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| author | Avihai Horon <avihaih@nvidia.com> | 2023-08-02 11:14:48 +0300 |
|---|---|---|
| committer | Cédric Le Goater <clg@redhat.com> | 2023-09-11 08:34:05 +0200 |
| commit | 94f775e428f8057ee66425f421b68fe8c94cebcc (patch) | |
| tree | 20e1fb58116d78fcd4fde0404a4d257ddaf81b11 /hw/vfio/trace-events | |
| parent | 3d4d0f0e06630d0098e7940323fe0f96ff87f34f (diff) | |
| download | qemu-94f775e428f8057ee66425f421b68fe8c94cebcc.zip qemu-94f775e428f8057ee66425f421b68fe8c94cebcc.tar.gz qemu-94f775e428f8057ee66425f421b68fe8c94cebcc.tar.bz2 | |
vfio/migration: Add P2P support for VFIO migration
VFIO migration uAPI defines an optional intermediate P2P quiescent
state. While in the P2P quiescent state, P2P DMA transactions cannot be
initiated by the device, but the device can respond to incoming ones.
Additionally, all outstanding P2P transactions are guaranteed to have
been completed by the time the device enters this state.
The purpose of this state is to support migration of multiple devices
that might do P2P transactions between themselves.
Add support for P2P migration by transitioning all the devices to the
P2P quiescent state before stopping or starting the devices. Use the new
VMChangeStateHandler prepare_cb to achieve that behavior.
This will allow migration of multiple VFIO devices if all of them
support P2P migration.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Tested-by: YangHang Liu <yanghliu@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Diffstat (limited to 'hw/vfio/trace-events')
| -rw-r--r-- | hw/vfio/trace-events | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events index ee7509e..329736a 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -167,3 +167,4 @@ vfio_save_setup(const char *name, uint64_t data_buffer_size) " (%s) data buffer 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" +vfio_vmstate_change_prepare(const char *name, int running, const char *reason, const char *dev_state) " (%s) running %d reason %s device state %s" |