On Mon, Jan 07, 2019 at 07:43:17PM +0100, Cédric Le Goater wrote:
> This is the basic framework for the new KVM device supporting the XIVE
> native exploitation mode. The user interface exposes a new capability
> and a new KVM device to be used by QEMU.
>
> Internally, the interface to the new KVM device is protected with a
> new interrupt mode: KVMPPC_IRQ_XIVE.
>
> Signed-off-by: Cédric Le Goater <c...@kaod.org>
> ---
> arch/powerpc/include/asm/kvm_host.h | 2 +
> arch/powerpc/include/asm/kvm_ppc.h | 21 ++
> arch/powerpc/kvm/book3s_xive.h | 3 +
> include/uapi/linux/kvm.h | 3 +
> arch/powerpc/kvm/book3s.c | 7 +-
> arch/powerpc/kvm/book3s_xive_native.c | 332 ++++++++++++++++++++++++++
> arch/powerpc/kvm/powerpc.c | 30 +++
> arch/powerpc/kvm/Makefile | 2 +-
> 8 files changed, 398 insertions(+), 2 deletions(-)
> create mode 100644 arch/powerpc/kvm/book3s_xive_native.c
>
> diff --git a/arch/powerpc/include/asm/kvm_host.h
> b/arch/powerpc/include/asm/kvm_host.h
> index 0f98f00da2ea..c522e8274ad9 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -220,6 +220,7 @@ extern struct kvm_device_ops kvm_xics_ops;
> struct kvmppc_xive;
> struct kvmppc_xive_vcpu;
> extern struct kvm_device_ops kvm_xive_ops;
> +extern struct kvm_device_ops kvm_xive_native_ops;
>
> struct kvmppc_passthru_irqmap;
>
> @@ -446,6 +447,7 @@ struct kvmppc_passthru_irqmap {
> #define KVMPPC_IRQ_DEFAULT 0
> #define KVMPPC_IRQ_MPIC 1
> #define KVMPPC_IRQ_XICS 2 /* Includes a XIVE option */
> +#define KVMPPC_IRQ_XIVE 3 /* XIVE native exploitation mode */
>
> #define MMIO_HPTE_CACHE_SIZE 4
>
> diff --git a/arch/powerpc/include/asm/kvm_ppc.h
> b/arch/powerpc/include/asm/kvm_ppc.h
> index eb0d79f0ca45..1bb313f238fe 100644
> --- a/arch/powerpc/include/asm/kvm_ppc.h
> +++ b/arch/powerpc/include/asm/kvm_ppc.h
> @@ -591,6 +591,18 @@ extern int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu,
> u64 icpval);
> extern int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq,
> int level, bool line_status);
> extern void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu);
> +
> +static inline int kvmppc_xive_enabled(struct kvm_vcpu *vcpu)
> +{
> + return vcpu->arch.irq_type == KVMPPC_IRQ_XIVE;
> +}
> +
> +extern int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev,
> + struct kvm_vcpu *vcpu, u32 cpu);
> +extern void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu);
> +extern void kvmppc_xive_native_init_module(void);
> +extern void kvmppc_xive_native_exit_module(void);
> +
> #else
> static inline int kvmppc_xive_set_xive(struct kvm *kvm, u32 irq, u32 server,
> u32 priority) { return -1; }
> @@ -614,6 +626,15 @@ static inline int kvmppc_xive_set_icp(struct kvm_vcpu
> *vcpu, u64 icpval) { retur
> static inline int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id,
> u32 irq,
> int level, bool line_status) { return
> -ENODEV; }
> static inline void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu) { }
> +
> +static inline int kvmppc_xive_enabled(struct kvm_vcpu *vcpu)
> + { return 0; }
> +static inline int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev,
> + struct kvm_vcpu *vcpu, u32
> cpu) { return -EBUSY; }
> +static inline void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu) { }
> +static inline void kvmppc_xive_native_init_module(void) { }
> +static inline void kvmppc_xive_native_exit_module(void) { }
> +
> #endif /* CONFIG_KVM_XIVE */
>
> /*
> diff --git a/arch/powerpc/kvm/book3s_xive.h b/arch/powerpc/kvm/book3s_xive.h
> index 10c4aa5cd010..5f22415520b4 100644
> --- a/arch/powerpc/kvm/book3s_xive.h
> +++ b/arch/powerpc/kvm/book3s_xive.h
> @@ -12,6 +12,9 @@
> #ifdef CONFIG_KVM_XICS
> #include "book3s_xics.h"
>
> +#define KVMPPC_XIVE_FIRST_IRQ 0
> +#define KVMPPC_XIVE_NR_IRQS KVMPPC_XICS_NR_IRQS
> +
> /*
> * State for one guest irq source.
