From: Peter Xu <pet...@redhat.com> AddressSpaceOps is similar to MemoryRegionOps, it's just for address spaces to store arch-specific hooks.
The first hook I would like to introduce is iommu_get(). Return an IOMMUObject behind the AddressSpace. For systems that have IOMMUs, we will create a special address space per device which is different from system default address space for it (please refer to pci_device_iommu_address_space()). Normally when that happens, there will be one specific IOMMU (or say, translation unit) stands right behind that new address space. This iommu_get() fetches that guy behind the address space. Here, the guy is defined as IOMMUObject, which includes a notifier_list so far, may extend in future. Along with IOMMUObject, a new iommu notifier mechanism is introduced. It would be used for virt-svm. Also IOMMUObject can further have a IOMMUObjectOps which is similar to MemoryRegionOps. The difference is IOMMUObjectOps is not relied on MemoryRegion. Signed-off-by: Peter Xu <pet...@redhat.com> Signed-off-by: Liu, Yi L <yi.l....@linux.intel.com> --- hw/core/Makefile.objs | 1 + hw/core/iommu.c | 58 +++++++++++++++++++++++++++++++++++++++ include/exec/memory.h | 22 +++++++++++++++ include/hw/core/iommu.h | 73 +++++++++++++++++++++++++++++++++++++++++++++++++ memory.c | 10 +++++-- 5 files changed, 162 insertions(+), 2 deletions(-) create mode 100644 hw/core/iommu.c create mode 100644 include/hw/core/iommu.h diff --git a/hw/core/Makefile.objs b/hw/core/Makefile.objs index f8d7a4a..d688412 100644 --- a/hw/core/Makefile.objs +++ b/hw/core/Makefile.objs @@ -5,6 +5,7 @@ common-obj-y += fw-path-provider.o # irq.o needed for qdev GPIO handling: common-obj-y += irq.o common-obj-y += hotplug.o +common-obj-y += iommu.o common-obj-y += nmi.o common-obj-$(CONFIG_EMPTY_SLOT) += empty_slot.o diff --git a/hw/core/iommu.c b/hw/core/iommu.c new file mode 100644 index 0000000..7c4fcfe --- /dev/null +++ b/hw/core/iommu.c @@ -0,0 +1,58 @@ +/* + * QEMU emulation of IOMMU logic + * + * Copyright (C) 2017 Red Hat Inc. + * + * Authors: Peter Xu <pet...@redhat.com>, + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "qemu/osdep.h" +#include "hw/core/iommu.h" + +void iommu_notifier_register(IOMMUObject *iommu, + IOMMUNotifier *n, + IOMMUNotifyFn fn, + IOMMUEvent event) +{ + n->event = event; + n->iommu_notify = fn; + QLIST_INSERT_HEAD(&iommu->iommu_notifiers, n, node); + return; +} + +void iommu_notifier_unregister(IOMMUObject *iommu, + IOMMUNotifier *notifier) +{ + IOMMUNotifier *cur, *next; + + QLIST_FOREACH_SAFE(cur, &iommu->iommu_notifiers, node, next) { + if (cur == notifier) { + QLIST_REMOVE(cur, node); + break; + } + } +} + +void iommu_notify(IOMMUObject *iommu, IOMMUEventData *event_data) +{ + IOMMUNotifier *cur; + + QLIST_FOREACH(cur, &iommu->iommu_notifiers, node) { + if ((cur->event == event_data->event) && cur->iommu_notify) { + cur->iommu_notify(cur, event_data); + } + } +} diff --git a/include/exec/memory.h b/include/exec/memory.h index 03595e3..8350973 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -26,6 +26,7 @@ #include "qom/object.h" #include "qemu/rcu.h" #include "hw/qdev-core.h" +#include "hw/core/iommu.h" #define RAM_ADDR_INVALID (~(ram_addr_t)0) @@ -301,6 +302,19 @@ struct MemoryListener { }; /** + * AddressSpaceOps: callbacks structure for address space specific