tree ed82756435e7909c7698d112195994c2e8062328
parent 399badf315bd4dd571b4b3b7cf666d9a2af40229
author Avi Kivity <avi@qumranet.com> 1168043798 -0800
committer Linus Torvalds <torvalds@woody.osdl.org> 1168070124 -0800

[PATCH] KVM: MMU: Implement simple reverse mapping

Keep in each host page frame's page->private a pointer to the shadow pte which
maps it.  If there are multiple shadow ptes mapping the page, set bit 0 of
page->private, and use the rest as a pointer to a linked list of all such
mappings.

Reverse mappings are needed because we when we cache shadow page tables, we
must protect the guest page tables from being modified by the guest, as that
would invalidate the cached ptes.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>