On 2021/1/30 上午4:54, Eugenio Pérez wrote:
Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
---
include/hw/virtio/vhost.h | 1 +
hw/virtio/vhost.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+)
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 4a8bc75415..fca076e3f0 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -123,6 +123,7 @@ uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
uint64_t features);
bool vhost_has_free_slot(void);
+struct vhost_dev *vhost_dev_from_virtio(const VirtIODevice *vdev);
int vhost_net_set_backend(struct vhost_dev *hdev,
struct vhost_vring_file *file);
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 28c7d78172..8683d507f5 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -61,6 +61,23 @@ bool vhost_has_free_slot(void)
return slots_limit > used_memslots;
}
+/*
+ * Get the vhost device associated to a VirtIO device.
+ */
+struct vhost_dev *vhost_dev_from_virtio(const VirtIODevice *vdev)
+{
+ struct vhost_dev *hdev;
+
+ QLIST_FOREACH(hdev, &vhost_devices, entry) {
+ if (hdev->vdev == vdev) {
+ return hdev;
+ }
+ }
+
+ assert(hdev);
+ return NULL;
+}
I'm not sure this can work in the case of multiqueue. E.g vhost-net
multiqueue is a N:1 mapping between vhost devics and virtio devices.
Thanks
+
static void vhost_dev_sync_region(struct vhost_dev *dev,
MemoryRegionSection *section,
uint64_t mfirst, uint64_t mlast,
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