Re: [Qemu-devel] [PATCH v1 0/7] KVM: Hyper-V SynIC timers

[Denis V. Lunev]

On 12/01/2015 01:12 PM, Wanpeng Li wrote:
> 2015-11-26 16:34 GMT+08:00 Andrey Smetanin <address@hidden>:
> > On 11/26/2015 08:28 AM, Wanpeng Li wrote:
> > > 2015-11-25 23:20 GMT+08:00 Andrey Smetanin <address@hidden>:
> > > > Per Hyper-V specification (and as required by Hyper-V-aware guests),
> > > > SynIC provides 4 per-vCPU timers.  Each timer is programmed via a pair
> > > > of MSRs, and signals expiration by delivering a special format message
> > > > to the configured SynIC message slot and triggering the corresponding
> > > > synthetic interrupt.
> > >
> > > Could you post a link for this specification?
> >
> > Official link:
> >
> > http://download.microsoft.com/download/A/B/4/AB43A34E-BDD0-4FA6-BDEF-79EEF16E880B/Hypervisor%20Top%20Level%20Functional%20Specification%20v4.0.docx
> >
> > and there is a pdf variant(my own docx -> pdf conversion):
> >
> > https://www.dropbox.com/s/ehxictr5wgnedq7/Hypervisor%20Top%20Level%20Functional%20Specification%20v4.0.pdf?dl=0
> Btw, is there performance data for such feature?
>
> Regards,
> Wanpeng Li
not yet.

This is a requirement for any Hyper-V device emulation
to be activated by Windows. We are going to have
basic infrastructure merged and run performance tests
with all that stuff done.

Den