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-rw-r--r--hw/vfio/common.c6
-rw-r--r--hw/vfio/migration.c165
-rw-r--r--hw/vfio/trace-events4
3 files changed, 163 insertions, 12 deletions
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index fa8fd94..25801de 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -492,7 +492,8 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
}
if (vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF &&
- migration->device_state == VFIO_DEVICE_STATE_RUNNING) {
+ (migration->device_state == VFIO_DEVICE_STATE_RUNNING ||
+ migration->device_state == VFIO_DEVICE_STATE_PRE_COPY)) {
return false;
}
}
@@ -537,7 +538,8 @@ static bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
return false;
}
- if (migration->device_state == VFIO_DEVICE_STATE_RUNNING) {
+ if (migration->device_state == VFIO_DEVICE_STATE_RUNNING ||
+ migration->device_state == VFIO_DEVICE_STATE_PRE_COPY) {
continue;
} else {
return false;
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 8d33414..d8f6a22 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -68,6 +68,8 @@ static const char *mig_state_to_str(enum vfio_device_mig_state state)
return "STOP_COPY";
case VFIO_DEVICE_STATE_RESUMING:
return "RESUMING";
+ case VFIO_DEVICE_STATE_PRE_COPY:
+ return "PRE_COPY";
default:
return "UNKNOWN STATE";
}
@@ -241,6 +243,25 @@ static int vfio_query_stop_copy_size(VFIODevice *vbasedev,
return 0;
}
+static int vfio_query_precopy_size(VFIOMigration *migration)
+{
+ struct vfio_precopy_info precopy = {
+ .argsz = sizeof(precopy),
+ };
+
+ migration->precopy_init_size = 0;
+ migration->precopy_dirty_size = 0;
+
+ if (ioctl(migration->data_fd, VFIO_MIG_GET_PRECOPY_INFO, &precopy)) {
+ return -errno;
+ }
+
+ migration->precopy_init_size = precopy.initial_bytes;
+ migration->precopy_dirty_size = precopy.dirty_bytes;
+
+ return 0;
+}
+
/* Returns the size of saved data on success and -errno on error */
static ssize_t vfio_save_block(QEMUFile *f, VFIOMigration *migration)
{
@@ -249,6 +270,14 @@ static ssize_t vfio_save_block(QEMUFile *f, VFIOMigration *migration)
data_size = read(migration->data_fd, migration->data_buffer,
migration->data_buffer_size);
if (data_size < 0) {
+ /*
+ * Pre-copy emptied all the device state for now. For more information,
+ * please refer to the Linux kernel VFIO uAPI.
+ */
+ if (errno == ENOMSG) {
+ return 0;
+ }
+
return -errno;
}
if (data_size == 0) {
@@ -265,6 +294,38 @@ static ssize_t vfio_save_block(QEMUFile *f, VFIOMigration *migration)
return qemu_file_get_error(f) ?: data_size;
}
+static void vfio_update_estimated_pending_data(VFIOMigration *migration,
+ uint64_t data_size)
+{
+ if (!data_size) {
+ /*
+ * Pre-copy emptied all the device state for now, update estimated sizes
+ * accordingly.
+ */
+ migration->precopy_init_size = 0;
+ migration->precopy_dirty_size = 0;
+
+ return;
+ }
+
+ if (migration->precopy_init_size) {
+ uint64_t init_size = MIN(migration->precopy_init_size, data_size);
+
+ migration->precopy_init_size -= init_size;
+ data_size -= init_size;
+ }
+
+ migration->precopy_dirty_size -= MIN(migration->precopy_dirty_size,
+ data_size);
+}
+
+static bool vfio_precopy_supported(VFIODevice *vbasedev)
+{
+ VFIOMigration *migration = vbasedev->migration;
+
+ return migration->mig_flags & VFIO_MIGRATION_PRE_COPY;
+}
+
/* ---------------------------------------------------------------------- */
static int vfio_save_setup(QEMUFile *f, void *opaque)
@@ -285,6 +346,28 @@ static int vfio_save_setup(QEMUFile *f, void *opaque)
return -ENOMEM;
}
+ if (vfio_precopy_supported(vbasedev)) {
+ int ret;
+
+ switch (migration->device_state) {
+ case VFIO_DEVICE_STATE_RUNNING:
+ ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_PRE_COPY,
+ VFIO_DEVICE_STATE_RUNNING);
+ if (ret) {
+ return ret;
+ }
+
+ vfio_query_precopy_size(migration);
+
+ break;
+ case VFIO_DEVICE_STATE_STOP:
+ /* vfio_save_complete_precopy() will go to STOP_COPY */
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
trace_vfio_save_setup(vbasedev->name, migration->data_buffer_size);
qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
@@ -299,26 +382,42 @@ static void vfio_save_cleanup(void *opaque)
g_free(migration->data_buffer);
migration->data_buffer = NULL;
+ migration->precopy_init_size = 0;
+ migration->precopy_dirty_size = 0;
vfio_migration_cleanup(vbasedev);
trace_vfio_save_cleanup(vbasedev->name);
}
+static void vfio_state_pending_estimate(void *opaque, uint64_t *must_precopy,
+ uint64_t *can_postcopy)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+
+ if (migration->device_state != VFIO_DEVICE_STATE_PRE_COPY) {
+ return;
+ }
+
+ *must_precopy +=
+ migration->precopy_init_size + migration->precopy_dirty_size;
+
+ trace_vfio_state_pending_estimate(vbasedev->name, *must_precopy,
+ *can_postcopy,
+ migration->precopy_init_size,
+ migration->precopy_dirty_size);
+}
+
/*
* Migration size of VFIO devices can be as little as a few KBs or as big as
* many GBs. This value should be big enough to cover the worst case.
