Re: Question about "xen: Revert commits da72ff5bfcb0 and 72a9b186292d"

[Jean-Louis Dupond <jean-louis@dupond.be>]

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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