* [PULL 01/17] vfio/common: Fix error reporting in vfio_get_dirty_bitmap()
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
@ 2023-03-07 18:52 ` Alex Williamson
2023-03-07 18:52 ` [PULL 02/17] vfio/common: Fix wrong %m usages Alex Williamson
` (16 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:52 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Avihai Horon <avihaih@nvidia.com>
Return -errno instead of -1 if VFIO_IOMMU_DIRTY_PAGES ioctl fails in
vfio_get_dirty_bitmap().
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-2-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index bab83c0e55cb..9fc305448fa2 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1335,6 +1335,7 @@ static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
if (ret) {
+ ret = -errno;
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);
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 02/17] vfio/common: Fix wrong %m usages
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
2023-03-07 18:52 ` [PULL 01/17] vfio/common: Fix error reporting in vfio_get_dirty_bitmap() Alex Williamson
@ 2023-03-07 18:52 ` Alex Williamson
2023-03-07 18:52 ` [PULL 03/17] vfio/common: Abort migration if dirty log start/stop/sync fails Alex Williamson
` (15 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:52 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Avihai Horon <avihaih@nvidia.com>
There are several places where the %m conversion is used if one of
vfio_dma_map(), vfio_dma_unmap() or vfio_get_dirty_bitmap() fail.
The %m usage in these places is wrong since %m relies on errno value while
the above functions don't report errors via errno.
Fix it by using strerror() with the returned value instead.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-3-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 29 ++++++++++++++++-------------
1 file changed, 16 insertions(+), 13 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 9fc305448fa2..4d26e9cccf91 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -703,17 +703,17 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
read_only);
if (ret) {
error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
- "0x%"HWADDR_PRIx", %p) = %d (%m)",
+ "0x%"HWADDR_PRIx", %p) = %d (%s)",
container, iova,
- iotlb->addr_mask + 1, vaddr, ret);
+ iotlb->addr_mask + 1, vaddr, ret, strerror(-ret));
}
} else {
ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1, iotlb);
if (ret) {
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
- "0x%"HWADDR_PRIx") = %d (%m)",
+ "0x%"HWADDR_PRIx") = %d (%s)",
container, iova,
- iotlb->addr_mask + 1, ret);
+ iotlb->addr_mask + 1, ret, strerror(-ret));
}
}
out:
@@ -1095,8 +1095,9 @@ static void vfio_listener_region_add(MemoryListener *listener,
vaddr, section->readonly);
if (ret) {
error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
- "0x%"HWADDR_PRIx", %p) = %d (%m)",
- container, iova, int128_get64(llsize), vaddr, ret);
+ "0x%"HWADDR_PRIx", %p) = %d (%s)",
+ container, iova, int128_get64(llsize), vaddr, ret,
+ strerror(-ret));
if (memory_region_is_ram_device(section->mr)) {
/* Allow unexpected mappings not to be fatal for RAM devices */
error_report_err(err);
@@ -1228,16 +1229,18 @@ static void vfio_listener_region_del(MemoryListener *listener,
ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL);
if (ret) {
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
- "0x%"HWADDR_PRIx") = %d (%m)",
- container, iova, int128_get64(llsize), ret);
+ "0x%"HWADDR_PRIx") = %d (%s)",
+ container, iova, int128_get64(llsize), ret,
+ strerror(-ret));
}
iova += int128_get64(llsize);
}
ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL);
if (ret) {
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
- "0x%"HWADDR_PRIx") = %d (%m)",
- container, iova, int128_get64(llsize), ret);
+ "0x%"HWADDR_PRIx") = %d (%s)",
+ container, iova, int128_get64(llsize), ret,
+ strerror(-ret));
}
}
@@ -1384,9 +1387,9 @@ static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
translated_addr);
if (ret) {
error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
- "0x%"HWADDR_PRIx") = %d (%m)",
- container, iova,
- iotlb->addr_mask + 1, ret);
+ "0x%"HWADDR_PRIx") = %d (%s)",
+ container, iova, iotlb->addr_mask + 1, ret,
+ strerror(-ret));
}
}
rcu_read_unlock();
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 03/17] vfio/common: Abort migration if dirty log start/stop/sync fails
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
2023-03-07 18:52 ` [PULL 01/17] vfio/common: Fix error reporting in vfio_get_dirty_bitmap() Alex Williamson
2023-03-07 18:52 ` [PULL 02/17] vfio/common: Fix wrong %m usages Alex Williamson
@ 2023-03-07 18:52 ` Alex Williamson
2023-03-07 18:52 ` [PULL 04/17] vfio/common: Add VFIOBitmap and alloc function Alex Williamson
` (14 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:52 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Avihai Horon <avihaih@nvidia.com>
If VFIO dirty pages log start/stop/sync fails during migration,
migration should be aborted as pages dirtied by VFIO devices might not
be reported properly.
This is not the case today, where in such scenario only an error is
printed.
Fix it by aborting migration in the above scenario.
Fixes: 758b96b61d5c ("vfio/migrate: Move switch of dirty tracking into vfio_memory_listener")
Fixes: b6dd6504e303 ("vfio: Add vfio_listener_log_sync to mark dirty pages")
Fixes: 9e7b0442f23a ("vfio: Add ioctl to get dirty pages bitmap during dma unmap")
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-4-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 53 +++++++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 45 insertions(+), 8 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 4d26e9cccf91..4c801513136a 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -42,6 +42,7 @@
#include "migration/migration.h"
#include "migration/misc.h"
#include "migration/blocker.h"
+#include "migration/qemu-file.h"
#include "sysemu/tpm.h"
VFIOGroupList vfio_group_list =
@@ -390,6 +391,19 @@ void vfio_unblock_multiple_devices_migration(void)
multiple_devices_migration_blocker = NULL;
}
+static void vfio_set_migration_error(int err)
+{
+ MigrationState *ms = migrate_get_current();
+
+ if (migration_is_setup_or_active(ms->state)) {
+ WITH_QEMU_LOCK_GUARD(&ms->qemu_file_lock) {
+ if (ms->to_dst_file) {
+ qemu_file_set_error(ms->to_dst_file, err);
+ }
+ }
+ }
+}
+
static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
{
VFIOGroup *group;
@@ -680,6 +694,7 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
if (iotlb->target_as != &address_space_memory) {
error_report("Wrong target AS \"%s\", only system memory is allowed",
iotlb->target_as->name ? iotlb->target_as->name : "none");
+ vfio_set_migration_error(-EINVAL);
return;
}
@@ -714,6 +729,7 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
"0x%"HWADDR_PRIx") = %d (%s)",
container, iova,
iotlb->addr_mask + 1, ret, strerror(-ret));
+ vfio_set_migration_error(ret);
}
}
out:
@@ -1259,7 +1275,7 @@ static void vfio_listener_region_del(MemoryListener *listener,
}
}
-static void vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
+static int vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
{
int ret;
struct vfio_iommu_type1_dirty_bitmap dirty = {
@@ -1267,7 +1283,7 @@ static void vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
};
if (!container->dirty_pages_supported) {
- return;
+ return 0;
}
if (start) {
@@ -1278,23 +1294,34 @@ static void vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
if (ret) {
+ ret = -errno;
error_report("Failed to set dirty tracking flag 0x%x errno: %d",
dirty.flags, errno);
}
+
+ return ret;
}
static void vfio_listener_log_global_start(MemoryListener *listener)
{
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
+ int ret;
- vfio_set_dirty_page_tracking(container, true);
+ ret = vfio_set_dirty_page_tracking(container, true);
+ if (ret) {
+ vfio_set_migration_error(ret);
+ }
}
static void vfio_listener_log_global_stop(MemoryListener *listener)
{
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
+ int ret;
- vfio_set_dirty_page_tracking(container, false);
+ ret = vfio_set_dirty_page_tracking(container, false);
+ if (ret) {
+ vfio_set_migration_error(ret);
+ }
}
static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
@@ -1370,19 +1397,18 @@ static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
VFIOContainer *container = giommu->container;
hwaddr iova = iotlb->iova + giommu->iommu_offset;
ram_addr_t translated_addr;
+ int ret = -EINVAL;
trace_vfio_iommu_map_dirty_notify(iova, iova + iotlb->addr_mask);
if (iotlb->target_as != &address_space_memory) {
error_report("Wrong target AS \"%s\", only system memory is allowed",
iotlb->target_as->name ? iotlb->target_as->name : "none");
- return;
+ goto out;
}
rcu_read_lock();
if (vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL)) {
- int ret;
-
ret = vfio_get_dirty_bitmap(container, iova, iotlb->addr_mask + 1,
translated_addr);
if (ret) {
@@ -1393,6 +1419,11 @@ static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
}
}
rcu_read_unlock();
+
+out:
+ if (ret) {
+ vfio_set_migration_error(ret);
+ }
}
static int vfio_ram_discard_get_dirty_bitmap(MemoryRegionSection *section,
@@ -1485,13 +1516,19 @@ static void vfio_listener_log_sync(MemoryListener *listener,
MemoryRegionSection *section)
{
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
+ int ret;
if (vfio_listener_skipped_section(section)) {
return;
}
if (vfio_devices_all_dirty_tracking(container)) {
- vfio_sync_dirty_bitmap(container, section);
+ ret = vfio_sync_dirty_bitmap(container, section);
+ if (ret) {
+ error_report("vfio: Failed to sync dirty bitmap, err: %d (%s)", ret,
+ strerror(-ret));
+ vfio_set_migration_error(ret);
+ }
}
}
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 04/17] vfio/common: Add VFIOBitmap and alloc function
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (2 preceding siblings ...)
