@@ -33,6 +33,8 @@
#define VFIO_MSG_PREFIX "vfio %s: "
+extern const MemoryListener vfio_memory_listener;
+
enum {
VFIO_DEVICE_TYPE_PCI = 0,
VFIO_DEVICE_TYPE_PLATFORM = 1,
@@ -190,6 +192,32 @@ typedef struct VFIODisplay {
} dmabuf;
} VFIODisplay;
+void vfio_host_win_add(VFIOContainer *container,
+ hwaddr min_iova, hwaddr max_iova,
+ uint64_t iova_pgsizes);
+int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
+ hwaddr max_iova);
+VFIOAddressSpace *vfio_get_address_space(AddressSpace *as);
+void vfio_put_address_space(VFIOAddressSpace *space);
+bool vfio_devices_all_running_and_saving(VFIOContainer *container);
+bool vfio_devices_all_dirty_tracking(VFIOContainer *container);
+
+/* container->fd */
+int vfio_dma_unmap(VFIOContainer *container,
+ hwaddr iova, ram_addr_t size,
+ IOMMUTLBEntry *iotlb);
+int vfio_dma_map(VFIOContainer *container, hwaddr iova,
+ ram_addr_t size, void *vaddr, bool readonly);
+void vfio_set_dirty_page_tracking(VFIOContainer *container, bool start);
+int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
+ uint64_t size, ram_addr_t ram_addr);
+
+int vfio_container_add_section_window(VFIOContainer *container,
+ MemoryRegionSection *section,
+ Error **errp);
+void vfio_container_del_section_window(VFIOContainer *container,
+ MemoryRegionSection *section);
+
void vfio_put_base_device(VFIODevice *vbasedev);
void vfio_disable_irqindex(VFIODevice *vbasedev, int index);
void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index);
@@ -42,256 +42,11 @@
#include "migration/migration.h"
#include "sysemu/tpm.h"
-VFIOGroupList vfio_group_list =
- QLIST_HEAD_INITIALIZER(vfio_group_list);
static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
QLIST_HEAD_INITIALIZER(vfio_address_spaces);
-#ifdef CONFIG_KVM
-/*
- * We have a single VFIO pseudo device per KVM VM. Once created it lives
- * for the life of the VM. Closing the file descriptor only drops our
- * reference to it and the device's reference to kvm. Therefore once
- * initialized, this file descriptor is only released on QEMU exit and
- * we'll re-use it should another vfio device be attached before then.
- */
-static int vfio_kvm_device_fd = -1;
-#endif
-
-static int vfio_ram_block_discard_disable(VFIOContainer *container, bool state)
-{
- switch (container->iommu_type) {
- case VFIO_TYPE1v2_IOMMU:
- case VFIO_TYPE1_IOMMU:
- /*
- * We support coordinated discarding of RAM via the RamDiscardManager.
- */
- return ram_block_uncoordinated_discard_disable(state);
- default:
- /*
- * VFIO_SPAPR_TCE_IOMMU most probably works just fine with
- * RamDiscardManager, however, it is completely untested.
- *
- * VFIO_SPAPR_TCE_v2_IOMMU with "DMA memory preregistering" does
- * completely the opposite of managing mapping/pinning dynamically as
- * required by RamDiscardManager. We would have to special-case sections
- * with a RamDiscardManager.
- */
- return ram_block_discard_disable(state);
- }
-}
-
-/*
- * Device state interfaces
- */
-
-bool vfio_mig_active(void)
-{
- VFIOGroup *group;
- VFIODevice *vbasedev;
-
- if (QLIST_EMPTY(&vfio_group_list)) {
- return false;
- }
-
- QLIST_FOREACH(group, &vfio_group_list, next) {
- QLIST_FOREACH(vbasedev, &group->device_list, next) {
- if (vbasedev->migration_blocker) {
- return false;
- }
- }
- }
- return true;
-}
-
-static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
-{
- VFIOGroup *group;
- VFIODevice *vbasedev;
- MigrationState *ms = migrate_get_current();
-
- if (!migration_is_setup_or_active(ms->state)) {
- return false;
- }
-
- QLIST_FOREACH(group, &container->group_list, container_next) {
- QLIST_FOREACH(vbasedev, &group->device_list, next) {
- VFIOMigration *migration = vbasedev->migration;
-
- if (!migration) {
- return false;
- }
-
- if ((vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF)
- && (migration->device_state & VFIO_DEVICE_STATE_V1_RUNNING)) {
- return false;
- }
- }
- }
- return true;
-}
-
-static bool vfio_devices_all_running_and_saving(VFIOContainer *container)
-{
- VFIOGroup *group;
- VFIODevice *vbasedev;
- MigrationState *ms = migrate_get_current();
-
- if (!migration_is_setup_or_active(ms->state)) {
- return false;
- }
-
- QLIST_FOREACH(group, &container->group_list, container_next) {
- QLIST_FOREACH(vbasedev, &group->device_list, next) {
- VFIOMigration *migration = vbasedev->migration;
-
- if (!migration) {
- return false;
- }
-
- if ((migration->device_state & VFIO_DEVICE_STATE_V1_SAVING) &&
- (migration->device_state & VFIO_DEVICE_STATE_V1_RUNNING)) {
- continue;
- } else {
- return false;
- }
- }
- }
- return true;
-}
-
-static int vfio_dma_unmap_bitmap(VFIOContainer *container,
- hwaddr iova, ram_addr_t size,
- IOMMUTLBEntry *iotlb)
-{
- struct vfio_iommu_type1_dma_unmap *unmap;
- struct vfio_bitmap *bitmap;
- uint64_t pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size();
- int ret;
-
- unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
-
- unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
- unmap->iova = iova;
- unmap->size = size;
- unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP;
- bitmap = (struct vfio_bitmap *)&unmap->data;
-
- /*
- * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
- * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize
- * to qemu_real_host_page_size.
- */
-
- bitmap->pgsize = qemu_real_host_page_size();
- bitmap->size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) /
- BITS_PER_BYTE;
-
- if (bitmap->size > container->max_dirty_bitmap_size) {
- error_report("UNMAP: Size of bitmap too big 0x%"PRIx64,
- (uint64_t)bitmap->size);
- ret = -E2BIG;
- goto unmap_exit;
- }
-
- bitmap->data = g_try_malloc0(bitmap->size);
- if (!bitmap->data) {
- ret = -ENOMEM;
- goto unmap_exit;
- }
-
- ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
- if (!ret) {
- cpu_physical_memory_set_dirty_lebitmap((unsigned long *)bitmap->data,
- iotlb->translated_addr, pages);
- } else {
- error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
- }
-
- g_free(bitmap->data);
-unmap_exit:
- g_free(unmap);
- return ret;
-}
-
-/*
- * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
- */
-static int vfio_dma_unmap(VFIOContainer *container,
- hwaddr iova, ram_addr_t size,
- IOMMUTLBEntry *iotlb)
-{
- struct vfio_iommu_type1_dma_unmap unmap = {
- .argsz = sizeof(unmap),
- .flags = 0,
- .iova = iova,
- .size = size,
- };
-
- if (iotlb && container->dirty_pages_supported &&
- vfio_devices_all_running_and_saving(container)) {
- return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
- }
-
- while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
- /*
- * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
- * v4.15) where an overflow in its wrap-around check prevents us from
- * unmapping the last page of the address space. Test for the error
- * condition and re-try the unmap excluding the last page. The
- * expectation is that we've never mapped the last page anyway and this
- * unmap request comes via vIOMMU support which also makes it unlikely
- * that this page is used. This bug was introduced well after type1 v2
- * support was introduced, so we shouldn't need to test for v1. A fix
- * is queued for kernel v5.0 so this workaround can be removed once
- * affected kernels are sufficiently deprecated.
- */
- if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
- container->iommu_type == VFIO_TYPE1v2_IOMMU) {
- trace_vfio_dma_unmap_overflow_workaround();
- unmap.size -= 1ULL << ctz64(container->pgsizes);
- continue;
- }
- error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
- return -errno;
- }
-
- return 0;
-}
-
-static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
- ram_addr_t size, void *vaddr, bool readonly)
-{
- struct vfio_iommu_type1_dma_map map = {
- .argsz = sizeof(map),
- .flags = VFIO_DMA_MAP_FLAG_READ,
- .vaddr = (__u64)(uintptr_t)vaddr,
- .iova = iova,
- .size = size,
- };
-
- if (!readonly) {
- map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
- }
-
- /*
- * Try the mapping, if it fails with EBUSY, unmap the region and try
- * again. This shouldn't be necessary, but we sometimes see it in
- * the VGA ROM space.
