Vga passtrough with only one monitor,is possible?


 
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Operating Systems Linux Vga passtrough with only one monitor,is possible?
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Old 11-21-2016
Vga passtrough with only one monitor,is possible?

I have one monitor,two vga cards,one is nvidia(host)
the other ati rs450(guest),I use this script for use a vm
windows with a native gpu(the ati rs450)
I see this video and seems to be possible using only one
monitor,but I don't understand how to do

The video
QEMU VGA passthrough without a real monitor attached - YouTube

My script
Code:
qemu-system-x86_64 -enable-kvm -m 6192 -cpu host,kvm=off \
-device vfio-pci,host=06:00.0,multifunction=on,x-vga=on \
-device vfio-pci,host=06:00.1 \
-net nic,model=e1000 -net tap,ifname=tap0,script=no \
-drive file=.local/libvirt/images/win7.qcow2,format=qcow2 \
-cdrom 1.iso \
-vga qxl -sdl -boot c

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ATI(4)							     Kernel Interfaces Manual							    ATI(4)

NAME
ati - ATI video driver SYNOPSIS
Section "Device" Identifier "devname" Driver "ati" ... EndSection DESCRIPTION
ati is an Xorg wrapper driver for ATI video cards. It autodetects whether your hardware has a Radeon, Rage 128, or Mach64 or earlier class of chipset, and loads the radeon(4), r128(4), or mach64 driver as appropriate. SUPPORTED HARDWARE
The ati driver supports Radeon, Rage 128, and Mach64 and earlier chipsets by loading those drivers. See those manpages for specific cards supported. CONFIGURATION DETAILS
Please refer to xorg.conf(5) for general configuration details, and the specific card driver for driver configuration details. SEE ALSO
Xorg(1), xorg.conf(5), Xserver(1), X(7), r128(4), radeon(4) AUTHORS
See the individual driver pages for authors. X Version 11 xf86-video-ati 6.14.99 ATI(4)