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Re: [Xen-devel] Re: vt-d p7p55d evo: Success

I had no problems passing through my Nvidia 8800gts 512. The nv driver on linux works fine (as good as it can). There were a few quirks to note, but I imagine your experience will vary using ATI.

- It takes a bit before you see VGA output
- The cursor was positioned a higher than normal (sitting at over the halfway mark for the font)
- Shutdown of Xorg can leave you with a blank console
- Shutdown then Restart of domU without restarting dom0 may lead to no VGA output, however you can still ssh in and startx (Xorg) and it will produce output

This is my specific dom0 grub2 entry for VGA passthrough

menuentry "Xen 4.0.0-rc8 / Ubuntu 10.4 kernel pvops IOMMU SERIAL" {
insmod ext2
search --no-floppy --fs-uuid --set 321dedfa-be48-4b4d-bff0-0e5ecce240fd
multiboot /boot/xen-4.0.0-rc8.gz dummy=dummy iommu=1 dom0_mem=1024M com1=19200,8n1,0xe480,17 console=com1 module /boot/vmlinuz- dummy=dummy root=/dev/sdc2 ro xen-pciback.permissive xen-pciback.hide=(01:00.0)(00:1a.0)(00:1d.0) console=hvc0
module /boot/initrd.img-

A couple of those addresses are the usb controllers so I make use of mouse and keyboard. I never could get qemu passthrough to work. Epic fail on trying to use the nvidia drivers =) The new version tells you specifically that it does not support the card @ PCI xxxx

All I needed in the hvm config was:


I can't think of anything else right now :)

Mark Hurenkamp wrote:
Next on my list: try passthrough of the primary graphics card...


On Apr 9, 2010, at 1:57 AM, Mark Hurenkamp wrote:


I replaced the i5 with an i7 CPU, and now xen seems to enable vtd properly,
i have yet  to test the feature with my board, but xm info now shows the
hvm_directio flag:
host                   : coruscant
release                :
version                : #10 SMP PREEMPT Wed Apr 7 23:57:39 CEST 2010
machine                : x86_64
nr_cpus                : 8
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 2
cpu_mhz                : 3660
hw_caps                :
virt_caps              : hvm hvm_directio
total_memory           : 7975
free_memory            : 2425
node_to_cpu            : node0:0-7
node_to_memory         : node0:2425
node_to_dma32_mem      : node0:1310
max_node_id            : 0
xen_major              : 4
xen_minor              : 0
xen_extra              : .0
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset : Wed Apr 07 12:38:28 2010 +0100 21091:f28f1ee587c8
xen_commandline        : console_to_ring com1=115200,8n1 console=com1
cc_compiler            : gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu9)
cc_compile_by          : root
cc_compile_domain      : karpeer.net
cc_compile_date        : Wed Apr  7 23:16:01 CEST 2010
xend_config_format     : 4


On Monday 05 April 2010 11:24:36 pm Sander Eikelenboom wrote:
Hi Mark,

I guess that's your problem, your cpu doesn't seem to support VT-D, see

Both CPU, chipset and bios most support it ...


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