KVM: Reduce misfirings of the fork detector

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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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Avi Kivity 2007-04-30 17:05:38 +03:00

parent 05e0c8c344

commit a25f7e1f8c

1 changed files with 4 additions and 0 deletions

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drivers/kvm/paging_tmpl.h

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