Re: [Xen-users] Cannot make VGA Passthrough with Xen 4.4.1

[Peter Milesson <miles@xxxxxxxx>]

On 2016-09-19 20:05, Manuel R. Campos wrote:

Hello to everybody,

I have in my system this Xen version, I decided to use the one from repos. Right now I'm using a Debian 8 (Kernel 4.1.21) with an i7-4700EQ (I can use Vt-d and is enabled by dmesg) with 16 GB of RAM. I installed Xen with the Terminal using apt-get install xen-linux-system-amd64 xen-tools. I made the change in the grub for the RAM, dom0 has 1GB and 1 vcpu. No autoballoon and the file xendomains is also changed. After the restart I have the dom0 without problems. I wanna make a VGA PT but I don't find a good tutorial over the Internet and in this system is not possible to use the qemu-xen-traditional. I put here the configuration of the VM:

builder = "hvm"

name = "viewer"

viridian = 1

memory = 4096

vcpus = 4

disk =['file:/home/manu/imageRecorder/xenwinview7.img, hda, w']

device_model_version = 'qemu-xen'

pci = ['0a:00.0']

pci_permissive = 1

monitor = 1

pci_power_mgmt = 1

xen_platform_pci = 1

pci_msitranslate = 1

viridian = 1

hpet = 1

acpi = 1

apic = 1

pae = 1

nx = 1

localtime = 1

usbdevice = "tablet"

vnc = 1

vncdisplay = 4

vncunused = 0

vnclisten = "0.0.0.0"

_on_poweroff_ = 'destroy'

_on_reboot_ = 'restart'

_on_crash_ = 'restart'

boot = 'd'

Until here, I have a couple of problems. The VM runs good but the PCI PT had to be with a script. First I enable the xen-pciback and then I make assignable the Ethernet ports, then I attach them to the VM. It is not the best solution but it works. And then I'd like to make the VGA PT but following the tutorial from Xen, I don't know how should be the option "XEN_PCIDEV_BACKEND" in my config file from the boot, because now is a 'm'. So, when I make (I know this is not good, for that I'm here) a "xl pci-assignable-add 00:02.0". Here sometimes I get a reboot, sometimes doesn't. And if that works, and I type "xl pci-attach viewer 00:02.0" I cannot bind it for some reason.

Can anybody help me?

Thanks in advance.

--

Un saludo. Best regards. Viele Grüße. 

Manuel R. Campos Roldán

Hi Manuel,

Have you got a working IOMMU? If not, forget it.

Here are two pages with information about hardware.

https://wiki.xen.org/wiki/VTd_HowTo
https://en.wikipedia.org/wiki/List_of_IOMMU-supporting_hardware

Not exhaustive, but it may help.

Run the command xl dmesg|grep IOMMU

If the result is something like:

(XEN) AMD-Vi: IOMMU 0 Enabled.

then you can go on. On the other hand if it reports:

(XEN) AMD-Vi: IOMMU not found!

then get yourself hardware that fulfills the requirements.

Best regards,

Peter

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