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virtio: avoid implicit use of Linux page size in balloon interface

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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)
This commit is contained in:
Hollis Blanchard
2008-11-13 15:48:33 -06:00
committed by Rusty Russell
parent 87c7d57c17
commit 1b4aa2faec
2 changed files with 14 additions and 2 deletions
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3
include/linux/virtio_balloon.h
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@@ -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. */