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vdpa: add vhost_vdpa->suspended parameter

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This allows vhost_vdpa to track if it is safe to get the vring base from
the device or not.  If it is not, vhost can fall back to fetch idx from
the guest buffer again.

No functional change intended in this patch, later patches will use this
field.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20230303172445.1089785-6-eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eugenio Pérez 2023-03-03 18:24:36 +01:00 committed by Michael S. Tsirkin
parent 4241e8bd72
commit b6662cb7e5
2 changed files with 10 additions and 0 deletions
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8
hw/virtio/vhost-vdpa.c
View File

@ -1193,6 +1193,14 @@ static int vhost_vdpa_get_vring_base(struct vhost_dev *dev,
return 0;
}
if (!v->suspended) {
/*
* Cannot trust in value returned by device, let vhost recover used
* idx from guest.
*/
return -1;
}
ret = vhost_vdpa_call(dev, VHOST_GET_VRING_BASE, ring);
trace_vhost_vdpa_get_vring_base(dev, ring->index, ring->num);
return ret;

2
include/hw/virtio/vhost-vdpa.h
View File

@ -42,6 +42,8 @@ typedef struct vhost_vdpa {
bool shadow_vqs_enabled;
/* Vdpa must send shadow addresses as IOTLB key for data queues, not GPA */
bool shadow_data;
/* Device suspended successfully */
bool suspended;
/* IOVA mapping used by the Shadow Virtqueue */
VhostIOVATree *iova_tree;
GPtrArray *shadow_vqs;