<evtchn#1>"
> + *
> + */
> +
> +/*
> + * STATE DIAGRAMS
> + *
> +
> **************************************************************
> ***************
> + * Startup
> *
> +
> **************************************************************
> ***************
> + *
> + * Tool stack creates front and back nodes with state
> XenbusStateInitialising.
> + *
> + * Front Back
> + * =================================
> =====================================
> + * XenbusStateInitialising XenbusStateInitialising
> + * o Query virtual device o Query backend device
> identification
> + * properties. data.
> + * o Setup OS device instance. o Open and validate backend
> device.
> + * o Publish backend
> features and
> + * transport parameters.
> + * |
> + * |
> + * V
> + * XenbusStateInitWait
> + *
> + * o Query backend features and
> + * transport parameters.
> + * o Allocate and initialize the
> + * request ring.
> + * o Publish transport parameters
> + * that will be in effect during
> + * this connection.
> + * |
> + * |
> + * V
> + * XenbusStateInitialised
> + *
> + * o Query frontend
> transport parameters.
> + * o Connect to the request
> ring and
> + * event channel.
> + * o Publish backend device
> properties.
> + * |
> + * |
> + * V
> + * XenbusStateConnected
> + *
> + * o Query backend device properties.
> + * o Finalize OS virtual device
> + * instance.
> + * |
> + * |
> + * V
> + * XenbusStateConnected
> + *
> + * Note: Drivers that do not support any optional features, or the
> negotiation
> + * of transport parameters, can skip certain states in the state
> machine:
> + *
> + * o A frontend may transition to XenbusStateInitialised without
> + * waiting for the backend to enter XenbusStateInitWait. In this
> + * case, default transport parameters are in effect and any
> + * transport parameters published by the frontend must contain
> + * their default values.
> + *
> + * o A backend may transition to XenbusStateInitialised, bypassing
> + * XenbusStateInitWait, without waiting for the frontend to first
> + * enter the XenbusStateInitialised state. In this case, default
> + * transport parameters are in effect and any transport
> parameters
> + * published by the backend must contain their default values.
> + *
> + * Drivers that support optional features and/or transport parameter
> + * negotiation must tolerate these additional state transition paths.
> + * In general this means performing the work of any skipped state
> + * transition, if it has not already been performed, in addition to the
> + * work associated with entry into the current state.
> + */
> +
> +/*
> + * REQUEST CODES.
> + */
> +#define BLKIF_OP_READ 0
> +#define BLKIF_OP_WRITE 1
> +/*
> + * All writes issued prior to a request with the BLKIF_OP_WRITE_BARRIER
> + * operation code ("barrier request") must be completed prior to the
> + * execution of the barrier request. All writes issued after the barrier
> + * request must not execute until after the completion of the barrier
> request.
> + *
> + * Optional. See "feature-barrier" XenBus node documentation above.
> + */
> +#define BLKIF_OP_WRITE_BARRIER 2
> +/*
> + * Commit any uncommitted contents of the backing device's volatile cache
> + * to stable storage.
> + *
> + * Optional. See "feature-flush-cache" XenBus node documentation above.
> + */
> +#define BLKIF_OP_FLUSH_DISKCACHE 3
> +/*
> + * Used in SLES sources for device specific command packet
> + * contained within the request. Reserved for that purpose.
> + */
> +#define BLKIF_OP_RESERVED_1 4
> +/*
> + * Indicate to the backend device that a region of storage is no longer in
> + * use, and may be discarded at any time without impact to the client. If
> + * the BLKIF_DISCARD_SECURE flag is set on the request, all copies of the
> + * discarded region on the device must be rendered unrecoverable before
> the
> + * command returns.
> + *
> + * This operation is analogous to performing a trim (ATA) or unamp (SCSI),
> + * command on a native device.
> + *
> + * More information about trim/unmap operations can be found at:
> + *
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Ft13.org
> %2FDocuments%2FUploadedDocuments%2Fdocs2008%2F&data=02%7
> C01%7Cpeng.fan%40nxp.com%7Cdd87f4854f514bc096ba08d81ddc0812%7C
> 686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637292178170181802
> &sdata=JOOjsvkjqxkuoF47PMVw1loNNDhxPCXQVdPQQklTIGM%3D&am
> p;reserved=0
> + * e07154r6-Data_Set_Management_Proposal_for_ATA-ACS2.doc
> + *
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.s
> eagate.com%2Fstaticfiles%2Fsupport%2Fdisc%2Fmanuals%2F&data=02
> %7C01%7Cpeng.fan%40nxp.com%7Cdd87f4854f514bc096ba08d81ddc0812%
> 7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C6372921781701818
> 02&sdata=gd5Cvr1Q9%2Bv%2BfUS5OleuozBITkjbybYoR302s4XsVv8%3D
> &reserved=0
> + * Interface%20manuals/100293068c.pdf
> + *
> + * Optional. See "feature-discard", "discard-alignment",
> + * "discard-granularity", and "discard-secure" in the XenBus node
> + * documentation above.
> + */
> +#define BLKIF_OP_DISCARD 5
> +
> +/*
> + * Recognized if "feature-max-indirect-segments" in present in the backend
> + * xenbus info. The "feature-max-indirect-segments" node contains the
> maximum
> + * number of segments allowed by the backend per request. If the node is
> + * present, the frontend might use blkif_request_indirect structs in order to
> + * issue requests with more than BLKIF_MAX_SEGMENTS_PER_REQUEST
> (11). The
> + * maximum number of indirect segments is fixed by the backend, but the
> + * frontend can issue requests with any number of indirect segments as long
> as
> + * it's less than the number provided by the backend. The indirect_grefs
> field
> + * in blkif_request_indirect should be filled by the frontend with the
> + * grant references of the pages that are holding the indirect segments.
> + * These pages are filled with an array of blkif_request_segment that hold
> the
> + * information about the segments. The number of indirect pages to use is
> + * determined by the number of segments an indirect request contains.
> Every
> + * indirect page can contain a maximum of
> + * (PAGE_SIZE / sizeof(struct blkif_request_segment)) segments, so to
> + * calculate the number of indirect pages to use we have to do
> + * ceil(indirect_segments / (PAGE_SIZE / sizeof(struct
> blkif_request_segment))).
> + *
> + * If a backend does not recognize BLKIF_OP_INDIRECT, it should *not*
> + * create the "feature-max-indirect-segments" node!
> + */
> +#define BLKIF_OP_INDIRECT 6
> +
> +/*
> + * Maximum scatter/gather segments per request.
> + * This is carefully chosen so that sizeof(blkif_ring_t) <= PAGE_SIZE.
> + * NB. This could be 12 if the ring indexes weren't stored in the same page.
> + */
> +#define BLKIF_MAX_SEGMENTS_PER_REQUEST 11
> +
> +/*
> + * Maximum number of indirect pages to use per request.
> + */
> +#define BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST 8
> +
> +/*
> + * NB. 'first_sect' and 'last_sect' in blkif_request_segment, as well as
> + * 'sector_number' in blkif_request, blkif_request_discard and
> + * blkif_request_indirect are sector-based quantities. See the description
> + * of the "feature-large-sector-size" frontend xenbus node above for
> + * more information.
> + */
> +struct blkif_request_segment {
> + grant_ref_t gref; /* reference to I/O buffer frame */
> + /* @first_sect: first sector in frame to transfer (inclusive). */
> + /* @last_sect: last sector in frame to transfer (inclusive). */
> + u8 first_sect, last_sect;
> +};
> +
> +/*
> + * Starting ring element for any I/O request.
> + */
> +struct blkif_request {
> + u8 operation; /* BLKIF_OP_???
> */
> + u8 nr_segments; /* number of segments
> */
> + blkif_vdev_t handle; /* only for read/write requests
> */
> + u64 id; /* private guest value, echoed in resp */
> + blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
> + struct blkif_request_segment
> seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
> +};
> +
> +typedef struct blkif_request blkif_request_t;
> +
> +/*
> + * Cast to this structure when blkif_request.operation ==
> BLKIF_OP_DISCARD
> + * sizeof(struct blkif_request_discard) <= sizeof(struct blkif_request)
> + */
> +struct blkif_request_discard {
> + u8 operation; /* BLKIF_OP_DISCARD
> */
> + u8 flag; /* BLKIF_DISCARD_SECURE or zero
> */
> +#define BLKIF_DISCARD_SECURE (1 << 0) /* ignored if discard-secure=0
> */
> + blkif_vdev_t handle; /* same as for read/write requests
> */
> + u64 id; /* private guest value, echoed in resp */
> + blkif_sector_t sector_number;/* start sector idx on disk
> */
> + u64 nr_sectors; /* number of contiguous sectors to discard*/
> +};
> +
> +typedef struct blkif_request_discard blkif_request_discard_t;
> +
> +struct blkif_request_indirect {
> + u8 operation; /* BLKIF_OP_INDIRECT
> */
> + u8 indirect_op; /* BLKIF_OP_{READ/WRITE}
> */
> + u16 nr_segments; /* number of segments
> */
> + u64 id; /* private guest value, echoed in resp */
> + blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
> + blkif_vdev_t handle; /* same as for read/write requests
> */
> + grant_ref_t
> indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST];
> +#ifdef __i386__
> + u64 pad; /* Make it 64 byte aligned on i386
> */
> +#endif
> +};
> +
> +typedef struct blkif_request_indirect blkif_request_indirect_t;
> +
> +struct blkif_response {
> + u64 id; /* copied from request */
> + u8 operation; /* copied from request */
> + s16 status; /* BLKIF_RSP_??? */
> +};
> +
> +typedef struct blkif_response blkif_response_t;
> +
> +/*
> + * STATUS RETURN CODES.
