Re: [Xen-devel] [PATCH v2 3/3] x86/viridian: Add partition time reference counter MSR support

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.08.14 at 17:11, <Paul.Durrant@xxxxxxxxxx> wrote:
>> From: Paul Durrant
>> I think that hvm_get_guest_time() should have the right semantics after all,
>> in that it appears to be ns since a vcpu was onlined and is preserved across
>> save/restore.
> 
> Actually, I'm no longer convinced about that second part. It looks like only 
> TSC is preserved across save/restore.

Indeed the saving/restoring would need to be written, similar to what
is done for the other virtual time sources. And just like for those other
system wide time sources, you'd have to pick a reference vCPU.

Jan


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