2023-03-07 18:52 ` [PULL 03/17] vfio/common: Abort migration if dirty log start/stop/sync fails Alex Williamson
@ 2023-03-07 18:52 ` Alex Williamson
2023-03-07 18:52 ` [PULL 05/17] vfio/common: Add helper to validate iova/end against hostwin Alex Williamson
` (13 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:52 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Avihai Horon <avihaih@nvidia.com>
There are already two places where dirty page bitmap allocation and
calculations are done in open code.
To avoid code duplication, introduce VFIOBitmap struct and corresponding
alloc function and use them where applicable.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-5-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 73 +++++++++++++++++++++++++++++++++---------------------
1 file changed, 44 insertions(+), 29 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 4c801513136a..cec3de08d2b4 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -320,6 +320,25 @@ const MemoryRegionOps vfio_region_ops = {
* Device state interfaces
*/
+typedef struct {
+ unsigned long *bitmap;
+ hwaddr size;
+ hwaddr pages;
+} VFIOBitmap;
+
+static int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
+{
+ vbmap->pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size();
+ vbmap->size = ROUND_UP(vbmap->pages, sizeof(__u64) * BITS_PER_BYTE) /
+ BITS_PER_BYTE;
+ vbmap->bitmap = g_try_malloc0(vbmap->size);
+ if (!vbmap->bitmap) {
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
bool vfio_mig_active(void)
{
VFIOGroup *group;
@@ -468,9 +487,14 @@ static int vfio_dma_unmap_bitmap(VFIOContainer *container,
{
struct vfio_iommu_type1_dma_unmap *unmap;
struct vfio_bitmap *bitmap;
- uint64_t pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size();
+ VFIOBitmap vbmap;
int ret;
+ ret = vfio_bitmap_alloc(&vbmap, size);
+ if (ret) {
+ return ret;
+ }
+
unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
@@ -484,35 +508,28 @@ static int vfio_dma_unmap_bitmap(VFIOContainer *container,
* 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;
+ bitmap->size = vbmap.size;
+ bitmap->data = (__u64 *)vbmap.bitmap;
- if (bitmap->size > container->max_dirty_bitmap_size) {
- error_report("UNMAP: Size of bitmap too big 0x%"PRIx64,
- (uint64_t)bitmap->size);
+ if (vbmap.size > container->max_dirty_bitmap_size) {
+ error_report("UNMAP: Size of bitmap too big 0x%"PRIx64, vbmap.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);
+ cpu_physical_memory_set_dirty_lebitmap(vbmap.bitmap,
+ iotlb->translated_addr, vbmap.pages);
} else {
error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
}
- g_free(bitmap->data);
unmap_exit:
g_free(unmap);
+ g_free(vbmap.bitmap);
+
return ret;
}
@@ -1329,7 +1346,7 @@ static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
{
struct vfio_iommu_type1_dirty_bitmap *dbitmap;
struct vfio_iommu_type1_dirty_bitmap_get *range;
- uint64_t pages;
+ VFIOBitmap vbmap;
int ret;
if (!container->dirty_pages_supported) {
@@ -1339,6 +1356,11 @@ static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
return 0;
}
+ ret = vfio_bitmap_alloc(&vbmap, size);
+ if (ret) {
+ return ret;
+ }
+
dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
@@ -1353,15 +1375,8 @@ static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
* 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;
- }
+ range->bitmap.size = vbmap.size;
+ range->bitmap.data = (__u64 *)vbmap.bitmap;
ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
if (ret) {
@@ -1372,14 +1387,14 @@ static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
goto err_out;
}
- cpu_physical_memory_set_dirty_lebitmap((unsigned long *)range->bitmap.data,
- ram_addr, pages);
+ cpu_physical_memory_set_dirty_lebitmap(vbmap.bitmap, ram_addr,
+ vbmap.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);
+ g_free(vbmap.bitmap);
return ret;
}
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 05/17] vfio/common: Add helper to validate iova/end against hostwin
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (3 preceding siblings ...)
2023-03-07 18:52 ` [PULL 04/17] vfio/common: Add VFIOBitmap and alloc function Alex Williamson
@ 2023-03-07 18:52 ` Alex Williamson
2023-03-07 18:52 ` [PULL 06/17] vfio/common: Use a single tracepoint for skipped sections Alex Williamson
` (12 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:52 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Joao Martins <joao.m.martins@oracle.com>
Move the code that finds the container host DMA window against a iova
range. This avoids duplication on the common checks across listener
callbacks.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Avihai Horon <avihaih@nvidia.com>
Link: https://lore.kernel.org/r/20230307125450.62409-6-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 38 ++++++++++++++++++++------------------
1 file changed, 20 insertions(+), 18 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index cec3de08d2b4..99acb998eb14 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -901,6 +901,22 @@ static void vfio_unregister_ram_discard_listener(VFIOContainer *container,
g_free(vrdl);
}
+static VFIOHostDMAWindow *vfio_find_hostwin(VFIOContainer *container,
+ hwaddr iova, hwaddr end)
+{
+ VFIOHostDMAWindow *hostwin;
+ bool hostwin_found = false;
+
+ QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
+ if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
+ hostwin_found = true;
+ break;
+ }
+ }
+
+ return hostwin_found ? hostwin : NULL;
+}
+
static bool vfio_known_safe_misalignment(MemoryRegionSection *section)
{
MemoryRegion *mr = section->mr;
@@ -926,7 +942,6 @@ static void vfio_listener_region_add(MemoryListener *listener,
void *vaddr;
int ret;
VFIOHostDMAWindow *hostwin;
- bool hostwin_found;
Error *err = NULL;
if (vfio_listener_skipped_section(section)) {
@@ -1027,15 +1042,8 @@ static void vfio_listener_region_add(MemoryListener *listener,
#endif
}
- hostwin_found = false;
- QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
- if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
- hostwin_found = true;
- break;
- }
- }
-
- if (!hostwin_found) {
+ hostwin = vfio_find_hostwin(container, iova, end);
+ if (!hostwin) {
error_setg(&err, "Container %p can't map guest IOVA region"
" 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end);
goto fail;
@@ -1237,15 +1245,9 @@ static void vfio_listener_region_del(MemoryListener *listener,
if (memory_region_is_ram_device(section->mr)) {
hwaddr pgmask;
VFIOHostDMAWindow *hostwin;
- bool hostwin_found = false;
- QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
- if (hostwin->min_iova <= iova && end <= hostwin->max_iova) {
- hostwin_found = true;
- break;
- }
- }
- assert(hostwin_found); /* or region_add() would have failed */
+ hostwin = vfio_find_hostwin(container, iova, end);
+ assert(hostwin); /* or region_add() would have failed */
pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask));
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 06/17] vfio/common: Use a single tracepoint for skipped sections
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (4 preceding siblings ...)
2023-03-07 18:52 ` [PULL 05/17] vfio/common: Add helper to validate iova/end against hostwin Alex Williamson
@ 2023-03-07 18:52 ` Alex Williamson
2023-03-07 18:52 ` [PULL 07/17] vfio/common: Consolidate skip/invalid section into helper Alex Williamson
` (11 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:52 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Joao Martins <joao.m.martins@oracle.com>
In preparation to turn more of the memory listener checks into
common functions, one of the affected places is how we trace when
sections are skipped. Right now there is one for each. Change it
into one single tracepoint `vfio_listener_region_skip` which receives
a name which refers to the callback i.e. region_add and region_del.
