Messages in this thread Patch in this message | | | From | Rusty Russell <> | Date | Wed, 12 Nov 2008 06:22:21 -0600 | Subject | [PATCH 1/7] virtio: Don't use PAGE_SIZE in virtio_pci.c |
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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 <rusty@rustcorp.com.au> --- 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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