> + */
> + /* Operation not supported (only happens on barrier writes). */
> +#define BLKIF_RSP_EOPNOTSUPP -2
> + /* Operation failed for some unspecified reason (-EIO). */
> +#define BLKIF_RSP_ERROR -1
> + /* Operation completed successfully. */
> +#define BLKIF_RSP_OKAY 0
> +
> +/*
> + * Generate blkif ring structures and types.
> + */
> +DEFINE_RING_TYPES(blkif, struct blkif_request, struct blkif_response);
> +
> +#define VDISK_CDROM 0x1
> +#define VDISK_REMOVABLE 0x2
> +#define VDISK_READONLY 0x4
> +
> +#endif /* __XEN_PUBLIC_IO_BLKIF_H__ */
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-file-style: "BSD"
> + * c-basic-offset: 4
> + * tab-width: 4
> + * indent-tabs-mode: nil
> + * End:
> + */
> diff --git a/include/xen/interface/io/console.h
> b/include/xen/interface/io/console.h
> new file mode 100644
> index 0000000000..3489fc7a60
> --- /dev/null
> +++ b/include/xen/interface/io/console.h
> @@ -0,0 +1,56 @@
> +/************************************************************
> ******************
> + * console.h
> + *
> + * Console I/O interface for Xen guest OSes.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (c) 2005, Keir Fraser
> + */
> +
> +#ifndef __XEN_PUBLIC_IO_CONSOLE_H__
> +#define __XEN_PUBLIC_IO_CONSOLE_H__
> +
> +typedef u32 XENCONS_RING_IDX;
> +
> +#define MASK_XENCONS_IDX(idx, ring) ((idx) & (sizeof(ring) - 1))
> +
> +struct xencons_interface {
> + char in[1024];
> + char out[2048];
> + XENCONS_RING_IDX in_cons, in_prod;
> + XENCONS_RING_IDX out_cons, out_prod;
> +};
> +
> +#ifdef XEN_WANT_FLEX_CONSOLE_RING
> +#include "ring.h"
> +DEFINE_XEN_FLEX_RING(xencons);
> +#endif
> +
> +#endif /* __XEN_PUBLIC_IO_CONSOLE_H__ */
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-file-style: "BSD"
> + * c-basic-offset: 4
> + * tab-width: 4
> + * indent-tabs-mode: nil
> + * End:
> + */
> diff --git a/include/xen/interface/io/protocols.h
> b/include/xen/interface/io/protocols.h
> new file mode 100644
> index 0000000000..52b4de0f81
> --- /dev/null
> +++ b/include/xen/interface/io/protocols.h
> @@ -0,0 +1,42 @@
> +/************************************************************
> ******************
> + * protocols.h
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (c) 2008, Keir Fraser
> + */
> +
> +#ifndef __XEN_PROTOCOLS_H__
> +#define __XEN_PROTOCOLS_H__
> +
> +#define XEN_IO_PROTO_ABI_X86_32 "x86_32-abi"
> +#define XEN_IO_PROTO_ABI_X86_64 "x86_64-abi"
> +#define XEN_IO_PROTO_ABI_ARM "arm-abi"
> +
> +#if defined(__i386__)
> +# define XEN_IO_PROTO_ABI_NATIVE XEN_IO_PROTO_ABI_X86_32
> +#elif defined(__x86_64__)
> +# define XEN_IO_PROTO_ABI_NATIVE XEN_IO_PROTO_ABI_X86_64
> +#elif defined(__arm__) || defined(__aarch64__)
> +# define XEN_IO_PROTO_ABI_NATIVE XEN_IO_PROTO_ABI_ARM
> +#else
> +# error arch fixup needed here
> +#endif
> +
> +#endif
> diff --git a/include/xen/interface/io/ring.h b/include/xen/interface/io/ring.h
> new file mode 100644
> index 0000000000..4e02678e3c
> --- /dev/null
> +++ b/include/xen/interface/io/ring.h
> @@ -0,0 +1,479 @@
> +/************************************************************
> ******************
> + * ring.h
> + *
> + * Shared producer-consumer ring macros.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Tim Deegan and Andrew Warfield November 2004.
> + */
> +
> +#ifndef __XEN_PUBLIC_IO_RING_H__
> +#define __XEN_PUBLIC_IO_RING_H__
> +
> +/*
> + * When #include'ing this header, you need to provide the following
> + * declaration upfront:
> + * - standard integers types (u8, u16, etc)
> + * They are provided by stdint.h of the standard headers.
> + *
> + * In addition, if you intend to use the FLEX macros, you also need to
> + * provide the following, before invoking the FLEX macros:
> + * - size_t
> + * - memcpy
> + * - grant_ref_t
> + * These declarations are provided by string.h of the standard headers,
> + * and grant_table.h from the Xen public headers.
> + */
> +
> +#include <xen/interface/grant_table.h>
> +
> +typedef unsigned int RING_IDX;
> +
> +/* Round a 32-bit unsigned constant down to the nearest power of two. */
> +#define __RD2(_x) (((_x) & 0x00000002) ? 0x2 : ((_x)
> & 0x1))
> +#define __RD4(_x) (((_x) & 0x0000000c) ? __RD2((_x)>>2)<<2 :
> __RD2(_x))
> +#define __RD8(_x) (((_x) & 0x000000f0) ? __RD4((_x)>>4)<<4 :
> __RD4(_x))
> +#define __RD16(_x) (((_x) & 0x0000ff00) ? __RD8((_x)>>8)<<8 :
> __RD8(_x))
> +#define __RD32(_x) (((_x) & 0xffff0000) ? __RD16((_x)>>16)<<16 :
> __RD16(_x))
> +
> +/*
> + * Calculate size of a shared ring, given the total available space for the
> + * ring and indexes (_sz), and the name tag of the request/response
> structure.
> + * A ring contains as many entries as will fit, rounded down to the nearest
> + * power of two (so we can mask with (size-1) to loop around).
> + */
> +#define __CONST_RING_SIZE(_s, _sz) \
> + (__RD32(((_sz) - offsetof(struct _s##_sring, ring)) / \
> + sizeof(((struct _s##_sring *)0)->ring[0])))
> +/*
> + * The same for passing in an actual pointer instead of a name tag.
> + */
> +#define __RING_SIZE(_s, _sz) \
> + (__RD32(((_sz) - (long)(_s)->ring + (long)(_s)) /
> sizeof((_s)->ring[0])))
> +
> +/*
> + * Macros to make the correct C datatypes for a new kind of ring.
> + *
> + * To make a new ring datatype, you need to have two message structures,
> + * let's say request_t, and response_t already defined.
> + *
> + * In a header where you want the ring datatype declared, you then do:
> + *
> + * DEFINE_RING_TYPES(mytag, request_t, response_t);
> + *
> + * These expand out to give you a set of types, as you can see below.
> + * The most important of these are:
> + *
> + * mytag_sring_t - The shared ring.
> + * mytag_front_ring_t - The 'front' half of the ring.
> + * mytag_back_ring_t - The 'back' half of the ring.
