[vfio-users] No reset on GT730

[Nicolas Roy-Renaud]

You can't really reset a card using SeaBIOS because it uses VGA 
arbitration, which has little to do with how an actual PCI passthrough 
would work IIRC. What makes you so sure that the issue comes from the 
gpu not resetting, is dmesg returning anything suspicious or is your 
qemu command completing successfully after you shutdown your VM? If 
you're not using libvirt, qemu is supposed to log error messages in the 
standard error stream instead, does anything abnormal come up when the 
VM shuts down?


- Nicolas


On 2016-07-04 15:46, Gerhard de Clercq wrote:
>
> I was actually running though command line so no libvirt log and I 
> didn't see anything in journalctl though I'm not entirely sure what to 
> look for. I do indeed pass some other devices. I also saw in dmesg dat 
> vfio-pci was warning about the ROM being invalid when I tried to start 
> a VM the second or later time but passing a vgabios explicitly didn't 
> make any difference. Here is my command:
>
>
> sudo qemu-system-x86_64 -enable-kvm -M q35 -m 4G -cpu 
> core2duo,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff,kvm=off,hv_vendor_id=badapple 
> -smp 4,sockets=1,cores=2,threads=2  -bios OVMF.fd -device 
> ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1 -device 
> i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1e -device 
> pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x1 -device 
> piix3-usb-uhci,id=usb,bus=pci.2,addr=0x1 -device 
> ahci,id=sata0,bus=pci.2,addr=0x5 -drive 
> file=./Untitled.iso,if=none,id=drive-sata0-0-2,format=raw -device 
> ide-hd,bus=ide.2,drive=drive-sata0-0-2,id=sata0-0-2,bootindex=1 -drive 
> file=./nomachine.qcow2,if=none,media=disk,id=drive-sata0-0-0,format=qcow2 
> -device ide-hd,bus=sata0.0,drive=drive-sata0-0-0,id=sata0-0-0 -smbios 
> type=2 -serial stdio -device 
> vfio-pci,host=05:00.0,bus=pcie.0,multifunction=on -device 
> vfio-pci,host=05:00.1,bus=pcie.0 -netdev 
> tap,id=net0,ifname=tap0,script=no,downscript=no -device 
> e1000-82545em,netdev=net0,id=net0,mac=52:54:00:c9:18:27 -usb -device 
> usb-host,hostbus=3,hostaddr=3 -vga none
>
> Also, I was wondering, is it definitely impossible to reset a card 
> when using vfio-vga and seabios?
> ------------------------------------------------------------------------
> *From:* Nicolas Roy-Renaud <nicolas.roy-renaud.1 at ens.etsmtl.ca>
> *Sent:* 04 July 2016 07:18:12 PM
> *To:* Gerhard de Clercq
> *Cc:* vfio-users
> *Subject:* Re: [vfio-users] No reset on GT730
>
> Are you passing through any other PCI devices, like USB controllers or 
> soundcards? I'm guessing you've already checked your vm logs in 
> /var/log/libvirt/qemu and the daemon logs in journalctl?
>
>
> - Nicolas
>
>
> On 2016-07-03 12:33, Gerhard de Clercq wrote:
>>
>> I am trying to set up PCI passthrough of my Nvidia GT730 GPU on a 
>> fully up to date Fedora 24 system. I have managed to get it working 
>> but the problem is that it only works once after booting the host and 
>> to run again I need to reboot the host. I have determined that this 
>> is most likely caused by the fact that the GPU is not being reset. I 
>> bought this GPU because it has UEFI support after I could not get 
>> another one working with BIOS. It appeared as if though only AMD GPUs 
>> had a reset problem. Is this a known problem with this GPU and is 
>> there any way that I can try to force a reset?
>>
>>
>>
>> _______________________________________________
>> vfio-users mailing list
>> vfio-users at redhat.com
>> https://www.redhat.com/mailman/listinfo/vfio-users
>

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