Suggested-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-7-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 4 ++--
hw/vfio/trace-events | 3 +--
2 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 99acb998eb14..1cb62efa9743 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -945,7 +945,7 @@ static void vfio_listener_region_add(MemoryListener *listener,
Error *err = NULL;
if (vfio_listener_skipped_section(section)) {
- trace_vfio_listener_region_add_skip(
+ trace_vfio_listener_region_skip("region_add",
section->offset_within_address_space,
section->offset_within_address_space +
int128_get64(int128_sub(section->size, int128_one())));
@@ -1183,7 +1183,7 @@ static void vfio_listener_region_del(MemoryListener *listener,
bool try_unmap = true;
if (vfio_listener_skipped_section(section)) {
- trace_vfio_listener_region_del_skip(
+ trace_vfio_listener_region_skip("region_del",
section->offset_within_address_space,
section->offset_within_address_space +
int128_get64(int128_sub(section->size, int128_one())));
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index 669d9fe07cd9..7173e6a5c721 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -96,13 +96,12 @@ vfio_pci_igd_lpc_bridge_enabled(const char *name) "%s"
vfio_region_write(const char *name, int index, uint64_t addr, uint64_t data, unsigned size) " (%s:region%d+0x%"PRIx64", 0x%"PRIx64 ", %d)"
vfio_region_read(char *name, int index, uint64_t addr, unsigned size, uint64_t data) " (%s:region%d+0x%"PRIx64", %d) = 0x%"PRIx64
vfio_iommu_map_notify(const char *op, uint64_t iova_start, uint64_t iova_end) "iommu %s @ 0x%"PRIx64" - 0x%"PRIx64
-vfio_listener_region_add_skip(uint64_t start, uint64_t end) "SKIPPING region_add 0x%"PRIx64" - 0x%"PRIx64
+vfio_listener_region_skip(const char *name, uint64_t start, uint64_t end) "SKIPPING %s 0x%"PRIx64" - 0x%"PRIx64
vfio_spapr_group_attach(int groupfd, int tablefd) "Attached groupfd %d to liobn fd %d"
vfio_listener_region_add_iommu(uint64_t start, uint64_t end) "region_add [iommu] 0x%"PRIx64" - 0x%"PRIx64
vfio_listener_region_add_ram(uint64_t iova_start, uint64_t iova_end, void *vaddr) "region_add [ram] 0x%"PRIx64" - 0x%"PRIx64" [%p]"
vfio_known_safe_misalignment(const char *name, uint64_t iova, uint64_t offset_within_region, uintptr_t page_size) "Region \"%s\" iova=0x%"PRIx64" offset_within_region=0x%"PRIx64" qemu_real_host_page_size=0x%"PRIxPTR
vfio_listener_region_add_no_dma_map(const char *name, uint64_t iova, uint64_t size, uint64_t page_size) "Region \"%s\" 0x%"PRIx64" size=0x%"PRIx64" is not aligned to 0x%"PRIx64" and cannot be mapped for DMA"
-vfio_listener_region_del_skip(uint64_t start, uint64_t end) "SKIPPING region_del 0x%"PRIx64" - 0x%"PRIx64
vfio_listener_region_del(uint64_t start, uint64_t end) "region_del 0x%"PRIx64" - 0x%"PRIx64
vfio_disconnect_container(int fd) "close container->fd=%d"
vfio_put_group(int fd) "close group->fd=%d"
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 07/17] vfio/common: Consolidate skip/invalid section into helper
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (5 preceding siblings ...)
2023-03-07 18:52 ` [PULL 06/17] vfio/common: Use a single tracepoint for skipped sections Alex Williamson
@ 2023-03-07 18:52 ` Alex Williamson
2023-03-07 18:53 ` [PULL 08/17] vfio/common: Add helper to consolidate iova/end calculation Alex Williamson
` (10 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:52 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Joao Martins <joao.m.martins@oracle.com>
The checks are replicated against region_add and region_del
and will be soon added in another memory listener dedicated
for dirty tracking.
Move these into a new helper for avoid duplication.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Avihai Horon <avihaih@nvidia.com>
Link: https://lore.kernel.org/r/20230307125450.62409-8-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 55 +++++++++++++++++++++++-------------------------------
1 file changed, 23 insertions(+), 32 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 1cb62efa9743..d38b7c1969b9 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -933,23 +933,15 @@ static bool vfio_known_safe_misalignment(MemoryRegionSection *section)
return true;
}
-static void vfio_listener_region_add(MemoryListener *listener,
- MemoryRegionSection *section)
+static bool vfio_listener_valid_section(MemoryRegionSection *section,
+ const char *name)
{
- VFIOContainer *container = container_of(listener, VFIOContainer, listener);
- hwaddr iova, end;
- Int128 llend, llsize;
- void *vaddr;
- int ret;
- VFIOHostDMAWindow *hostwin;
- Error *err = NULL;
-
if (vfio_listener_skipped_section(section)) {
- trace_vfio_listener_region_skip("region_add",
+ trace_vfio_listener_region_skip(name,
section->offset_within_address_space,
section->offset_within_address_space +
int128_get64(int128_sub(section->size, int128_one())));
- return;
+ return false;
}
if (unlikely((section->offset_within_address_space &
@@ -964,6 +956,24 @@ static void vfio_listener_region_add(MemoryListener *listener,
section->offset_within_region,
qemu_real_host_page_size());
}
+ return false;
+ }
+
+ return true;
+}
+
+static void vfio_listener_region_add(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+ VFIOContainer *container = container_of(listener, VFIOContainer, listener);
+ hwaddr iova, end;
+ Int128 llend, llsize;
+ void *vaddr;
+ int ret;
+ VFIOHostDMAWindow *hostwin;
+ Error *err = NULL;
+
+ if (!vfio_listener_valid_section(section, "region_add")) {
return;
}
@@ -1182,26 +1192,7 @@ static void vfio_listener_region_del(MemoryListener *listener,
int ret;
bool try_unmap = true;
- if (vfio_listener_skipped_section(section)) {
- trace_vfio_listener_region_skip("region_del",
- section->offset_within_address_space,
- section->offset_within_address_space +
- int128_get64(int128_sub(section->size, int128_one())));
- return;
- }
-
- if (unlikely((section->offset_within_address_space &
- ~qemu_real_host_page_mask()) !=
- (section->offset_within_region & ~qemu_real_host_page_mask()))) {
- if (!vfio_known_safe_misalignment(section)) {
- error_report("%s received unaligned region %s iova=0x%"PRIx64
- " offset_within_region=0x%"PRIx64
- " qemu_real_host_page_size=0x%"PRIxPTR,
- __func__, memory_region_name(section->mr),
- section->offset_within_address_space,
- section->offset_within_region,
- qemu_real_host_page_size());
- }
+ if (!vfio_listener_valid_section(section, "region_del")) {
return;
}
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 08/17] vfio/common: Add helper to consolidate iova/end calculation
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (6 preceding siblings ...)
2023-03-07 18:52 ` [PULL 07/17] vfio/common: Consolidate skip/invalid section into helper Alex Williamson
@ 2023-03-07 18:53 ` Alex Williamson
2023-03-07 18:53 ` [PULL 09/17] vfio/common: Record DMA mapped IOVA ranges Alex Williamson
` (9 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:53 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Joao Martins <joao.m.martins@oracle.com>
In preparation to be used in device dirty tracking, move the code that
calculate a iova/end range from the container/section. This avoids
duplication on the common checks across listener callbacks.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-9-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 41 +++++++++++++++++++++++++++--------------
1 file changed, 27 insertions(+), 14 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index d38b7c1969b9..63831eab78a1 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -962,6 +962,31 @@ static bool vfio_listener_valid_section(MemoryRegionSection *section,
return true;
}
+static bool vfio_get_section_iova_range(VFIOContainer *container,
+ MemoryRegionSection *section,
+ hwaddr *out_iova, hwaddr *out_end,
+ Int128 *out_llend)
+{
+ Int128 llend;
+ hwaddr iova;
+
+ iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space);
+ llend = int128_make64(section->offset_within_address_space);
+ llend = int128_add(llend, section->size);
+ llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask()));
+
+ if (int128_ge(int128_make64(iova), llend)) {
+ return false;
+ }
+
+ *out_iova = iova;
+ *out_end = int128_get64(int128_sub(llend, int128_one()));
+ if (out_llend) {
+ *out_llend = llend;
+ }
+ return true;
+}
+
static void vfio_listener_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
@@ -977,12 +1002,7 @@ static void vfio_listener_region_add(MemoryListener *listener,
return;
}
- iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space);
- llend = int128_make64(section->offset_within_address_space);
- llend = int128_add(llend, section->size);
- llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask()));
-
- if (int128_ge(int128_make64(iova), llend)) {
+ if (!vfio_get_section_iova_range(container, section, &iova, &end, &llend)) {
if (memory_region_is_ram_device(section->mr)) {
trace_vfio_listener_region_add_no_dma_map(
memory_region_name(section->mr),
@@ -992,7 +1012,6 @@ static void vfio_listener_region_add(MemoryListener *listener,
}
return;
}
- end = int128_get64(int128_sub(llend, int128_one()));
if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
hwaddr pgsize = 0;
@@ -1219,15 +1238,9 @@ static void vfio_listener_region_del(MemoryListener *listener,
*/
}
- iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space);
- llend = int128_make64(section->offset_within_address_space);
- llend = int128_add(llend, section->size);
- llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask()));
-
- if (int128_ge(int128_make64(iova), llend)) {
+ if (!vfio_get_section_iova_range(container, section, &iova, &end, &llend)) {
return;
}
- end = int128_get64(int128_sub(llend, int128_one()));
llsize = int128_sub(llend, int128_make64(iova));
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 09/17] vfio/common: Record DMA mapped IOVA ranges
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (7 preceding siblings ...)
