From: Max Schettler <max.schettler@googlemail.com>
To: kvm@vger.kernel.org
Subject: Vga passthrough to KVM Guest issues
Date: Wed, 16 Oct 2013 21:08:30 +0200 [thread overview]
Message-ID: <1381950510.1205.10.camel@max-pc.lan> (raw)
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Hi guys,
Im trying to set up vga passthrough. I use the latest mainline kernel
(3.12rc5) and patched qemu (1.6.50). When i try to start a VM using this
command:
qemu-system-x86_64 -enable-kvm -M q35 -m 1024 -cpu qemu64
-bios /usr/share/qemu/bios.bin -vga none
-device
ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1
-device vfio-pci,host=06:00.0,bus=root.1,multifunction=on,x-vga=on
-device vfio-pci,host=06:00.1,bus=root.1
The screen attached to the passthroughed GPU turns on but does not show
any output.
Also I get some warnings from amd_iommu and my kernel messages are full
of AMD-Vi messages:
"AMD-Vi: Completion-Wait loop timed out" and
"AMD-Vi: Event logged [IOTLB_INV_TIMEOUT device=06:00.0
address=0x0000000438544b90"
If i dont stop the qemu process this eventually forces me to reboot
since the host gets unusable.
I uploaded the whole dmesg output, if its of any help here:
http://pastebin.com/ki13dqEd
My hardware is an AMD FX-8350 with an Gigabyte 970A-UD3 and a Gigabyte
7870OC.
Any help is much appreciated, thanks in advance!
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next reply other threads:[~2013-10-16 19:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-16 19:08 Max Schettler [this message]
2013-10-28 16:17 ` Vga passthrough to KVM Guest issues Alex Williamson
2013-11-01 15:09 ` Joerg Roedel
2013-11-01 16:35 ` Max Schettler
2013-11-01 16:45 ` Joerg Roedel
2013-11-01 16:54 ` Max Schettler
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