Re: [RFC][PATCH] KVM: SVM: Sync g_pat with guest-written PAT value

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2015-04-20 19:37, Jan Kiszka wrote:
> On 2015-04-20 19:33, Radim Krčmář wrote:
>> 2015-04-20 19:21+0200, Jan Kiszka:
>>> On 2015-04-20 19:16, Radim Krčmář wrote:
>>>> 2015-04-20 18:14+0200, Radim Krčmář:
>>>>> Tested-by: Radim Krčmář <rkrcmar@redhat.com>
>>>>
>>>> Uncached accesses were roughly 20x slower.
>>>> In case anyone wanted to reproduce, I used this as a kvm-unit-test:
>>>>
>>>> ---
>> | [code]
>>>
>>> Great, thanks. Will you push it to the unit tests? Could raise
>>> motivations to fix the !NPT/EPT case.
>>
>> It can't be included in `run_tests.sh`, because we intenionally ignore
>> PAT for normal RAM on VMX and the test does "fail" ...
> 
> That ignoring is encoded into the EPT? Hmm... Maybe we can create a
> ivshmem device and use that as test target.

And do you also know why is it ignored on Intel? Side effects on the host?

Jan

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