2023-03-07 18:53 ` [PULL 08/17] vfio/common: Add helper to consolidate iova/end calculation Alex Williamson
@ 2023-03-07 18:53 ` Alex Williamson
2023-03-07 18:53 ` [PULL 10/17] vfio/common: Add device dirty page tracking start/stop Alex Williamson
` (8 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:53 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Joao Martins <joao.m.martins@oracle.com>
According to the device DMA logging uAPI, IOVA ranges to be logged by
the device must be provided all at once upon DMA logging start.
As preparation for the following patches which will add device dirty
page tracking, keep a record of all DMA mapped IOVA ranges so later they
can be used for DMA logging start.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-10-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++
hw/vfio/trace-events | 1 +
2 files changed, 86 insertions(+)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 63831eab78a1..811502dbc97c 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1325,11 +1325,96 @@ static int vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
return ret;
}
+typedef struct VFIODirtyRanges {
+ hwaddr min32;
+ hwaddr max32;
+ hwaddr min64;
+ hwaddr max64;
+} VFIODirtyRanges;
+
+typedef struct VFIODirtyRangesListener {
+ VFIOContainer *container;
+ VFIODirtyRanges ranges;
+ MemoryListener listener;
+} VFIODirtyRangesListener;
+
+static void vfio_dirty_tracking_update(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+ VFIODirtyRangesListener *dirty = container_of(listener,
+ VFIODirtyRangesListener,
+ listener);
+ VFIODirtyRanges *range = &dirty->ranges;
+ hwaddr iova, end, *min, *max;
+
+ if (!vfio_listener_valid_section(section, "tracking_update") ||
+ !vfio_get_section_iova_range(dirty->container, section,
+ &iova, &end, NULL)) {
+ return;
+ }
+
+ /*
+ * The address space passed to the dirty tracker is reduced to two ranges:
+ * one for 32-bit DMA ranges, and another one for 64-bit DMA ranges.
+ * The underlying reports of dirty will query a sub-interval of each of
+ * these ranges.
+ *
+ * The purpose of the dual range handling is to handle known cases of big
+ * holes in the address space, like the x86 AMD 1T hole. The alternative
+ * would be an IOVATree but that has a much bigger runtime overhead and
+ * unnecessary complexity.
+ */
+ min = (end <= UINT32_MAX) ? &range->min32 : &range->min64;
+ max = (end <= UINT32_MAX) ? &range->max32 : &range->max64;
+
+ if (*min > iova) {
+ *min = iova;
+ }
+ if (*max < end) {
+ *max = end;
+ }
+
+ trace_vfio_device_dirty_tracking_update(iova, end, *min, *max);
+ return;
+}
+
+static const MemoryListener vfio_dirty_tracking_listener = {
+ .name = "vfio-tracking",
+ .region_add = vfio_dirty_tracking_update,
+};
+
+static void vfio_dirty_tracking_init(VFIOContainer *container,
+ VFIODirtyRanges *ranges)
+{
+ VFIODirtyRangesListener dirty;
+
+ memset(&dirty, 0, sizeof(dirty));
+ dirty.ranges.min32 = UINT32_MAX;
+ dirty.ranges.min64 = UINT64_MAX;
+ dirty.listener = vfio_dirty_tracking_listener;
+ dirty.container = container;
+
+ memory_listener_register(&dirty.listener,
+ container->space->as);
+
+ *ranges = dirty.ranges;
+
+ /*
+ * The memory listener is synchronous, and used to calculate the range
+ * to dirty tracking. Unregister it after we are done as we are not
+ * interested in any follow-up updates.
+ */
+ memory_listener_unregister(&dirty.listener);
+}
+
static void vfio_listener_log_global_start(MemoryListener *listener)
{
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
+ VFIODirtyRanges ranges;
int ret;
+ vfio_dirty_tracking_init(container, &ranges);
+
ret = vfio_set_dirty_page_tracking(container, true);
if (ret) {
vfio_set_migration_error(ret);
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index 7173e6a5c721..dd9fd7b9bddb 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -103,6 +103,7 @@ vfio_listener_region_add_ram(uint64_t iova_start, uint64_t iova_end, void *vaddr
vfio_known_safe_misalignment(const char *name, uint64_t iova, uint64_t offset_within_region, uintptr_t page_size) "Region \"%s\" iova=0x%"PRIx64" offset_within_region=0x%"PRIx64" qemu_real_host_page_size=0x%"PRIxPTR
vfio_listener_region_add_no_dma_map(const char *name, uint64_t iova, uint64_t size, uint64_t page_size) "Region \"%s\" 0x%"PRIx64" size=0x%"PRIx64" is not aligned to 0x%"PRIx64" and cannot be mapped for DMA"
vfio_listener_region_del(uint64_t start, uint64_t end) "region_del 0x%"PRIx64" - 0x%"PRIx64
+vfio_device_dirty_tracking_update(uint64_t start, uint64_t end, uint64_t min, uint64_t max) "section 0x%"PRIx64" - 0x%"PRIx64" -> update [0x%"PRIx64" - 0x%"PRIx64"]"
vfio_disconnect_container(int fd) "close container->fd=%d"
vfio_put_group(int fd) "close group->fd=%d"
vfio_get_device(const char * name, unsigned int flags, unsigned int num_regions, unsigned int num_irqs) "Device %s flags: %u, regions: %u, irqs: %u"
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 10/17] vfio/common: Add device dirty page tracking start/stop
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (8 preceding siblings ...)
2023-03-07 18:53 ` [PULL 09/17] vfio/common: Record DMA mapped IOVA ranges Alex Williamson
@ 2023-03-07 18:53 ` Alex Williamson
2023-03-07 18:53 ` [PULL 11/17] vfio/common: Extract code from vfio_get_dirty_bitmap() to new function Alex Williamson
` (7 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:53 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Joao Martins <joao.m.martins@oracle.com>
Add device dirty page tracking start/stop functionality. This uses the
device DMA logging uAPI to start and stop dirty page tracking by device.
Device dirty page tracking is used only if all devices within a
container support device dirty page tracking.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Link: https://lore.kernel.org/r/20230307125450.62409-11-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 173 ++++++++++++++++++++++++++++++++++++++++-
hw/vfio/trace-events | 1
include/hw/vfio/vfio-common.h | 2
3 files changed, 171 insertions(+), 5 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 811502dbc97c..55498afeb255 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -450,6 +450,22 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
return true;
}
+static bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container)
+{
+ VFIOGroup *group;
+ VFIODevice *vbasedev;
+
+ QLIST_FOREACH(group, &container->group_list, container_next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (!vbasedev->dirty_pages_supported) {
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
+
/*
* Check if all VFIO devices are running and migration is active, which is
* essentially equivalent to the migration being in pre-copy phase.