> + *
> + * To initialize a ring in your code you need to know the location and size
> + * of the shared memory area (PAGE_SIZE, for instance). To initialise
> + * the front half:
> + *
> + * mytag_front_ring_t front_ring;
> + * SHARED_RING_INIT((mytag_sring_t *)shared_page);
> + * FRONT_RING_INIT(&front_ring, (mytag_sring_t *)shared_page,
> PAGE_SIZE);
> + *
> + * Initializing the back follows similarly (note that only the front
> + * initializes the shared ring):
> + *
> + * mytag_back_ring_t back_ring;
> + * BACK_RING_INIT(&back_ring, (mytag_sring_t *)shared_page,
> PAGE_SIZE);
> + */
> +
> +#define DEFINE_RING_TYPES(__name, __req_t, __rsp_t)
> \
> +
> \
> +/* Shared ring entry */
> \
> +union __name##_sring_entry
> { \
> + __req_t req;
> \
> + __rsp_t rsp;
> \
> +};
> \
> +
> \
> +/* Shared ring page */
> \
> +struct __name##_sring
> { \
> + RING_IDX req_prod, req_event;
> \
> + RING_IDX rsp_prod, rsp_event;
> \
> + union
> {
> \
> + struct
> { \
> + u8 smartpoll_active;
> \
> + } netif;
> \
> + struct
> { \
> + u8 msg;
> \
> + } tapif_user;
> \
> + u8 pvt_pad[4];
> \
> + } pvt;
> \
> + u8 __pad[44];
> \
> + union __name##_sring_entry ring[1]; /* variable-length */
> \
> +};
> \
> +
> \
> +/* "Front" end's private variables */
> \
> +struct __name##_front_ring
> { \
> + RING_IDX req_prod_pvt;
> \
> + RING_IDX rsp_cons;
> \
> + unsigned int nr_ents;
> \
> + struct __name##_sring *sring;
> \
> +};
> \
> +
> \
> +/* "Back" end's private variables */
> \
> +struct __name##_back_ring
> { \
> + RING_IDX rsp_prod_pvt;
> \
> + RING_IDX req_cons;
> \
> + unsigned int nr_ents;
> \
> + struct __name##_sring *sring;
> \
> +};
> \
> +
> \
> +/* Syntactic sugar */
> \
> +typedef struct __name##_sring __name##_sring_t;
> \
> +typedef struct __name##_front_ring __name##_front_ring_t;
> \
> +typedef struct __name##_back_ring __name##_back_ring_t
> +
> +/*
> + * Macros for manipulating rings.
> + *
> + * FRONT_RING_whatever works on the "front end" of a ring: here
> + * requests are pushed on to the ring and responses taken off it.
> + *
> + * BACK_RING_whatever works on the "back end" of a ring: here
> + * requests are taken off the ring and responses put on.
> + *
> + * N.B. these macros do NO INTERLOCKS OR FLOW CONTROL.
> + * This is OK in 1-for-1 request-response situations where the
> + * requestor (front end) never has more than RING_SIZE()-1
> + * outstanding requests.
> + */
> +
> +/* Initialising empty rings */
> +#define SHARED_RING_INIT(_s) do
> { \
> + (_s)->req_prod = (_s)->rsp_prod = 0;
> \
> + (_s)->req_event = (_s)->rsp_event = 1;
> \
> + (void)memset((_s)->pvt.pvt_pad, 0, sizeof((_s)->pvt.pvt_pad));
> \
> + (void)memset((_s)->__pad, 0, sizeof((_s)->__pad));
> \
> +} while (0)
> +
> +#define FRONT_RING_INIT(_r, _s, __size) do
> { \
> + (_r)->req_prod_pvt = 0;
> \
> + (_r)->rsp_cons = 0;
> \
> + (_r)->nr_ents = __RING_SIZE(_s, __size);
> \
> + (_r)->sring = (_s);
> \
> +} while (0)
> +
> +#define BACK_RING_INIT(_r, _s, __size) do
> { \
> + (_r)->rsp_prod_pvt = 0;
> \
> + (_r)->req_cons = 0;
> \
> + (_r)->nr_ents = __RING_SIZE(_s, __size);
> \
> + (_r)->sring = (_s);
> \
> +} while (0)
> +
> +/* How big is this ring? */
> +#define RING_SIZE(_r)
> \
> + ((_r)->nr_ents)
> +
> +/* Number of free requests (for use on front side only). */
> +#define RING_FREE_REQUESTS(_r)
> \
> + (RING_SIZE(_r) - ((_r)->req_prod_pvt - (_r)->rsp_cons))
> +
> +/* Test if there is an empty slot available on the front ring.
> + * (This is only meaningful from the front. )
> + */
> +#define RING_FULL(_r)
> \
> + (RING_FREE_REQUESTS(_r) == 0)
> +
> +/* Test if there are outstanding messages to be processed on a ring. */
> +#define RING_HAS_UNCONSUMED_RESPONSES(_r)
> \
> + ((_r)->sring->rsp_prod - (_r)->rsp_cons)
> +
> +#ifdef __GNUC__
> +#define RING_HAS_UNCONSUMED_REQUESTS(_r)
> ({ \
> + unsigned int req = (_r)->sring->req_prod - (_r)->req_cons;
> \
> + unsigned int rsp = RING_SIZE(_r) -
> \
> + ((_r)->req_cons - (_r)->rsp_prod_pvt);
> \
> + req < rsp ? req : rsp;
> \
> +})
> +#else
> +/* Same as above, but without the nice GCC ({ ... }) syntax. */
> +#define RING_HAS_UNCONSUMED_REQUESTS(_r)
> \
> + ((((_r)->sring->req_prod - (_r)->req_cons) <
> \
> + (RING_SIZE(_r) - ((_r)->req_cons - (_r)->rsp_prod_pvt))) ?
> \
> + ((_r)->sring->req_prod - (_r)->req_cons) :
> \
> + (RING_SIZE(_r) - ((_r)->req_cons - (_r)->rsp_prod_pvt)))
> +#endif
> +
> +/* Direct access to individual ring elements, by index. */
> +#define RING_GET_REQUEST(_r, _idx)
> \
> + (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].req))
> +
> +/*
> + * Get a local copy of a request.
> + *
> + * Use this in preference to RING_GET_REQUEST() so all processing is
> + * done on a local copy that cannot be modified by the other end.
> + *
> + * Note that
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgcc.gn
> u.org%2Fbugzilla%2Fshow_bug.cgi%3Fid%3D58145&data=02%7C01%7C
> peng.fan%40nxp.com%7Cdd87f4854f514bc096ba08d81ddc0812%7C686ea1d
> 3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637292178170181802&sd
> ata=hZDVA%2FOZbJO%2Fh4uzROYzVzmB05ekJWbcnkDAXsHzClc%3D&re
> served=0 may cause this
> + * to be ineffective where _req is a struct which consists of only bitfields.
> + */
> +#define RING_COPY_REQUEST(_r, _idx, _req) do {
> \
> + /* Use volatile to force the copy into _req. */
> \
> + *(_req) = *(volatile typeof(_req))RING_GET_REQUEST(_r, _idx);
> \
> +} while (0)
> +
> +#define RING_GET_RESPONSE(_r, _idx)
> \
> + (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].rsp))
> +
> +/* Loop termination condition: Would the specified index overflow the ring?
> */
> +#define RING_REQUEST_CONS_OVERFLOW(_r, _cons)
> \
> + (((_cons) - (_r)->rsp_prod_pvt) >= RING_SIZE(_r))
> +
> +/* Ill-behaved frontend determination: Can there be this many requests? */
> +#define RING_REQUEST_PROD_OVERFLOW(_r, _prod)
> \
> + (((_prod) - (_r)->rsp_prod_pvt) > RING_SIZE(_r))
> +
> +#define RING_PUSH_REQUESTS(_r) do
> { \
> + xen_wmb(); /* back sees requests /before/ updated producer index */
> \
> + (_r)->sring->req_prod = (_r)->req_prod_pvt;
> \
> +} while (0)
> +
> +#define RING_PUSH_RESPONSES(_r) do
> { \
> + xen_wmb(); /* front sees resps /before/ updated producer index */
> \
> + (_r)->sring->rsp_prod = (_r)->rsp_prod_pvt;
> \
> +} while (0)
> +
> +/*
> + * Notification hold-off (req_event and rsp_event):
> + *
> + * When queueing requests or responses on a shared ring, it may not always
> be
> + * necessary to notify the remote end. For example, if requests are in flight
> + * in a backend, the front may be able to queue further requests without
> + * notifying the back (if the back checks for new requests when it queues
> + * responses).
> + *
> + * When enqueuing requests or responses:
> + *
> + * Use RING_PUSH_{REQUESTS,RESPONSES}_AND_CHECK_NOTIFY(). The
> second argument
> + * is a boolean return value. True indicates that the receiver requires an
> + * asynchronous notification.
> + *
> + * After dequeuing requests or responses (before sleeping the connection):
> + *
> + * Use RING_FINAL_CHECK_FOR_REQUESTS() or
> RING_FINAL_CHECK_FOR_RESPONSES().
> + * The second argument is a boolean return value. True indicates that there
> + * are pending messages on the ring (i.e., the connection should not be put
> + * to sleep).
> + *
> + * These macros will set the req_event/rsp_event field to trigger a
> + * notification on the very next message that is enqueued. If you want to
> + * create batches of work (i.e., only receive a notification after several
> + * messages have been enqueued) then you will need to create a
> customised
> + * version of the FINAL_CHECK macro in your own code, which sets the
> event
> + * field appropriately.
