Messages in this thread | | | Date | Wed, 16 Apr 2014 14:17:08 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] KVM: x86: Fix page-tables reserved bits |
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On 04/16/2014 12:03 PM, Marcelo Tosatti wrote: >> @@ -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); > > Bit 7 is not reserved either, for the PDPTE (its PageSize bit). >
In long mode (IA-32e), bit 7 is definitely reserved.
-hpa
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