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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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.

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel