On 2019-01-01 10:50, Patrick O'Callaghan wrote: > 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.
It looks like the problem is introduced with the commit b2fc91db84470a78f8e93f5b5f913c17188792c8 which will be part of the next qemu release. To solve this problem I can either use `-M pc-q35-3.1` or (probably more preferably) add `-machine kernel_irqchip=on` to the options. Could anyone who use q35 with win 8.1 and nvidia, download and compile the latest qemu git and confirm it? (Alternatively using 3.1 you can specify `-machine kernel_irqchip=split`, it specifies the new default setting). Regards, Zoltan _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
