[PATCH v4 2/8] KVM: MMU: Use __set_spte to link shadow pages

[Avi Kivity <avi@redhat.com>]

To avoid split accesses to 64 bit sptes on i386, use __set_spte() to link
shadow pages together.

(not technically required since shadow pages are __GFP_KERNEL, so upper 32
bits are always clear)

Reviewed-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
 arch/x86/kvm/mmu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index ae35853..75cfb79 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1489,7 +1489,7 @@ static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp)
 	spte = __pa(sp->spt)
 		| PT_PRESENT_MASK | PT_ACCESSED_MASK
 		| PT_WRITABLE_MASK | PT_USER_MASK;
-	*sptep = spte;
+	__set_spte(sptep, spte);
 }
 
 static void kvm_mmu_page_unlink_children(struct kvm *kvm,
-- 
1.7.1