Re: [Xen-devel] [v6][PATCH 2/2] xen:vtd: missing RMRR mapping while share EPT

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.09.14 at 04:42, <kevin.tian@xxxxxxxxx> wrote:
>>  From: Chen, Tiejun
>> Sent: Tuesday, September 16, 2014 6:01 PM
>> On 2014/9/16 9:24, Chen, Tiejun wrote:
>> > Jan,
>> >
>> > What's your last judgement?
>> >
>> > Could we apply these two separate patches in advance? I think actually
>> > they aren't blocking the remains what we tried to do in another RFC
>> > series, but now we really need them to make sure GFX passthrough can
>> > work well.
>> >
>> > For that RFC I have to take more time to cover all scenarios, so as you
>> > saw its really a slow process I can push forward.
>> 
>> Any consideration?
>> 
> 
> Given the facts that:
> 
> - earlier two patches can fix an important usage of GPU pass-through for
> Windows VM
> 
> - earlier two patches don't make things worse
> 
> - current patch set still needs quite some effort for a robust RMRR 
> implementation
> 
> I'd suggest taking earlier two patches to catch 4.5 release, while the
> big patch set is ongoing developed.

For the record: I'm intending to take another look, but as time permits.
For now my position stands that I don't look forward to take just those
two patches. This is based on the bad experience we had with the
promise by Intel to work on implementing large page support for non-
shared EPT/VT-d page tables in order to get a smaller scale fix
accepted into 4.4. I'm not going to rely on promises of this kind again,
and hence I'm willing to accept said patches only if they have no
drawbacks (figuring this out is what I actually need some more time
than to just write an email).

Jan


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