@@ -1407,16 +1423,156 @@ static void vfio_dirty_tracking_init(VFIOContainer *container,
memory_listener_unregister(&dirty.listener);
}
+static void vfio_devices_dma_logging_stop(VFIOContainer *container)
+{
+ uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature),
+ sizeof(uint64_t))] = {};
+ struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
+ VFIODevice *vbasedev;
+ VFIOGroup *group;
+
+ feature->argsz = sizeof(buf);
+ feature->flags = VFIO_DEVICE_FEATURE_SET |
+ VFIO_DEVICE_FEATURE_DMA_LOGGING_STOP;
+
+ QLIST_FOREACH(group, &container->group_list, container_next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (!vbasedev->dirty_tracking) {
+ continue;
+ }
+
+ if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
+ warn_report("%s: Failed to stop DMA logging, err %d (%s)",
+ vbasedev->name, -errno, strerror(errno));
+ }
+ vbasedev->dirty_tracking = false;
+ }
+ }
+}
+
+static struct vfio_device_feature *
+vfio_device_feature_dma_logging_start_create(VFIOContainer *container,
+ VFIODirtyRanges *tracking)
+{
+ struct vfio_device_feature *feature;
+ size_t feature_size;
+ struct vfio_device_feature_dma_logging_control *control;
+ struct vfio_device_feature_dma_logging_range *ranges;
+
+ feature_size = sizeof(struct vfio_device_feature) +
+ sizeof(struct vfio_device_feature_dma_logging_control);
+ feature = g_try_malloc0(feature_size);
+ if (!feature) {
+ errno = ENOMEM;
+ return NULL;
+ }
+ feature->argsz = feature_size;
+ feature->flags = VFIO_DEVICE_FEATURE_SET |
+ VFIO_DEVICE_FEATURE_DMA_LOGGING_START;
+
+ control = (struct vfio_device_feature_dma_logging_control *)feature->data;
+ control->page_size = qemu_real_host_page_size();
+
+ /*
+ * DMA logging uAPI guarantees to support at least a number of ranges that
+ * fits into a single host kernel base page.
+ */
+ control->num_ranges = !!tracking->max32 + !!tracking->max64;
+ ranges = g_try_new0(struct vfio_device_feature_dma_logging_range,
+ control->num_ranges);
+ if (!ranges) {
+ g_free(feature);
+ errno = ENOMEM;
+
+ return NULL;
+ }
+
+ control->ranges = (__u64)(uintptr_t)ranges;
+ if (tracking->max32) {
+ ranges->iova = tracking->min32;
+ ranges->length = (tracking->max32 - tracking->min32) + 1;
+ ranges++;
+ }
+ if (tracking->max64) {
+ ranges->iova = tracking->min64;
+ ranges->length = (tracking->max64 - tracking->min64) + 1;
+ }
+
+ trace_vfio_device_dirty_tracking_start(control->num_ranges,
+ tracking->min32, tracking->max32,
+ tracking->min64, tracking->max64);
+
+ return feature;
+}
+
+static void vfio_device_feature_dma_logging_start_destroy(
+ struct vfio_device_feature *feature)
+{
+ struct vfio_device_feature_dma_logging_control *control =
+ (struct vfio_device_feature_dma_logging_control *)feature->data;
+ struct vfio_device_feature_dma_logging_range *ranges =
+ (struct vfio_device_feature_dma_logging_range *)(uintptr_t)control->ranges;
+
+ g_free(ranges);
+ g_free(feature);
+}
+
+static int vfio_devices_dma_logging_start(VFIOContainer *container)
+{
+ struct vfio_device_feature *feature;
+ VFIODirtyRanges ranges;
+ VFIODevice *vbasedev;
+ VFIOGroup *group;
+ int ret = 0;
+
+ vfio_dirty_tracking_init(container, &ranges);
+ feature = vfio_device_feature_dma_logging_start_create(container,
+ &ranges);
+ if (!feature) {
+ return -errno;
+ }
+
+ QLIST_FOREACH(group, &container->group_list, container_next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (vbasedev->dirty_tracking) {
+ continue;
+ }
+
+ ret = ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature);
+ if (ret) {
+ ret = -errno;
+ error_report("%s: Failed to start DMA logging, err %d (%s)",
+ vbasedev->name, ret, strerror(errno));
+ goto out;
+ }
+ vbasedev->dirty_tracking = true;
+ }
+ }
+
+out:
+ if (ret) {
+ vfio_devices_dma_logging_stop(container);
+ }
+
+ vfio_device_feature_dma_logging_start_destroy(feature);
+
+ return ret;
+}
+
static void vfio_listener_log_global_start(MemoryListener *listener)
{
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
- VFIODirtyRanges ranges;
int ret;
- vfio_dirty_tracking_init(container, &ranges);
+ if (vfio_devices_all_device_dirty_tracking(container)) {
+ ret = vfio_devices_dma_logging_start(container);
+ } else {
+ ret = vfio_set_dirty_page_tracking(container, true);
+ }
- ret = vfio_set_dirty_page_tracking(container, true);
if (ret) {
+ error_report("vfio: Could not start dirty page tracking, err: %d (%s)",
+ ret, strerror(-ret));
vfio_set_migration_error(ret);
}
}
@@ -1424,10 +1580,17 @@ static void vfio_listener_log_global_start(MemoryListener *listener)
static void vfio_listener_log_global_stop(MemoryListener *listener)
{
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
- int ret;
+ int ret = 0;
+
+ if (vfio_devices_all_device_dirty_tracking(container)) {
+ vfio_devices_dma_logging_stop(container);
+ } else {
+ ret = vfio_set_dirty_page_tracking(container, false);
+ }
- ret = vfio_set_dirty_page_tracking(container, false);
if (ret) {
+ error_report("vfio: Could not stop dirty page tracking, err: %d (%s)",
+ ret, strerror(-ret));
vfio_set_migration_error(ret);
}
}
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index dd9fd7b9bddb..bee95dbd977a 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -104,6 +104,7 @@ vfio_known_safe_misalignment(const char *name, uint64_t iova, uint64_t offset_wi
vfio_listener_region_add_no_dma_map(const char *name, uint64_t iova, uint64_t size, uint64_t page_size) "Region \"%s\" 0x%"PRIx64" size=0x%"PRIx64" is not aligned to 0x%"PRIx64" and cannot be mapped for DMA"
vfio_listener_region_del(uint64_t start, uint64_t end) "region_del 0x%"PRIx64" - 0x%"PRIx64
vfio_device_dirty_tracking_update(uint64_t start, uint64_t end, uint64_t min, uint64_t max) "section 0x%"PRIx64" - 0x%"PRIx64" -> update [0x%"PRIx64" - 0x%"PRIx64"]"
+vfio_device_dirty_tracking_start(int nr_ranges, uint64_t min32, uint64_t max32, uint64_t min64, uint64_t max64) "nr_ranges %d 32:[0x%"PRIx64" - 0x%"PRIx64"], 64:[0x%"PRIx64" - 0x%"PRIx64"]"
vfio_disconnect_container(int fd) "close container->fd=%d"
vfio_put_group(int fd) "close group->fd=%d"
vfio_get_device(const char * name, unsigned int flags, unsigned int num_regions, unsigned int num_irqs) "Device %s flags: %u, regions: %u, irqs: %u"
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 87524c64a443..9551d2d43025 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -143,6 +143,8 @@ typedef struct VFIODevice {
VFIOMigration *migration;
Error *migration_blocker;
OnOffAuto pre_copy_dirty_page_tracking;
+ bool dirty_pages_supported;
+ bool dirty_tracking;
} VFIODevice;
struct VFIODeviceOps {
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 11/17] vfio/common: Extract code from vfio_get_dirty_bitmap() to new function
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (9 preceding siblings ...)
2023-03-07 18:53 ` [PULL 10/17] vfio/common: Add device dirty page tracking start/stop Alex Williamson
@ 2023-03-07 18:53 ` Alex Williamson
2023-03-07 18:53 ` [PULL 12/17] vfio/common: Add device dirty page bitmap sync Alex Williamson
` (6 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:53 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Avihai Horon <avihaih@nvidia.com>
Extract the VFIO_IOMMU_DIRTY_PAGES ioctl code in vfio_get_dirty_bitmap()
to its own function.
This will help the code to be more readable after next patch will add
device dirty page bitmap sync functionality.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-12-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 57 +++++++++++++++++++++++++++++++++---------------------
1 file changed, 35 insertions(+), 22 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 55498afeb255..ae81af6d3269 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1595,26 +1595,13 @@ static void vfio_listener_log_global_stop(MemoryListener *listener)
}
}
-static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
- uint64_t size, ram_addr_t ram_addr)
+static int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
+ hwaddr iova, hwaddr size)
{
struct vfio_iommu_type1_dirty_bitmap *dbitmap;
struct vfio_iommu_type1_dirty_bitmap_get *range;
- VFIOBitmap vbmap;
int ret;
- if (!container->dirty_pages_supported) {
- cpu_physical_memory_set_dirty_range(ram_addr, size,
- tcg_enabled() ? DIRTY_CLIENTS_ALL :
- DIRTY_CLIENTS_NOCODE);
- return 0;
- }
-
- ret = vfio_bitmap_alloc(&vbmap, size);
- if (ret) {
- return ret;
- }
-
dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
@@ -1629,8 +1616,8 @@ static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
* to qemu_real_host_page_size.
