[Xen-devel] Discussion on whether to continue with the patches for Xen 4.5 Re: [v6][PATCH 2/2] xen:vtd: missing RMRR mapping while share EPT

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.09.14 at 15:55, <konrad.wilk@xxxxxxxxxx> wrote:
> On Thu, Sep 25, 2014 at 04:14:28PM +0100, Jan Beulich wrote:
>> >>> On 25.09.14 at 16:12, <konrad.wilk@xxxxxxxxxx> wrote:
>> > What are the non-bugs (features) that we speak of?
>> 
>> There are no non-bug changes here. It's just that the issue has
>> always been there, so is also not a regression.
> 
> OK, patches do not introduce regressions - but they fix bugs
> with PCIe passthrough devices (especially when passing in USB and GPUs?).

Whether the full eventual patch set introduce regressions I don't
know - I would hope not, but you never know. The two patches
discussed here do introduce at least what one could perceive as
regression: A device previously passing through fine to a guest
may all of the sudden no longer do so.

But what I was trying to say above wasn't anything related to
whether the patches introduce regressions, but that the patches
don't _fix_ any regression - the brokenness was always there.

All of the questions you raised further down are likely misaddressed
at me - they would need answering by the respective patch
authors.

Jan


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