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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>
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@ -400,7 +400,8 @@ static u64 __update_clear_spte_slow(u64 *sptep, u64 spte)
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/* xchg acts as a barrier before the setting of the high bits */
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orig.spte_low = xchg(&ssptep->spte_low, sspte.spte_low);
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orig.spte_high = ssptep->spte_high = sspte.spte_high;
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orig.spte_high = ssptep->spte_high;
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ssptep->spte_high = sspte.spte_high;
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count_spte_clear(sptep, spte);
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return orig.spte;
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