Re: [PATCH 1/3] KVM: x86: assign two bits to track SPTE kinds

[Junaid Shahid]

On 9/26/19 10:18 AM, Paolo Bonzini wrote:
> Currently, we are overloading SPTE_SPECIAL_MASK to mean both
> "A/D bits unavailable" and MMIO, where the difference between the
> two is determined by mio_mask and mmio_value.
> 
> However, the next patch will need two bits to distinguish
> availability of A/D bits from write protection.  So, while at
> it give MMIO its own bit pattern, and move the two bits from
> bit 62 to bits 52..53 since Intel is allocating EPT page table
> bits from the top.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> ---

Reviewed-by: Junaid Shahid <junaids@xxxxxxxxxx>