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

2015-12-01 Thread Wanpeng Li 
2015-11-26 16:34 GMT+08:00 Andrey Smetanin :
>
>
> On 11/26/2015 08:28 AM, Wanpeng Li wrote:
>>
>> 2015-11-25 23:20 GMT+08:00 Andrey Smetanin :
>>>
>>> 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
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Re: [PATCH v1 0/7] KVM: Hyper-V SynIC timers

2015-12-01 Thread Denis V. Lunev 

On 12/01/2015 01:12 PM, Wanpeng Li wrote:

2015-11-26 16:34 GMT+08:00 Andrey Smetanin :


On 11/26/2015 08:28 AM, Wanpeng Li wrote:

2015-11-25 23:20 GMT+08:00 Andrey Smetanin :

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

2015-11-26 Thread Andrey Smetanin 



On 11/26/2015 08:28 AM, Wanpeng Li wrote:

2015-11-25 23:20 GMT+08:00 Andrey Smetanin :

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



Regards,
Wanpeng Li


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

2015-11-26 Thread Wanpeng Li 
2015-11-26 16:34 GMT+08:00 Andrey Smetanin :
>
>
> On 11/26/2015 08:28 AM, Wanpeng Li wrote:
>>
>> 2015-11-25 23:20 GMT+08:00 Andrey Smetanin :
>>>
>>> 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

Cool, thanks.

Regards,
Wanpeng Li
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[PATCH v1 0/7] KVM: Hyper-V SynIC timers

2015-11-25 Thread Andrey Smetanin 
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.

Note: as implemented by this patch, all periodic timers are "lazy"
(i.e. if the vCPU wasn't scheduled for more than the timer period the
timer events are lost), regardless of the corresponding configuration
MSR.  If deemed necessary, the "catch up" mode (the timer period is
shortened until the timer catches up) will be implemented later.

The Hyper-V SynIC timers support is required to load winhv.sys
inside Windows guest on which guest VMBus devices depends on.

This patches depends on Hyper-V SynIC patches previosly sent.

Signed-off-by: Andrey Smetanin 
CC: Gleb Natapov 
CC: Paolo Bonzini 
CC: "K. Y. Srinivasan" 
CC: Haiyang Zhang 
CC: Vitaly Kuznetsov 
CC: Roman Kagan 
CC: Denis V. Lunev 
CC: qemu-de...@nongnu.org

Andrey Smetanin (7):
  drivers/hv: Move HV_SYNIC_STIMER_COUNT into Hyper-V UAPI x86 header
  drivers/hv: Move struct hv_message into UAPI Hyper-V x86 header
  kvm/x86: Rearrange func's declarations inside Hyper-V header
  kvm/x86: Added Hyper-V vcpu_to_hv_vcpu()/hv_vcpu_to_vcpu() helpers
  kvm/x86: Hyper-V internal helper to read MSR HV_X64_MSR_TIME_REF_COUNT
  kvm/x86: Hyper-V SynIC message slot pending clearing at SINT ack
  kvm/x86: Hyper-V SynIC timers

 arch/x86/include/asm/kvm_host.h|  13 ++
 arch/x86/include/uapi/asm/hyperv.h |  99 ++
 arch/x86/kvm/hyperv.c  | 367 -
 arch/x86/kvm/hyperv.h  |  54 --
 arch/x86/kvm/x86.c |   9 +
 drivers/hv/hyperv_vmbus.h  |  93 --
 include/linux/kvm_host.h   |   3 +
 7 files changed, 527 insertions(+), 111 deletions(-)

-- 
2.4.3

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

2015-11-25 Thread Wanpeng Li 
2015-11-25 23:20 GMT+08:00 Andrey Smetanin :
> 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?

Regards,
Wanpeng Li
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