[COMMIT master] KVM: MMU: don't mark spte notrap if reserved bit set

[Avi Kivity <avi@xxxxxxxxxx>]

From: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx>

If reserved bit is set, we need inject the #PF with PFEC.RSVD=1,
but shadow_notrap_nonpresent_pte injects #PF with PFEC.RSVD=0 only

Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index ba00eef..590bf12 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -395,8 +395,10 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw,
 
 		gpte = gptep[i];
 
-		if (!is_present_gpte(gpte) ||
-		      is_rsvd_bits_set(mmu, gpte, PT_PAGE_TABLE_LEVEL)) {
+		if (is_rsvd_bits_set(mmu, gpte, PT_PAGE_TABLE_LEVEL))
+			continue;
+
+		if (!is_present_gpte(gpte)) {
 			if (!sp->unsync)
 				__set_spte(spte, shadow_notrap_nonpresent_pte);
 			continue;
@@ -760,6 +762,7 @@ 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 rsvd_bits_set;
 
 		if (!is_shadow_present_pte(sp->spt[i]))
 			continue;
@@ -771,12 +774,14 @@ 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)) {
+		rsvd_bits_set = is_rsvd_bits_set(&vcpu->arch.mmu, gpte,
+						 PT_PAGE_TABLE_LEVEL);
+		if (rsvd_bits_set || gfn != sp->gfns[i] ||
+		      !is_present_gpte(gpte) || !(gpte & PT_ACCESSED_MASK)) {
 			u64 nonpresent;
 
-			if (is_present_gpte(gpte) || !clear_unsync)
+			if (rsvd_bits_set || is_present_gpte(gpte) ||
+			      !clear_unsync)
 				nonpresent = shadow_trap_nonpresent_pte;
 			else
 				nonpresent = shadow_notrap_nonpresent_pte;
--
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