[vfio-users] [Qemu-discuss] vfio pass through only works once after reboot

[José Ramón Muñoz Pekkarinen]

	Hi Lucas,

	Do you mind to post your qemu script? I'm having problems trying to 
passthrough a vga through OVMF and I'd like to see more examples.

	Thanks!

	José.

On Friday 04 September 2015 11:51:42 Lucas Neves wrote:
> I'm very interested in the solution to this problem as well. I pass through
> a Radeon r9 285 (Tonga) to Windows.
> 
> On my previous setup, with QEMU from the git emulating a Q35 chipset on
> SeaBIOS and a Windows 8.1 guest, the guest would work only once per boot of
> the host. If I soft-reset the guest or shut it down and tried to run QEMU
> again, the guest monitor would stay blank (although QEMU would continue
> running, with no error messages). I have noticed that this problem only
> occurs when using the proprietary AMD driver in the guest: running on the
> native Windows 8.1 video driver, the guest could reboot without problems.
> 
> This week, I decided to change the whole system, hoping that something
> would fix this problem. So now I'm emulating a i440fx chipset, using OVMF,
> with a fresh install of Windows 10 as guest. Things have improved: now the
> guest system can withstand soft reboots without problems. But whenever I
> shut down the guest machine, it is still not possible to turn it on again
> without rebooting the host.
> 
> Sorry I don't have my start script here, I can post it later if necessary.
> But I inkove QEMU as a super user (sudo qemu-system-x86_64). And my host OS
> is Ubuntu 15.04.
> 
> Thanks,
> Lucas
> 
> On Thu, Sep 3, 2015 at 3:39 PM Blank Field <ihatethisfield at gmail.com> wrote:
> > There is a special mailing list for all the vfio questions. It aims to
> > replace the arch forum thread.
> > 
> > http://lists.nongnu.org/archive/html/qemu-discuss/2015-09/msg00003.html
> > I couldn't manage to not screw up the formatting with G-Mail, so there you
> > have it as a link to archives.
> > 
> > Regarding the problem - i don't remember exactly, but running qemu as a
> > regular user requires some more steps than just chown.
> > _______________________________________________
> > vfio-users mailing list
> > vfio-users at redhat.com
> > https://www.redhat.com/mailman/listinfo/vfio-users