KVM: x86: Fix page-tables reserved bits

KVM does not handle the reserved bits of x86 page tables correctly:
In PAE, bits 5:8 are reserved in the PDPTE.
In IA-32e, bit 8 is not reserved.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 813d310..668ae59 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3538,7 +3538,7 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
        case PT32E_ROOT_LEVEL:
                context->rsvd_bits_mask[0][2] =
                        rsvd_bits(maxphyaddr, 63) |
-                       rsvd_bits(7, 8) | rsvd_bits(1, 2);      /* PDPTE */
+                       rsvd_bits(5, 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 |
@@ -3550,9 +3550,9 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
                break;
        case PT64_ROOT_LEVEL:
                context->rsvd_bits_mask[0][3] = exb_bit_rsvd |
-                       rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8);
+                       rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 7);
                context->rsvd_bits_mask[0][2] = exb_bit_rsvd |
-                       rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8);
+                       rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 7);
                context->rsvd_bits_mask[0][1] = exb_bit_rsvd |
                        rsvd_bits(maxphyaddr, 51);
                context->rsvd_bits_mask[0][0] = exb_bit_rsvd |