- */
- if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
- (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 &&
- ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
- return 0;
- }
-
- error_report("VFIO_MAP_DMA failed: %s", strerror(errno));
- return -errno;
-}
-
-static void vfio_host_win_add(VFIOContainer *container,
- hwaddr min_iova, hwaddr max_iova,
- uint64_t iova_pgsizes)
+void vfio_host_win_add(VFIOContainer *container, hwaddr min_iova,
+ hwaddr max_iova, uint64_t iova_pgsizes)
{
VFIOHostDMAWindow *hostwin;
@@ -312,8 +67,8 @@ static void vfio_host_win_add(VFIOContainer *container,
QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next);
}
-static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
- hwaddr max_iova)
+int vfio_host_win_del(VFIOContainer *container,
+ hwaddr min_iova, hwaddr max_iova)
{
VFIOHostDMAWindow *hostwin;
@@ -590,92 +345,6 @@ static bool vfio_known_safe_misalignment(MemoryRegionSection *section)
return true;
}
-static int vfio_container_add_section_window(VFIOContainer *container,
- MemoryRegionSection *section,
- Error **errp)
-{
- VFIOHostDMAWindow *hostwin;
- hwaddr pgsize = 0;
- int ret;
-
- if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
- return 0;
- }
-
- /* For now intersections are not allowed, we may relax this later */
- QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
- if (ranges_overlap(hostwin->min_iova,
- hostwin->max_iova - hostwin->min_iova + 1,
- section->offset_within_address_space,
- int128_get64(section->size))) {
- error_setg(errp,
- "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing"
- "host DMA window [0x%"PRIx64",0x%"PRIx64"]",
- section->offset_within_address_space,
- section->offset_within_address_space +
- int128_get64(section->size) - 1,
- hostwin->min_iova, hostwin->max_iova);
- return -EINVAL;
- }
- }
-
- ret = vfio_spapr_create_window(container, section, &pgsize);
- if (ret) {
- error_setg_errno(errp, -ret, "Failed to create SPAPR window");
- return ret;
- }
-
- vfio_host_win_add(container, section->offset_within_address_space,
- section->offset_within_address_space +
- int128_get64(section->size) - 1, pgsize);
-#ifdef CONFIG_KVM
- if (kvm_enabled()) {
- VFIOGroup *group;
- IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
- struct kvm_vfio_spapr_tce param;
- struct kvm_device_attr attr = {
- .group = KVM_DEV_VFIO_GROUP,
- .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
- .addr = (uint64_t)(unsigned long)¶m,
- };
-
- if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
- ¶m.tablefd)) {
- QLIST_FOREACH(group, &container->group_list, container_next) {
- param.groupfd = group->fd;
- if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
- error_report("vfio: failed to setup fd %d "
- "for a group with fd %d: %s",
- param.tablefd, param.groupfd,
- strerror(errno));
- return 0;
- }
- trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
- }
- }
- }
-#endif
- return 0;
-}
-
-static void vfio_container_del_section_window(VFIOContainer *container,
- MemoryRegionSection *section)
-{
- if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
- return;
- }
-
- vfio_spapr_remove_window(container,
- section->offset_within_address_space);
- if (vfio_host_win_del(container,
- section->offset_within_address_space,
- section->offset_within_address_space +
- int128_get64(section->size) - 1) < 0) {
- hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
- __func__, section->offset_within_address_space);
- }
-}
-
static void vfio_listener_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
@@ -984,26 +653,6 @@ static void vfio_listener_region_del(MemoryListener *listener,
vfio_container_del_section_window(container, section);
}
-static void vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
-{
- int ret;
- struct vfio_iommu_type1_dirty_bitmap dirty = {
- .argsz = sizeof(dirty),
- };
-
- if (start) {
- dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
- } else {
- dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
- }
-
- ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
- if (ret) {
- error_report("Failed to set dirty tracking flag 0x%x errno: %d",
- dirty.flags, errno);
- }
-}
-
static void vfio_listener_log_global_start(MemoryListener *listener)
{
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
@@ -1018,58 +667,6 @@ static void vfio_listener_log_global_stop(MemoryListener *listener)
vfio_set_dirty_page_tracking(container, false);
}
-static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
- uint64_t size, ram_addr_t ram_addr)
-{
- struct vfio_iommu_type1_dirty_bitmap *dbitmap;
- struct vfio_iommu_type1_dirty_bitmap_get *range;
- uint64_t pages;
- int ret;
-
- dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
-
- dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
- dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP;
- range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data;
- range->iova = iova;
- range->size = size;
-
- /*
- * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
- * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize
- * to qemu_real_host_page_size.
- */
- range->bitmap.pgsize = qemu_real_host_page_size();
-
- pages = REAL_HOST_PAGE_ALIGN(range->size) / qemu_real_host_page_size();
- range->bitmap.size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) /
- BITS_PER_BYTE;
- range->bitmap.data = g_try_malloc0(range->bitmap.size);
- if (!range->bitmap.data) {
- ret = -ENOMEM;
- goto err_out;
- }
-
- ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
- if (ret) {
- error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
- " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
- (uint64_t)range->size, errno);
- goto err_out;
- }
-
- cpu_physical_memory_set_dirty_lebitmap((unsigned long *)range->bitmap.data,
- ram_addr, pages);
-
- trace_vfio_get_dirty_bitmap(container->fd, range->iova, range->size,
- range->bitmap.size, ram_addr);
-err_out:
- g_free(range->bitmap.data);
- g_free(dbitmap);
-
- return ret;
-}
-
typedef struct {
IOMMUNotifier n;
VFIOGuestIOMMU *giommu;
@@ -1209,7 +806,7 @@ static void vfio_listener_log_sync(MemoryListener *listener,
}
}
-static const MemoryListener vfio_memory_listener = {
+const MemoryListener vfio_memory_listener = {
.name = "vfio",
.region_add = vfio_listener_region_add,
.region_del = vfio_listener_region_del,
@@ -1218,121 +815,7 @@ static const MemoryListener vfio_memory_listener = {
.log_sync = vfio_listener_log_sync,
};
-static void vfio_listener_release(VFIOContainer *container)
-{
- memory_listener_unregister(&container->listener);
- if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
- memory_listener_unregister(&container->prereg_listener);
- }
-}
-
-static struct vfio_info_cap_header *
-vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
-{
- if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
- return NULL;
- }
-
- return vfio_get_cap((void *)info, info->cap_offset, id);
-}
-
-bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
- unsigned int *avail)
-{
- struct vfio_info_cap_header *hdr;
- struct vfio_iommu_type1_info_dma_avail *cap;
-
- /* If the capability cannot be found, assume no DMA limiting */
- hdr = vfio_get_iommu_type1_info_cap(info,
- VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
- if (hdr == NULL) {
- return false;
- }
-
- if (avail != NULL) {
- cap = (void *) hdr;
- *avail = cap->avail;
- }
-
- return true;
-}
-
-void vfio_reset_handler(void *opaque)
-{
- VFIOGroup *group;
- VFIODevice *vbasedev;
-
- QLIST_FOREACH(group, &vfio_group_list, next) {
- QLIST_FOREACH(vbasedev, &group->device_list, next) {
- if (vbasedev->dev->realized) {
- vbasedev->ops->vfio_compute_needs_reset(vbasedev);
- }
- }
- }
-
- QLIST_FOREACH(group, &vfio_group_list, next) {
- QLIST_FOREACH(vbasedev, &group->device_list, next) {
- if (vbasedev->dev->realized && vbasedev->needs_reset) {
- vbasedev->ops->vfio_hot_reset_multi(vbasedev);
- }
- }
- }
-}
-
-static void vfio_kvm_device_add_group(VFIOGroup *group)
-{
-#ifdef CONFIG_KVM
- struct kvm_device_attr attr = {
- .group = KVM_DEV_VFIO_GROUP,
- .attr = KVM_DEV_VFIO_GROUP_ADD,
- .addr = (uint64_t)(unsigned long)&group->fd,
- };
-
- if (!kvm_enabled()) {
- return;
- }
-
- if (vfio_kvm_device_fd < 0) {
- struct kvm_create_device cd = {
- .type = KVM_DEV_TYPE_VFIO,
- };
-
- if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
- error_report("Failed to create KVM VFIO device: %m");
- return;
- }
-
- vfio_kvm_device_fd = cd.fd;
- }
-
- if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
- error_report("Failed to add group %d to KVM VFIO device: %m",
- group->groupid);
- }
-#endif
-}
-
-static void vfio_kvm_device_del_group(VFIOGroup *group)
-{
-#ifdef CONFIG_KVM
- struct kvm_device_attr attr = {
- .group = KVM_DEV_VFIO_GROUP,
- .attr = KVM_DEV_VFIO_GROUP_DEL,
- .addr = (uint64_t)(unsigned long)&group->fd,
- };
-
- if (vfio_kvm_device_fd < 0) {
- return;
- }
-
- if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
- error_report("Failed to remove group %d from KVM VFIO device: %m",
- group->groupid);
- }
-#endif
-}
-
-static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
+VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
{
VFIOAddressSpace *space;
@@ -1352,676 +835,10 @@ static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
return space;
}
-static void vfio_put_address_space(VFIOAddressSpace *space)
+void vfio_put_address_space(VFIOAddressSpace *space)
{
if (QLIST_EMPTY(&space->containers)) {
QLIST_REMOVE(space, list);
g_free(space);
}
}
-
-/*
- * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
- */
-static int vfio_get_iommu_type(VFIOContainer *container,
- Error **errp)
-{
- int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
- VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
- int i;
-
- for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
- if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
- return iommu_types[i];
- }
- }
- error_setg(errp, "No available IOMMU models");
- return -EINVAL;
-}
-
-static int vfio_init_container(VFIOContainer *container, int group_fd,
- Error **errp)
-{
- int iommu_type, ret;
-
- iommu_type = vfio_get_iommu_type(container, errp);
- if (iommu_type < 0) {
- return iommu_type;
- }
-
- ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
- if (ret) {
- error_setg_errno(errp, errno, "Failed to set group container");
- return -errno;
- }
-
- while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
- if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
- /*
- * On sPAPR, despite the IOMMU subdriver always advertises v1 and
- * v2, the running platform may not support v2 and there is no
- * way to guess it until an IOMMU group gets added to the container.
