Avi Kivity wrote:
> On 03/22/2010 11:13 AM, Sheng Yang wrote:
>>
>>> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
>>> index 06108f3..f971b9b 100644
>>> --- a/arch/x86/kvm/vmx.c
>>> +++ b/arch/x86/kvm/vmx.c
>>> @@ -1804,9 +1804,15 @@ static u64 construct_eptp(unsigned long root_hpa)
>>> {
>>> u64 eptp;
>>>
>>> - /* TODO write the value reading from MSR */
>>> - eptp = VMX_EPT_DEFAULT_MT |
>>> - VMX_EPT_DEFAULT_GAW<< VMX_EPT_GAW_EPTP_SHIFT;
>>> + if (cpu_has_vmx_eptp_writeback())
>>> + eptp = VMX_EPT_MT_WRBACK |
>>> + VMX_EPT_DEFAULT_GAW<< VMX_EPT_GAW_EPTP_SHIFT;
>>>
>> I prefer to ensure WB is supported and used as default. Otherwise it
>> would be
>> a big trouble for memory subsystem(to use UC for all memory). Both WB
>> and UC
>> EPT memory types are ensured to be support in hardware.
>>
>> And you can remove VMX_EPT_DEFAULT_MT as well.
>>
>
> I agree, hopefully we never ever see a cpu that doesn't support EPT WB.
OK, seems we don't need to have this concern. :)
>
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