> *
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 6d4ea4b6c922..52bf74a1616e 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -988,6 +988,7 @@ struct kvm_ppc_resize_hpt {
> #define KVM_CAP_ARM_VM_IPA_SIZE 165
> #define KVM_CAP_MANUAL_DIRTY_LOG_PROTECT 166
> #define KVM_CAP_HYPERV_CPUID 167
> +#define KVM_CAP_PPC_IRQ_XIVE 168
>
> #ifdef KVM_CAP_IRQ_ROUTING
>
> @@ -1211,6 +1212,8 @@ enum kvm_device_type {
> #define KVM_DEV_TYPE_ARM_VGIC_V3 KVM_DEV_TYPE_ARM_VGIC_V3
> KVM_DEV_TYPE_ARM_VGIC_ITS,
> #define KVM_DEV_TYPE_ARM_VGIC_ITS KVM_DEV_TYPE_ARM_VGIC_ITS
> + KVM_DEV_TYPE_XIVE,
> +#define KVM_DEV_TYPE_XIVE KVM_DEV_TYPE_XIVE
> KVM_DEV_TYPE_MAX,
> };
>
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index bd1a677dd9e4..de7eed191107 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -1039,7 +1039,10 @@ static int kvmppc_book3s_init(void)
> #ifdef CONFIG_KVM_XIVE
> if (xive_enabled()) {
> kvmppc_xive_init_module();
> + kvmppc_xive_native_init_module();
> kvm_register_device_ops(&kvm_xive_ops, KVM_DEV_TYPE_XICS);
> + kvm_register_device_ops(&kvm_xive_native_ops,
> + KVM_DEV_TYPE_XIVE);
> } else
> #endif
> kvm_register_device_ops(&kvm_xics_ops, KVM_DEV_TYPE_XICS);
> @@ -1050,8 +1053,10 @@ static int kvmppc_book3s_init(void)
> static void kvmppc_book3s_exit(void)
> {
> #ifdef CONFIG_KVM_XICS
> - if (xive_enabled())
> + if (xive_enabled()) {
> kvmppc_xive_exit_module();
> + kvmppc_xive_native_exit_module();
> + }
> #endif
> #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
> kvmppc_book3s_exit_pr();
> diff --git a/arch/powerpc/kvm/book3s_xive_native.c
> b/arch/powerpc/kvm/book3s_xive_native.c
> new file mode 100644
> index 000000000000..115143e76c45
> --- /dev/null
> +++ b/arch/powerpc/kvm/book3s_xive_native.c
> @@ -0,0 +1,332 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2017-2019, IBM Corporation.
