linux-kernel - Re: Random guest crashes since 5c34d002dcc7 ("virtio_pci: use shared interrupts for virtqueues")

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Date:   Mon, 27 Mar 2017 19:05:40 +0200
From:   Christoph Hellwig <hch@....de>
To:     Mike Galbraith <efault@....de>
Cc:     Christoph Hellwig <hch@....de>,
        Thorsten Leemhuis <linux@...mhuis.info>, mst@...hat.com,
        virtio-dev@...ts.oasis-open.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        rjones@...hat.com
Subject: Re: Random guest crashes since 5c34d002dcc7 ("virtio_pci: use
        shared interrupts for virtqueues")

Hi Mike,

does the patch below fix that issue for you?

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index df548a6fb844..fd1b06368b1f 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -176,7 +176,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
 	if (err < 0)
 		return err;
 
-	vp_dev->msix_vectors = nvectors;
+	vp_dev->msix_vectors = err; /* number of vectors allocated */
 	vp_dev->msix_names = kmalloc_array(nvectors,
 			sizeof(*vp_dev->msix_names), GFP_KERNEL);
 	if (!vp_dev->msix_names)