*/
range->bitmap.pgsize = qemu_real_host_page_size();
- range->bitmap.size = vbmap.size;
- range->bitmap.data = (__u64 *)vbmap.bitmap;
+ range->bitmap.size = vbmap->size;
+ range->bitmap.data = (__u64 *)vbmap->bitmap;
ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
if (ret) {
@@ -1638,16 +1625,42 @@ static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
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;
+ }
+
+ g_free(dbitmap);
+
+ return ret;
+}
+
+static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
+ uint64_t size, ram_addr_t ram_addr)
+{
+ VFIOBitmap vbmap;
+ int ret;
+
+ if (!container->dirty_pages_supported) {
+ cpu_physical_memory_set_dirty_range(ram_addr, size,
+ tcg_enabled() ? DIRTY_CLIENTS_ALL :
+ DIRTY_CLIENTS_NOCODE);
+ return 0;
+ }
+
+ ret = vfio_bitmap_alloc(&vbmap, size);
+ if (ret) {
+ return ret;
+ }
+
+ ret = vfio_query_dirty_bitmap(container, &vbmap, iova, size);
+ if (ret) {
+ goto out;
}
cpu_physical_memory_set_dirty_lebitmap(vbmap.bitmap, ram_addr,
vbmap.pages);
- trace_vfio_get_dirty_bitmap(container->fd, range->iova, range->size,
- range->bitmap.size, ram_addr);
-err_out:
- g_free(dbitmap);
+ trace_vfio_get_dirty_bitmap(container->fd, iova, size, vbmap.size,
+ ram_addr);
+out:
g_free(vbmap.bitmap);
return ret;
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 12/17] vfio/common: Add device dirty page bitmap sync
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (10 preceding siblings ...)
2023-03-07 18:53 ` [PULL 11/17] vfio/common: Extract code from vfio_get_dirty_bitmap() to new function Alex Williamson
@ 2023-03-07 18:53 ` Alex Williamson
2023-03-07 18:53 ` [PULL 13/17] vfio/migration: Block migration with vIOMMU Alex Williamson
` (5 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:53 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Joao Martins <joao.m.martins@oracle.com>
Add device dirty page bitmap sync functionality. This uses the device
DMA logging uAPI to sync dirty page bitmap from the device.
Device dirty page bitmap sync is used only if all devices within a
container support device dirty page tracking.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-13-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++------
1 file changed, 79 insertions(+), 9 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index ae81af6d3269..334c62585829 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -339,6 +339,9 @@ static int vfio_bitmap_alloc(VFIOBitmap *vbmap, hwaddr size)
return 0;
}
+static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
+ uint64_t size, ram_addr_t ram_addr);
+
bool vfio_mig_active(void)
{
VFIOGroup *group;
@@ -562,10 +565,16 @@ static int vfio_dma_unmap(VFIOContainer *container,
.iova = iova,
.size = size,
};
+ bool need_dirty_sync = false;
+ int ret;
+
+ if (iotlb && vfio_devices_all_running_and_mig_active(container)) {
+ if (!vfio_devices_all_device_dirty_tracking(container) &&
+ container->dirty_pages_supported) {
+ return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
+ }
- if (iotlb && container->dirty_pages_supported &&
- vfio_devices_all_running_and_mig_active(container)) {
- return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
+ need_dirty_sync = true;
}
while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
@@ -591,10 +600,12 @@ static int vfio_dma_unmap(VFIOContainer *container,
return -errno;
}
- if (iotlb && vfio_devices_all_running_and_mig_active(container)) {
- cpu_physical_memory_set_dirty_range(iotlb->translated_addr, size,
- tcg_enabled() ? DIRTY_CLIENTS_ALL :
- DIRTY_CLIENTS_NOCODE);
+ if (need_dirty_sync) {
+ ret = vfio_get_dirty_bitmap(container, iova, size,
+ iotlb->translated_addr);
+ if (ret) {
+ return ret;
+ }
}
return 0;
@@ -1595,6 +1606,58 @@ static void vfio_listener_log_global_stop(MemoryListener *listener)
}
}
+static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
+ hwaddr size, void *bitmap)
+{
+ uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) +
+ sizeof(struct vfio_device_feature_dma_logging_report),
+ sizeof(__u64))] = {};
+ struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
+ struct vfio_device_feature_dma_logging_report *report =
+ (struct vfio_device_feature_dma_logging_report *)feature->data;
+
+ report->iova = iova;
+ report->length = size;
+ report->page_size = qemu_real_host_page_size();
+ report->bitmap = (__u64)(uintptr_t)bitmap;
+
+ feature->argsz = sizeof(buf);
+ feature->flags = VFIO_DEVICE_FEATURE_GET |
+ VFIO_DEVICE_FEATURE_DMA_LOGGING_REPORT;
+
+ if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
+ return -errno;
+ }
+
+ return 0;
+}
+
+static int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
+ VFIOBitmap *vbmap, hwaddr iova,
+ hwaddr size)
+{
+ VFIODevice *vbasedev;
+ VFIOGroup *group;
+ int ret;
+
+ QLIST_FOREACH(group, &container->group_list, container_next) {
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ ret = vfio_device_dma_logging_report(vbasedev, iova, size,
+ vbmap->bitmap);
+ if (ret) {
+ error_report("%s: Failed to get DMA logging report, iova: "
+ "0x%" HWADDR_PRIx ", size: 0x%" HWADDR_PRIx
+ ", err: %d (%s)",
+ vbasedev->name, iova, size, ret, strerror(-ret));
+
+ return ret;
+ }
+ }
+ }
+
+ return 0;
+}
+
static int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
hwaddr iova, hwaddr size)
{
@@ -1635,10 +1698,12 @@ static int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
uint64_t size, ram_addr_t ram_addr)
{
+ bool all_device_dirty_tracking =
+ vfio_devices_all_device_dirty_tracking(container);
VFIOBitmap vbmap;
int ret;
- if (!container->dirty_pages_supported) {
+ if (!container->dirty_pages_supported && !all_device_dirty_tracking) {
cpu_physical_memory_set_dirty_range(ram_addr, size,
tcg_enabled() ? DIRTY_CLIENTS_ALL :
DIRTY_CLIENTS_NOCODE);
@@ -1650,7 +1715,12 @@ static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
return ret;
}
- ret = vfio_query_dirty_bitmap(container, &vbmap, iova, size);
+ if (all_device_dirty_tracking) {
+ ret = vfio_devices_query_dirty_bitmap(container, &vbmap, iova, size);
+ } else {
+ ret = vfio_query_dirty_bitmap(container, &vbmap, iova, size);
+ }
+
if (ret) {
goto out;
}
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 13/17] vfio/migration: Block migration with vIOMMU
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (11 preceding siblings ...)
