[Qemu-devel] [Bug 1680679] Re: qemu cannot run twice

[Alex Williamson]

If you get one boot where GPU assignment works with a mobile GeForce,
you're doing better than most.

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https://bugs.launchpad.net/bugs/1680679

Title:
  qemu cannot run twice

Status in QEMU:
  New

Bug description:
  After using qemu with gpu passthrough and then shutting down windows 7 
properly I cannot boot windows 7 a second time.
  Only a full reboot of linux fixes this issue.
  Qemu appears to corrupt something in linux when exiting.
  I get no error messages but windows 7 never finishes booting during the 2nd 
try.
  Apparently I do try to run vfiobind each time the script is run.
  Wondering if rerunning vfiobind can cause an issue?

  
  My specs:
  
-----------------------------------------------------------------------------------------
  System:    Host: GT70-2PE Kernel: 4.5.4-040504-generic x86_64 (64 bit gcc: 
5.3.1)
             Desktop: Cinnamon 3.2.7 (Gtk 3.18.9) Distro: Linux Mint 18.1 Serena
  Machine:   Mobo: Micro-Star model: MS-1763 v: REV:0.C Bios: American 
Megatrends v: E1763IMS.51B date: 01/29/2015
  CPU:       Quad core Intel Core i7-4810MQ (-HT-MCP-) cache: 6144 KB
             flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 22347
             clock speeds: max: 2801 MHz 1: 2801 MHz 2: 2801 MHz 3: 2801 MHz 4: 
2801 MHz 5: 2801 MHz 6: 2801 MHz
             7: 2801 MHz 8: 2801 MHz
  Graphics:  Card-1: Intel 4th Gen Core Processor Integrated Graphics 
Controller bus-ID: 00:02.0
             Card-2: NVIDIA GK104M [GeForce GTX 880M] bus-ID: 01:00.0
             Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa)
             Resolution: address@hidden, address@hidden
             GLX Renderer: Mesa DRI Intel Haswell Mobile GLX Version: 3.0 Mesa 
12.0.6 Direct Rendering: Yes

  
  My script:
  
-------------------------------------------------------------------------------------------
  #!/bin/bash

  cd ~/qemu
  sudo ./up.sh tap0

  configfile=~/qemu/vfio-pci1.cfg

  vfiobind() {
      dev="$1"
          vendor=$(cat /sys/bus/pci/devices/$dev/vendor)
          device=$(cat /sys/bus/pci/devices/$dev/device)
          if [ -e /sys/bus/pci/devices/$dev/driver ]; then
                  echo $dev > /sys/bus/pci/devices/$dev/driver/unbind
          fi
          echo $vendor $device > /sys/bus/pci/drivers/vfio-pci/new_id

  }

  modprobe vfio-pci

  cat $configfile | while read line;do
      echo $line | grep ^# >/dev/null 2>&1 && continue
          vfiobind $line
  done

  sudo qemu-system-x86_64 -machine type=q35,accel=kvm -cpu host,kvm=off \
  -smp 8,sockets=1,cores=4,threads=2 \
  -bios /usr/share/seabios/bios.bin \
  -serial none \
  -parallel none \
  -vga none \
  -m 4G \
  -mem-path /run/hugepages/kvm \
  -mem-prealloc \
  -balloon none \
  -rtc clock=host,base=localtime \
  -device 
ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1 \
  -device vfio-pci,host=01:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on \
  -device virtio-scsi-pci,id=scsi \
  -drive 
id=disk0,if=virtio,cache=none,format=raw,file=/home/dad/qemu/windows7.img \
  -drive 
file=/home/dad/1TB-Backup/Iso/SP1ForWin7.iso,id=isocd,format=raw,if=none 
-device scsi-cd,drive=isocd \
  -net nic -net tap,ifname=tap0,script=no,downscript=no \
  -usbdevice host:413c:a503 \
  -usbdevice host:13fe:3100 \
  -usbdevice host:0bc2:ab21 \
  -boot menu=on \
  -boot order=c

  sudo ./down.sh tap0

  exit 0

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