[PATCH 3/4] KVM: MMU: notrap it if gpte's reserved is set

[Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>]

We can past the page fault to guest directly if gpte's reserved
is set

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
---
 arch/x86/kvm/paging_tmpl.h |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 291342d..952357a 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -760,6 +760,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 		pt_element_t gpte;
 		gpa_t pte_gpa;
 		gfn_t gfn;
+		bool gpte_invalid;
 
 		if (!is_shadow_present_pte(sp->spt[i]))
 			continue;
@@ -771,12 +772,13 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 			return -EINVAL;
 
 		gfn = gpte_to_gfn(gpte);
-		if (is_rsvd_bits_set(&vcpu->arch.mmu, gpte, PT_PAGE_TABLE_LEVEL)
-		      || gfn != sp->gfns[i] || !is_present_gpte(gpte)
-		      || !(gpte & PT_ACCESSED_MASK)) {
+		gpte_invalid = is_present_gpte(gpte) ||
+		   is_rsvd_bits_set(&vcpu->arch.mmu, gpte, PT_PAGE_TABLE_LEVEL);
+		if (gpte_invalid || gfn != sp->gfns[i] ||
+		      !(gpte & PT_ACCESSED_MASK)) {
 			u64 nonpresent;
 
-			if (is_present_gpte(gpte) || !clear_unsync)
+			if (gpte_invalid || !clear_unsync)
 				nonpresent = shadow_trap_nonpresent_pte;
 			else
 				nonpresent = shadow_notrap_nonpresent_pte;
-- 
1.7.0.4