Re: [PATCH 1/5] mmu: mark spte present if the x bit is set

Paolo Bonzini
2016-07-05T10:50:25Z

On 05/07/2016 05:06, Wanpeng Li wrote:
> 2016-06-29 4:49 GMT+08:00 Paolo Bonzini <pbonzini@redhat.com>:
> [...]
>>
>> I think another way to write it is "(pte & 0xFFFFFFFFull) &&
>> !is_mmio_spte(pte)", since non-present/non-MMIO SPTEs never use bits
>
> I misunderstand it here, this will also treat -W- EPT SPTEs as present, right?

-W- EPT SPTEs are present but invalid. They should never happen unless
they are MMIO SPTEs (in which case !is_mmio_spte(pte) will return true
and the function will return false).

Paolo

> Regards,
> Wanpeng Li
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