> + */
> +
> +#define RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(_r, _notify) do
> { \
> + RING_IDX __old = (_r)->sring->req_prod;
> \
> + RING_IDX __new = (_r)->req_prod_pvt;
> \
> + xen_wmb(); /* back sees requests /before/ updated producer index */
> \
> + (_r)->sring->req_prod = __new;
> \
> + xen_mb(); /* back sees new requests /before/ we check req_event */
> \
> + (_notify) = ((RING_IDX)(__new - (_r)->sring->req_event) <
> \
> + (RING_IDX)(__new - __old));
> \
> +} while (0)
> +
> +#define RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(_r, _notify) do
> { \
> + RING_IDX __old = (_r)->sring->rsp_prod;
> \
> + RING_IDX __new = (_r)->rsp_prod_pvt;
> \
> + xen_wmb(); /* front sees resps /before/ updated producer index */
> \
> + (_r)->sring->rsp_prod = __new;
> \
> + xen_mb(); /* front sees new resps /before/ we check rsp_event */
> \
> + (_notify) = ((RING_IDX)(__new - (_r)->sring->rsp_event) <
> \
> + (RING_IDX)(__new - __old));
> \
> +} while (0)
> +
> +#define RING_FINAL_CHECK_FOR_REQUESTS(_r, _work_to_do) do
> { \
> + (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r);
> \
> + if (_work_to_do)
> \
> + break;
> \
> + (_r)->sring->req_event = (_r)->req_cons + 1;
> \
> + xen_mb();
> \
> + (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r);
> \
> +} while (0)
> +
> +#define RING_FINAL_CHECK_FOR_RESPONSES(_r, _work_to_do) do
> { \
> + (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r);
> \
> + if (_work_to_do)
> \
> + break;
> \
> + (_r)->sring->rsp_event = (_r)->rsp_cons + 1;
> \
> + xen_mb();
> \
> + (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r);
> \
> +} while (0)
> +
> +/*
> + * DEFINE_XEN_FLEX_RING_AND_INTF defines two monodirectional rings
> and
> + * functions to check if there is data on the ring, and to read and
> + * write to them.
> + *
> + * DEFINE_XEN_FLEX_RING is similar to
> DEFINE_XEN_FLEX_RING_AND_INTF, but
> + * does not define the indexes page. As different protocols can have
> + * extensions to the basic format, this macro allow them to define their
> + * own struct.
> + *
> + * XEN_FLEX_RING_SIZE
> + * Convenience macro to calculate the size of one of the two rings
> + * from the overall order.
> + *
> + * $NAME_mask
> + * Function to apply the size mask to an index, to reduce the index
> + * within the range [0-size].
> + *
> + * $NAME_read_packet
> + * Function to read data from the ring. The amount of data to read is
> + * specified by the "size" argument.
> + *
> + * $NAME_write_packet
> + * Function to write data to the ring. The amount of data to write is
> + * specified by the "size" argument.
> + *
> + * $NAME_get_ring_ptr
> + * Convenience function that returns a pointer to read/write to the
> + * ring at the right location.
> + *
> + * $NAME_data_intf
> + * Indexes page, shared between frontend and backend. It also
> + * contains the array of grant refs.
> + *
> + * $NAME_queued
> + * Function to calculate how many bytes are currently on the ring,
> + * ready to be read. It can also be used to calculate how much free
> + * space is currently on the ring (XEN_FLEX_RING_SIZE() -
> + * $NAME_queued()).
> + */
> +
> +#ifndef XEN_PAGE_SHIFT
> +/* The PAGE_SIZE for ring protocols and hypercall interfaces is always
> + * 4K, regardless of the architecture, and page granularity chosen by
> + * operating systems.
> + */
> +#define XEN_PAGE_SHIFT 12
> +#endif
> +#define XEN_FLEX_RING_SIZE(order)
> \
> + (1UL << ((order) + XEN_PAGE_SHIFT - 1))
> +
> +#define DEFINE_XEN_FLEX_RING(name)
> \
> +static inline RING_IDX name##_mask(RING_IDX idx, RING_IDX ring_size)
> \
> +{
> \
> + return idx & (ring_size - 1);
> \
> +}
> \
> +
> \
> +static inline unsigned char *name##_get_ring_ptr(unsigned char *buf,
> \
> + RING_IDX idx,
> \
> + RING_IDX ring_size)
> \
> +{
> \
> + return buf + name##_mask(idx, ring_size);
> \
> +}
> \
> +
> \
> +static inline void name##_read_packet(void *opaque,
> \
> + const unsigned char *buf,
> \
> + size_t size,
> \
> + RING_IDX masked_prod,
> \
> + RING_IDX *masked_cons,
> \
> + RING_IDX ring_size)
> \
> +{
> \
> + if (*masked_cons < masked_prod ||
> \
> + size <= ring_size - *masked_cons)
> { \
> + memcpy(opaque, buf + *masked_cons, size);
> \
> + } else
> {
> \
> + memcpy(opaque, buf + *masked_cons, ring_size - *masked_cons);
> \
> + memcpy((unsigned char *)opaque + ring_size - *masked_cons, buf,
> \
> + size - (ring_size - *masked_cons));
> \
> + }
> \
> + *masked_cons = name##_mask(*masked_cons + size, ring_size);
> \
> +}
> \
> +
> \
> +static inline void name##_write_packet(unsigned char *buf,
> \
> + const void *opaque,
> \
> + size_t size,
> \
> + RING_IDX *masked_prod,
> \
> + RING_IDX masked_cons,
> \
> + RING_IDX ring_size)
> \
> +{
> \
> + if (*masked_prod < masked_cons ||
> \
> + size <= ring_size - *masked_prod)
> { \
> + memcpy(buf + *masked_prod, opaque, size);
> \
> + } else
> {
> \
> + memcpy(buf + *masked_prod, opaque, ring_size - *masked_prod);
> \
> + memcpy(buf, (unsigned char *)opaque + (ring_size -
> *masked_prod),
> \
> + size - (ring_size - *masked_prod));
> \
> + }
> \
> + *masked_prod = name##_mask(*masked_prod + size, ring_size);
> \
> +}
> \
> +
> \
> +static inline RING_IDX name##_queued(RING_IDX prod,
> \
> + RING_IDX cons,
> \
> + RING_IDX ring_size)
> \
> +{
> \
> + RING_IDX size;
> \
> +
> \
> + if (prod == cons)
> \
> + return 0;
> \
> +
> \
> + prod = name##_mask(prod, ring_size);
> \
> + cons = name##_mask(cons, ring_size);
> \
> +
> \
> + if (prod == cons)
> \
> + return ring_size;
> \
> +
> \
> + if (prod > cons)
> \
> + size = prod - cons;
> \
> + else
> \
> + size = ring_size - (cons - prod);
> \
> + return size;
> \
> +}
> \
> +
> \
> +struct name##_data
> {
> \
> + unsigned char *in; /* half of the allocation */
> \
> + unsigned char *out; /* half of the allocation */
> \
> +}
> +
> +#define DEFINE_XEN_FLEX_RING_AND_INTF(name)
> \
> +struct name##_data_intf
> { \
> + RING_IDX in_cons, in_prod;
> \
> +
> \
> + u8 pad1[56];
> \
> +
> \
> + RING_IDX out_cons, out_prod;
> \
> +
> \
> + u8 pad2[56];
> \
> +
> \
> + RING_IDX ring_order;
> \
> + grant_ref_t ref[];
> \
> +};
> \
> +DEFINE_XEN_FLEX_RING(name)
> +
> +#endif /* __XEN_PUBLIC_IO_RING_H__ */
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-file-style: "BSD"
> + * c-basic-offset: 4
> + * tab-width: 8
> + * indent-tabs-mode: nil
> + * End:
> + */
> diff --git a/include/xen/interface/io/xenbus.h
> b/include/xen/interface/io/xenbus.h
> new file mode 100644
> index 0000000000..f452748b03
> --- /dev/null
> +++ b/include/xen/interface/io/xenbus.h
> @@ -0,0 +1,81 @@
> +/************************************************************
> *****************
> + * xenbus.h
> + *
> + * Xenbus protocol details.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (C) 2005 XenSource Ltd.
> + */
> +
> +#ifndef _XEN_PUBLIC_IO_XENBUS_H
> +#define _XEN_PUBLIC_IO_XENBUS_H
> +
> +/*
> + * The state of either end of the Xenbus, i.e. the current communication
> + * status of initialisation across the bus. States here imply nothing about
> + * the state of the connection between the driver and the kernel's device
> + * layers.
> + */
> +enum xenbus_state {
> + XenbusStateUnknown = 0,
> +
> + XenbusStateInitialising = 1,
> +
> + /*
> + * InitWait: Finished early initialisation but waiting for information
> + * from the peer or hotplug scripts.
