From 55a7c066041e7850948d29ed813f62821a9ec046 Mon Sep 17 00:00:00 2001 From: Anthony Liguori Date: Mon, 28 Jan 2008 09:59:59 -0600 Subject: virtio: Use PCI revision field to indicate virtio PCI ABI version 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 Signed-off-by: Rusty Russell --- drivers/virtio/virtio_pci.c | 6 ++++++ include/linux/virtio_pci.h | 2 ++ 2 files changed, 8 insertions(+) diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c index 192687e3a56a..26f787ddd5ff 100644 --- a/drivers/virtio/virtio_pci.c +++ b/drivers/virtio/virtio_pci.c @@ -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) diff --git a/include/linux/virtio_pci.h b/include/linux/virtio_pci.h index 860eb37bfa07..b3151659cf49 100644 --- a/include/linux/virtio_pci.h +++ b/include/linux/virtio_pci.h @@ -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 -- cgit v1.2.3-58-ga151