> + */
> +
> +#define pr_fmt(fmt) "xive-kvm: " fmt
> +
> +#include <linux/anon_inodes.h>
> +#include <linux/kernel.h>
> +#include <linux/kvm_host.h>
> +#include <linux/err.h>
> +#include <linux/gfp.h>
> +#include <linux/spinlock.h>
> +#include <linux/delay.h>
> +#include <linux/percpu.h>
> +#include <linux/cpumask.h>
> +#include <asm/uaccess.h>
> +#include <asm/kvm_book3s.h>
> +#include <asm/kvm_ppc.h>
> +#include <asm/hvcall.h>
> +#include <asm/xics.h>
> +#include <asm/xive.h>
> +#include <asm/xive-regs.h>
> +#include <asm/debug.h>
> +#include <asm/debugfs.h>
> +#include <asm/time.h>
> +#include <asm/opal.h>
> +
> +#include <linux/debugfs.h>
> +#include <linux/seq_file.h>
> +
> +#include "book3s_xive.h"
> +
> +static void xive_native_cleanup_queue(struct kvm_vcpu *vcpu, int prio)
> +{
> + struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
> + struct xive_q *q = &xc->queues[prio];
> +
> + xive_native_disable_queue(xc->vp_id, q, prio);
> + if (q->qpage) {
> + put_page(virt_to_page(q->qpage));
> + q->qpage = NULL;
> + }
> +}
> +
> +void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu)
> +{
> + struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
> + int i;
> +
> + if (!kvmppc_xive_enabled(vcpu))
> + return;
> +
> + if (!xc)
> + return;
> +
> + pr_devel("native_cleanup_vcpu(cpu=%d)\n", xc->server_num);
> +
> + /* Ensure no interrupt is still routed to that VP */
> + xc->valid = false;
> + kvmppc_xive_disable_vcpu_interrupts(vcpu);
> +
> + /* Disable the VP */
> + xive_native_disable_vp(xc->vp_id);
> +
> + /* Free the queues & associated interrupts */
> + for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) {
> + /* Free the escalation irq */
> + if (xc->esc_virq[i]) {
> + free_irq(xc->esc_virq[i], vcpu);
> + irq_dispose_mapping(xc->esc_virq[i]);
> + kfree(xc->esc_virq_names[i]);
> + xc->esc_virq[i] = 0;
> + }
> +
> + /* Free the queue */
> + xive_native_cleanup_queue(vcpu, i);
> + }
> +
> + /* Free the VP */
> + kfree(xc);
> +
> + /* Cleanup the vcpu */
> + vcpu->arch.irq_type = KVMPPC_IRQ_DEFAULT;
> + vcpu->arch.xive_vcpu = NULL;
> +}
> +
> +int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev,
> + struct kvm_vcpu *vcpu, u32 cpu)
Why do we need both a *vcpu and a cpu number as an integer?
> +{
> + struct kvmppc_xive *xive = dev->private;
> + struct kvmppc_xive_vcpu *xc;
> + int rc;
> +
> + pr_devel("native_connect_vcpu(cpu=%d)\n", cpu);
> +
> + if (dev->ops != &kvm_xive_native_ops) {
> + pr_devel("Wrong ops !\n");
> + return -EPERM;
> + }
> + if (xive->kvm != vcpu->kvm)
> + return -EPERM;
> + if (vcpu->arch.irq_type)
Please use an explicit == / != here so we don't have to remember which
symbolic value corresponds to 0.
> + return -EBUSY;
> + if (kvmppc_xive_find_server(vcpu->kvm, cpu)) {
> + pr_devel("Duplicate !\n");
> + return -EEXIST;
> + }
> + if (cpu >= KVM_MAX_VCPUS) {
> + pr_devel("Out of bounds !\n");
> + return -EINVAL;
> + }
> + xc = kzalloc(sizeof(*xc), GFP_KERNEL);
> + if (!xc)
> + return -ENOMEM;
> +
> + mutex_lock(&vcpu->kvm->lock);
> + vcpu->arch.xive_vcpu = xc;
> + xc->xive = xive;
> + xc->vcpu = vcpu;
> + xc->server_num = cpu;
> + xc->vp_id = xive->vp_base + cpu;
> + xc->valid = true;
> +
> + rc = xive_native_get_vp_info(xc->vp_id, &xc->vp_cam, &xc->vp_chip_id);
> + if (rc) {
> + pr_err("Failed to get VP info from OPAL: %d\n", rc);
> + goto bail;
> + }
> +
> + /*
> + * Enable the VP first as the single escalation mode will
> + * affect escalation interrupts numbering
