From: Hongyong Zang <zanghongyong@xxxxxxxxxx> In pci_enable_msix(), the guest's virtio-serial driver tries to set msi-x with one vector per queue. But it fails and eventually all virtio-serial ports share one MSI-X vector. Because every virtio-serial port has *two* virtqueues, virtio-serial needs (port+1)*2 vectors other than (port+1). This patch allows every virtqueue to have its own MSI-X vector. (When the MSI-X vectors needed are more than MSIX_MAX_ENTRIES defined in qemu: msix.c, all the queues still share one MSI-X vector as before.) Signed-off-by: Hongyong Zang <zanghongyong@xxxxxxxxxx> --- hw/virtio-pci.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-) diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c index 77b75bc..2c9c6fb 100644 --- a/hw/virtio-pci.c +++ b/hw/virtio-pci.c @@ -718,8 +718,11 @@ static int virtio_serial_init_pci(PCIDevice *pci_dev) return -1; } vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED - ? proxy->serial.max_virtserial_ports + 1 + ? (proxy->serial.max_virtserial_ports + 1) * 2 : proxy->nvectors; + /*msix.c: #define MSIX_MAX_ENTRIES 32*/ + if (vdev->nvectors > 32) + vdev->nvectors = 32; virtio_init_pci(proxy, vdev); proxy->nvectors = vdev->nvectors; return 0; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html