> + */
> + XenbusStateInitWait = 2,
> +
> + /*
> + * Initialised: Waiting for a connection from the peer.
> + */
> + XenbusStateInitialised = 3,
> +
> + XenbusStateConnected = 4,
> +
> + /*
> + * Closing: The device is being closed due to an error or an unplug
> event.
> + */
> + XenbusStateClosing = 5,
> +
> + XenbusStateClosed = 6,
> +
> + /*
> + * Reconfiguring: The device is being reconfigured.
> + */
> + XenbusStateReconfiguring = 7,
> +
> + XenbusStateReconfigured = 8
> +};
> +
> +typedef enum xenbus_state XenbusState;
> +
> +#endif /* _XEN_PUBLIC_IO_XENBUS_H */
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-file-style: "BSD"
> + * c-basic-offset: 4
> + * tab-width: 4
> + * indent-tabs-mode: nil
> + * End:
> + */
> diff --git a/include/xen/interface/io/xs_wire.h
> b/include/xen/interface/io/xs_wire.h
> new file mode 100644
> index 0000000000..87987334bf
> --- /dev/null
> +++ b/include/xen/interface/io/xs_wire.h
> @@ -0,0 +1,151 @@
> +/*
> + * Details of the "wire" protocol between Xen Store Daemon and client
> + * library or guest kernel.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (C) 2005 Rusty Russell IBM Corporation
> + */
> +
> +#ifndef _XS_WIRE_H
> +#define _XS_WIRE_H
> +
> +enum xsd_sockmsg_type {
> + XS_CONTROL,
> +#define XS_DEBUG XS_CONTROL
> + XS_DIRECTORY,
> + XS_READ,
> + XS_GET_PERMS,
> + XS_WATCH,
> + XS_UNWATCH,
> + XS_TRANSACTION_START,
> + XS_TRANSACTION_END,
> + XS_INTRODUCE,
> + XS_RELEASE,
> + XS_GET_DOMAIN_PATH,
> + XS_WRITE,
> + XS_MKDIR,
> + XS_RM,
> + XS_SET_PERMS,
> + XS_WATCH_EVENT,
> + XS_ERROR,
> + XS_IS_DOMAIN_INTRODUCED,
> + XS_RESUME,
> + XS_SET_TARGET,
> + /* XS_RESTRICT has been removed */
> + XS_RESET_WATCHES = XS_SET_TARGET + 2,
> + XS_DIRECTORY_PART,
> +
> + XS_TYPE_COUNT, /* Number of valid types. */
> +
> + XS_INVALID = 0xffff /* Guaranteed to remain an invalid type */
> +};
> +
> +#define XS_WRITE_NONE "NONE"
> +#define XS_WRITE_CREATE "CREATE"
> +#define XS_WRITE_CREATE_EXCL "CREATE|EXCL"
> +
> +/* We hand errors as strings, for portability. */
> +struct xsd_errors {
> + int errnum;
> + const char *errstring;
> +};
> +
> +#ifdef EINVAL
> +#define XSD_ERROR(x) { x, #x }
> +/* LINTED: static unused */
> +static struct xsd_errors xsd_errors[]
> +#if defined(__GNUC__)
> +__attribute__((unused))
> +#endif
> + = {
> + XSD_ERROR(EINVAL),
> + XSD_ERROR(EACCES),
> + XSD_ERROR(EEXIST),
> + XSD_ERROR(EISDIR),
> + XSD_ERROR(ENOENT),
> + XSD_ERROR(ENOMEM),
> + XSD_ERROR(ENOSPC),
> + XSD_ERROR(EIO),
> + XSD_ERROR(ENOTEMPTY),
> + XSD_ERROR(ENOSYS),
> + XSD_ERROR(EROFS),
> + XSD_ERROR(EBUSY),
> + XSD_ERROR(EAGAIN),
> + XSD_ERROR(EISCONN),
> + XSD_ERROR(E2BIG)
> +};
> +#endif
> +
> +struct xsd_sockmsg {
> + u32 type; /* XS_??? */
> + u32 req_id;/* Request identifier, echoed in daemon's response. */
> + u32 tx_id; /* Transaction id (0 if not related to a transaction). */
> + u32 len; /* Length of data following this. */
> +
> + /* Generally followed by nul-terminated string(s). */
> +};
> +
> +enum xs_watch_type {
> + XS_WATCH_PATH = 0,
> + XS_WATCH_TOKEN
> +};
> +
> +/*
> + * `incontents 150 xenstore_struct XenStore wire protocol.
> + *
> + * Inter-domain shared memory communications.
> + */
> +#define XENSTORE_RING_SIZE 1024
> +typedef u32 XENSTORE_RING_IDX;
> +#define MASK_XENSTORE_IDX(idx) ((idx) & (XENSTORE_RING_SIZE - 1))
> +struct xenstore_domain_interface {
> + char req[XENSTORE_RING_SIZE]; /* Requests to xenstore daemon. */
> + char rsp[XENSTORE_RING_SIZE]; /* Replies and async watch events. */
> + XENSTORE_RING_IDX req_cons, req_prod;
> + XENSTORE_RING_IDX rsp_cons, rsp_prod;
> + u32 server_features; /* Bitmap of features supported by the server */
> + u32 connection;
> +};
> +
> +/* Violating this is very bad. See docs/misc/xenstore.txt. */
> +#define XENSTORE_PAYLOAD_MAX 4096
> +
> +/* Violating these just gets you an error back */
> +#define XENSTORE_ABS_PATH_MAX 3072
> +#define XENSTORE_REL_PATH_MAX 2048
> +
> +/* The ability to reconnect a ring */
> +#define XENSTORE_SERVER_FEATURE_RECONNECTION 1
> +
> +/* Valid values for the connection field */
> +#define XENSTORE_CONNECTED 0 /* the steady-state */
> +#define XENSTORE_RECONNECT 1 /* guest has initiated a reconnect */
> +
> +#endif /* _XS_WIRE_H */
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-file-style: "BSD"
> + * c-basic-offset: 4
> + * tab-width: 8
> + * indent-tabs-mode: nil
> + * End:
> + */
> diff --git a/include/xen/interface/memory.h
> b/include/xen/interface/memory.h
> new file mode 100644
> index 0000000000..19959da8b4
> --- /dev/null
> +++ b/include/xen/interface/memory.h
> @@ -0,0 +1,332 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/************************************************************
> ******************
> + * memory.h
> + *
> + * Memory reservation and information.
> + *
> + * Copyright (c) 2005, Keir Fraser <k...@xensource.com>
> + */
> +
> +#ifndef __XEN_PUBLIC_MEMORY_H__
> +#define __XEN_PUBLIC_MEMORY_H__
> +
> +/*
> + * Increase or decrease the specified domain's memory reservation. Returns
> a
> + * -ve errcode on failure, or the # extents successfully allocated or freed.
> + * arg == addr of struct xen_memory_reservation.
> + */
> +#define XENMEM_increase_reservation 0
> +#define XENMEM_decrease_reservation 1
> +#define XENMEM_populate_physmap 6
> +struct xen_memory_reservation {
> + /*
> + * XENMEM_increase_reservation:
> + * OUT: MFN (*not* GMFN) bases of extents that were allocated
> + * XENMEM_decrease_reservation:
> + * IN: GMFN bases of extents to free
> + * XENMEM_populate_physmap:
> + * IN: GPFN bases of extents to populate with memory
> + * OUT: GMFN bases of extents that were allocated
> + * (NB. This command also updates the mach_to_phys translation
> table)
> + */
> + GUEST_HANDLE(xen_pfn_t)extent_start;
> +
> + /* Number of extents, and size/alignment of each (2^extent_order
> pages). */
> + xen_ulong_t nr_extents;
> + unsigned int extent_order;
> +
> + /*
> + * Maximum # bits addressable by the user of the allocated region (e.g.,
> + * I/O devices often have a 32-bit limitation even in 64-bit systems).
> If
> + * zero then the user has no addressing restriction.
> + * This field is not used by XENMEM_decrease_reservation.
> + */
> + unsigned int address_bits;
> +
> + /*
> + * Domain whose reservation is being changed.
> + * Unprivileged domains can specify only DOMID_SELF.
> + */
> + domid_t domid;
> +
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_memory_reservation);
> +
> +/*
> + * An atomic exchange of memory pages. If return code is zero then
> + * @out.extent_list provides GMFNs of the newly-allocated memory.
> + * Returns zero on complete success, otherwise a negative error code.
> + * On complete success then always @nr_exchanged == @in.nr_extents.
> + * On partial success @nr_exchanged indicates how much work was done.