> + */
> + rc = xive_native_enable_vp(xc->vp_id, xive->single_escalation);
> + if (rc) {
> + pr_err("Failed to enable VP in OPAL: %d\n", rc);
> + goto bail;
> + }
> +
> + /* Configure VCPU fields for use by assembly push/pull */
> + vcpu->arch.xive_saved_state.w01 = cpu_to_be64(0xff000000);
> + vcpu->arch.xive_cam_word = cpu_to_be32(xc->vp_cam | TM_QW1W2_VO);
> +
> + /* TODO: initialize queues ? */
> +
> +bail:
> + vcpu->arch.irq_type = KVMPPC_IRQ_XIVE;
> + mutex_unlock(&vcpu->kvm->lock);
> + if (rc)
> + kvmppc_xive_native_cleanup_vcpu(vcpu);
> +
> + return rc;
> +}
> +
> +static int kvmppc_xive_native_set_attr(struct kvm_device *dev,
> + struct kvm_device_attr *attr)
> +{
> + return -ENXIO;
> +}
> +
> +static int kvmppc_xive_native_get_attr(struct kvm_device *dev,
> + struct kvm_device_attr *attr)
> +{
> + return -ENXIO;
> +}
> +
> +static int kvmppc_xive_native_has_attr(struct kvm_device *dev,
> + struct kvm_device_attr *attr)
> +{
> + return -ENXIO;
> +}
> +
> +static void kvmppc_xive_native_free(struct kvm_device *dev)
> +{
> + struct kvmppc_xive *xive = dev->private;
> + struct kvm *kvm = xive->kvm;
> + int i;
> +
> + debugfs_remove(xive->dentry);
> +
> + pr_devel("Destroying xive native for partition\n");
> +
> + if (kvm)
> + kvm->arch.xive = NULL;
> +
> + /* Mask and free interrupts */
> + for (i = 0; i <= xive->max_sbid; i++) {
> + if (xive->src_blocks[i])
> + kvmppc_xive_free_sources(xive->src_blocks[i]);
> + kfree(xive->src_blocks[i]);
> + xive->src_blocks[i] = NULL;
> + }
> +
> + if (xive->vp_base != XIVE_INVALID_VP)
> + xive_native_free_vp_block(xive->vp_base);
> +
> + kfree(xive);
> + kfree(dev);
> +}
> +
> +static int kvmppc_xive_native_create(struct kvm_device *dev, u32 type)
> +{
> + struct kvmppc_xive *xive;
> + struct kvm *kvm = dev->kvm;
> + int ret = 0;
> +
> + pr_devel("Creating xive native for partition\n");
> +
> + if (kvm->arch.xive)
> + return -EEXIST;
> +
> + xive = kzalloc(sizeof(*xive), GFP_KERNEL);
> + if (!xive)
> + return -ENOMEM;
> +
> + dev->private = xive;
> + xive->dev = dev;
> + xive->kvm = kvm;
> + kvm->arch.xive = xive;
> +
> + /* We use the default queue size set by the host */
> + xive->q_order = xive_native_default_eq_shift();
> + if (xive->q_order < PAGE_SHIFT)
> + xive->q_page_order = 0;
> + else
> + xive->q_page_order = xive->q_order - PAGE_SHIFT;
> +
> + /* Allocate a bunch of VPs */
> + xive->vp_base = xive_native_alloc_vp_block(KVM_MAX_VCPUS);
> + pr_devel("VP_Base=%x\n", xive->vp_base);
> +
> + if (xive->vp_base == XIVE_INVALID_VP)
> + ret = -ENOMEM;
> +
> + xive->single_escalation = xive_native_has_single_escalation();
> +
> + if (ret)
> + kfree(xive);
> +
> + return ret;
> +}
> +
> +static int xive_native_debug_show(struct seq_file *m, void *private)
> +{
> + struct kvmppc_xive *xive = m->private;
> + struct kvm *kvm = xive->kvm;
> + struct kvm_vcpu *vcpu;
> + unsigned int i;
> +
> + if (!kvm)
> + return 0;
> +
> + seq_puts(m, "=========\nVCPU state\n=========\n");
> +
> + kvm_for_each_vcpu(i, vcpu, kvm) {
> + struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
> +
> + if (!xc)
> + continue;
> +
> + seq_printf(m, "cpu server %#x NSR=%02x CPPR=%02x IBP=%02x
> PIPR=%02x w01=%016llx w2=%08x\n",
> + xc->server_num,
> + vcpu->arch.xive_saved_state.nsr,
> + vcpu->arch.xive_saved_state.cppr,
> + vcpu->arch.xive_saved_state.ipb,
> + vcpu->arch.xive_saved_state.pipr,
> + vcpu->arch.xive_saved_state.w01,
> + (u32) vcpu->arch.xive_cam_word);
> +
