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authorRusty Russell <rusty@rustcorp.com.au>2008-12-30 09:25:57 -0600
committerRusty Russell <rusty@rustcorp.com.au>2008-12-30 09:25:58 +1030
commit498af14783935af487d17dbee4ac451783cbc2b7 (patch)
treedb7a61d88f8eee05e65ac832f571440640299869 /include/linux/virtio_pci.h
parent5f0d1d7f2286c8a02dab69f5f0bd51681fab161e (diff)
virtio: Don't use PAGE_SIZE for vring alignment in virtio_pci.
That doesn't work for non-4k guests which are now appearing. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/virtio_pci.h')
-rw-r--r--include/linux/virtio_pci.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/virtio_pci.h b/include/linux/virtio_pci.h
index e13d7ebcf57..cd0fd5d181a 100644
--- a/include/linux/virtio_pci.h
+++ b/include/linux/virtio_pci.h
@@ -57,4 +57,8 @@
/* 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
+
+/* The alignment to use between consumer and producer parts of vring.
+ * x86 pagesize again. */
+#define VIRTIO_PCI_VRING_ALIGN 4096
#endif