On 6/29/17 00:26, Steven Walter wrote:
So, I'm trying to reproduce this issue on the Ryzen system w/ the following
setup:
* Host kernel v4.11 (with this patch https://lkml.org/lkml/2017/6/23/295)
* guest VM RHEL7.3
* guest graphic driver = radeon
* qemu-system-x86_64 --version
QEMU emulator version 2.9.50 (v2.9.0-1659-g577caa2-dirty)
* kvm-amd npt=1
* dGPU is 08:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
[AMD/ATI] Tobago PRO [Radeon R7 360 / R9 360 OEM] (rev 81)
* qemu-system-x86_64 -smp 4 -enable-kvm -M q35 -m 4096 -cpu host -bios
/usr/share/qemu/bios.bin -device
ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1
-drive file=/sandbox/vm-images/rhel7.3.qcow2,if=virtio,id=disk0 -net none
-vga none -nodefaults -device
vfio-pci,host=08:00.0,x-vga=on,addr=0.0,multifunction=on,bus=root.1,romfile=/sandbox/vm-images/vbios.rom
-usb -device usb-host,hostbus=3,hostport=1 -device
usb-host,hostbus=3,hostport=3 -device vfio-pci,host=0000:08:00.1 -device
vfio-pci,host=0000:09:00.0
With this setup, I am able to pass-through the dGPU and run the following
test:
* Starting up the guest w/ full GNOME GUI on the attached monitor.
* glxgears (running @ 60 FPS)
* Playing 1080p HD video on Youtube
I am not noticing issues here. What kind of test are you running in the
guest VM?
Try running the open source game "torcs" inside the VM. I think
you'll find that there's a very noticeable performance different
between npt=1 and npt=0
Hm.. actually torcs seems to be running fine w/ npt=1 setup. Although I think my
driving skill is ~20% worse :(
S
