KVM: MMU: Fix SMP shadow instantiation race

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There is a race where VCPU0 is shadowing a pagetable entry while VCPU1
is updating it, which results in a stale shadow copy.

Fix that by comparing the contents of the cached guest pte with the
current guest pte after write-protecting the guest pagetable.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

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Marcelo Tosatti 2007-12-11 19:12:27 -05:00 • committed by Avi Kivity

parent 1d07543414

commit 7819026eef

2 changed files with 29 additions and 12 deletions

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12

drivers/kvm/mmu.c

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29

drivers/kvm/paging_tmpl.h

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