> + kvmppc_xive_debug_show_queues(m, vcpu);
> + }
> +
> + return 0;
> +}
> +
> +static int xive_native_debug_open(struct inode *inode, struct file *file)
> +{
> + return single_open(file, xive_native_debug_show, inode->i_private);
> +}
> +
> +static const struct file_operations xive_native_debug_fops = {
> + .open = xive_native_debug_open,
> + .read = seq_read,
> + .llseek = seq_lseek,
> + .release = single_release,
> +};
> +
> +static void xive_native_debugfs_init(struct kvmppc_xive *xive)
> +{
> + char *name;
> +
> + name = kasprintf(GFP_KERNEL, "kvm-xive-%p", xive);
> + if (!name) {
> + pr_err("%s: no memory for name\n", __func__);
> + return;
> + }
> +
> + xive->dentry = debugfs_create_file(name, 0444, powerpc_debugfs_root,
> + xive, &xive_native_debug_fops);
> +
> + pr_debug("%s: created %s\n", __func__, name);
> + kfree(name);
> +}
> +
> +static void kvmppc_xive_native_init(struct kvm_device *dev)
> +{
> + struct kvmppc_xive *xive = (struct kvmppc_xive *)dev->private;
> +
> + /* Register some debug interfaces */
> + xive_native_debugfs_init(xive);
> +}
> +
> +struct kvm_device_ops kvm_xive_native_ops = {
> + .name = "kvm-xive-native",
> + .create = kvmppc_xive_native_create,
> + .init = kvmppc_xive_native_init,
> + .destroy = kvmppc_xive_native_free,
> + .set_attr = kvmppc_xive_native_set_attr,
> + .get_attr = kvmppc_xive_native_get_attr,
> + .has_attr = kvmppc_xive_native_has_attr,
> +};
> +
> +void kvmppc_xive_native_init_module(void)
> +{
> + ;
> +}
> +
> +void kvmppc_xive_native_exit_module(void)
> +{
> + ;
> +}
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index b90a7d154180..01d526e15e9d 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -566,6 +566,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long
> ext)
> case KVM_CAP_PPC_ENABLE_HCALL:
> #ifdef CONFIG_KVM_XICS
> case KVM_CAP_IRQ_XICS:
> +#endif
> +#ifdef CONFIG_KVM_XIVE
> + case KVM_CAP_PPC_IRQ_XIVE:
> #endif
> case KVM_CAP_PPC_GET_CPU_CHAR:
> r = 1;
> @@ -753,6 +756,9 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
> else
> kvmppc_xics_free_icp(vcpu);
> break;
> + case KVMPPC_IRQ_XIVE:
> + kvmppc_xive_native_cleanup_vcpu(vcpu);
> + break;
> }
>
> kvmppc_core_vcpu_free(vcpu);
> @@ -1941,6 +1947,30 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu
> *vcpu,
> break;
> }
> #endif /* CONFIG_KVM_XICS */
> +#ifdef CONFIG_KVM_XIVE
> + case KVM_CAP_PPC_IRQ_XIVE: {
> + struct fd f;
> + struct kvm_device *dev;
> +
> + r = -EBADF;
> + f = fdget(cap->args[0]);
> + if (!f.file)
> + break;
> +
> + r = -ENXIO;
> + if (!xive_enabled())
> + break;
> +
> + r = -EPERM;
> + dev = kvm_device_from_filp(f.file);
> + if (dev)
> + r = kvmppc_xive_native_connect_vcpu(dev, vcpu,
> + cap->args[1]);
> +
> + fdput(f);
> + break;
> + }
> +#endif /* CONFIG_KVM_XIVE */
> #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
> case KVM_CAP_PPC_FWNMI:
> r = -EINVAL;
> diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
> index 64f1135e7732..806cbe488410 100644
> --- a/arch/powerpc/kvm/Makefile
> +++ b/arch/powerpc/kvm/Makefile
> @@ -99,7 +99,7 @@ endif
> kvm-book3s_64-objs-$(CONFIG_KVM_XICS) += \
> book3s_xics.o
>
> -kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o
> +kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o book3s_xive_native.o
> kvm-book3s_64-objs-$(CONFIG_SPAPR_TCE_IOMMU) += book3s_64_vio.o
>
> kvm-book3s_64-module-objs := \
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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