| commit | 7819026eefee53eaaac3fdce1a2f157c7ea943fe | |
| author | Marcelo Tosatti <marcelo@kvack.org> | |
| Wed, 12 Dec 2007 00:12:27 +0000 (11 19:12 -0500) | ||
| committer | Avi Kivity <avi@qumranet.com> | |
| Wed, 30 Jan 2008 15:53:21 +0000 (30 17:53 +0200) | ||
| tree | e5ee690406a8ebe381ce5d712f010a5a0c706c4c | treesnapshot (tar.gz zip) |
| parent | 1d075434149c38d457c30d1f11d9c39210b0bb79 | commitdiff |
KVM: MMU: Fix SMP shadow instantiation race
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>
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>
| drivers/kvm/mmu.c | diffblobblamehistory | |
| drivers/kvm/paging_tmpl.h | diffblobblamehistory |