Re: [Xen-devel] [PATCH v2] x86/vtsc: update vcpu_time in hvm_set_guest_time

[Diana Crisan <dcrisan@xxxxxxxxxxxx>]

On 04/06/13 14:59, Alex Bligh wrote:
> --On 4 June 2013 14:09:31 +0100 George Dunlap 
> <george.dunlap@xxxxxxxxxxxxx> wrote:
> > On 06/04/2013 01:49 PM, Roger Pau Monne wrote:
> > > When using a vtsc, hvm_set_guest_time changes hvm_vcpu.stime_offset,
> > > which is used in the vcpu time structure to calculate the
> > > tsc_timestamp, so after updating stime_offset we need to propagate the
> > > change to vcpu_time in order for the guest to get the right time if
> > > using the PV clock.
> > >
> > > Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
> > > Cc: Keir Fraser <keir@xxxxxxx>
> > > Cc: Jan Beulich <jbeulich@xxxxxxxx>
> > > Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> > Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> >
> > Diana / Alex, want to give this one a spin?
> We will do. If it works we will test a 4.2.2 backport too.
I have tested patch-v2 with xen4.3 and it did not get a clock stuck yet 
across mutiple migrations between hosts (i.e. not localhost). I have 
patched in v3 and will do some further stress testing tomorrow. Once it 
works I will also test a backport to 4.2.2 and also give an update.
Thanks,
Diana


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