RE: Use rsvd_bits_mask in load_pdptrs for cleanup and considing EXB bit

["Dong, Eddie" <eddie.dong@intel.com>]

Dong, Eddie wrote:
> This is followup of rsvd_bits emulation.
> 
Base on new rsvd_bits emulation patch.
thx, eddie


commit 2c1472ef2b9fd87a261e8b58a7db11afd6a111dc
Author: root <root@eddie-wb.localdomain>
Date:   Mon Mar 30 17:05:47 2009 +0800

    Use rsvd_bits_mask in load_pdptrs for cleanup with EXB bit considered.
    
    Signed-off-by: Eddie Dong <Eddie.Dong@intel.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 2eab758..eaf41c0 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -225,11 +225,6 @@ static int is_nx(struct kvm_vcpu *vcpu)
 	return vcpu->arch.shadow_efer & EFER_NX;
 }
 
-static int is_present_pte(unsigned long pte)
-{
-	return pte & PT_PRESENT_MASK;
-}
-
 static int is_shadow_present_pte(u64 pte)
 {
 	return pte != shadow_trap_nonpresent_pte
@@ -2199,6 +2194,9 @@ void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, int level)
 		context->rsvd_bits_mask[1][0] = 0;
 		break;
 	case PT32E_ROOT_LEVEL:
+		context->rsvd_bits_mask[0][2] = exb_bit_rsvd |
+			rsvd_bits(maxphyaddr, 62) |
+			rsvd_bits(7, 8) | rsvd_bits(1, 2);	/* PDPTE */
 		context->rsvd_bits_mask[0][1] = exb_bit_rsvd |
 			rsvd_bits(maxphyaddr, 62);		/* PDE */
 		context->rsvd_bits_mask[0][0] = exb_bit_rsvd |
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 258e5d5..2a6eb50 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -75,4 +75,9 @@ static inline int is_paging(struct kvm_vcpu *vcpu)
 	return vcpu->arch.cr0 & X86_CR0_PG;
 }
 
+static inline int is_present_pte(unsigned long pte)
+{
+	return pte & PT_PRESENT_MASK;
+}
+
 #endif
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 961bd2b..b449ff0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -233,7 +233,8 @@ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 		goto out;
 	}
 	for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
-		if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
+		if (is_present_pte(pdpte[i]) &&
+		    (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
 			ret = 0;
 			goto out;
 		}