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Re: [Xen-devel] [BUG] After upgrade to Xen 4.12.0 iommu=no-igfx



On Tue, Aug 13, 2019 at 12:24:32PM -0700, Roman Shaposhnik wrote:
> Hi Roger,
> 
> sorry for the delay -- I hope you will understand that I actually had
> a good reason. See below:

No problem, just wanted to make sure this doesn't fell through the
cracks.

> On Mon, Aug 12, 2019 at 1:57 AM Roger Pau Monné <roger.pau@xxxxxxxxxx> wrote:
> >
> > Ping?
> >
> > I know I've posted this quite recently, but have you been able to test
> > the two proposed patches?
> >
> > ie: the one here and:
> >
> > https://lists.xenproject.org/archives/html/xen-devel/2019-08/msg00643.html
> >
> > I would like to figure out exactly what's going on and fix this
> > properly.
> 
> Turns out this may actually be related to the BIOS version on these
> boxes. I have
> one with the BIOS build from 06/07/2018 and the other one is from 2017. So 
> with
> 2 of your proposed patches -- we now have a 2x2 test matrix. The awful
> part seems
> to be that the behavior looks to be slightly different.
> 
> I need an extra day to summarize it all and I'll follow up quickly. It
> just so far I lost
> time trying to figure out while the same build would behave
> differently on different
> boxes only to find out that the BIOS is different (and the really
> awful part is that
> they both report as version 5.0.1.1 -- it is only when you look at the 
> timestamp
> of the build -- that's where you see them being different :-( ).

Oh, that's awful. I hope you can get something clear out of this.

Roger.

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