[vfio-users] Switching to Q35

[Patrick O'Callaghan]

On Mon, 2018-12-31 at 23:01 +0100, Kővágó Zoltán wrote:
> On 2018-12-29 16:31, Alex Williamson wrote:
> > Use virtual machine manager again to create a Q35 VM and re-use your
> > disk image.  Note that this is the same as moving your disk from one
> > machine to another with potentially different disk and network
> > controllers.  If you're using virtio for both, you're probably fine
> > otherwise you might need to go back to the 440fx machine type and
> > install extra drivers to make it work.  Also be sure to maintain the
> > same firmware type in the VM, SeaBIOS or OVMF.  Switching between the
> > two for an existing VM image is non-trivial.  Thanks,
> 
> Hi,
> 
> Reading this thread I decided to try the switch. Since life is too short
> to figure out libvirt,

I find VMM easier than working my way through all the Qemu command-line 
options since I don't understand what most of them are for.

> I'm running qemu directly, so I just added -M q35
> and staryed my win8.1 vm and it worked, except, of course, the nvidia
> driver.
> 
> Looking at the device manager, on one vm it reverted to the standard vga
> driver, while on the other it displays my gpu as unknown device without
> a driver (but it displays the desktop on this unknown device!).
> If I select update driver, or try to manually reinstall the nvidia
> driver, I hear that device connected/reconnected sound, the screen turns
> off, then a few seconds later the vm just reboots.
> 
> Any idea what is the problem? Did anyone try this configuration? (OVMF +
> win8.1 x64 + nvidia gtx980 passthrough)

No idea, but it looks like a different problem from mine.

poc