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KVM: MMU: don't atomicly set spte if it's not present

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If the old mapping is not present, the spte.a is not lost, so no need
atomic operation to set it

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-07-16 11:27:10 +08:00 committed by Avi Kivity
parent 9ed5520dd3
commit be233d49ea
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kvm/mmu.c
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@ -307,9 +307,10 @@ static void update_spte(u64 *sptep, u64 new_spte)
{
u64 old_spte;
if (!shadow_accessed_mask || (new_spte & shadow_accessed_mask)) {
if (!shadow_accessed_mask || (new_spte & shadow_accessed_mask) ||
!is_rmap_spte(*sptep))
__set_spte(sptep, new_spte);
} else {
else {
old_spte = __xchg_spte(sptep, new_spte);
if (old_spte & shadow_accessed_mask)
mark_page_accessed(pfn_to_page(spte_to_pfn(old_spte)));