From 6652d0811c9463fbfb2d2d1cb2ec03f388145c5f Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Wed, 27 May 2015 16:26:07 +0800 Subject: [PATCH] virtio-pci: don't try to mask or unmask vqs without notifiers We should validate the vq index against nvqs_with_notifiers. Otherwise we may try to mask or unmask vector for vqs without notifiers (e.g control vq). This will lead qemu abort on kvm_irqchip_commit_routes() when trying to boot win8.1 guest. Fixes 851c2a75a6e80c8aa5e713864d98cfb512e7229b ("virtio-pci: speedup MSI-X masking and unmasking") Reported-by: Alex Williamson Signed-off-by: Jason Wang Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/virtio-pci.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index d1ddc39b6f..6d4f64e282 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -632,21 +632,26 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector, if (!virtio_queue_get_num(vdev, index)) { break; } - ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg); - if (ret < 0) { - goto undo; + if (index < proxy->nvqs_with_notifiers) { + ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg); + if (ret < 0) { + goto undo; + } + ++unmasked; } vq = virtio_vector_next_queue(vq); - ++unmasked; } return 0; undo: vq = virtio_vector_first_queue(vdev, vector); - while (vq && --unmasked >= 0) { + while (vq && unmasked >= 0) { index = virtio_get_queue_index(vq); - virtio_pci_vq_vector_mask(proxy, index, vector); + if (index < proxy->nvqs_with_notifiers) { + virtio_pci_vq_vector_mask(proxy, index, vector); + --unmasked; + } vq = virtio_vector_next_queue(vq); } return ret; @@ -664,7 +669,9 @@ static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector) if (!virtio_queue_get_num(vdev, index)) { break; } - virtio_pci_vq_vector_mask(proxy, index, vector); + if (index < proxy->nvqs_with_notifiers) { + virtio_pci_vq_vector_mask(proxy, index, vector); + } vq = virtio_vector_next_queue(vq); } }