2023-03-07 18:53 ` [PULL 12/17] vfio/common: Add device dirty page bitmap sync Alex Williamson
@ 2023-03-07 18:53 ` Alex Williamson
2023-03-07 18:53 ` [PULL 14/17] vfio/migration: Query device dirty page tracking support Alex Williamson
` (4 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:53 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Joao Martins <joao.m.martins@oracle.com>
Migrating with vIOMMU will require either tracking maximum
IOMMU supported address space (e.g. 39/48 address width on Intel)
or range-track current mappings and dirty track the new ones
post starting dirty tracking. This will be done as a separate
series, so add a live migration blocker until that is fixed.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-14-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 46 +++++++++++++++++++++++++++++++++++++++++
hw/vfio/migration.c | 5 ++++
hw/vfio/pci.c | 1 +
include/hw/vfio/vfio-common.h | 2 ++
4 files changed, 54 insertions(+)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 334c62585829..539246e332b0 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -362,6 +362,7 @@ bool vfio_mig_active(void)
}
static Error *multiple_devices_migration_blocker;
+static Error *giommu_migration_blocker;
static unsigned int vfio_migratable_device_num(void)
{
@@ -413,6 +414,51 @@ void vfio_unblock_multiple_devices_migration(void)
multiple_devices_migration_blocker = NULL;
}
+static bool vfio_viommu_preset(void)
+{
+ VFIOAddressSpace *space;
+
+ QLIST_FOREACH(space, &vfio_address_spaces, list) {
+ if (space->as != &address_space_memory) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+int vfio_block_giommu_migration(Error **errp)
+{
+ int ret;
+
+ if (giommu_migration_blocker ||
+ !vfio_viommu_preset()) {
+ return 0;
+ }
+
+ error_setg(&giommu_migration_blocker,
+ "Migration is currently not supported with vIOMMU enabled");
+ ret = migrate_add_blocker(giommu_migration_blocker, errp);
+ if (ret < 0) {
+ error_free(giommu_migration_blocker);
+ giommu_migration_blocker = NULL;
+ }
+
+ return ret;
+}
+
+void vfio_unblock_giommu_migration(void)
+{
+ if (!giommu_migration_blocker ||
+ vfio_viommu_preset()) {
+ return;
+ }
+
+ migrate_del_blocker(giommu_migration_blocker);
+ error_free(giommu_migration_blocker);
+ giommu_migration_blocker = NULL;
+}
+
static void vfio_set_migration_error(int err)
{
MigrationState *ms = migrate_get_current();
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index a2c3d9bade7f..776fd2d7cdf3 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -634,6 +634,11 @@ int vfio_migration_probe(VFIODevice *vbasedev, Error **errp)
return ret;
}
+ ret = vfio_block_giommu_migration(errp);
+ if (ret) {
+ return ret;
+ }
+
trace_vfio_migration_probe(vbasedev->name);
return 0;
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 939dcc3d4a9e..30a271eab38c 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3185,6 +3185,7 @@ static void vfio_instance_finalize(Object *obj)
*/
vfio_put_device(vdev);
vfio_put_group(group);
+ vfio_unblock_giommu_migration();
}
static void vfio_exitfn(PCIDevice *pdev)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 9551d2d43025..009bec34c4bc 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -222,6 +222,8 @@ extern VFIOGroupList vfio_group_list;
bool vfio_mig_active(void);
int vfio_block_multiple_devices_migration(Error **errp);
void vfio_unblock_multiple_devices_migration(void);
+int vfio_block_giommu_migration(Error **errp);
+void vfio_unblock_giommu_migration(void);
int64_t vfio_mig_bytes_transferred(void);
#ifdef CONFIG_LINUX
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 14/17] vfio/migration: Query device dirty page tracking support
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (12 preceding siblings ...)
2023-03-07 18:53 ` [PULL 13/17] vfio/migration: Block migration with vIOMMU Alex Williamson
@ 2023-03-07 18:53 ` Alex Williamson
2023-03-07 18:53 ` [PULL 15/17] docs/devel: Document VFIO device dirty page tracking Alex Williamson
` (3 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:53 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Joao Martins <joao.m.martins@oracle.com>
Now that everything has been set up for device dirty page tracking,
query the device for device dirty page tracking support.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-15-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/migration.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 776fd2d7cdf3..5d1e66f69194 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -555,6 +555,19 @@ static int vfio_migration_query_flags(VFIODevice *vbasedev, uint64_t *mig_flags)
return 0;
}
+static bool vfio_dma_logging_supported(VFIODevice *vbasedev)
+{
+ uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature),
+ sizeof(uint64_t))] = {};
+ struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
+
+ feature->argsz = sizeof(buf);
+ feature->flags = VFIO_DEVICE_FEATURE_PROBE |
+ VFIO_DEVICE_FEATURE_DMA_LOGGING_START;
+
+ return !ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature);
+}
+
static int vfio_migration_init(VFIODevice *vbasedev)
{
int ret;
@@ -589,6 +602,8 @@ static int vfio_migration_init(VFIODevice *vbasedev)
migration->device_state = VFIO_DEVICE_STATE_RUNNING;
migration->data_fd = -1;
+ vbasedev->dirty_pages_supported = vfio_dma_logging_supported(vbasedev);
+
oid = vmstate_if_get_id(VMSTATE_IF(DEVICE(obj)));
if (oid) {
path = g_strdup_printf("%s/vfio", oid);
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 15/17] docs/devel: Document VFIO device dirty page tracking
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (13 preceding siblings ...)
2023-03-07 18:53 ` [PULL 14/17] vfio/migration: Query device dirty page tracking support Alex Williamson
@ 2023-03-07 18:53 ` Alex Williamson
2023-03-07 18:53 ` [PULL 16/17] vfio/migration: Rename entry points Alex Williamson
` (2 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:53 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Avihai Horon <avihaih@nvidia.com>
Adjust the VFIO dirty page tracking documentation and add a section to
describe device dirty page tracking.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-16-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
docs/devel/vfio-migration.rst | 46 ++++++++++++++++++++++++++++-------------
1 file changed, 31 insertions(+), 15 deletions(-)
diff --git a/docs/devel/vfio-migration.rst b/docs/devel/vfio-migration.rst
index c214c73e2818..1b68ccf11529 100644
--- a/docs/devel/vfio-migration.rst
+++ b/docs/devel/vfio-migration.rst
@@ -59,22 +59,37 @@ System memory dirty pages tracking
----------------------------------
A ``log_global_start`` and ``log_global_stop`` memory listener callback informs
-the VFIO IOMMU module to start and stop dirty page tracking. A ``log_sync``
-memory listener callback marks those system memory pages as dirty which are
-used for DMA by the VFIO device. The dirty pages bitmap is queried per
-container. All pages pinned by the vendor driver through external APIs have to
-be marked as dirty during migration. When there are CPU writes, CPU dirty page
-tracking can identify dirtied pages, but any page pinned by the vendor driver
-can also be written by the device. There is currently no device or IOMMU
-support for dirty page tracking in hardware.
+the VFIO dirty tracking module to start and stop dirty page tracking. A
+``log_sync`` memory listener callback queries the dirty page bitmap from the
+dirty tracking module and marks system memory pages which were DMA-ed by the
+VFIO device as dirty. The dirty page bitmap is queried per container.
+
+Currently there are two ways dirty page tracking can be done:
+(1) Device dirty tracking:
+In this method the device is responsible to log and report its DMAs. This
+method can be used only if the device is capable of tracking its DMAs.
+Discovering device capability, starting and stopping dirty tracking, and
+syncing the dirty bitmaps from the device are done using the DMA logging uAPI.
+More info about the uAPI can be found in the comments of the
+``vfio_device_feature_dma_logging_control`` and
+``vfio_device_feature_dma_logging_report`` structures in the header file
+linux-headers/linux/vfio.h.
+
+(2) VFIO IOMMU module:
+In this method dirty tracking is done by IOMMU. However, there is currently no
+IOMMU support for dirty page tracking. For this reason, all pages are
+perpetually marked dirty, unless the device driver pins pages through external
+APIs in which case only those pinned pages are perpetually marked dirty.
+
+If the above two methods are not supported, all pages are perpetually marked
+dirty by QEMU.
By default, dirty pages are tracked during pre-copy as well as stop-and-copy
-phase. So, a page pinned by the vendor driver will be copied to the destination
-in both phases. Copying dirty pages in pre-copy phase helps QEMU to predict if
-it can achieve its downtime tolerances. If QEMU during pre-copy phase keeps
-finding dirty pages continuously, then it understands that even in stop-and-copy
-phase, it is likely to find dirty pages and can predict the downtime
-accordingly.
+phase. So, a page marked as dirty will be copied to the destination in both
+phases. Copying dirty pages in pre-copy phase helps QEMU to predict if it can
+achieve its downtime tolerances. If QEMU during pre-copy phase keeps finding
+dirty pages continuously, then it understands that even in stop-and-copy phase,
+it is likely to find dirty pages and can predict the downtime accordingly.
QEMU also provides a per device opt-out option ``pre-copy-dirty-page-tracking``
which disables querying the dirty bitmap during pre-copy phase. If it is set to
@@ -89,7 +104,8 @@ phase of migration. In that case, the unmap ioctl returns any dirty pages in
that range and QEMU reports corresponding guest physical pages dirty. During
stop-and-copy phase, an IOMMU notifier is used to get a callback for mapped
pages and then dirty pages bitmap is fetched from VFIO IOMMU modules for those
-mapped ranges.
+mapped ranges. If device dirty tracking is enabled with vIOMMU, live migration
+will be blocked.
Flow of state changes during Live migration
===========================================
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 16/17] vfio/migration: Rename entry points
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (14 preceding siblings ...)
2023-03-07 18:53 ` [PULL 15/17] docs/devel: Document VFIO device dirty page tracking Alex Williamson
@ 2023-03-07 18:53 ` Alex Williamson
2023-03-07 18:53 ` [PULL 17/17] vfio: Fix vfio_get_dev_region() trace event Alex Williamson
2023-03-09 16:51 ` [PULL 00/17] VFIO updates for 8.0 Peter Maydell
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:53 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
Pick names that align with the section drivers should use them from,
avoiding the confusion of calling a _finalize() function from _exit()
and generalizing the actual _finalize() to handle removing the viommu
blocker.