- * So in case it fails with v2, try v1 as a fallback.
- */
- iommu_type = VFIO_SPAPR_TCE_IOMMU;
- continue;
- }
- error_setg_errno(errp, errno, "Failed to set iommu for container");
- return -errno;
- }
-
- container->iommu_type = iommu_type;
- return 0;
-}
-
-static int vfio_get_iommu_info(VFIOContainer *container,
- struct vfio_iommu_type1_info **info)
-{
-
- size_t argsz = sizeof(struct vfio_iommu_type1_info);
-
- *info = g_new0(struct vfio_iommu_type1_info, 1);
-again:
- (*info)->argsz = argsz;
-
- if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
- g_free(*info);
- *info = NULL;
- return -errno;
- }
-
- if (((*info)->argsz > argsz)) {
- argsz = (*info)->argsz;
- *info = g_realloc(*info, argsz);
- goto again;
- }
-
- return 0;
-}
-
-static struct vfio_info_cap_header *
-vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
-{
- struct vfio_info_cap_header *hdr;
- void *ptr = info;
-
- if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
- return NULL;
- }
-
- for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
- if (hdr->id == id) {
- return hdr;
- }
- }
-
- return NULL;
-}
-
-static void vfio_get_iommu_info_migration(VFIOContainer *container,
- struct vfio_iommu_type1_info *info)
-{
- struct vfio_info_cap_header *hdr;
- struct vfio_iommu_type1_info_cap_migration *cap_mig;
-
- hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION);
- if (!hdr) {
- return;
- }
-
- cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration,
- header);
-
- /*
- * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
- * qemu_real_host_page_size to mark those dirty.
- */
- if (cap_mig->pgsize_bitmap & qemu_real_host_page_size()) {
- container->dirty_pages_supported = true;
- container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size;
- container->dirty_pgsizes = cap_mig->pgsize_bitmap;
- }
-}
-
-static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
- Error **errp)
-{
- VFIOContainer *container;
- int ret, fd;
- VFIOAddressSpace *space;
-
- space = vfio_get_address_space(as);
-
- /*
- * VFIO is currently incompatible with discarding of RAM insofar as the
- * madvise to purge (zap) the page from QEMU's address space does not
- * interact with the memory API and therefore leaves stale virtual to
- * physical mappings in the IOMMU if the page was previously pinned. We
- * therefore set discarding broken for each group added to a container,
- * whether the container is used individually or shared. This provides
- * us with options to allow devices within a group to opt-in and allow
- * discarding, so long as it is done consistently for a group (for instance
- * if the device is an mdev device where it is known that the host vendor
- * driver will never pin pages outside of the working set of the guest
- * driver, which would thus not be discarding candidates).
- *
- * The first opportunity to induce pinning occurs here where we attempt to
- * attach the group to existing containers within the AddressSpace. If any
- * pages are already zapped from the virtual address space, such as from
- * previous discards, new pinning will cause valid mappings to be
- * re-established. Likewise, when the overall MemoryListener for a new
- * container is registered, a replay of mappings within the AddressSpace
- * will occur, re-establishing any previously zapped pages as well.
- *
- * Especially virtio-balloon is currently only prevented from discarding
- * new memory, it will not yet set ram_block_discard_set_required() and
- * therefore, neither stops us here or deals with the sudden memory
- * consumption of inflated memory.
- *
- * We do support discarding of memory coordinated via the RamDiscardManager
- * with some IOMMU types. vfio_ram_block_discard_disable() handles the
- * details once we know which type of IOMMU we are using.
- */
-
- QLIST_FOREACH(container, &space->containers, next) {
- if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
- ret = vfio_ram_block_discard_disable(container, true);
- if (ret) {
- error_setg_errno(errp, -ret,
- "Cannot set discarding of RAM broken");
- if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER,
- &container->fd)) {
- error_report("vfio: error disconnecting group %d from"
- " container", group->groupid);
- }
- return ret;
- }
- group->container = container;
- QLIST_INSERT_HEAD(&container->group_list, group, container_next);
- vfio_kvm_device_add_group(group);
- return 0;
- }
- }
-
- fd = qemu_open_old("/dev/vfio/vfio", O_RDWR);
- if (fd < 0) {
- error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
- ret = -errno;
- goto put_space_exit;
- }
-
- ret = ioctl(fd, VFIO_GET_API_VERSION);
- if (ret != VFIO_API_VERSION) {
- error_setg(errp, "supported vfio version: %d, "
- "reported version: %d", VFIO_API_VERSION, ret);
- ret = -EINVAL;
- goto close_fd_exit;
- }
-
- container = g_malloc0(sizeof(*container));
- container->space = space;
- container->fd = fd;
- container->error = NULL;
- container->dirty_pages_supported = false;
- container->dma_max_mappings = 0;
- QLIST_INIT(&container->giommu_list);
- QLIST_INIT(&container->hostwin_list);
- QLIST_INIT(&container->vrdl_list);
-
- ret = vfio_init_container(container, group->fd, errp);
- if (ret) {
- goto free_container_exit;
- }
-
- ret = vfio_ram_block_discard_disable(container, true);
- if (ret) {
- error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
- goto free_container_exit;
- }
-
- switch (container->iommu_type) {
- case VFIO_TYPE1v2_IOMMU:
- case VFIO_TYPE1_IOMMU:
- {
- struct vfio_iommu_type1_info *info;
-
- ret = vfio_get_iommu_info(container, &info);
- if (ret) {
- error_setg_errno(errp, -ret, "Failed to get VFIO IOMMU info");
- goto enable_discards_exit;
- }
-
- if (info->flags & VFIO_IOMMU_INFO_PGSIZES) {
- container->pgsizes = info->iova_pgsizes;
- } else {
- container->pgsizes = qemu_real_host_page_size();
- }
-
- if (!vfio_get_info_dma_avail(info, &container->dma_max_mappings)) {
- container->dma_max_mappings = 65535;
- }
- vfio_get_iommu_info_migration(container, info);
- g_free(info);
-
- /*
- * FIXME: We should parse VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE
- * information to get the actual window extent rather than assume
- * a 64-bit IOVA address space.
- */
- vfio_host_win_add(container, 0, (hwaddr)-1, container->pgsizes);
-
- break;
- }
- case VFIO_SPAPR_TCE_v2_IOMMU:
- case VFIO_SPAPR_TCE_IOMMU:
- {
- struct vfio_iommu_spapr_tce_info info;
- bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
-
- /*
- * The host kernel code implementing VFIO_IOMMU_DISABLE is called
- * when container fd is closed so we do not call it explicitly
- * in this file.
- */
- if (!v2) {
- ret = ioctl(fd, VFIO_IOMMU_ENABLE);
- if (ret) {
- error_setg_errno(errp, errno, "failed to enable container");
- ret = -errno;
- goto enable_discards_exit;
- }
- } else {
- container->prereg_listener = vfio_prereg_listener;
-
- memory_listener_register(&container->prereg_listener,
- &address_space_memory);
- if (container->error) {
- memory_listener_unregister(&container->prereg_listener);
- ret = -1;
- error_propagate_prepend(errp, container->error,
- "RAM memory listener initialization failed: ");
- goto enable_discards_exit;
- }
- }
-
- info.argsz = sizeof(info);
- ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
- if (ret) {
- error_setg_errno(errp, errno,
- "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
- ret = -errno;
- if (v2) {
- memory_listener_unregister(&container->prereg_listener);
- }
- goto enable_discards_exit;
- }
-
- if (v2) {
- container->pgsizes = info.ddw.pgsizes;
- /*
- * There is a default window in just created container.
