Re: [Xen-users] VGA PASSTHROUGH not working :(

[Carl Schneider <carl.schneider+mailinglists@xxxxxx>]

On 05/27/2016 11:17 AM, Jason Long wrote:
> My Dom0 is Fedora 23 Server and my "/etc/default/grub" is :
> 
> GRUB_TIMEOUT=5
> GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
> GRUB_DEFAULT=saved
> GRUB_DISABLE_SUBMENU=true
> GRUB_TERMINAL_OUTPUT="console"
> GRUB_CMDLINE_LINUX="rd.lvm.lv=fedora/root00 rd.lvm.lv=fedora/swap rhgb
> quiet xen-pciback.hide=(01:00.0)"
> GRUB_DISABLE_RECOVERY="true"
> 
> and I added below lines to my Windows vm config file :
> 
> acpi=1
> pci=['01:00.0']
> 
> But
> 
> [root@localhost ~]# xl create /etc/xen/windows.cfg
> Parsing config from /etc/xen/windows.cfg
> libxl: error: libxl_pci.c:1089:libxl__device_pci_add: PCI device
> 0000:01:00.0 cannot be assigned - no IOMMU?
> libxl: error: libxl_create.c:1405:domcreate_attach_pci:
> libxl_device_pci_add failed: -1
> libxl: info: libxl.c:1698:devices_destroy_cb: forked pid 2282 for
> destroy of domain 1
> 
> As you see, I got error.
> 
> # lspci
> 01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce
> 210] (rev a2)


Hi, sorry that I was not able to answer earlier.

You said that your CPU is the i7 2600K and posted this link to the Ark:
http://ark.intel.com/products/52214/Intel-Core-i7-2600K-Processor-8M-Cache-up-to-3_80-GHz

It clearly states that it has no VT-d, thus you are not able to activate
the IOMMU because there is no IOMMU. Your steps were all more or less
the correct way to activate it, but your hardware does sadly not support
ist.

The point is that Intel normally deactivates VT-d for the -k-versions.
If you compare it to the i7-2600
(http://ark.intel.com/de/products/52213/Intel-Core-i7-2600-Processor-8M-Cache-up-to-3_80-GHz),
you see that this CPU would support it.

Please note that your Chipset/Motherboard/BIOS needs to support
VT-d/IOMMU, too.


Cheers
CRT

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