> + */
> +#define XENMEM_exchange 11
> +struct xen_memory_exchange {
> + /*
> + * [IN] Details of memory extents to be exchanged (GMFN bases).
> + * Note that @in.address_bits is ignored and unused.
> + */
> + struct xen_memory_reservation in;
> +
> + /*
> + * [IN/OUT] Details of new memory extents.
> + * We require that:
> + * 1. @in.domid == @out.domid
> + * 2. @in.nr_extents << @in.extent_order ==
> + * @out.nr_extents << @out.extent_order
> + * 3. @in.extent_start and @out.extent_start lists must not overlap
> + * 4. @out.extent_start lists GPFN bases to be populated
> + * 5. @out.extent_start is overwritten with allocated GMFN bases
> + */
> + struct xen_memory_reservation out;
> +
> + /*
> + * [OUT] Number of input extents that were successfully exchanged:
> + * 1. The first @nr_exchanged input extents were successfully
> + * deallocated.
> + * 2. The corresponding first entries in the output extent list
> correctly
> + * indicate the GMFNs that were successfully exchanged.
> + * 3. All other input and output extents are untouched.
> + * 4. If not all input exents are exchanged then the return code of
> this
> + * command will be non-zero.
> + * 5. THIS FIELD MUST BE INITIALISED TO ZERO BY THE CALLER!
> + */
> + xen_ulong_t nr_exchanged;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_memory_exchange);
> +/*
> + * Returns the maximum machine frame number of mapped RAM in this
> system.
> + * This command always succeeds (it never returns an error code).
> + * arg == NULL.
> + */
> +#define XENMEM_maximum_ram_page 2
> +
> +/*
> + * Returns the current or maximum memory reservation, in pages, of the
> + * specified domain (may be DOMID_SELF). Returns -ve errcode on failure.
> + * arg == addr of domid_t.
> + */
> +#define XENMEM_current_reservation 3
> +#define XENMEM_maximum_reservation 4
> +
> +/*
> + * Returns a list of MFN bases of 2MB extents comprising the
> machine_to_phys
> + * mapping table. Architectures which do not have a m2p table do not
> implement
> + * this command.
> + * arg == addr of xen_machphys_mfn_list_t.
> + */
> +#define XENMEM_machphys_mfn_list 5
> +struct xen_machphys_mfn_list {
> + /*
> + * Size of the 'extent_start' array. Fewer entries will be filled if the
> + * machphys table is smaller than max_extents * 2MB.
> + */
> + unsigned int max_extents;
> +
> + /*
> + * Pointer to buffer to fill with list of extent starts. If there are
> + * any large discontiguities in the machine address space, 2MB gaps in
> + * the machphys table will be represented by an MFN base of zero.
> + */
> + GUEST_HANDLE(xen_pfn_t)extent_start;
> +
> + /*
> + * Number of extents written to the above array. This will be smaller
> + * than 'max_extents' if the machphys table is smaller than max_e *
> 2MB.
> + */
> + unsigned int nr_extents;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list);
> +
> +/*
> + * Returns the location in virtual address space of the machine_to_phys
> + * mapping table. Architectures which do not have a m2p table, or which do
> not
> + * map it by default into guest address space, do not implement this
> command.
> + * arg == addr of xen_machphys_mapping_t.
> + */
> +#define XENMEM_machphys_mapping 12
> +struct xen_machphys_mapping {
> + xen_ulong_t v_start, v_end; /* Start and end virtual addresses. */
> + xen_ulong_t max_mfn; /* Maximum MFN that can be looked up.
> */
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mapping_t);
> +
> +#define XENMAPSPACE_shared_info 0 /* shared info page */
> +#define XENMAPSPACE_grant_table 1 /* grant table page */
> +#define XENMAPSPACE_gmfn 2 /* GMFN */
> +#define XENMAPSPACE_gmfn_range 3 /* GMFN range,
> XENMEM_add_to_physmap only. */
> +#define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another dom,
> + * XENMEM_add_to_physmap_range only.
> + */
> +#define XENMAPSPACE_dev_mmio 5 /* device mmio region */
> +
> +/*
> + * Sets the GPFN at which a particular page appears in the specified guest's
> + * pseudophysical address space.
> + * arg == addr of xen_add_to_physmap_t.
> + */
> +#define XENMEM_add_to_physmap 7
> +struct xen_add_to_physmap {
> + /* Which domain to change the mapping for. */
> + domid_t domid;
> +
> + /* Number of pages to go through for gmfn_range */
> + u16 size;
> +
> + /* Source mapping space. */
> + unsigned int space;
> +
> + /* Index into source mapping space. */
> + xen_ulong_t idx;
> +
> + /* GPFN where the source mapping page should appear. */
> + xen_pfn_t gpfn;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
> +
> +/*** REMOVED ***/
> +/*#define XENMEM_translate_gpfn_list 8*/
> +
> +#define XENMEM_add_to_physmap_range 23
> +struct xen_add_to_physmap_range {
> + /* IN */
> + /* Which domain to change the mapping for. */
> + domid_t domid;
> + u16 space; /* => enum phys_map_space */
> +
> + /* Number of pages to go through */
> + u16 size;
> + domid_t foreign_domid; /* IFF gmfn_foreign */
> +
> + /* Indexes into space being mapped. */
> + GUEST_HANDLE(xen_ulong_t)idxs;
> +
> + /* GPFN in domid where the source mapping page should appear. */
> + GUEST_HANDLE(xen_pfn_t)gpfns;
> +
> + /* OUT */
> +
> + /* Per index error code. */
> + GUEST_HANDLE(int)errs;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap_range);
> +
> +/*
> + * Returns the pseudo-physical memory map as it was when the domain
> + * was started (specified by XENMEM_set_memory_map).
> + * arg == addr of struct xen_memory_map.
> + */
> +#define XENMEM_memory_map 9
> +struct xen_memory_map {
> + /*
> + * On call the number of entries which can be stored in buffer. On
> + * return the number of entries which have been stored in
> + * buffer.
> + */
> + unsigned int nr_entries;
> +
> + /*
> + * Entries in the buffer are in the same format as returned by the
> + * BIOS INT 0x15 EAX=0xE820 call.
> + */
> + GUEST_HANDLE(void)buffer;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_memory_map);
> +
> +/*
> + * Returns the real physical memory map. Passes the same structure as
> + * XENMEM_memory_map.
> + * arg == addr of struct xen_memory_map.
> + */
> +#define XENMEM_machine_memory_map 10
> +
> +/*
> + * Unmaps the page appearing at a particular GPFN from the specified
> guest's
> + * pseudophysical address space.
> + * arg == addr of xen_remove_from_physmap_t.
> + */
> +#define XENMEM_remove_from_physmap 15
> +struct xen_remove_from_physmap {
> + /* Which domain to change the mapping for. */
> + domid_t domid;
> +
> + /* GPFN of the current mapping of the page. */
> + xen_pfn_t gpfn;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_remove_from_physmap);
> +
> +/*
> + * Get the pages for a particular guest resource, so that they can be
> + * mapped directly by a tools domain.
> + */
> +#define XENMEM_acquire_resource 28
> +struct xen_mem_acquire_resource {
> + /* IN - The domain whose resource is to be mapped */
> + domid_t domid;
> + /* IN - the type of resource */
> + u16 type;
> +
> +#define XENMEM_resource_ioreq_server 0
> +#define XENMEM_resource_grant_table 1
> +
> + /*
> + * IN - a type-specific resource identifier, which must be zero
> + * unless stated otherwise.
> + *
> + * type == XENMEM_resource_ioreq_server -> id == ioreq server id
> + * type == XENMEM_resource_grant_table -> id defined below
> + */
> + u32 id;
> +
> +#define XENMEM_resource_grant_table_id_shared 0
> +#define XENMEM_resource_grant_table_id_status 1
> +
> + /* IN/OUT - As an IN parameter number of frames of the resource
> + * to be mapped. However, if the specified value is 0 and
> + * frame_list is NULL then this field will be set to the
> + * maximum value supported by the implementation on
> return.
> + */
> + u32 nr_frames;
> + /*
> + * OUT - Must be zero on entry. On return this may contain a bitwise
> + * OR of the following values.
> + */
> + u32 flags;
> +
> + /* The resource pages have been assigned to the calling domain */
> +#define _XENMEM_rsrc_acq_caller_owned 0
> +#define XENMEM_rsrc_acq_caller_owned (1u <<
> _XENMEM_rsrc_acq_caller_owned)
> +
> + /*
> + * IN - the index of the initial frame to be mapped. This parameter
> + * is ignored if nr_frames is 0.
> + */
> + u64 frame;
> +
> +#define XENMEM_resource_ioreq_server_frame_bufioreq 0
> +#define XENMEM_resource_ioreq_server_frame_ioreq(n) (1 + (n))
> +
> + /*
> + * IN/OUT - If the tools domain is PV then, upon return, frame_list
> + * will be populated with the MFNs of the resource.
