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



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 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 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 gmail com> wrote:
>
>
> 2015-12-05 19:02 GMT+08:00 Ruben Torrero Marijnissen
> <ruben torrero 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.
>
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