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vdpa: store x-svq parameter in VhostVDPAState

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CVQ can be shadowed two ways:
- Device has x-svq=on parameter (current way)
- The device can isolate CVQ in its own vq group

QEMU needs to check for the second condition dynamically, because CVQ
index is not known before the driver ack the features. Since this is
dynamic, the CVQ isolation could vary with different conditions, making
it possible to go from "not isolated group" to "isolated".

Saving the cmdline parameter in an extra field so we never disable CVQ
SVQ in case the device was started with x-svq cmdline.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20221215113144.322011-11-eperezma@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 2022-12-15 12:31:42 +01:00 committed by Michael S. Tsirkin
parent cd831ed5c4
commit 7f211a28fd
1 changed files with 3 additions and 0 deletions
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3
net/vhost-vdpa.c
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@ -38,6 +38,8 @@ typedef struct VhostVDPAState {
void *cvq_cmd_out_buffer;
virtio_net_ctrl_ack *status;
/* The device always have SVQ enabled */
bool always_svq;
bool started;
} VhostVDPAState;
@ -568,6 +570,7 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
s->vhost_vdpa.device_fd = vdpa_device_fd;
s->vhost_vdpa.index = queue_pair_index;
s->always_svq = svq;
s->vhost_vdpa.shadow_vqs_enabled = svq;
s->vhost_vdpa.iova_range = iova_range;
s->vhost_vdpa.iova_tree = iova_tree;