Re: [PATCH v2 2/5] KVM: MMU: check guest CR3 reserved bits based on its physical address width.

[Paolo Bonzini]

On 17/08/2017 21:52, Yu Zhang wrote:
> +             if (efer & EFER_LMA) {
> +                     u64 maxphyaddr;
> +                     u32 eax = 0x80000008;
> +
> +                     if (ctxt->ops->get_cpuid(ctxt, &eax, NULL, NULL, NULL,
> +                                              NO_CHECK_LIMIT)) {
> +                             maxphyaddr = eax & 0xff;
> +                             rsvd = rsvd_bits(maxphyaddr, 62);
> +                     }

You should use 36 here if ctxt->ops->get_cpuid returns false, for
consistency with cpuid_query_maxphyaddr.

Paolo