Re: [Xen-devel] [PATCH] x86: re-enable VCPUOP_register_vcpu_time_memory_area

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.05.13 at 18:15, Matt Wilson <msw@xxxxxxxxxx> wrote:
> On Thu, May 16, 2013 at 04:01:33PM +0100, Jan Beulich wrote:
>> >>> On 16.05.13 at 16:40, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
>> > On Thu, 2013-05-16 at 09:47 +0100, Jan Beulich wrote:
>> >> Regardless of the code freeze I'd still like to propose this for
>> >> inclusion in 4.3, mainly based on the fact that this got disabled late
>> >> in the 4.0 release cycle with the expectation that it would get
>> >> re-enabled soon after. Now that upstream Linux also has, as of 3.8 at
>> >> least on x86-64, the necessary hypervisor independent support code, it
>> >> would be odd to not leverage this on Xen.
>> > 
>> > I went looking for a call to VCPUOP_register_vcpu_time_memory_area in
>> > 3.10-rc1 and can't find it -- what have I missed?
>> 
>> The words "hypervisor independent" in my explanation. Iirc Jeremy
>> had a patch, and the non-Xen pieces got extracted from it for KVM
>> (in 3.8 I think). The Xen parts would need to be recovered and
>> pushed upstream. The way I did this for our kernel isn't even coming
>> close to what would be needed for upstreaming.
> 
> Does this look like the right bit of old code? 
>   https://lkml.org/lkml/2009/10/5/391 

Yes, it does. But from a cursory look it'll need quite a bit up updating/
polishing.

Jan


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