On Thu, Aug 20, 2026 at 02:39:47PM +0300, Andrey Drobyshev wrote:
Add a VhostOps callback issuing VHOST_RESET_OWNER, wired up for the kernel
backend. The CPR (checkpoint-restore) path uses it to release device
ownership on the source so the destination can reclaim it later with
VHOST_SET_OWNER.
Originally-by: Mark Kanda <[email protected]>
Originally-by: Steve Sistare <[email protected]>
Originally-by: Ben Chaney <[email protected]>
Signed-off-by: Andrey Drobyshev <[email protected]>
---
hw/virtio/vhost-kernel.c | 6 ++++++
include/hw/virtio/vhost-backend.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/hw/virtio/vhost-kernel.c b/hw/virtio/vhost-kernel.c
index 3390b48c6f1..55d316b88e9 100644
--- a/hw/virtio/vhost-kernel.c
+++ b/hw/virtio/vhost-kernel.c
@@ -261,6 +261,11 @@ static int vhost_kernel_set_owner(struct vhost_dev *dev)
return vhost_kernel_call(dev, VHOST_SET_OWNER, NULL);
}
+static int vhost_kernel_reset_owner(struct vhost_dev *dev)
+{
+ return vhost_kernel_call(dev, VHOST_RESET_OWNER, NULL);
+}
+
static int vhost_kernel_get_vq_index(struct vhost_dev *dev, int idx)
{
assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
@@ -385,6 +390,7 @@ const VhostOps kernel_ops = {
.vhost_get_features_ex = vhost_kernel_get_features,
.vhost_set_backend_cap = vhost_kernel_set_backend_cap,
.vhost_set_owner = vhost_kernel_set_owner,
+ .vhost_reset_owner = vhost_kernel_reset_owner,
.vhost_get_vq_index = vhost_kernel_get_vq_index,
.vhost_vsock_set_guest_cid = vhost_kernel_vsock_set_guest_cid,
.vhost_vsock_set_running = vhost_kernel_vsock_set_running,
diff --git a/include/hw/virtio/vhost-backend.h
b/include/hw/virtio/vhost-backend.h
index d878d7b733a..6c949e6a38d 100644
--- a/include/hw/virtio/vhost-backend.h
+++ b/include/hw/virtio/vhost-backend.h
@@ -204,6 +204,7 @@ typedef struct VhostOps {
vhost_get_features_op vhost_get_features;
vhost_set_backend_cap_op vhost_set_backend_cap;
vhost_set_owner_op vhost_set_owner;
+ vhost_set_owner_op vhost_reset_owner;
Should we introduce `vhost_reset_owner_op` ?
Stefano
vhost_reset_device_op vhost_reset_device;
vhost_get_vq_index_op vhost_get_vq_index;
vhost_set_vring_enable_op vhost_set_vring_enable;
--
2.47.1
