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Re: [Xen-devel] xsave=0 workaround needed on 3.2 kernels with Xen 4.1 or Xen-unstable.

On Thu, May 3, 2012 at 2:15 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>> On 02.05.12 at 20:42, AP <apxeng@xxxxxxxxx> wrote:
>> On Wed, May 2, 2012 at 2:00 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>>>> On 30.04.12 at 21:37, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
>>>>>> wrote:
>>>> I somehow thought that this has been fixed but I've been
>>>> getting reports that people are running into this.
>>> "this" being what? I too thought that all xsave related issues were
>>> sorted out by now.
>> I see the following crash if I run without xsave=0 with Ubuntu 11.10
>> 3.0.0-17 kernel (Intel(R) Core(TM) i7-2620M). I don't see this with
>> Xen 4.1.2. Looks like the OSXSAVE bit is not getting set in CR4.
> And in the thread starting at
> http://lists.xen.org/archives/html/xen-devel/2012-04/msg00426.html
> I gave debugging instructions that apparently no-one followed so
> far. Without someone seeing the problem doing so I don't think we
> will ever get anywhere with this (unless, as also indicated there,
> someone can spot something wrong with the code that non-obvious
> to everyone else).

I missed that thread. I will add some debugging to
pv_guest_cr4_fixup() and the XSETBV handling in
emulate_privileged_op() and post the output.


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