- * To make region_add/del simpler, we better remove this
- * window now and let those iommu_listener callbacks
- * create/remove them when needed.
- */
- ret = vfio_spapr_remove_window(container, info.dma32_window_start);
- if (ret) {
- error_setg_errno(errp, -ret,
- "failed to remove existing window");
- goto enable_discards_exit;
- }
- } else {
- /* The default table uses 4K pages */
- container->pgsizes = 0x1000;
- vfio_host_win_add(container, info.dma32_window_start,
- info.dma32_window_start +
- info.dma32_window_size - 1,
- 0x1000);
- }
- }
- }
-
- vfio_kvm_device_add_group(group);
-
- QLIST_INIT(&container->group_list);
- QLIST_INSERT_HEAD(&space->containers, container, next);
-
- group->container = container;
- QLIST_INSERT_HEAD(&container->group_list, group, container_next);
-
- container->listener = vfio_memory_listener;
-
- memory_listener_register(&container->listener, container->space->as);
-
- if (container->error) {
- ret = -1;
- error_propagate_prepend(errp, container->error,
- "memory listener initialization failed: ");
- goto listener_release_exit;
- }
-
- container->initialized = true;
-
- return 0;
-listener_release_exit:
- QLIST_REMOVE(group, container_next);
- QLIST_REMOVE(container, next);
- vfio_kvm_device_del_group(group);
- vfio_listener_release(container);
-
-enable_discards_exit:
- vfio_ram_block_discard_disable(container, false);
-
-free_container_exit:
- g_free(container);
-
-close_fd_exit:
- close(fd);
-
-put_space_exit:
- vfio_put_address_space(space);
-
- return ret;
-}
-
-static void vfio_disconnect_container(VFIOGroup *group)
-{
- VFIOContainer *container = group->container;
-
- QLIST_REMOVE(group, container_next);
- group->container = NULL;
-
- /*
- * Explicitly release the listener first before unset container,
- * since unset may destroy the backend container if it's the last
- * group.
- */
- if (QLIST_EMPTY(&container->group_list)) {
- vfio_listener_release(container);
- }
-
- if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
- error_report("vfio: error disconnecting group %d from container",
- group->groupid);
- }
-
- if (QLIST_EMPTY(&container->group_list)) {
- VFIOAddressSpace *space = container->space;
- VFIOGuestIOMMU *giommu, *tmp;
- VFIOHostDMAWindow *hostwin, *next;
-
- QLIST_REMOVE(container, next);
-
- QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
- memory_region_unregister_iommu_notifier(
- MEMORY_REGION(giommu->iommu_mr), &giommu->n);
- QLIST_REMOVE(giommu, giommu_next);
- g_free(giommu);
- }
-
- QLIST_FOREACH_SAFE(hostwin, &container->hostwin_list, hostwin_next,
- next) {
- QLIST_REMOVE(hostwin, hostwin_next);
- g_free(hostwin);
- }
-
- trace_vfio_disconnect_container(container->fd);
- close(container->fd);
- g_free(container);
-
- vfio_put_address_space(space);
- }
-}
-
-VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
-{
- VFIOGroup *group;
- char path[32];
- struct vfio_group_status status = { .argsz = sizeof(status) };
-
- QLIST_FOREACH(group, &vfio_group_list, next) {
- if (group->groupid == groupid) {
- /* Found it. Now is it already in the right context? */
- if (group->container->space->as == as) {
- return group;
- } else {
- error_setg(errp, "group %d used in multiple address spaces",
- group->groupid);
- return NULL;
- }
- }
- }
-
- group = g_malloc0(sizeof(*group));
-
- snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
- group->fd = qemu_open_old(path, O_RDWR);
- if (group->fd < 0) {
- error_setg_errno(errp, errno, "failed to open %s", path);
- goto free_group_exit;
- }
-
- if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
- error_setg_errno(errp, errno, "failed to get group %d status", groupid);
- goto close_fd_exit;
- }
-
- if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
- error_setg(errp, "group %d is not viable", groupid);
- error_append_hint(errp,
- "Please ensure all devices within the iommu_group "
- "are bound to their vfio bus driver.\n");
- goto close_fd_exit;
- }
-
- group->groupid = groupid;
- QLIST_INIT(&group->device_list);
-
- if (vfio_connect_container(group, as, errp)) {
- error_prepend(errp, "failed to setup container for group %d: ",
- groupid);
- goto close_fd_exit;
- }
-
- if (QLIST_EMPTY(&vfio_group_list)) {
- qemu_register_reset(vfio_reset_handler, NULL);
- }
-
- QLIST_INSERT_HEAD(&vfio_group_list, group, next);
-
- return group;
-
-close_fd_exit:
- close(group->fd);
-
-free_group_exit:
- g_free(group);
-
- return NULL;
-}
-
-void vfio_put_group(VFIOGroup *group)
-{
- if (!group || !QLIST_EMPTY(&group->device_list)) {
- return;
- }
-
- if (!group->ram_block_discard_allowed) {
- vfio_ram_block_discard_disable(group->container, false);
- }
- vfio_kvm_device_del_group(group);
- vfio_disconnect_container(group);
- QLIST_REMOVE(group, next);
- trace_vfio_put_group(group->fd);
- close(group->fd);
- g_free(group);
-
- if (QLIST_EMPTY(&vfio_group_list)) {
- qemu_unregister_reset(vfio_reset_handler, NULL);
- }
-}
-
-int vfio_get_device(VFIOGroup *group, const char *name,
- VFIODevice *vbasedev, Error **errp)
-{
- struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
- int ret, fd;
-
- fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
- if (fd < 0) {
- error_setg_errno(errp, errno, "error getting device from group %d",
- group->groupid);
- error_append_hint(errp,
- "Verify all devices in group %d are bound to vfio-<bus> "
- "or pci-stub and not already in use\n", group->groupid);
- return fd;
- }
-
- ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
- if (ret) {
- error_setg_errno(errp, errno, "error getting device info");
- close(fd);
- return ret;
- }
-
- /*
- * Set discarding of RAM as not broken for this group if the driver knows
- * the device operates compatibly with discarding. Setting must be
- * consistent per group, but since compatibility is really only possible
- * with mdev currently, we expect singleton groups.
- */
- if (vbasedev->ram_block_discard_allowed !=
- group->ram_block_discard_allowed) {
- if (!QLIST_EMPTY(&group->device_list)) {
- error_setg(errp, "Inconsistent setting of support for discarding "
- "RAM (e.g., balloon) within group");
- close(fd);
- return -1;
- }
-
- if (!group->ram_block_discard_allowed) {
- group->ram_block_discard_allowed = true;
- vfio_ram_block_discard_disable(group->container, false);
- }
- }
-
- vbasedev->fd = fd;
- vbasedev->group = group;
- QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
-
- vbasedev->num_irqs = dev_info.num_irqs;
- vbasedev->num_regions = dev_info.num_regions;
- vbasedev->flags = dev_info.flags;
-
- trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions,
- dev_info.num_irqs);
-
- vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
- return 0;
-}
-
-void vfio_put_base_device(VFIODevice *vbasedev)
-{
- if (!vbasedev->group) {
- return;
- }
- QLIST_REMOVE(vbasedev, next);
- vbasedev->group = NULL;
- trace_vfio_put_base_device(vbasedev->fd);
- close(vbasedev->fd);
-}
-
-/*
- * Interfaces for IBM EEH (Enhanced Error Handling)
- */
-static bool vfio_eeh_container_ok(VFIOContainer *container)
-{
- /*
- * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
- * implementation is broken if there are multiple groups in a
- * container. The hardware works in units of Partitionable
- * Endpoints (== IOMMU groups) and the EEH operations naively
- * iterate across all groups in the container, without any logic
- * to make sure the groups have their state synchronized. For
- * certain operations (ENABLE) that might be ok, until an error
- * occurs, but for others (GET_STATE) it's clearly broken.
- */
-
- /*
- * XXX Once fixed kernels exist, test for them here
- */
-
- if (QLIST_EMPTY(&container->group_list)) {
- return false;
- }
-
- if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
- return false;
- }
-
- return true;
-}
-
-static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
-{
- struct vfio_eeh_pe_op pe_op = {
- .argsz = sizeof(pe_op),
- .op = op,
- };
- int ret;
-
- if (!vfio_eeh_container_ok(container)) {
- error_report("vfio/eeh: EEH_PE_OP 0x%x: "
- "kernel requires a container with exactly one group", op);
- return -EPERM;
- }
-
- ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
- if (ret < 0) {
- error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
- return -errno;
- }
-
- return ret;
-}
-
-static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
-{
- VFIOAddressSpace *space = vfio_get_address_space(as);
- VFIOContainer *container = NULL;
-
- if (QLIST_EMPTY(&space->containers)) {
- /* No containers to act on */
- goto out;
- }
-
- container = QLIST_FIRST(&space->containers);
-
- if (QLIST_NEXT(container, next)) {
- /* We don't yet have logic to synchronize EEH state across
- * multiple containers */
- container = NULL;
- goto out;
- }
-
-out:
- vfio_put_address_space(space);
- return container;
-}
-
-bool vfio_eeh_as_ok(AddressSpace *as)
-{
- VFIOContainer *container = vfio_eeh_as_container(as);
-
- return (container != NULL) && vfio_eeh_container_ok(container);
-}
-
-int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
-{
- VFIOContainer *container = vfio_eeh_as_container(as);
-
- if (!container) {
- return -ENODEV;
- }
- return vfio_eeh_container_op(container, op);
-}
new file mode 100644
@@ -0,0 +1,1225 @@
+/*
+ * generic functions used by VFIO devices
+ *
+ * Copyright Red Hat, Inc. 2012
+ *
+ * Authors:
+ * Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ * Based on qemu-kvm device-assignment:
+ * Adapted for KVM by Qumranet.
+ * Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
+ * Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
+ * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
+ * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
+ * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
+ */
+
+#include "qemu/osdep.h"
+#include <sys/ioctl.h>
+#ifdef CONFIG_KVM
+#include <linux/kvm.h>
+#endif
+#include <linux/vfio.h>
+
+#include "hw/vfio/vfio-common.h"
+#include "hw/vfio/vfio.h"
+#include "exec/address-spaces.h"
+#include "exec/memory.h"
+#include "exec/ram_addr.h"
+#include "hw/hw.h"
+#include "qemu/error-report.h"
+#include "qemu/range.h"
+#include "sysemu/kvm.h"
+#include "sysemu/reset.h"
+#include "trace.h"
+#include "qapi/error.h"
+#include "migration/migration.h"
+
+VFIOGroupList vfio_group_list =
+ QLIST_HEAD_INITIALIZER(vfio_group_list);
+
+#ifdef CONFIG_KVM
+/*
+ * We have a single VFIO pseudo device per KVM VM. Once created it lives
+ * for the life of the VM. Closing the file descriptor only drops our
+ * reference to it and the device's reference to kvm. Therefore once
+ * initialized, this file descriptor is only released on QEMU exit and
+ * we'll re-use it should another vfio device be attached before then.
+ */
+static int vfio_kvm_device_fd = -1;
+#endif
+
+static int vfio_ram_block_discard_disable(VFIOContainer *container, bool state)
+{
+ switch (container->iommu_type) {
+ case VFIO_TYPE1v2_IOMMU:
+ case VFIO_TYPE1_IOMMU:
+ /*
+ * We support coordinated discarding of RAM via the RamDiscardManager.
+ */
+ return ram_block_uncoordinated_discard_disable(state);
+ default:
+ /*
+ * VFIO_SPAPR_TCE_IOMMU most probably works just fine with
+ * RamDiscardManager, however, it is completely untested.
+ *
+ * VFIO_SPAPR_TCE_v2_IOMMU with "DMA memory preregistering" does
+ * completely the opposite of managing mapping/pinning dynamically as
+ * required by RamDiscardManager. We would have to special-case sections
+ * with a RamDiscardManager.
+ */
+ return ram_block_discard_disable(state);
+ }
+}
+
+/*
+ * Device state interfaces
+ */
+
+bool vfio_mig_active(void)
+{
+ VFIOGroup *group;
+ VFIODevice *vbasedev;
+
+ if (QLIST_EMPTY(&vfio_group_list)) {
+ return false;
+ }
+
+ QLIST_FOREACH(group, &vfio_group_list, next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (vbasedev->migration_blocker) {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
+{
+ VFIOGroup *group;
+ VFIODevice *vbasedev;
+ MigrationState *ms = migrate_get_current();
+
+ if (!migration_is_setup_or_active(ms->state)) {
+ return false;
+ }
+
+ QLIST_FOREACH(group, &container->group_list, container_next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ VFIOMigration *migration = vbasedev->migration;
+
+ if (!migration) {
+ return false;
+ }
+
+ if ((vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF)
+ && (migration->device_state & VFIO_DEVICE_STATE_V1_RUNNING)) {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+bool vfio_devices_all_running_and_saving(VFIOContainer *container)
+{
+ VFIOGroup *group;
+ VFIODevice *vbasedev;
+ MigrationState *ms = migrate_get_current();
+
+ if (!migration_is_setup_or_active(ms->state)) {
+ return false;
+ }
+
+ QLIST_FOREACH(group, &container->group_list, container_next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ VFIOMigration *migration = vbasedev->migration;
+
+ if (!migration) {
+ return false;
+ }
+
+ if ((migration->device_state & VFIO_DEVICE_STATE_V1_SAVING) &&
+ (migration->device_state & VFIO_DEVICE_STATE_V1_RUNNING)) {
+ continue;
+ } else {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+static int vfio_dma_unmap_bitmap(VFIOContainer *container,
+ hwaddr iova, ram_addr_t size,
+ IOMMUTLBEntry *iotlb)
+{
+ struct vfio_iommu_type1_dma_unmap *unmap;
+ struct vfio_bitmap *bitmap;
+ uint64_t pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size();
+ int ret;
+
+ unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
+
+ unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
+ unmap->iova = iova;
+ unmap->size = size;
+ unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP;
+ bitmap = (struct vfio_bitmap *)&unmap->data;
+
+ /*
+ * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
+ * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize
+ * to qemu_real_host_page_size.
+ */
+
+ bitmap->pgsize = qemu_real_host_page_size();
+ bitmap->size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) /
+ BITS_PER_BYTE;
+
+ if (bitmap->size > container->max_dirty_bitmap_size) {
+ error_report("UNMAP: Size of bitmap too big 0x%"PRIx64,
+ (uint64_t)bitmap->size);
+ ret = -E2BIG;
+ goto unmap_exit;
+ }
+
+ bitmap->data = g_try_malloc0(bitmap->size);
+ if (!bitmap->data) {
+ ret = -ENOMEM;
+ goto unmap_exit;
+ }
+
+ ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
+ if (!ret) {
+ cpu_physical_memory_set_dirty_lebitmap((unsigned long *)bitmap->data,
+ iotlb->translated_addr, pages);
+ } else {
+ error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
+ }
+
+ g_free(bitmap->data);
+unmap_exit:
+ g_free(unmap);
+ return ret;
+}
+
+/*
+ * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
+ */
+int vfio_dma_unmap(VFIOContainer *container,
+ hwaddr iova, ram_addr_t size,
+ IOMMUTLBEntry *iotlb)
+{
+ struct vfio_iommu_type1_dma_unmap unmap = {
+ .argsz = sizeof(unmap),
+ .flags = 0,
+ .iova = iova,
+ .size = size,
+ };
+
+ if (iotlb && container->dirty_pages_supported &&
+ vfio_devices_all_running_and_saving(container)) {
+ return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
+ }
+
+ while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
+ /*
+ * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
+ * v4.15) where an overflow in its wrap-around check prevents us from
+ * unmapping the last page of the address space. Test for the error
+ * condition and re-try the unmap excluding the last page. The
+ * expectation is that we've never mapped the last page anyway and this
+ * unmap request comes via vIOMMU support which also makes it unlikely
+ * that this page is used. This bug was introduced well after type1 v2
+ * support was introduced, so we shouldn't need to test for v1. A fix
+ * is queued for kernel v5.0 so this workaround can be removed once
+ * affected kernels are sufficiently deprecated.
+ */
+ if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
+ container->iommu_type == VFIO_TYPE1v2_IOMMU) {
+ trace_vfio_dma_unmap_overflow_workaround();
+ unmap.size -= 1ULL << ctz64(container->pgsizes);
+ continue;
+ }
+ error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
+ return -errno;
+ }
+
+ return 0;
+}
+
+int vfio_dma_map(VFIOContainer *container, hwaddr iova,
+ ram_addr_t size, void *vaddr, bool readonly)
+{
+ struct vfio_iommu_type1_dma_map map = {
+ .argsz = sizeof(map),
+ .flags = VFIO_DMA_MAP_FLAG_READ,
+ .vaddr = (__u64)(uintptr_t)vaddr,
+ .iova = iova,
+ .size = size,
+ };
+
+ if (!readonly) {
+ map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
+ }
+
+ /*
+ * Try the mapping, if it fails with EBUSY, unmap the region and try
+ * again. This shouldn't be necessary, but we sometimes see it in
+ * the VGA ROM space.
