Re: [Xen-devel] (partial) Spectre v2 mitigation without on Skylake IBRS

[Juergen Gross <jgross@xxxxxxxx>]

On 26/02/18 14:11, Jan Beulich wrote:
>>>> On 26.02.18 at 13:36, <jgross@xxxxxxxx> wrote:
>> On 26/02/18 11:49, Jan Beulich wrote:
>>>>>> On 26.02.18 at 11:18, <jgross@xxxxxxxx> wrote:
>>>> If this is the case I believe the easiest solution would be to let the
>>>> kernel set the MSR again after leaving suspended state. suspend/resume
>>>> require hooks in pv kernels after all.
>>>
>>> Hmm, this could be leveraged irrespective of what I've written
>>> above - the kernel could then also clear the MSR during suspend,
>>> thus allowing the check in libxc to pass.
>>
>> Something like the attached patch?
> 
> With proper checking added of whether the MSR actually exists,
> yes, I think so. Will need to see how this can be converted to
> something that works on the old XenoLinux trees.

Okay, will post the (modified) patch to lkml.


Juergen

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