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virtio: Use PCI revision field to indicate virtio PCI ABI version

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As Avi pointed out, as we continue to massage the virtio PCI ABI, we can make
things a little more friendly to users by utilizing the PCI revision field to
indicate which version of the ABI we're using.  This is a hard ABI version
and incrementing it will cause the guest driver to break.

This is the necessary changes to virtio_pci to support this.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Anthony Liguori 2008-01-28 09:59:59 -06:00 committed by Rusty Russell
parent 3343660d8c
commit 55a7c06604
2 changed files with 8 additions and 0 deletions
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6
drivers/virtio/virtio_pci.c
View File

@ -311,6 +311,12 @@ static int __devinit virtio_pci_probe(struct pci_dev *pci_dev,
if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
return -ENODEV;
if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {
printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d\n",
VIRTIO_PCI_ABI_VERSION, pci_dev->revision);
return -ENODEV;
}
/* allocate our structure and fill it out */
vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
if (vp_dev == NULL)

2
include/linux/virtio_pci.h
View File

@ -52,4 +52,6 @@
* configuration space */
#define VIRTIO_PCI_CONFIG 20
/* Virtio ABI version, this must match exactly */
#define VIRTIO_PCI_ABI_VERSION 0
#endif