Re: [Xen-devel] [PATCH V3] xen/vm_event: Clean up control-register-write vm_events

[Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>]

On Wed, May 20, 2015 at 5:24 PM, Razvan Cojocaru
<rcojocaru@xxxxxxxxxxxxxxx> wrote:
> On 05/20/2015 05:53 PM, Jan Beulich wrote:
>>>>> On 19.05.15 at 10:31, <rcojocaru@xxxxxxxxxxxxxxx> wrote:
>>> The CR0, CR3 and CR4 events are
>>> now pre-write vm_events.
>>
>> I didn't get the impression you and Tamas had already settled on
>> whether this is the way to go forward.
>
> I took Tamas' previous comment ("IMHO there is not much point in having
> two distinct event types (PRE/POST).") to mean that he agrees that if we
> aim for consistency, we need to have the CR and MSR events behave the
> same way.
>
> Tamas did indeed question whether or not post-write (vs. pre-write) CR
> events matter from the guest perspective, and I've explained why this
> does matter to the monitoring application, from both an architectural
> and efficiency perspective.
>
> Of course, if there is more to discuss, by all means. We should all
> agree on how to go forward. Tamas, did I misunderstand your position?

Ack, I see your point and it make sense to do it this way!

Cheers,
Tamas

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