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From: "Denis V. Lunev" <den@openvz.org>
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Date: Tue, 1 Dec 2015 13:28:28 +0300
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Subject: Re: [Qemu-devel] [PATCH v1 0/7] KVM: Hyper-V SynIC timers
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To: Wanpeng Li <kernellwp@gmail.com>, Andrey Smetanin <asmetanin@virtuozzo.com>
Cc: kvm <kvm@vger.kernel.org>, Gleb Natapov <gleb@kernel.org>, Haiyang Zhang <haiyangz@microsoft.com>, "qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>, Roman Kagan <rkagan@virtuozzo.com>, Paolo Bonzini <pbonzini@redhat.com>, Vitaly Kuznetsov <vkuznets@redhat.com>, "K. Y. Srinivasan" <kys@microsoft.com>

On 12/01/2015 01:12 PM, Wanpeng Li wrote:
> 2015-11-26 16:34 GMT+08:00 Andrey Smetanin <asmetanin@virtuozzo.com>:
>>
>> On 11/26/2015 08:28 AM, Wanpeng Li wrote:
>>> 2015-11-25 23:20 GMT+08:00 Andrey Smetanin <asmetanin@virtuozzo.com>:
>>>> 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