+ */
+ if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
+ (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 &&
+ ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
+ return 0;
+ }
+
+ error_report("VFIO_MAP_DMA failed: %s", strerror(errno));
+ return -errno;
+}
+
+void vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
+{
+ int ret;
+ struct vfio_iommu_type1_dirty_bitmap dirty = {
+ .argsz = sizeof(dirty),
+ };
+
+ if (start) {
+ dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
+ } else {
+ dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
+ }
+
+ ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
+ if (ret) {
+ error_report("Failed to set dirty tracking flag 0x%x errno: %d",
+ dirty.flags, errno);
+ }
+}
+
+int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
+ uint64_t size, ram_addr_t ram_addr)
+{
+ struct vfio_iommu_type1_dirty_bitmap *dbitmap;
+ struct vfio_iommu_type1_dirty_bitmap_get *range;
+ uint64_t pages;
+ int ret;
+
+ dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
+
+ dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
+ dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP;
+ range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data;
+ range->iova = iova;
+ range->size = size;
+
+ /*
+ * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
+ * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize
+ * to qemu_real_host_page_size.
+ */
+ range->bitmap.pgsize = qemu_real_host_page_size();
+
+ pages = REAL_HOST_PAGE_ALIGN(range->size) / qemu_real_host_page_size();
+ range->bitmap.size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) /
+ BITS_PER_BYTE;
+ range->bitmap.data = g_try_malloc0(range->bitmap.size);
+ if (!range->bitmap.data) {
+ ret = -ENOMEM;
+ goto err_out;
+ }
+
+ ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
+ if (ret) {
+ error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
+ " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
+ (uint64_t)range->size, errno);
+ goto err_out;
+ }
+
+ cpu_physical_memory_set_dirty_lebitmap((unsigned long *)range->bitmap.data,
+ ram_addr, pages);
+
+ trace_vfio_get_dirty_bitmap(container->fd, range->iova, range->size,
+ range->bitmap.size, ram_addr);
+err_out:
+ g_free(range->bitmap.data);
+ g_free(dbitmap);
+
+ return ret;
+}
+
+static void vfio_listener_release(VFIOContainer *container)
+{
+ memory_listener_unregister(&container->listener);
+ if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
+ memory_listener_unregister(&container->prereg_listener);
+ }
+}
+
+int vfio_container_add_section_window(VFIOContainer *container,
+ MemoryRegionSection *section,
+ Error **errp)
+{
+ VFIOHostDMAWindow *hostwin;
+ hwaddr pgsize = 0;
+ int ret;
+
+ if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
+ return 0;
+ }
+
+ /* For now intersections are not allowed, we may relax this later */
+ QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
+ if (ranges_overlap(hostwin->min_iova,
+ hostwin->max_iova - hostwin->min_iova + 1,
+ section->offset_within_address_space,
+ int128_get64(section->size))) {
+ error_setg(errp,
+ "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing"
+ "host DMA window [0x%"PRIx64",0x%"PRIx64"]",
+ section->offset_within_address_space,
+ section->offset_within_address_space +
+ int128_get64(section->size) - 1,
+ hostwin->min_iova, hostwin->max_iova);
+ return -EINVAL;
+ }
+ }
+
+ ret = vfio_spapr_create_window(container, section, &pgsize);
+ if (ret) {
+ error_setg_errno(errp, -ret, "Failed to create SPAPR window");
+ return ret;
+ }
+
+ vfio_host_win_add(container, section->offset_within_address_space,
+ section->offset_within_address_space +
+ int128_get64(section->size) - 1, pgsize);
+#ifdef CONFIG_KVM
+ if (kvm_enabled()) {
+ VFIOGroup *group;
+ IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
+ struct kvm_vfio_spapr_tce param;
+ struct kvm_device_attr attr = {
+ .group = KVM_DEV_VFIO_GROUP,
+ .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
+ .addr = (uint64_t)(unsigned long)¶m,
+ };
+
+ if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
+ ¶m.tablefd)) {
+ QLIST_FOREACH(group, &container->group_list, container_next) {
+ param.groupfd = group->fd;
+ if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
+ error_report("vfio: failed to setup fd %d "
+ "for a group with fd %d: %s",
+ param.tablefd, param.groupfd,
+ strerror(errno));
+ return 0;
+ }
+ trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
+ }
+ }
+ }
+#endif
+ return 0;
+}
+
+void vfio_container_del_section_window(VFIOContainer *container,
+ MemoryRegionSection *section)
+{
+ if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
+ return;
+ }
+
+ vfio_spapr_remove_window(container,
+ section->offset_within_address_space);
+ if (vfio_host_win_del(container,
+ section->offset_within_address_space,
+ section->offset_within_address_space +
+ int128_get64(section->size) - 1) < 0) {
+ hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
+ __func__, section->offset_within_address_space);
+ }
+}
+
+static struct vfio_info_cap_header *
+vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
+{
+ if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
+ return NULL;
+ }
+
+ return vfio_get_cap((void *)info, info->cap_offset, id);
+}
+
+bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
+ unsigned int *avail)
+{
+ struct vfio_info_cap_header *hdr;
+ struct vfio_iommu_type1_info_dma_avail *cap;
+
+ /* If the capability cannot be found, assume no DMA limiting */
+ hdr = vfio_get_iommu_type1_info_cap(info,
+ VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
+ if (hdr == NULL) {
+ return false;
+ }
+
+ if (avail != NULL) {
+ cap = (void *) hdr;
+ *avail = cap->avail;
+ }
+
+ return true;
+}
+
+void vfio_reset_handler(void *opaque)
+{
+ VFIOGroup *group;
+ VFIODevice *vbasedev;
+
+ QLIST_FOREACH(group, &vfio_group_list, next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (vbasedev->dev->realized) {
+ vbasedev->ops->vfio_compute_needs_reset(vbasedev);
+ }
+ }
+ }
+
+ QLIST_FOREACH(group, &vfio_group_list, next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (vbasedev->dev->realized && vbasedev->needs_reset) {
+ vbasedev->ops->vfio_hot_reset_multi(vbasedev);
+ }
+ }
+ }
+}
+
+static void vfio_kvm_device_add_group(VFIOGroup *group)
+{
+#ifdef CONFIG_KVM
+ struct kvm_device_attr attr = {
+ .group = KVM_DEV_VFIO_GROUP,
+ .attr = KVM_DEV_VFIO_GROUP_ADD,
+ .addr = (uint64_t)(unsigned long)&group->fd,
+ };
+
+ if (!kvm_enabled()) {
+ return;
+ }
+
+ if (vfio_kvm_device_fd < 0) {
+ struct kvm_create_device cd = {
+ .type = KVM_DEV_TYPE_VFIO,
+ };
+
+ if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
+ error_report("Failed to create KVM VFIO device: %m");
+ return;
+ }
+
+ vfio_kvm_device_fd = cd.fd;
+ }
+
+ if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
+ error_report("Failed to add group %d to KVM VFIO device: %m",
+ group->groupid);
+ }
+#endif
+}
+
+static void vfio_kvm_device_del_group(VFIOGroup *group)
+{
+#ifdef CONFIG_KVM
+ struct kvm_device_attr attr = {
+ .group = KVM_DEV_VFIO_GROUP,
+ .attr = KVM_DEV_VFIO_GROUP_DEL,
+ .addr = (uint64_t)(unsigned long)&group->fd,
+ };
+
+ if (vfio_kvm_device_fd < 0) {
+ return;
+ }
+
+ if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
+ error_report("Failed to remove group %d from KVM VFIO device: %m",
+ group->groupid);
+ }
+#endif
+}
+
+/*
+ * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
+ */
+static int vfio_get_iommu_type(VFIOContainer *container,
+ Error **errp)
+{
+ int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
+ VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
+ if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
+ return iommu_types[i];
+ }
+ }
+ error_setg(errp, "No available IOMMU models");
+ return -EINVAL;
+}
+
+static int vfio_init_container(VFIOContainer *container, int group_fd,
+ Error **errp)
+{
+ int iommu_type, ret;
+
+ iommu_type = vfio_get_iommu_type(container, errp);
+ if (iommu_type < 0) {
+ return iommu_type;
+ }
+
+ ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
+ if (ret) {
+ error_setg_errno(errp, errno, "Failed to set group container");
+ return -errno;
+ }
+
+ while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
+ if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
+ /*
+ * On sPAPR, despite the IOMMU subdriver always advertises v1 and
+ * v2, the running platform may not support v2 and there is no
+ * way to guess it until an IOMMU group gets added to the container.
+ * So in case it fails with v2, try v1 as a fallback.