*/
#define VFIO_MIG_STOP_COPY_SIZE (100 * GiB)
-/*
- * Only exact function is implemented and not estimate function. The reason is
- * that during pre-copy phase of migration the estimate function is called
- * repeatedly while pending RAM size is over the threshold, thus migration
- * can't converge and querying the VFIO device pending data size is useless.
- */
static void vfio_state_pending_exact(void *opaque, uint64_t *must_precopy,
uint64_t *can_postcopy)
{
VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
uint64_t stop_copy_size = VFIO_MIG_STOP_COPY_SIZE;
/*
@@ -328,8 +427,48 @@ static void vfio_state_pending_exact(void *opaque, uint64_t *must_precopy,
vfio_query_stop_copy_size(vbasedev, &stop_copy_size);
*must_precopy += stop_copy_size;
+ if (migration->device_state == VFIO_DEVICE_STATE_PRE_COPY) {
+ vfio_query_precopy_size(migration);
+
+ *must_precopy +=
+ migration->precopy_init_size + migration->precopy_dirty_size;
+ }
+
trace_vfio_state_pending_exact(vbasedev->name, *must_precopy, *can_postcopy,
- stop_copy_size);
+ stop_copy_size, migration->precopy_init_size,
+ migration->precopy_dirty_size);
+}
+
+static bool vfio_is_active_iterate(void *opaque)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+
+ return migration->device_state == VFIO_DEVICE_STATE_PRE_COPY;
+}
+
+static int vfio_save_iterate(QEMUFile *f, void *opaque)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+ ssize_t data_size;
+
+ data_size = vfio_save_block(f, migration);
+ if (data_size < 0) {
+ return data_size;
+ }
+ qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
+
+ vfio_update_estimated_pending_data(migration, data_size);
+
+ trace_vfio_save_iterate(vbasedev->name, migration->precopy_init_size,
+ migration->precopy_dirty_size);
+
+ /*
+ * A VFIO device's pre-copy dirty_bytes is not guaranteed to reach zero.
+ * Return 1 so following handlers will not be potentially blocked.
+ */
+ return 1;
}
static int vfio_save_complete_precopy(QEMUFile *f, void *opaque)
@@ -338,7 +477,7 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque)
ssize_t data_size;
int ret;
- /* We reach here with device state STOP only */
+ /* We reach here with device state STOP or STOP_COPY only */
ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_STOP_COPY,
VFIO_DEVICE_STATE_STOP);
if (ret) {
@@ -457,7 +596,10 @@ static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
static const SaveVMHandlers savevm_vfio_handlers = {
.save_setup = vfio_save_setup,
.save_cleanup = vfio_save_cleanup,
+ .state_pending_estimate = vfio_state_pending_estimate,
.state_pending_exact = vfio_state_pending_exact,
+ .is_active_iterate = vfio_is_active_iterate,
+ .save_live_iterate = vfio_save_iterate,
.save_live_complete_precopy = vfio_save_complete_precopy,
.save_state = vfio_save_state,
.load_setup = vfio_load_setup,
@@ -470,13 +612,18 @@ static const SaveVMHandlers savevm_vfio_handlers = {
static void vfio_vmstate_change(void *opaque, bool running, RunState state)
{
VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
enum vfio_device_mig_state new_state;
int ret;
if (running) {
new_state = VFIO_DEVICE_STATE_RUNNING;
} else {
- new_state = VFIO_DEVICE_STATE_STOP;
+ new_state =
+ (migration->device_state == VFIO_DEVICE_STATE_PRE_COPY &&
+ (state == RUN_STATE_FINISH_MIGRATE || state == RUN_STATE_PAUSED)) ?
+ VFIO_DEVICE_STATE_STOP_COPY :
+ VFIO_DEVICE_STATE_STOP;
}
/*
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index cfb60c3..e328d64 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -162,6 +162,8 @@ vfio_save_block(const char *name, int data_size) " (%s) data_size %d"
vfio_save_cleanup(const char *name) " (%s)"
vfio_save_complete_precopy(const char *name, int ret) " (%s) ret %d"
vfio_save_device_config_state(const char *name) " (%s)"
+vfio_save_iterate(const char *name, uint64_t precopy_init_size, uint64_t precopy_dirty_size) " (%s) precopy initial size 0x%"PRIx64" precopy dirty size 0x%"PRIx64
vfio_save_setup(const char *name, uint64_t data_buffer_size) " (%s) data buffer size 0x%"PRIx64
-vfio_state_pending_exact(const char *name, uint64_t precopy, uint64_t postcopy, uint64_t stopcopy_size) " (%s) precopy 0x%"PRIx64" postcopy 0x%"PRIx64" stopcopy size 0x%"PRIx64
+vfio_state_pending_estimate(const char *name, uint64_t precopy, uint64_t postcopy, uint64_t precopy_init_size, uint64_t precopy_dirty_size) " (%s) precopy 0x%"PRIx64" postcopy 0x%"PRIx64" precopy initial size 0x%"PRIx64" precopy dirty size 0x%"PRIx64
+vfio_state_pending_exact(const char *name, uint64_t precopy, uint64_t postcopy, uint64_t stopcopy_size, uint64_t precopy_init_size, uint64_t precopy_dirty_size) " (%s) precopy 0x%"PRIx64" postcopy 0x%"PRIx64" stopcopy size 0x%"PRIx64" precopy initial size 0x%"PRIx64" precopy dirty size 0x%"PRIx64
vfio_vmstate_change(const char *name, int running, const char *reason, const char *dev_state) " (%s) running %d reason %s device state %s"
generated by cgit v1.1 at 2024-12-24 03:25:11 +0000