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| author | Paolo Bonzini <pbonzini@redhat.com> | 2012-07-27 14:38:03 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2012-07-27 15:47:30 +0200 |
| commit | 4c205d0cb1c8bde5a53f6acceda74dae1043a197 (patch) | |
| tree | 523369fc3994b78a437c1e6389aabaeafdceaae1 | |
| parent | 3f910904ecce48bcfd6ee269e8ac84a571fbc1e3 (diff) | |
| download | focaccia-qemu-4c205d0cb1c8bde5a53f6acceda74dae1043a197.tar.gz focaccia-qemu-4c205d0cb1c8bde5a53f6acceda74dae1043a197.zip | |
virtio-scsi: enable MSI-X support
While virtio-scsi does support multiqueue, the default number of interrupt vectors is not enough to actually enable usage of multiple queues in the driver; this is because with only 2 vectors the driver will not be able to use a separate interrupt for each request queue. Derive the desired number of vectors from the number of request queues. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | hw/virtio-pci.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c index 82859a5724..1109467d19 100644 --- a/hw/virtio-pci.c +++ b/hw/virtio-pci.c @@ -1023,7 +1023,9 @@ static int virtio_scsi_init_pci(PCIDevice *pci_dev) return -EINVAL; } - vdev->nvectors = proxy->nvectors; + vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED + ? proxy->scsi.num_queues + 3 + : proxy->nvectors; virtio_init_pci(proxy, vdev); /* make the actual value visible */ @@ -1041,7 +1043,7 @@ static int virtio_scsi_exit_pci(PCIDevice *pci_dev) static Property virtio_scsi_properties[] = { DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), - DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), + DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, DEV_NVECTORS_UNSPECIFIED), DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOPCIProxy, host_features, scsi), DEFINE_PROP_END_OF_LIST(), }; |