From: Michael S. Tsirkin <mst@redhat.com>
Date: Sun, 29 Nov 2009 15:52:00 +0000 (+0200)
Subject: virtio: set pci bus master enable bit
X-Git-Tag: v2.6.32.32~10
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=d09706f85cda0c49b345b90df6d6350db7d6f9c4;p=linux-pvops.git

virtio: set pci bus master enable bit

commit bc505f373979692d51a86d40925f77a8b09d17b9 upstream.

As all virtio devices perform DMA, we
must enable bus mastering for them to be
spec compliant.

This patch fixes hotplug of virtio devices
with Linux guests and qemu 0.11-0.12.

Tested-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Cc: maximilian attems <max@stro.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 5fed28387b3f..d10c85764ee3 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -647,6 +647,7 @@ static int __devinit virtio_pci_probe(struct pci_dev *pci_dev,
 		goto out_req_regions;
 
 	pci_set_drvdata(pci_dev, vp_dev);
+	pci_set_master(pci_dev);
 
 	/* we use the subsystem vendor/device id as the virtio vendor/device
 	 * id.  this allows us to use the same PCI vendor/device id for all