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Link: https://lore.kernel.org/r/167820912978.606734.12740287349119694623.stgit@omen
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/common.c | 2 +-
hw/vfio/migration.c | 8 ++++----
hw/vfio/pci.c | 6 +++---
include/hw/vfio/vfio-common.h | 6 +++---
4 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 539246e332b0..4d01ea351515 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -447,7 +447,7 @@ int vfio_block_giommu_migration(Error **errp)
return ret;
}
-void vfio_unblock_giommu_migration(void)
+void vfio_migration_finalize(void)
{
if (!giommu_migration_blocker ||
vfio_viommu_preset()) {
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 5d1e66f69194..1a1a8659c859 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -521,7 +521,7 @@ static void vfio_migration_state_notifier(Notifier *notifier, void *data)
}
}
-static void vfio_migration_exit(VFIODevice *vbasedev)
+static void vfio_migration_free(VFIODevice *vbasedev)
{
g_free(vbasedev->migration);
vbasedev->migration = NULL;
@@ -631,7 +631,7 @@ int64_t vfio_mig_bytes_transferred(void)
return bytes_transferred;
}
-int vfio_migration_probe(VFIODevice *vbasedev, Error **errp)
+int vfio_migration_realize(VFIODevice *vbasedev, Error **errp)
{
int ret = -ENOTSUP;
@@ -669,7 +669,7 @@ add_blocker:
return ret;
}
-void vfio_migration_finalize(VFIODevice *vbasedev)
+void vfio_migration_exit(VFIODevice *vbasedev)
{
if (vbasedev->migration) {
VFIOMigration *migration = vbasedev->migration;
@@ -677,7 +677,7 @@ void vfio_migration_finalize(VFIODevice *vbasedev)
remove_migration_state_change_notifier(&migration->migration_state);
qemu_del_vm_change_state_handler(migration->vm_state);
unregister_savevm(VMSTATE_IF(vbasedev->dev), "vfio", vbasedev);
- vfio_migration_exit(vbasedev);
+ vfio_migration_free(vbasedev);
vfio_unblock_multiple_devices_migration();
}
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 30a271eab38c..ec9a854361ac 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3145,7 +3145,7 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
}
if (!pdev->failover_pair_id) {
- ret = vfio_migration_probe(vbasedev, errp);
+ ret = vfio_migration_realize(vbasedev, errp);
if (ret) {
error_report("%s: Migration disabled", vbasedev->name);
}
@@ -3185,7 +3185,7 @@ static void vfio_instance_finalize(Object *obj)
*/
vfio_put_device(vdev);
vfio_put_group(group);
- vfio_unblock_giommu_migration();
+ vfio_migration_finalize();
}
static void vfio_exitfn(PCIDevice *pdev)
@@ -3204,7 +3204,7 @@ static void vfio_exitfn(PCIDevice *pdev)
}
vfio_teardown_msi(vdev);
vfio_bars_exit(vdev);
- vfio_migration_finalize(&vdev->vbasedev);
+ vfio_migration_exit(&vdev->vbasedev);
}
static void vfio_pci_reset(DeviceState *dev)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 009bec34c4bc..eed244f25f34 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -223,7 +223,6 @@ bool vfio_mig_active(void);
int vfio_block_multiple_devices_migration(Error **errp);
void vfio_unblock_multiple_devices_migration(void);
int vfio_block_giommu_migration(Error **errp);
-void vfio_unblock_giommu_migration(void);
int64_t vfio_mig_bytes_transferred(void);
#ifdef CONFIG_LINUX
@@ -247,7 +246,8 @@ int vfio_spapr_create_window(VFIOContainer *container,
int vfio_spapr_remove_window(VFIOContainer *container,
hwaddr offset_within_address_space);
-int vfio_migration_probe(VFIODevice *vbasedev, Error **errp);
-void vfio_migration_finalize(VFIODevice *vbasedev);
+int vfio_migration_realize(VFIODevice *vbasedev, Error **errp);
+void vfio_migration_exit(VFIODevice *vbasedev);
+void vfio_migration_finalize(void);
#endif /* HW_VFIO_VFIO_COMMON_H */
^ permalink raw reply related [flat|nested] 19+ messages in thread* [PULL 17/17] vfio: Fix vfio_get_dev_region() trace event
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (15 preceding siblings ...)
2023-03-07 18:53 ` [PULL 16/17] vfio/migration: Rename entry points Alex Williamson
@ 2023-03-07 18:53 ` Alex Williamson
2023-03-09 16:51 ` [PULL 00/17] VFIO updates for 8.0 Peter Maydell
17 siblings, 0 replies; 19+ messages in thread
From: Alex Williamson @ 2023-03-07 18:53 UTC (permalink / raw)
To: qemu-devel; +Cc: alex.williamson, avihaih, clg, joao.m.martins
From: Cédric Le Goater <clg@redhat.com>
Simply transpose 'x8' to fix the typo and remove the ending '8'
Fixes: e61a424f05 ("vfio: Create device specific region info helper")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1526
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/r/20230303074330.2609377-1-clg@kaod.org
[aw: commit log s/revert/transpose/]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
hw/vfio/trace-events | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index bee95dbd977a..646e42fd27f9 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -118,7 +118,7 @@ vfio_region_mmaps_set_enabled(const char *name, bool enabled) "Region %s mmaps e
vfio_region_unmap(const char *name, unsigned long offset, unsigned long end) "Region %s unmap [0x%lx - 0x%lx]"
vfio_region_sparse_mmap_header(const char *name, int index, int nr_areas) "Device %s region %d: %d sparse mmap entries"
vfio_region_sparse_mmap_entry(int i, unsigned long start, unsigned long end) "sparse entry %d [0x%lx - 0x%lx]"
-vfio_get_dev_region(const char *name, int index, uint32_t type, uint32_t subtype) "%s index %d, %08x/%0x8"
+vfio_get_dev_region(const char *name, int index, uint32_t type, uint32_t subtype) "%s index %d, %08x/%08x"
vfio_dma_unmap_overflow_workaround(void) ""
vfio_get_dirty_bitmap(int fd, uint64_t iova, uint64_t size, uint64_t bitmap_size, uint64_t start) "container fd=%d, iova=0x%"PRIx64" size= 0x%"PRIx64" bitmap_size=0x%"PRIx64" start=0x%"PRIx64
vfio_iommu_map_dirty_notify(uint64_t iova_start, uint64_t iova_end) "iommu dirty @ 0x%"PRIx64" - 0x%"PRIx64
^ permalink raw reply related [flat|nested] 19+ messages in thread* Re: [PULL 00/17] VFIO updates for 8.0
2023-03-07 18:52 [PULL 00/17] VFIO updates for 8.0 Alex Williamson
` (16 preceding siblings ...)
2023-03-07 18:53 ` [PULL 17/17] vfio: Fix vfio_get_dev_region() trace event Alex Williamson
@ 2023-03-09 16:51 ` Peter Maydell
17 siblings, 0 replies; 19+ messages in thread
From: Peter Maydell @ 2023-03-09 16:51 UTC (permalink / raw)
To: Alex Williamson; +Cc: qemu-devel, avihaih, clg, joao.m.martins
On Tue, 7 Mar 2023 at 18:52, Alex Williamson <alex.williamson@redhat.com> wrote:
>
> The following changes since commit c29a2f40cd5d1fdad4632b48343cd968db041a44:
>
> Merge tag 'pull-target-arm-20230306' of https://git.linaro.org/people/pmaydell/qemu-arm into staging (2023-03-07 09:58:43 +0000)
>
> are available in the Git repository at:
>
> https://gitlab.com/alex.williamson/qemu.git tags/vfio-updates-20230307.1
>
> for you to fetch changes up to 969dae5448eaa2914be5b974f9e0311b3f95ee2c:
>
> vfio: Fix vfio_get_dev_region() trace event (2023-03-07 11:19:07 -0700)
>
> ----------------------------------------------------------------
> VFIO updates for 8.0
>
> * Device level dirty page tracking support for vfio migration, as well as
> various cleanups and consolidations. (Avihai Horon, Joao Martins)
>
> * Trivial cleanup of migration entry points. (Alex Williamson)
>
> * Fix trace event typo. (Cédric Le Goater)
>
Applied, thanks.
Please update the changelog at https://wiki.qemu.org/ChangeLog/8.0
for any user-visible changes.
-- PMM
^ permalink raw reply [flat|nested] 19+ messages in thread