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authorHollis Blanchard <hollisb@us.ibm.com>2008-11-13 15:48:33 -0600
committerRusty Russell <rusty@rustcorp.com.au>2008-12-30 09:26:04 +1030
commit1b4aa2faeca1b9922033daf2475b6fc13b0ffea6 (patch)
treeb94e3f4ec45151e51ad1b3dfecabc5391684c725 /include
parent87c7d57c17ade5024d95b6ca0da249da49b0672a (diff)
virtio: avoid implicit use of Linux page size in balloon interface
Make the balloon interface always use 4K pages, and convert Linux pfns if necessary. This patch assumes that Linux's PAGE_SHIFT will never be less than 12. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (modified)
Diffstat (limited to 'include')
-rw-r--r--include/linux/virtio_balloon.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/virtio_balloon.h b/include/linux/virtio_balloon.h
index c30c7bfbf39..8726ff77763 100644
--- a/include/linux/virtio_balloon.h
+++ b/include/linux/virtio_balloon.h
@@ -10,6 +10,9 @@
/* The feature bitmap for virtio balloon */
#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */
+/* Size of a PFN in the balloon interface. */
+#define VIRTIO_BALLOON_PFN_SHIFT 12
+
struct virtio_balloon_config
{
/* Number of pages host wants Guest to give up. */