operations + * + * @iommu_get: returns an IOMMU object that backs the address space. + * Normally this should be NULL for generic address + * spaces, and it's only used when there is one + * translation unit behind this address space. + */ +struct AddressSpaceOps { + IOMMUObject *(*iommu_get)(AddressSpace *as); +}; +typedef struct AddressSpaceOps AddressSpaceOps; + +/** * AddressSpace: describes a mapping of addresses to #MemoryRegion objects */ struct AddressSpace { @@ -316,6 +330,7 @@ struct AddressSpace { struct MemoryRegionIoeventfd *ioeventfds; QTAILQ_HEAD(memory_listeners_as, MemoryListener) listeners; QTAILQ_ENTRY(AddressSpace) address_spaces_link; + AddressSpaceOps as_ops; }; FlatView *address_space_to_flatview(AddressSpace *as); @@ -1988,6 +2003,13 @@ address_space_write_cached(MemoryRegionCache *cache, hwaddr addr, address_space_write(cache->as, cache->xlat + addr, MEMTXATTRS_UNSPECIFIED, buf, len); } +/** + * address_space_iommu_get: Get the backend IOMMU for the address space + * + * @as: the address space to fetch IOMMU from + */ +IOMMUObject *address_space_iommu_get(AddressSpace *as); + #endif #endif diff --git a/include/hw/core/iommu.h b/include/hw/core/iommu.h new file mode 100644 index 0000000..34387c0 --- /dev/null +++ b/include/hw/core/iommu.h @@ -0,0 +1,73 @@ +/* + * QEMU emulation of IOMMU logic + * + * Copyright (C) 2017 Red Hat Inc. + * + * Authors: Peter Xu <pet...@redhat.com>, + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef HW_CORE_IOMMU_H +#define HW_CORE_IOMMU_H + +#include "qemu/queue.h" + +enum IOMMUEvent { + IOMMU_EVENT_BIND_PASIDT, +}; +typedef enum IOMMUEvent IOMMUEvent; + +struct IOMMUEventData { + IOMMUEvent event; + uint64_t length; + void *data; +}; +typedef struct IOMMUEventData IOMMUEventData; + +typedef struct IOMMUNotifier IOMMUNotifier; + +typedef void (*IOMMUNotifyFn)(IOMMUNotifier *notifier, + IOMMUEventData *event_data); + +struct IOMMUNotifier { + IOMMUNotifyFn iommu_notify; + /* + * What events we are listening to. Let's allow multiple event + * registrations from beginning. + */ + IOMMUEvent event; + QLIST_ENTRY(IOMMUNotifier) node; +}; + +typedef struct IOMMUObject IOMMUObject; + +/* + * This stands for an IOMMU unit. Any translation device should have + * this struct inside its own structure to make sure it can leverage + * common IOMMU functionalities. + */ +struct IOMMUObject { + QLIST_HEAD(, IOMMUNotifier) iommu_notifiers; +}; + +void iommu_notifier_register(IOMMUObject *iommu, + IOMMUNotifier *n, + IOMMUNotifyFn fn, + IOMMUEvent event); +void iommu_notifier_unregister(IOMMUObject *iommu, + IOMMUNotifier *notifier); +void iommu_notify(IOMMUObject *iommu, IOMMUEventData *event_data); + +#endif diff --git a/memory.c b/memory.c index 77fb3ef..307f665 100644 --- a/memory.c +++ b/memory.c @@ -235,8 +235,6 @@ struct FlatView { MemoryRegion *root; }; -typedef struct AddressSpaceOps AddressSpaceOps; - #define FOR_EACH_FLAT_RANGE(var, view) \ for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var) @@ -2793,6 +2791,14 @@ static void do_address_space_destroy(AddressSpace *as) memory_region_unref(as->root); } +IOMMUObject *address_space_iommu_get(AddressSpace *as) +{ + if (!as->as_ops.iommu_get) { + return NULL; + } + return as->as_ops.iommu_get(as); +} + void address_space_destroy(AddressSpace *as) { MemoryRegion *root = as->root; -- 1.9.1