From: Avi Kivity <avi@qumranet.com>
Date: Mon, 30 Apr 2007 14:05:38 +0000 (+0300)
Subject: KVM: Reduce misfirings of the fork detector
X-Git-Tag: v2.6.23-rc1~520^2~74
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a25f7e1f8c1ff68213a63dada9d5e32dc1a0f587;p=pandora-kernel.git

KVM: Reduce misfirings of the fork detector

The kvm mmu tries to detects forks by looking for repeated writes to a
page table.  If it sees a fork, it unshadows the page table so the page
table copying can proceed at native speed instead of being emulated.

However, the detector also triggered on simple demand paging access patterns:
a linear walk of memory would of course cause repeated writes to the same
pagetable page, causing it to unshadow prematurely.

Fix by resetting the fork detector if we detect a demand fault.

Signed-off-by: Avi Kivity <avi@qumranet.com>
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