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

[thibaut noah]

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.
> >
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> >
>
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