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[Qemu-devel] [PATCH 2/2] virtio-scsi: enable MSI-X support
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 2/2] virtio-scsi: enable MSI-X support |
Date: |
Fri, 27 Jul 2012 14:39:23 +0200 |
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 <address@hidden>
---
hw/virtio-pci.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 82859a5..1109467 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(),
};
--
1.7.10.4