Re: [Xen-users] Nvidia GeForce Passthrough Without Modifying to Quadro

[Gordan Bobic <gordan@xxxxxxxxxx>]

Perhaps, but in reality primary passthrough / vga=none
isn't really all that useful. It's not like SeaBIOS has
a configuration menu of any sort to view/use.

On Windows domU all you miss is the POST and splash screen.
On Linux you only miss the POST and the initial kernel boot
log until the GPU frame buffer driver loads.

It might be handy for things like seeing the grub menu
on the domU's physical monitor, but that's about it.

What is the actual use-case for primary passthrough?

On 2014-07-08 19:08, jacek burghardt wrote:
> There are interesting patches even for a kernel. I hope there is more
> Âmore work on vga=none.patch it would be nice to get qemu upstream
> working without cirus vga. Â ÂI wonder why kvm is more popular.
>
> On Tue, Jul 8, 2014 at 11:31 AM, Gordan Bobic <gordan@xxxxxxxxxx>
> wrote:
>
> > So, in the most recent drivers they check for actual CPU ID?
> > Wow. They really are running out of things to check for the
> > basis on which to decide whether to get the driver to not
> > initialize the card. Seems we are winning against Nvidia's
> > deliberate arbitrary crippling of GPU capabilities.
> >
> > My Nvidia cards are already modified to different device IDs,
> > so passthrough works anyway but it's nice to see that for
> > future generation cards I won't have to bother.
> >
> > They really have been well and truly busted, and not a
> > moment too soon.
> >
> > CPU ID string is, BTW, also what Intel used in the code
> > generated by their compiler to deliberately cripple code
> > runtime speeds on non-Intel CPUs. It did a string match
> > and if the CPU said "Genuine Intel", it enabled SSE code,
> > otherwise the compiled binary fell back on the slow
> > non-vectorized code.
> >
> > This is one of many reasons why closed source software
> > is evil.
> >
> > On 2014-07-08 18:10, jacek burghardt wrote:
> >
> > There are some interesting
> patchesÂhttps://bbs.archlinux.org/viewtopic.php?pid=1421204#p1421204
> > [1]
> > [3]
> https://forums.robertsspaceindustries.com/discussion/comment/2648502/#Comment_2648502
> > [2]
> > [4]
> >
> > I wonder if we can port kvm patches to xen ?
> >
> > On Wed, Jul 2, 2014 at 10:01 AM, jacek burghardt
> > <jaceksburghardt@xxxxxxxxx> wrote:
> >
> > Well I running ati cards I am waiting for my new R9 270. I be the
> > implementation of bios emulation will improve to a point were nvida
> > will no be able to tell if card is running under regular bios or
> > xen
> >
> > On Wed, Jul 2, 2014 at 9:11 AM, Gordan Bobic <gordan@xxxxxxxxxx>
> > wrote:
> > Good to hear another confirmation that it works. I wonder how
> > long it will be before Nvidia release a driver that uses a
> > different method to detect it is running in a VM so it can
> > not enable the GeForce cards in VMs again.
> >
> > On 2014-07-02 15:51, jacek burghardt wrote:
> >
> > I run xen 4.5 on arch linux with git version of qemu and seabios
> > and I
> > was able to pass old nvidia 220 Âcard that I had laying around.Â
> > https://bbs.archlinux.org/viewtopic.php?id=162768&p=91 [3] [1] [1]
> >
> > Links:
> > ------
> > [1] https://bbs.archlinux.org/viewtopic.php?id=162768&amp;p=91 [3]
> > [1]
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-users [4] [2]
> >
> > Links:
> > ------
> > [1] https://bbs.archlinux.org/viewtopic.php?id=162768&amp;p=91 [3]
> > [2] http://lists.xen.org/xen-users [4]
> > [3] https://bbs.archlinux.org/viewtopic.php?pid=1421204#p1421204
> > [1]
> > [4]
> https://forums.robertsspaceindustries.com/discussion/comment/2648502/#Comment_2648502
> > [2]
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-users [4]
>  _______________________________________________
>  Xen-users mailing list
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>
>
> Links:
> ------
> [1] https://bbs.archlinux.org/viewtopic.php?pid=1421204#p1421204
> [2]
> https://forums.robertsspaceindustries.com/discussion/comment/2648502/#Comment_2648502
> [3] https://bbs.archlinux.org/viewtopic.php?id=162768&amp;p=91
> [4] http://lists.xen.org/xen-users
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