> + * If the tools domain is HVM then it is expected that, on
> + * entry, frame_list will be populated with a list of GFNs
> + * that will be mapped to the MFNs of the resource.
> + * If -EIO is returned then the frame_list has only been
> + * partially mapped and it is up to the caller to unmap all
> + * the GFNs.
> + * This parameter may be NULL if nr_frames is 0.
> + */
> + GUEST_HANDLE(xen_pfn_t)frame_list;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(xen_mem_acquire_resource);
> +
> +#endif /* __XEN_PUBLIC_MEMORY_H__ */
> diff --git a/include/xen/interface/sched.h b/include/xen/interface/sched.h
> new file mode 100644
> index 0000000000..0f12dcf267
> --- /dev/null
> +++ b/include/xen/interface/sched.h
> @@ -0,0 +1,188 @@
> +/************************************************************
> ******************
> + * sched.h
> + *
> + * Scheduler state interactions
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (c) 2005, Keir Fraser <k...@xensource.com>
> + */
> +
> +#ifndef __XEN_PUBLIC_SCHED_H__
> +#define __XEN_PUBLIC_SCHED_H__
> +
> +#include <xen/interface/event_channel.h>
> +
> +/*
> + * Guest Scheduler Operations
> + *
> + * The SCHEDOP interface provides mechanisms for a guest to interact
> + * with the scheduler, including yield, blocking and shutting itself
> + * down.
> + */
> +
> +/*
> + * The prototype for this hypercall is:
> + * long HYPERVISOR_sched_op(enum sched_op cmd, void *arg, ...)
> + *
> + * @cmd == SCHEDOP_??? (scheduler operation).
> + * @arg == Operation-specific extra argument(s), as described below.
> + * ... == Additional Operation-specific extra arguments, described below.
> + *
> + * Versions of Xen prior to 3.0.2 provided only the following legacy version
> + * of this hypercall, supporting only the commands yield, block and
> shutdown:
> + * long sched_op(int cmd, unsigned long arg)
> + * @cmd == SCHEDOP_??? (scheduler operation).
> + * @arg == 0 (SCHEDOP_yield and SCHEDOP_block)
> + * == SHUTDOWN_* code (SCHEDOP_shutdown)
> + *
> + * This legacy version is available to new guests as:
> + * long HYPERVISOR_sched_op_compat(enum sched_op cmd, unsigned long
> arg)
> + */
> +
> +/*
> + * Voluntarily yield the CPU.
> + * @arg == NULL.
> + */
> +#define SCHEDOP_yield 0
> +
> +/*
> + * Block execution of this VCPU until an event is received for processing.
> + * If called with event upcalls masked, this operation will atomically
> + * reenable event delivery and check for pending events before blocking the
> + * VCPU. This avoids a "wakeup waiting" race.
> + * @arg == NULL.
> + */
> +#define SCHEDOP_block 1
> +
> +/*
> + * Halt execution of this domain (all VCPUs) and notify the system
> controller.
> + * @arg == pointer to sched_shutdown structure.
> + *
> + * If the sched_shutdown_t reason is SHUTDOWN_suspend then
> + * x86 PV guests must also set RDX (EDX for 32-bit guests) to the MFN
> + * of the guest's start info page. RDX/EDX is the third hypercall
> + * argument.
> + *
> + * In addition, which reason is SHUTDOWN_suspend this hypercall
> + * returns 1 if suspend was cancelled or the domain was merely
> + * checkpointed, and 0 if it is resuming in a new domain.
> + */
> +#define SCHEDOP_shutdown 2
> +
> +/*
> + * Poll a set of event-channel ports. Return when one or more are pending.
> An
> + * optional timeout may be specified.
> + * @arg == pointer to sched_poll structure.
> + */
> +#define SCHEDOP_poll 3
> +
> +/*
> + * Declare a shutdown for another domain. The main use of this function is
> + * in interpreting shutdown requests and reasons for fully-virtualized
> + * domains. A para-virtualized domain may use SCHEDOP_shutdown
> directly.
> + * @arg == pointer to sched_remote_shutdown structure.
> + */
> +#define SCHEDOP_remote_shutdown 4
> +
> +/*
> + * Latch a shutdown code, so that when the domain later shuts down it
> + * reports this code to the control tools.
> + * @arg == sched_shutdown, as for SCHEDOP_shutdown.
> + */
> +#define SCHEDOP_shutdown_code 5
> +
> +/*
> + * Setup, poke and destroy a domain watchdog timer.
> + * @arg == pointer to sched_watchdog structure.
> + * With id == 0, setup a domain watchdog timer to cause domain shutdown
> + * after timeout, returns watchdog id.
> + * With id != 0 and timeout == 0, destroy domain watchdog timer.
> + * With id != 0 and timeout != 0, poke watchdog timer and set new timeout.
> + */
> +#define SCHEDOP_watchdog 6
> +
> +/*
> + * Override the current vcpu affinity by pinning it to one physical cpu or
> + * undo this override restoring the previous affinity.
> + * @arg == pointer to sched_pin_override structure.
> + *
> + * A negative pcpu value will undo a previous pin override and restore the
> + * previous cpu affinity.
> + * This call is allowed for the hardware domain only and requires the cpu
> + * to be part of the domain's cpupool.
> + */
> +#define SCHEDOP_pin_override 7
> +
> +struct sched_shutdown {
> + unsigned int reason; /* SHUTDOWN_* => shutdown reason */
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(sched_shutdown);
> +
> +struct sched_poll {
> + GUEST_HANDLE(evtchn_port_t)ports;
> + unsigned int nr_ports;
> + u64 timeout;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(sched_poll);
> +
> +struct sched_remote_shutdown {
> + domid_t domain_id; /* Remote domain ID */
> + unsigned int reason; /* SHUTDOWN_* => shutdown reason */
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(sched_remote_shutdown);
> +
> +struct sched_watchdog {
> + u32 id; /* watchdog ID */
> + u32 timeout; /* timeout */
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(sched_watchdog);
> +
> +struct sched_pin_override {
> + s32 pcpu;
> +};
> +
> +DEFINE_GUEST_HANDLE_STRUCT(sched_pin_override);
> +
> +/*
> + * Reason codes for SCHEDOP_shutdown. These may be interpreted by
> control
> + * software to determine the appropriate action. For the most part, Xen does
> + * not care about the shutdown code.
> + */
> +#define SHUTDOWN_poweroff 0 /* Domain exited normally. Clean up
> and kill. */
> +#define SHUTDOWN_reboot 1 /* Clean up, kill, and then restart.
> */
> +#define SHUTDOWN_suspend 2 /* Clean up, save suspend info, kill.
> */
> +#define SHUTDOWN_crash 3 /* Tell controller we've crashed.
> */
> +#define SHUTDOWN_watchdog 4 /* Restart because watchdog time
> expired. */
> +
> +/*
> + * Domain asked to perform 'soft reset' for it. The expected behavior is to
> + * reset internal Xen state for the domain returning it to the point where it
> + * was created but leaving the domain's memory contents and vCPU
> contexts
> + * intact. This will allow the domain to start over and set up all Xen
> specific
> + * interfaces again.
> + */
> +#define SHUTDOWN_soft_reset 5
> +#define SHUTDOWN_MAX 5 /* Maximum valid shutdown reason.
> */
> +
> +#endif /* __XEN_PUBLIC_SCHED_H__ */
> diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
> new file mode 100644
> index 0000000000..964daaedfb
> --- /dev/null
> +++ b/include/xen/interface/xen.h
> @@ -0,0 +1,225 @@
> +/************************************************************
> ******************
> + * xen.h
> + *
> + * Guest OS interface to Xen.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense,
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
> KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
> OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (c) 2004, K A Fraser
> + */
> +
> +#ifndef __XEN_PUBLIC_XEN_H__
> +#define __XEN_PUBLIC_XEN_H__
> +
> +#include <xen/arm/interface.h>
> +
> +/*
> + * XEN "SYSTEM CALLS" (a.k.a. HYPERCALLS).
> + */
> +
> +/*
> + * x86_32: EAX = vector; EBX, ECX, EDX, ESI, EDI = args 1, 2, 3, 4, 5.
> + * EAX = return value
> + * (argument registers may be clobbered on return)
> + * x86_64: RAX = vector; RDI, RSI, RDX, R10, R8, R9 = args 1, 2, 3, 4, 5, 6.
