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Gmane

From: Jan Beulich <JBeulich <at> suse.com>
Subject: Re: [PATCH] x86/fpu: CR0.TS should be set before trap into PV guest's #NM exception handler
Newsgroups: gmane.comp.emulators.xen.devel
Date: Thursday 27th February 2014 08:00:56 UTC (over 4 years ago)
>>> On 27.02.14 at 01:04, Matt Wilson  wrote:
> On Wed, Nov 06, 2013 at 08:51:56AM +0000, Jan Beulich wrote:
>> Nevertheless I agree that there is an issue, but this needs to be
>> fixed on the Linux side (hence adding the Linux maintainers to Cc);
>> this issue was introduced way back in 2.6.26 (before that there
>> was no allocation on that path). It's not clear though whether
>> using GFP_ATOMIC for the allocation would be preferable over
>> stts() before calling the allocation function (and clts() if it
>> succeeded), or whether perhaps to defer the stts() until we
>> actually know the task is being switched out. It's going to be an
>> ugly, Xen-specific hack in any event.
> 
> Was there ever a resolution to this problem? I never saw a comment
> from the Linux Xen PV maintainers.

Neither did I, so no, I'm not aware of a solution.

Jan
 
CD: 3ms