Re: [Xen-devel] Question about "xen: Revert commits da72ff5bfcb0 and 72a9b186292d"

[Jean-Louis Dupond <jean-louis@xxxxxxxxx>]

Hi Juergen,

We run Xen as dom0 with Windows domU's.

Now with older 4.9.x kernels, we had BSOD's when we booted a domU with 
old Xen drivers in it.
With the newest kernel (4.9.34), this seems to be resolved.

I was wondering what caused this. And that patch triggered my attention 
:)
Thanks
Jean-Louis

Op 2017-07-04 14:40, schreef Juergen Gross:
> On 04/07/17 13:54, Jean-Louis Dupond wrote:
> > Hi All,
> >
> > We had some issues with BSOD's on Windows at startup when using some 
> > old
> > Xen drivers inside Windows.
> > Now when we upgrade to the most recent 4.9.x kernel. The issue seems 
> > to
> > be resolved.
> >
> > Could it be that the following commit fixes the issue:
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=84d582d236dc1f9085e741affc72e9ba061a67c2
> >
> > ?
> >
> > As far as I can see it only breaks Xen < 4.0. But could it be it also
> > breaks Windows VM's with old Xen drivers?
> Umm, I don't get it.
>
> Are you using Windows or Linux? Above commit is for the Linux kernel
> running as HVM domain. It shouldn't be able to modify behavior of a
> Windows guest at all.
>
>
> Juergen
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