[vfio-users] Hyper-v enlightments on recent NVIDIA drivers?

[thibaut noah]

I think it is the same alex pasted a post before.
What forum? I'm in my mail box, we have a forum?

2016-04-14 8:02 GMT+02:00 Jonathan Scruggs <j.scruggs at gmail.com>:

> Search this email forum. Gerd posted a script you can use with libvirt.
> It's in reply to my patch.
> On 13 Apr 2016 21:18, "thibaut noah" <thibaut.noah at gmail.com> wrote:
>
>> The problem i have is i use libvirt, putting the flag on qemu-arg
>> requires to set cpu again.
>> As i have no idea which cpu setting will be used this doesn't seem like a
>> good idea, i saw that people use scripts apparently but i wonder if someone
>> figured out how to put this directly into libvirt
>>
>> 2016-04-13 20:37 GMT+02:00 Colin Godsey <crgodsey at gmail.com>:
>>
>>> Qemu 2.5+ supports the hv_vendor_id flag that lets you change the vendor
>>> ID. It was discovered that this is whats used by the nvidia drivers to
>>> detect hyper-v, so changing the vendor ID allows you to use all the
>>> enlightenments without upsetting nvidia
>>>
>>> On Tue, Apr 12, 2016 at 4:51 PM thibaut noah <thibaut.noah at gmail.com>
>>> wrote:
>>>
>>>> Hey guys, any news on that? More performances is always better,
>>>> wondering if there are been some changes recently since it is a few months
>>>> old
>>>>
>>>> 2015-12-05 18:04 GMT+01:00 Doug Applegate <doug.applegate at gmail.com>:
>>>>
>>>>> Hi!
>>>>>
>>>>> I got excited after hearing that the latest Nvidia driver doesn't
>>>>> check Hyper-V. So I tried it on my Skylake Windows 10 VM using GTX970.
>>>>> Unfortunately it doesn't work for me using Fedora 23 and stock qemu.
>>>>> Windows reports the driver reports errors.
>>>>>
>>>>> I'm curious how you got it to work or where you read that it should.
>>>>> I'm using nvidia driver version 359.06
>>>>>
>>>>> Thanks
>>>>>
>>>>>
>>>>>
>>>>> On Sat, Dec 5, 2015 at 4:21 AM, Eddie Yen <missile0407 at gmail.com>
>>>>> wrote:
>>>>> >
>>>>> >
>>>>> > 2015-12-05 19:02 GMT+08:00 Ruben Torrero Marijnissen
>>>>> > <ruben.torrero at gmail.com>:
>>>>> >>
>>>>> >> Hi,
>>>>> >>
>>>>> >> I installed last week a Windows 10 guest on my flaming new Skylake
>>>>> >> build, on top of my Arch Linux install. After doing some reading, I
>>>>> >> understood I had to disable any Hyper-V enlightment and make KVM
>>>>> run in
>>>>> >> 'hidden' mode, so my Nvidia drivers wouldn't shut down.
>>>>> >>
>>>>> >> However, just for the curiosity, I googled for a while and found the
>>>>> >> last version that didn't check for KVM presence and tested the
>>>>> >> different performance with and without Hyper-V enlightments: Oddly,
>>>>> >> Unigine benchmark doesn't show almost *any* performance gain, but
>>>>> with
>>>>> >> several games, the difference can be as big as 50% in heavily loaded
>>>>> >> scenarios. My guess on this games that rely more on the GPU won't
>>>>> see
>>>>> >> much improvements, but games that also use I/O and CPU extensively
>>>>> will
>>>>> >> see a big improvement. Any idea what other reasons there could be?
>>>>> >
>>>>> >
>>>>> > IME, if you didn't add any signs in -cpu tag, or if you deleted any
>>>>> Hvper-V
>>>>> > signs in VM XML file, it will disabled Hyper-V functions.
>>>>> >
>>>>> > And, there are many games will got unstable performance without
>>>>> Hyper-V,
>>>>> > especially online games and games that use a lot of mappings.
>>>>> > I got huge performance differences on 3DMark tests. With Hyper-V, I
>>>>> can got
>>>>> > about 103xx, BUT i got only 95xx when I disabled Hyper-V.
>>>>> >
>>>>> > If Hyper-V checker has removed since newest driver, it's a good
>>>>> news, but
>>>>> > still need to test it.
>>>>> > Also, some graphic cards only can use previous driver, especially
>>>>> using in
>>>>> > old OS.
>>>>> >
>>>>> >>
>>>>> >> I also read in a forum (
>>>>> https://lime-technology.com/forum/index.php?top
>>>>> >> ic=43824.0) that Alex Williamson is working on a QEMU patch to allow
>>>>> >> Windows guests to use Hyper-V enlightments without Nvidia beeing
>>>>> able
>>>>> >> to detect is. Is this true?. Where could I follow the development /
>>>>> >> test it?
>>>>> >
>>>>> >
>>>>> > You can get that patch by downloading QEMU with git version.
>>>>> >
>>>>> > _______________________________________________
>>>>> > vfio-users mailing list
>>>>> > vfio-users at redhat.com
>>>>> > https://www.redhat.com/mailman/listinfo/vfio-users
>>>>> >
>>>>>
>>>>> _______________________________________________
>>>>> vfio-users mailing list
>>>>> vfio-users at redhat.com
>>>>> https://www.redhat.com/mailman/listinfo/vfio-users
>>>>>
>>>>
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>>
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