Messages in this thread Patch in this message | | | From | Zhao Jin <> | Subject | [PATCH] kvm, mmu: fix incorrect return of spte | Date | Mon, 19 Sep 2011 12:19:51 +0800 |
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__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> --- 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 1c5b693..8e8da79 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; -- 1.7.4.1
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