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virtio-net: count VIRTIO_NET_F_MAC when calculating config_len 

Commit 14f9b664 (hw/virtio-net.c: set config size using host features) tries to
calculate config size based on the host features. But it forgets the
VIRTIO_NET_F_MAC were always set for qemu later. This will lead a zero config
len for virtio-net device when both VIRTIO_NET_F_STATUS and VIRTIO_NET_F_MQ were
disabled form command line. Then qemu will crash when user tries to read the
config of virtio-net.

Fix this by counting VIRTIO_NET_F_MAC and make sure the config at least contains
the mac address.

Cc: Jesse Larrew <jlarrew@linux.vnet.ibm.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 1366874814-2658-1-git-send-email-jasowang@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jason Wang 2013-04-25 15:26:54 +08:00 committed by Anthony Liguori
parent 9f032464c0
commit e9016ee2bd
1 changed files with 1 additions and 0 deletions
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hw/net/virtio-net.c
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@ -1266,6 +1266,7 @@ static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features)
{
int i, config_size = 0;
host_features |= (1 << VIRTIO_NET_F_MAC);
for (i = 0; feature_sizes[i].flags != 0; i++) {
if (host_features & feature_sizes[i].flags) {
config_size = MAX(feature_sizes[i].end, config_size);