+ */
+ iommu_type = VFIO_SPAPR_TCE_IOMMU;
+ continue;
+ }
+ error_setg_errno(errp, errno, "Failed to set iommu for container");
+ return -errno;
+ }
+
+ container->iommu_type = iommu_type;
+ return 0;
+}
+
+static int vfio_get_iommu_info(VFIOContainer *container,
+ struct vfio_iommu_type1_info **info)
+{
+
+ size_t argsz = sizeof(struct vfio_iommu_type1_info);
+
+ *info = g_new0(struct vfio_iommu_type1_info, 1);
+again:
+ (*info)->argsz = argsz;
+
+ if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
+ g_free(*info);
+ *info = NULL;
+ return -errno;
+ }
+
+ if (((*info)->argsz > argsz)) {
+ argsz = (*info)->argsz;
+ *info = g_realloc(*info, argsz);
+ goto again;
+ }
+
+ return 0;
+}
+
+static struct vfio_info_cap_header *
+vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
+{
+ struct vfio_info_cap_header *hdr;
+ void *ptr = info;
+
+ if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
+ return NULL;
+ }
+
+ for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
+ if (hdr->id == id) {
+ return hdr;
+ }
+ }
+
+ return NULL;
+}
+
+static void vfio_get_iommu_info_migration(VFIOContainer *container,
+ struct vfio_iommu_type1_info *info)
+{
+ struct vfio_info_cap_header *hdr;
+ struct vfio_iommu_type1_info_cap_migration *cap_mig;
+
+ hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION);
+ if (!hdr) {
+ return;
+ }
+
+ cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration,
+ header);
+
+ /*
+ * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
+ * qemu_real_host_page_size to mark those dirty.
+ */
+ if (cap_mig->pgsize_bitmap & qemu_real_host_page_size()) {
+ container->dirty_pages_supported = true;
+ container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size;
+ container->dirty_pgsizes = cap_mig->pgsize_bitmap;
+ }
+}
+
+static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
+ Error **errp)
+{
+ VFIOContainer *container;
+ int ret, fd;
+ VFIOAddressSpace *space;
+
+ space = vfio_get_address_space(as);
+
+ /*
+ * VFIO is currently incompatible with discarding of RAM insofar as the
+ * madvise to purge (zap) the page from QEMU's address space does not
+ * interact with the memory API and therefore leaves stale virtual to
+ * physical mappings in the IOMMU if the page was previously pinned. We
+ * therefore set discarding broken for each group added to a container,
+ * whether the container is used individually or shared. This provides
+ * us with options to allow devices within a group to opt-in and allow
+ * discarding, so long as it is done consistently for a group (for instance
+ * if the device is an mdev device where it is known that the host vendor
+ * driver will never pin pages outside of the working set of the guest
+ * driver, which would thus not be discarding candidates).
+ *
+ * The first opportunity to induce pinning occurs here where we attempt to
+ * attach the group to existing containers within the AddressSpace. If any
+ * pages are already zapped from the virtual address space, such as from
+ * previous discards, new pinning will cause valid mappings to be
+ * re-established. Likewise, when the overall MemoryListener for a new
+ * container is registered, a replay of mappings within the AddressSpace
+ * will occur, re-establishing any previously zapped pages as well.
+ *
+ * Especially virtio-balloon is currently only prevented from discarding
+ * new memory, it will not yet set ram_block_discard_set_required() and
+ * therefore, neither stops us here or deals with the sudden memory
+ * consumption of inflated memory.
+ *
+ * We do support discarding of memory coordinated via the RamDiscardManager
+ * with some IOMMU types. vfio_ram_block_discard_disable() handles the
+ * details once we know which type of IOMMU we are using.
+ */
+
+ QLIST_FOREACH(container, &space->containers, next) {
+ if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
+ ret = vfio_ram_block_discard_disable(container, true);
+ if (ret) {
+ error_setg_errno(errp, -ret,
+ "Cannot set discarding of RAM broken");
+ if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER,
+ &container->fd)) {
+ error_report("vfio: error disconnecting group %d from"
+ " container", group->groupid);
+ }
+ return ret;
+ }
+ group->container = container;
+ QLIST_INSERT_HEAD(&container->group_list, group, container_next);
+ vfio_kvm_device_add_group(group);
+ return 0;
+ }
+ }
+
+ fd = qemu_open_old("/dev/vfio/vfio", O_RDWR);
+ if (fd < 0) {
+ error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
+ ret = -errno;
+ goto put_space_exit;
+ }
+
+ ret = ioctl(fd, VFIO_GET_API_VERSION);
+ if (ret != VFIO_API_VERSION) {
+ error_setg(errp, "supported vfio version: %d, "
+ "reported version: %d", VFIO_API_VERSION, ret);
+ ret = -EINVAL;
+ goto close_fd_exit;
+ }
+
+ container = g_malloc0(sizeof(*container));
+ container->space = space;
+ container->fd = fd;
+ container->error = NULL;
+ container->dirty_pages_supported = false;
+ container->dma_max_mappings = 0;
+ QLIST_INIT(&container->giommu_list);
+ QLIST_INIT(&container->hostwin_list);
+ QLIST_INIT(&container->vrdl_list);
+
+ ret = vfio_init_container(container, group->fd, errp);
+ if (ret) {
+ goto free_container_exit;
+ }
+
+ ret = vfio_ram_block_discard_disable(container, true);
+ if (ret) {
+ error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
+ goto free_container_exit;
+ }
+
+ switch (container->iommu_type) {
+ case VFIO_TYPE1v2_IOMMU:
+ case VFIO_TYPE1_IOMMU:
+ {
+ struct vfio_iommu_type1_info *info;
+
+ ret = vfio_get_iommu_info(container, &info);
+ if (ret) {
+ error_setg_errno(errp, -ret, "Failed to get VFIO IOMMU info");
+ goto enable_discards_exit;
+ }
+
+ if (info->flags & VFIO_IOMMU_INFO_PGSIZES) {
+ container->pgsizes = info->iova_pgsizes;
+ } else {
+ container->pgsizes = qemu_real_host_page_size();
+ }
+
+ if (!vfio_get_info_dma_avail(info, &container->dma_max_mappings)) {
+ container->dma_max_mappings = 65535;
+ }
+ vfio_get_iommu_info_migration(container, info);
+ g_free(info);
+
+ /*
+ * FIXME: We should parse VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE
+ * information to get the actual window extent rather than assume
+ * a 64-bit IOVA address space.
+ */
+ vfio_host_win_add(container, 0, (hwaddr)-1, container->pgsizes);
+
+ break;
+ }
+ case VFIO_SPAPR_TCE_v2_IOMMU:
+ case VFIO_SPAPR_TCE_IOMMU:
+ {
+ struct vfio_iommu_spapr_tce_info info;
+ bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
+
+ /*
+ * The host kernel code implementing VFIO_IOMMU_DISABLE is called
+ * when container fd is closed so we do not call it explicitly
+ * in this file.
+ */
+ if (!v2) {
+ ret = ioctl(fd, VFIO_IOMMU_ENABLE);
+ if (ret) {
+ error_setg_errno(errp, errno, "failed to enable container");
+ ret = -errno;
+ goto enable_discards_exit;
+ }
+ } else {
+ container->prereg_listener = vfio_prereg_listener;
+
+ memory_listener_register(&container->prereg_listener,
+ &address_space_memory);
+ if (container->error) {
+ memory_listener_unregister(&container->prereg_listener);
+ ret = -1;
+ error_propagate_prepend(errp, container->error,
+ "RAM memory listener initialization failed: ");
+ goto enable_discards_exit;
+ }
+ }
+
+ info.argsz = sizeof(info);
+ ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
+ if (ret) {
+ error_setg_errno(errp, errno,
+ "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
+ ret = -errno;
+ if (v2) {
+ memory_listener_unregister(&container->prereg_listener);
+ }
+ goto enable_discards_exit;
+ }
+
+ if (v2) {
+ container->pgsizes = info.ddw.pgsizes;
+ /*
+ * There is a default window in just created container.
+ * To make region_add/del simpler, we better remove this
+ * window now and let those iommu_listener callbacks
+ * create/remove them when needed.
+ */
+ ret = vfio_spapr_remove_window(container, info.dma32_window_start);
+ if (ret) {
+ error_setg_errno(errp, -ret,
+ "failed to remove existing window");
+ goto enable_discards_exit;
+ }
+ } else {
+ /* The default table uses 4K pages */
+ container->pgsizes = 0x1000;
+ vfio_host_win_add(container, info.dma32_window_start,
+ info.dma32_window_start +
+ info.dma32_window_size - 1,
+ 0x1000);
+ }
+ }
+ }
+
+ vfio_kvm_device_add_group(group);
+
+ QLIST_INIT(&container->group_list);
+ QLIST_INSERT_HEAD(&space->containers, container, next);
+
+ group->container = container;
+ QLIST_INSERT_HEAD(&container->group_list, group, container_next);
+
+ container->listener = vfio_memory_listener;
+
+ memory_listener_register(&container->listener, container->space->as);
+
+ if (container->error) {
+ ret = -1;
+ error_propagate_prepend(errp, container->error,
+ "memory listener initialization failed: ");
+ goto listener_release_exit;
+ }
+
+ container->initialized = true;
+
+ return 0;
+listener_release_exit:
+ QLIST_REMOVE(group, container_next);
+ QLIST_REMOVE(container, next);
+ vfio_kvm_device_del_group(group);
+ vfio_listener_release(container);
+
+enable_discards_exit:
+ vfio_ram_block_discard_disable(container, false);
+
+free_container_exit:
+ g_free(container);
+
+close_fd_exit:
+ close(fd);
+
+put_space_exit:
+ vfio_put_address_space(space);
+
+ return ret;
+}
+
+static void vfio_disconnect_container(VFIOGroup *group)
+{
+ VFIOContainer *container = group->container;
+
+ QLIST_REMOVE(group, container_next);
+ group->container = NULL;
+
+ /*
+ * Explicitly release the listener first before unset container,
+ * since unset may destroy the backend container if it's the last
+ * group.
