Re: libxl: error: libxl_pci.c:1477:libxl__device_pci_reset: The kernel doesn't support reset from sysfs for PCI device 0000:01:00.1

[Sarah Newman <srn@xxxxxxxxx>]

On 7/25/20 5:52 AM, Mario Marietto wrote:
> Hello
>
> So,please come back to the passthrough of my graphic card with xen,that it
> does not work. Please note that I'm not trying to use my existing windows
> 10 installation anymore. Instead I have installed windows 10 from the
> official microsoft iso image. The cfg file that I'm using is like this :
>
> builder='hvm'
> memory = 8124
> name = 'win10'
> vcpus=6
> pae=1
> acpi=1
> apic=1
> vif = [ 'mac=00:16:3e:68:e1:01,type=vif,bridge=xenbr0' ]
> disk = [ 'phy:/dev/guest/win10,hda,w' ,
> 'file:/media/install/Win10x64.iso,hdb:cdrom,r' ]
> #device_model_version = 'qemu-xen-traditional'
> boot='dc'
> #boot='c'
> sdl=1
> vnc=1
> serial='pty'
> tsc_mode="default"
> viridian=1
> usb=1
> usbdevice='tablet'
> gfx_passthru=0
>
> pci=[ '01:00.0', '01:00.1' , '01:00.2' , '01:00.3' ]
> localtime=1
> xen_platform_pci=1
> pci_power_mgmt=1
> stdvga = 0
> serial = 'pty'
> on_poweroff = 'destroy'
> on_reboot   = 'destroy'
> on_crash    = 'destroy'
>
> device_model_args_hvm = [
>    # Debug OVMF
>    '-chardev', 'file,id=debugcon,path=/etc/xen/win10.log,',
>    '-device', 'isa-debugcon,iobase=0x402,chardev=debugcon',
> ]
>
> Before to create the guest,I run this script :
>
> if [ $# -eq 0 ]; then
>      echo "Require PCI devices in format:  <domain>:<bus>:<slot>.<function>"
>      echo "Eg: $(basename $0) 0000:00:1b.0"
>      exit 1
> fi
>
> modprobe xen-pciback
>
> for pcidev in $@; do
>      if [ -h /sys/bus/pci/devices/"$pcidev"/driver ]; then
>          echo "Unbinding $pcidev from" $(basename $(readlink
> /sys/bus/pci/devices/"$pcidev"/driver))
>          echo -n "$pcidev" > /sys/bus/pci/devices/"$pcidev"/driver/unbind
>      fi
>      echo "Binding $pcidev to pciback"
>      echo -n "$pcidev" > /sys/bus/pci/drivers/pciback/new_slot
>      echo -n "$pcidev" > /sys/bus/pci/drivers/pciback/bind
> done
>
> for 4 times,like this :
>
> root@ziomario-I9:/etc/xen# ./pciback-0000:01:00.0.sh 0000:01:00.0
> Unbinding 0000:01:00.0 from nvidia
> Binding 0000:01:00.0 to pciback
>
> root@ziomario-I9:/etc/xen# ./pciback-0000:01:00.0.sh 0000:01:00.1
> Unbinding 0000:01:00.1 from snd_hda_intel
> Binding 0000:01:00.1 to pciback
>
> root@ziomario-I9:/etc/xen# ./pciback-0000:01:00.0.sh 0000:01:00.2
> Unbinding 0000:01:00.2 from xhci_hcd
> Binding 0000:01:00.2 to pciback
>
> root@ziomario-I9:/etc/xen# ./pciback-0000:01:00.0.sh 0000:01:00.3
> Unbinding 0000:01:00.3 from nvidia-gpu
> Binding 0000:01:00.3 to pciback
>
> it seems good,but It is not,infact this is what happens when I create the
> guest :
>
> libxl: error: libxl_pci.c:1477:libxl__device_pci_reset: The kernel doesn't
> support reset from sysfs for PCI device 0000:01:00.1
> libxl: error: libxl_pci.c:1477:libxl__device_pci_reset: The kernel doesn't
> support reset from sysfs for PCI device 0000:01:00.2
> libxl: error: libxl_pci.c:1477:libxl__device_pci_reset: The kernel doesn't
> support reset from sysfs for PCI device 0000:01:00.3
>
>
> I tried to pass only the first line,like this :
>
>
> pci=[ '01:00.0' ]
>
>
> the guest starts,but :
>
>
>      1) the resolution is black and white,640x480 and I can't increase it
You didn't include the xen version. That's critical information.

I'm seeing this problem with qemu 5.0.0, did you ever figure it out?

Thanks, Sarah