Re: [Xen-devel] [PATCH V8] xen/vm_event: Clean up control-register-write vm_events and add XCR0 event

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On 06/02/2015 06:39 PM, Ian Campbell wrote:
> On Fri, 2015-05-29 at 16:45 +0300, Razvan Cojocaru wrote:
>> As suggested by Andrew Cooper, this patch attempts to remove
>> some redundancy and allow for an easier time when adding vm_events
>> for new control registers in the future, by having a single
>> VM_EVENT_REASON_WRITE_CTRLREG vm_event type, meant to serve CR0,
>> CR3, CR4 and (newly introduced) XCR0. The actual control register
>> will be deduced by the new .index field in vm_event_write_ctrlreg
>> (renamed from vm_event_mov_to_cr). The patch has also modified
>> the xen-access.c test - it is now able to log CR3 events.
>>
>> Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
>> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> Seems ok from the tools and arm side, so long as the xen-access.c test
> is likely to build on ARM despite the new x86-isms (it looks like it to
> me) and the following Q:

I think it should compile (though of course no events will be
delivered), but I'm also happy to drop the xen-access.c patch
completely. It's just been useful for me as a test and I thought it
might be helpful for somebody else, but certainly it's not required.

It would seem to be the simplest solution, the #ifdeffery for future ARM
events is probably not worth it.


Thanks,
Razvan


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