The virtio PCI devices don't depend on the guest page size. This matters
now PowerPC virtio is gaining ground (they like 64k pages).
Signed-off-by: Rusty Russell <[EMAIL PROTECTED]>
---
drivers/virtio/virtio_pci.c | 2 +-
include/linux/virtio_pci.h | 4 ++++
2 files changed, 5 insertions(+), 1 deletion(-)
diff -r 8014f9c51f4e drivers/virtio/virtio_pci.c
--- a/drivers/virtio/virtio_pci.c Wed Nov 12 21:12:39 2008 +1030
+++ b/drivers/virtio/virtio_pci.c Wed Nov 12 21:47:21 2008 +1030
@@ -244,7 +244,7 @@
}
/* activate the queue */
- iowrite32(virt_to_phys(info->queue) >> PAGE_SHIFT,
+ iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT,
vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
/* create the vring */
diff -r 8014f9c51f4e include/linux/virtio_pci.h
--- a/include/linux/virtio_pci.h Wed Nov 12 21:12:39 2008 +1030
+++ b/include/linux/virtio_pci.h Wed Nov 12 21:47:21 2008 +1030
@@ -53,4 +53,8 @@
/* Virtio ABI version, this must match exactly */
#define VIRTIO_PCI_ABI_VERSION 0
+
+/* How many bits to shift physical queue address written to QUEUE_PFN.
+ * 12 is historical, and due to x86 page size. */
+#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
#endif
--
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