> + * RAX = return value
> + * (argument registers not clobbered on return; RCX, R11 are)
> + */
> +#define __HYPERVISOR_set_trap_table 0
> +#define __HYPERVISOR_mmu_update 1
> +#define __HYPERVISOR_set_gdt 2
> +#define __HYPERVISOR_stack_switch 3
> +#define __HYPERVISOR_set_callbacks 4
> +#define __HYPERVISOR_fpu_taskswitch 5
> +#define __HYPERVISOR_sched_op_compat 6
> +#define __HYPERVISOR_platform_op 7
> +#define __HYPERVISOR_set_debugreg 8
> +#define __HYPERVISOR_get_debugreg 9
> +#define __HYPERVISOR_update_descriptor 10
> +#define __HYPERVISOR_memory_op 12
> +#define __HYPERVISOR_multicall 13
> +#define __HYPERVISOR_update_va_mapping 14
> +#define __HYPERVISOR_set_timer_op 15
> +#define __HYPERVISOR_event_channel_op_compat 16
> +#define __HYPERVISOR_xen_version 17
> +#define __HYPERVISOR_console_io 18
> +#define __HYPERVISOR_physdev_op_compat 19
> +#define __HYPERVISOR_grant_table_op 20
> +#define __HYPERVISOR_vm_assist 21
> +#define __HYPERVISOR_update_va_mapping_otherdomain 22
> +#define __HYPERVISOR_iret 23 /* x86 only */
> +#define __HYPERVISOR_vcpu_op 24
> +#define __HYPERVISOR_set_segment_base 25 /* x86/64 only */
> +#define __HYPERVISOR_mmuext_op 26
> +#define __HYPERVISOR_xsm_op 27
> +#define __HYPERVISOR_nmi_op 28
> +#define __HYPERVISOR_sched_op 29
> +#define __HYPERVISOR_callback_op 30
> +#define __HYPERVISOR_xenoprof_op 31
> +#define __HYPERVISOR_event_channel_op 32
> +#define __HYPERVISOR_physdev_op 33
> +#define __HYPERVISOR_hvm_op 34
> +#define __HYPERVISOR_sysctl 35
> +#define __HYPERVISOR_domctl 36
> +#define __HYPERVISOR_kexec_op 37
> +#define __HYPERVISOR_tmem_op 38
> +#define __HYPERVISOR_xc_reserved_op 39 /* reserved for
> XenClient */
> +#define __HYPERVISOR_xenpmu_op 40
> +#define __HYPERVISOR_dm_op 41
> +
> +/* Architecture-specific hypercall definitions. */
> +#define __HYPERVISOR_arch_0 48
> +#define __HYPERVISOR_arch_1 49
> +#define __HYPERVISOR_arch_2 50
> +#define __HYPERVISOR_arch_3 51
> +#define __HYPERVISOR_arch_4 52
> +#define __HYPERVISOR_arch_5 53
> +#define __HYPERVISOR_arch_6 54
> +#define __HYPERVISOR_arch_7 55
> +
> +#ifndef __ASSEMBLY__
> +
> +typedef u16 domid_t;
> +
> +/* Domain ids >= DOMID_FIRST_RESERVED cannot be used for ordinary
> domains. */
> +#define DOMID_FIRST_RESERVED (0x7FF0U)
> +
> +/* DOMID_SELF is used in certain contexts to refer to oneself. */
> +#define DOMID_SELF (0x7FF0U)
> +
> +/*
> + * DOMID_IO is used to restrict page-table updates to mapping I/O memory.
> + * Although no Foreign Domain need be specified to map I/O pages,
> DOMID_IO
> + * is useful to ensure that no mappings to the OS's own heap are accidentally
> + * installed. (e.g., in Linux this could cause havoc as reference counts
> + * aren't adjusted on the I/O-mapping code path).
> + * This only makes sense in MMUEXT_SET_FOREIGNDOM, but in that
> context can
> + * be specified by any calling domain.
> + */
> +#define DOMID_IO (0x7FF1U)
> +
> +/*
> + * DOMID_XEN is used to allow privileged domains to map restricted parts of
> + * Xen's heap space (e.g., the machine_to_phys table).
> + * This only makes sense in MMUEXT_SET_FOREIGNDOM, and is only
> permitted if
> + * the caller is privileged.
> + */
> +#define DOMID_XEN (0x7FF2U)
> +
> +/* DOMID_COW is used as the owner of sharable pages */
> +#define DOMID_COW (0x7FF3U)
> +
> +/* DOMID_INVALID is used to identify pages with unknown owner. */
> +#define DOMID_INVALID (0x7FF4U)
> +
> +/* Idle domain. */
> +#define DOMID_IDLE (0x7FFFU)
> +
> +struct vcpu_info {
> + /*
> + * 'evtchn_upcall_pending' is written non-zero by Xen to indicate
> + * a pending notification for a particular VCPU. It is then cleared
> + * by the guest OS /before/ checking for pending work, thus avoiding
> + * a set-and-check race. Note that the mask is only accessed by Xen
> + * on the CPU that is currently hosting the VCPU. This means that the
> + * pending and mask flags can be updated by the guest without special
> + * synchronisation (i.e., no need for the x86 LOCK prefix).
> + * This may seem suboptimal because if the pending flag is set by
> + * a different CPU then an IPI may be scheduled even when the mask
> + * is set. However, note:
> + * 1. The task of 'interrupt holdoff' is covered by the per-event-
> + * channel mask bits. A 'noisy' event that is continually being
> + * triggered can be masked at source at this very precise
> + * granularity.
> + * 2. The main purpose of the per-VCPU mask is therefore to restrict
> + * reentrant execution: whether for concurrency control, or to
> + * prevent unbounded stack usage. Whatever the purpose, we
> expect
> + * that the mask will be asserted only for short periods at a time,
> + * and so the likelihood of a 'spurious' IPI is suitably small.
> + * The mask is read before making an event upcall to the guest: a
> + * non-zero mask therefore guarantees that the VCPU will not receive
> + * an upcall activation. The mask is cleared when the VCPU requests
> + * to block: this avoids wakeup-waiting races.
> + */
> + u8 evtchn_upcall_pending;
> + u8 evtchn_upcall_mask;
> + xen_ulong_t evtchn_pending_sel;
> + struct arch_vcpu_info arch;
> + struct pvclock_vcpu_time_info time;
> +}; /* 64 bytes (x86) */
> +
> +/*
> + * Xen/kernel shared data -- pointer provided in start_info.
> + * NB. We expect that this struct is smaller than a page.
> + */
> +struct shared_info {
> + struct vcpu_info vcpu_info[MAX_VIRT_CPUS];
> +
> + /*
> + * A domain can create "event channels" on which it can send and
> receive
> + * asynchronous event notifications. There are three classes of event
> that
> + * are delivered by this mechanism:
> + * 1. Bi-directional inter- and intra-domain connections. Domains must
> + * arrange out-of-band to set up a connection (usually by allocating
> + * an unbound 'listener' port and avertising that via a storage
> service
> + * such as xenstore).
> + * 2. Physical interrupts. A domain with suitable hardware-access
> + * privileges can bind an event-channel port to a physical interrupt
> + * source.
> + * 3. Virtual interrupts ('events'). A domain can bind an event-channel
> + * port to a virtual interrupt source, such as the virtual-timer
> + * device or the emergency console.
> + *
> + * Event channels are addressed by a "port index". Each channel is
> + * associated with two bits of information:
> + * 1. PENDING -- notifies the domain that there is a pending
> notification
> + * to be processed. This bit is cleared by the guest.
> + * 2. MASK -- if this bit is clear then a 0->1 transition of PENDING
> + * will cause an asynchronous upcall to be scheduled. This bit is
> only
> + * updated by the guest. It is read-only within Xen. If a channel
> + * becomes pending while the channel is masked then the 'edge' is
> lost
> + * (i.e., when the channel is unmasked, the guest must manually
> handle
> + * pending notifications as no upcall will be scheduled by Xen).
> + *
> + * To expedite scanning of pending notifications, any 0->1 pending
> + * transition on an unmasked channel causes a corresponding bit in a
> + * per-vcpu selector word to be set. Each bit in the selector covers a
> + * 'C long' in the PENDING bitfield array.
> + */
> + xen_ulong_t evtchn_pending[sizeof(xen_ulong_t) * 8];
> + xen_ulong_t evtchn_mask[sizeof(xen_ulong_t) * 8];
> +
> + /*
> + * Wallclock time: updated only by control software. Guests should base
> + * their gettimeofday() syscall on this wallclock-base value.
> + */
> + struct pvclock_wall_clock wc;
> +
> + struct arch_shared_info arch;
> +
> +};
> +
> +#else /* __ASSEMBLY__ */
> +
> +/* In assembly code we cannot use C numeric constant suffixes. */
> +#define mk_unsigned_long(x) x
> +
> +#endif /* !__ASSEMBLY__ */
> +
> +#endif /* __XEN_PUBLIC_XEN_H__ */
> --
> 2.17.1