+ */
+ if (QLIST_EMPTY(&container->group_list)) {
+ vfio_listener_release(container);
+ }
+
+ if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
+ error_report("vfio: error disconnecting group %d from container",
+ group->groupid);
+ }
+
+ if (QLIST_EMPTY(&container->group_list)) {
+ VFIOAddressSpace *space = container->space;
+ VFIOGuestIOMMU *giommu, *tmp;
+ VFIOHostDMAWindow *hostwin, *next;
+
+ QLIST_REMOVE(container, next);
+
+ QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
+ memory_region_unregister_iommu_notifier(
+ MEMORY_REGION(giommu->iommu_mr), &giommu->n);
+ QLIST_REMOVE(giommu, giommu_next);
+ g_free(giommu);
+ }
+
+ QLIST_FOREACH_SAFE(hostwin, &container->hostwin_list, hostwin_next,
+ next) {
+ QLIST_REMOVE(hostwin, hostwin_next);
+ g_free(hostwin);
+ }
+
+ trace_vfio_disconnect_container(container->fd);
+ close(container->fd);
+ g_free(container);
+
+ vfio_put_address_space(space);
+ }
+}
+
+VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
+{
+ VFIOGroup *group;
+ char path[32];
+ struct vfio_group_status status = { .argsz = sizeof(status) };
+
+ QLIST_FOREACH(group, &vfio_group_list, next) {
+ if (group->groupid == groupid) {
+ /* Found it. Now is it already in the right context? */
+ if (group->container->space->as == as) {
+ return group;
+ } else {
+ error_setg(errp, "group %d used in multiple address spaces",
+ group->groupid);
+ return NULL;
+ }
+ }
+ }
+
+ group = g_malloc0(sizeof(*group));
+
+ snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
+ group->fd = qemu_open_old(path, O_RDWR);
+ if (group->fd < 0) {
+ error_setg_errno(errp, errno, "failed to open %s", path);
+ goto free_group_exit;
+ }
+
+ if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
+ error_setg_errno(errp, errno, "failed to get group %d status", groupid);
+ goto close_fd_exit;
+ }
+
+ if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
+ error_setg(errp, "group %d is not viable", groupid);
+ error_append_hint(errp,
+ "Please ensure all devices within the iommu_group "
+ "are bound to their vfio bus driver.\n");
+ goto close_fd_exit;
+ }
+
+ group->groupid = groupid;
+ QLIST_INIT(&group->device_list);
+
+ if (vfio_connect_container(group, as, errp)) {
+ error_prepend(errp, "failed to setup container for group %d: ",
+ groupid);
+ goto close_fd_exit;
+ }
+
+ if (QLIST_EMPTY(&vfio_group_list)) {
+ qemu_register_reset(vfio_reset_handler, NULL);
+ }
+
+ QLIST_INSERT_HEAD(&vfio_group_list, group, next);
+
+ return group;
+
+close_fd_exit:
+ close(group->fd);
+
+free_group_exit:
+ g_free(group);
+
+ return NULL;
+}
+
+void vfio_put_group(VFIOGroup *group)
+{
+ if (!group || !QLIST_EMPTY(&group->device_list)) {
+ return;
+ }
+
+ if (!group->ram_block_discard_allowed) {
+ vfio_ram_block_discard_disable(group->container, false);
+ }
+ vfio_kvm_device_del_group(group);
+ vfio_disconnect_container(group);
+ QLIST_REMOVE(group, next);
+ trace_vfio_put_group(group->fd);
+ close(group->fd);
+ g_free(group);
+
+ if (QLIST_EMPTY(&vfio_group_list)) {
+ qemu_unregister_reset(vfio_reset_handler, NULL);
+ }
+}
+
+int vfio_get_device(VFIOGroup *group, const char *name,
+ VFIODevice *vbasedev, Error **errp)
+{
+ struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
+ int ret, fd;
+
+ fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
+ if (fd < 0) {
+ error_setg_errno(errp, errno, "error getting device from group %d",
+ group->groupid);
+ error_append_hint(errp,
+ "Verify all devices in group %d are bound to vfio-<bus> "
+ "or pci-stub and not already in use\n", group->groupid);
+ return fd;
+ }
+
+ ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
+ if (ret) {
+ error_setg_errno(errp, errno, "error getting device info");
+ close(fd);
+ return ret;
+ }
+
+ /*
+ * Set discarding of RAM as not broken for this group if the driver knows
+ * the device operates compatibly with discarding. Setting must be
+ * consistent per group, but since compatibility is really only possible
+ * with mdev currently, we expect singleton groups.
+ */
+ if (vbasedev->ram_block_discard_allowed !=
+ group->ram_block_discard_allowed) {
+ if (!QLIST_EMPTY(&group->device_list)) {
+ error_setg(errp, "Inconsistent setting of support for discarding "
+ "RAM (e.g., balloon) within group");
+ close(fd);
+ return -1;
+ }
+
+ if (!group->ram_block_discard_allowed) {
+ group->ram_block_discard_allowed = true;
+ vfio_ram_block_discard_disable(group->container, false);
+ }
+ }
+
+ vbasedev->fd = fd;
+ vbasedev->group = group;
+ QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
+
+ vbasedev->num_irqs = dev_info.num_irqs;
+ vbasedev->num_regions = dev_info.num_regions;
+ vbasedev->flags = dev_info.flags;
+
+ trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions,
+ dev_info.num_irqs);
+
+ vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
+ return 0;
+}
+
+void vfio_put_base_device(VFIODevice *vbasedev)
+{
+ if (!vbasedev->group) {
+ return;
+ }
+ QLIST_REMOVE(vbasedev, next);
+ vbasedev->group = NULL;
+ trace_vfio_put_base_device(vbasedev->fd);
+ close(vbasedev->fd);
+}
+
+/*
+ * Interfaces for IBM EEH (Enhanced Error Handling)
+ */
+static bool vfio_eeh_container_ok(VFIOContainer *container)
+{
+ /*
+ * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
+ * implementation is broken if there are multiple groups in a
+ * container. The hardware works in units of Partitionable
+ * Endpoints (== IOMMU groups) and the EEH operations naively
+ * iterate across all groups in the container, without any logic
+ * to make sure the groups have their state synchronized. For
+ * certain operations (ENABLE) that might be ok, until an error
+ * occurs, but for others (GET_STATE) it's clearly broken.
+ */
+
+ /*
+ * XXX Once fixed kernels exist, test for them here
+ */
+
+ if (QLIST_EMPTY(&container->group_list)) {
+ return false;
+ }
+
+ if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
+ return false;
+ }
+
+ return true;
+}
+
+static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
+{
+ struct vfio_eeh_pe_op pe_op = {
+ .argsz = sizeof(pe_op),
+ .op = op,
+ };
+ int ret;
+
+ if (!vfio_eeh_container_ok(container)) {
+ error_report("vfio/eeh: EEH_PE_OP 0x%x: "
+ "kernel requires a container with exactly one group", op);
+ return -EPERM;
+ }
+
+ ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
+ if (ret < 0) {
+ error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
+ return -errno;
+ }
+
+ return ret;
+}
+
+static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
+{
+ VFIOAddressSpace *space = vfio_get_address_space(as);
+ VFIOContainer *container = NULL;
+
+ if (QLIST_EMPTY(&space->containers)) {
+ /* No containers to act on */
+ goto out;
+ }
+
+ container = QLIST_FIRST(&space->containers);
+
+ if (QLIST_NEXT(container, next)) {
+ /*
+ * We don't yet have logic to synchronize EEH state across
+ * multiple containers
+ */
+ container = NULL;
+ goto out;
+ }
+
+out:
+ vfio_put_address_space(space);
+ return container;
+}
+
+bool vfio_eeh_as_ok(AddressSpace *as)
+{
+ VFIOContainer *container = vfio_eeh_as_container(as);
+
+ return (container != NULL) && vfio_eeh_container_ok(container);
+}
+
+int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
+{
+ VFIOContainer *container = vfio_eeh_as_container(as);
+
+ if (!container) {
+ return -ENODEV;
+ }
+ return vfio_eeh_container_op(container, op);
+}
@@ -2,6 +2,7 @@ vfio_ss = ss.source_set()
vfio_ss.add(files(
'helpers.c',
'common.c',
+ 'container.c',
'spapr.c',
'migration.c',
))