The following MSI-X vectors are required:
* VIRTIO Configuration Change
* hiprio virtqueue
* requests virtqueues
Fix the calculation to reserve enough MSI-X vectors. Otherwise guest
drivers fall back to a sub-optional configuration where all virtqueues
share a single vector.
This change does not break live migration compatibility since
vhost-user-fs-pci devices are not migratable yet.
Reported-by: Vivek Goyal <vgo...@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
---
hw/virtio/vhost-user-fs-pci.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/hw/virtio/vhost-user-fs-pci.c b/hw/virtio/vhost-user-fs-pci.c
index 933a3f265b..e3a649d4a6 100644
--- a/hw/virtio/vhost-user-fs-pci.c
+++ b/hw/virtio/vhost-user-fs-pci.c
@@ -40,7 +40,8 @@ static void vhost_user_fs_pci_realize(VirtIOPCIProxy
*vpci_dev, Error **errp)
DeviceState *vdev = DEVICE(&dev->vdev);
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
- vpci_dev->nvectors = dev->vdev.conf.num_request_queues + 1;
+ /* Also reserve config change and hiprio queue vectors */
+ vpci_dev->nvectors = dev->vdev.conf.num_request_queues + 2;
}
qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
--
2.23.0
