Emit VFIO device migration state change QAPI event when a VFIO device
changes its migration state. This can be used by management applications
to get updates on the current state of the VFIO device for their own
purposes.
A new per VFIO device capability, "migration-events", is added so events
can be enabled only for the required devices. It is disabled by default.
Signed-off-by: Avihai Horon <avih...@nvidia.com>
---
include/hw/vfio/vfio-common.h | 1 +
hw/vfio/migration.c | 44 +++++++++++++++++++++++++++++++++++
hw/vfio/pci.c | 2 ++
3 files changed, 47 insertions(+)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index b9da6c08ef..3ec5f2425e 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -115,6 +115,7 @@ typedef struct VFIODevice {
bool no_mmap;
bool ram_block_discard_allowed;
OnOffAuto enable_migration;
+ bool migration_events;
VFIODeviceOps *ops;
unsigned int num_irqs;
unsigned int num_regions;
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 06ae40969b..6bbccf6545 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -24,6 +24,7 @@
#include "migration/register.h"
#include "migration/blocker.h"
#include "qapi/error.h"
+#include "qapi/qapi-events-vfio.h"
#include "exec/ramlist.h"
#include "exec/ram_addr.h"
#include "pci.h"
@@ -80,6 +81,46 @@ static const char *mig_state_to_str(enum
vfio_device_mig_state state)
}
}
+static VFIODeviceMigState
+mig_state_to_qapi_state(enum vfio_device_mig_state state)
+{
+ switch (state) {
+ case VFIO_DEVICE_STATE_STOP:
+ return QAPI_VFIO_DEVICE_MIG_STATE_STOP;
+ case VFIO_DEVICE_STATE_RUNNING:
+ return QAPI_VFIO_DEVICE_MIG_STATE_RUNNING;
+ case VFIO_DEVICE_STATE_STOP_COPY:
+ return QAPI_VFIO_DEVICE_MIG_STATE_STOP_COPY;
+ case VFIO_DEVICE_STATE_RESUMING:
+ return QAPI_VFIO_DEVICE_MIG_STATE_RESUMING;
+ case VFIO_DEVICE_STATE_RUNNING_P2P:
+ return QAPI_VFIO_DEVICE_MIG_STATE_RUNNING_P2P;
+ case VFIO_DEVICE_STATE_PRE_COPY:
+ return QAPI_VFIO_DEVICE_MIG_STATE_PRE_COPY;
+ case VFIO_DEVICE_STATE_PRE_COPY_P2P:
+ return QAPI_VFIO_DEVICE_MIG_STATE_PRE_COPY_P2P;
+ default:
+ g_assert_not_reached();
+ }
+}
+
+static void vfio_migration_send_state_change_event(VFIODevice *vbasedev)
+{
+ VFIOMigration *migration = vbasedev->migration;
+ const char *id;
+ Object *obj;
+
+ if (!vbasedev->migration_events) {
+ return;
+ }
+
+ obj = vbasedev->ops->vfio_get_object(vbasedev);
+ id = object_get_canonical_path_component(obj);
+
+ qapi_event_send_vfio_device_mig_state_changed(
+ id, mig_state_to_qapi_state(migration->device_state));
+}
+
static int vfio_migration_set_state(VFIODevice *vbasedev,
enum vfio_device_mig_state new_state,
enum vfio_device_mig_state recover_state)
@@ -126,11 +167,13 @@ static int vfio_migration_set_state(VFIODevice *vbasedev,
}
migration->device_state = recover_state;
+ vfio_migration_send_state_change_event(vbasedev);
return ret;
}
migration->device_state = new_state;
+ vfio_migration_send_state_change_event(vbasedev);
if (mig_state->data_fd != -1) {
if (migration->data_fd != -1) {
/*
@@ -157,6 +200,7 @@ reset_device:
}
migration->device_state = VFIO_DEVICE_STATE_RUNNING;
+ vfio_migration_send_state_change_event(vbasedev);
return ret;
}
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 64780d1b79..8840602c50 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3362,6 +3362,8 @@ static Property vfio_pci_dev_properties[] = {
VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT, false),
DEFINE_PROP_ON_OFF_AUTO("enable-migration", VFIOPCIDevice,
vbasedev.enable_migration, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_BOOL("migration-events", VFIOPCIDevice,
+ vbasedev.migration_events, false),
DEFINE_PROP_BOOL("x-no-mmap", VFIOPCIDevice, vbasedev.no_mmap, false),
DEFINE_PROP_BOOL("x-balloon-allowed", VFIOPCIDevice,
vbasedev.ram_block_discard_allowed, false),
--
2.26.3
