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

[Diana Crisan <dcrisan@flexiant.com>]

On 04/06/13 14:59, Alex Bligh wrote:
>
>
> --On 4 June 2013 14:09:31 +0100 George Dunlap 
> <george.dunlap@eu.citrix.com> 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 Monné <roger.pau@citrix.com>
>>> Cc: Keir Fraser <keir@xen.org>
>>> Cc: Jan Beulich <jbeulich@suse.com>
>>> Cc: George Dunlap <george.dunlap@eu.citrix.com>
>>
>> Reviewed-by: George Dunlap <george.dunlap@eu.citrix.com>
>>
>> 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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