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| author | Zhao Jin <cronozhj@gmail.com> | 2011-09-19 08:19:51 +0400 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-09-25 20:13:25 +0400 |
| commit | 41bc3186b3c92a4ca05e2aa14bb6272fb491e679 (patch) | |
| tree | 43f66f314c1461710db968e7e820d382d094d453 /arch/x86/kvm | |
| parent | b172e38e435a158cc84169d5b9127a8dd8d21e76 (diff) | |
| download | linux-41bc3186b3c92a4ca05e2aa14bb6272fb491e679.tar.xz | |
KVM: MMU: fix incorrect return of spte
__update_clear_spte_slow should return original spte while the
current code returns low half of original spte combined with high
half of new spte.
Signed-off-by: Zhao Jin <cronozhj@gmail.com>
Reviewed-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 1c5b69373a00..8e8da7960dbe 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -400,7 +400,8 @@ static u64 __update_clear_spte_slow(u64 *sptep, u64 spte) /* xchg acts as a barrier before the setting of the high bits */ orig.spte_low = xchg(&ssptep->spte_low, sspte.spte_low); - orig.spte_high = ssptep->spte_high = sspte.spte_high; + orig.spte_high = ssptep->spte_high; + ssptep->spte_high = sspte.spte_high; count_spte_clear(sptep, spte); return orig.spte; |