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vfio/common: Add device dirty page tracking start/stop 

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>
master
Joao Martins 2023-03-07 12:54:45 +00:00 committed by Alex Williamson
parent 62c1b0024b
commit 5255bbf4ec
3 changed files with 171 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

173
hw/vfio/common.c
View File

@ -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);
}
}

1
hw/vfio/trace-events
View File

@ -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"

2
include/hw/vfio/vfio-common.h
View File

@ -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 {