Re: [Xen-users] VT-Support error

[Trolle Selander <trolle.selander@xxxxxxxxx>]

IOMMU is a chipset feature, not a CPU feature. For AMD CPUs, you need a motherboard with the 890FX chipset to get IOMMU functionality - it's the only current consumer-grade chipset that supports it on the AMD side. On the intel side, you also need to really do your research to make sure you get a motherboard with a chipset that supports VT-d - far from all Intel chipsets do.

-- Trolle

On Mon, Jul 12, 2010 at 7:48 PM, Daniel Kao <dkao@xxxxxxxxxxxx> wrote:

 On 7/12/2010 4:44 PM, Net Warrior wrote:

On 07/12/10 19:49, chris wrote:

if its a athlon II, then there is no vt-d. vt-d is a intel iommu

On Mon, Jul 12, 2010 at 2:47 PM, Net Warrior<netwarrior863@xxxxxxxxx>  wrote:

On 07/12/10 15:00, Daniel Kao wrote:

 On 7/12/2010 10:54 AM, Net Warrior wrote:

Hi there..
I've got the folowing error while trying to assign the video card from
Dom0 to DomU

Using config file "/etc/xen/winkk".
Error: failed to assign device: maybe the platform doesn't support VT-d,
or VT-d isn't enabled properly?

What Am I missing? obviously I've got VT support enable, cuz I was able
to create the Windows DomU.

Config file
pci=[ '01:05.0' ]

lspci
01:05.0 VGA compatible controller: ATI Technologies Inc Device 9710

grub config

module /boot/vmlinuz-2.6.31.13 ro root=/dev/sda1
xen-pciback.hide=(01:05.0)

Anyway xm pci-list-assignable-devices show nothing, what's wrong?


Thanks is advance
Regards

VT-d support (PCI passthrough) is a subset of VT-x support.  Not all
chipsets support VT-d nor is it required for full-virtualization of
guests. (i.e. Windows)

Cheers,
Daniel

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I do not understad, what does it mean? that I shoud not be getting that
error and should be able to pass-throught the decive to my DomU?
Reading this -  http://wiki.xensource.com/xenwiki/VTdHowTo, also added
iommy=1 to grub, but no luck, still do not get
why xm pci-list-assignable-devices show nothing, at least should show
01:05.0, in xen pci backend mode also used Virtual PCI just to test,
same behavior.


I'm using
2.6.31.13 #7 SMP Mon Jul 12 15:33:25 ART 2010 x86_64 AMD Athlon(tm) II
X4 630 Processor AuthenticAMD GNU/Linux

All xen options compiled embeded, not modules/initramfs used.

Regards


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Well, it seems there is no luck!! eventhough I thought this CPU was the
right for me, I made a bad move, or at least the svm
that this CPU supports it's not enough.

So, as for your comment, it seems the vt-d it's an intel feature only?
no way to export pci devices to DomU's using AMD?


Thanks for yor time and support..


vendor_id    : AuthenticAMD
cpu family    : 16
model        : 5
model name    : AMD Athlon(tm) II X4 630 Processor
stepping    : 2
cpu MHz        : 181187.590
cache size    : 512 KB
fpu        : yes
fpu_exception    : yes
cpuid level    : 5
wp        : yes
flags        : fpu de tsc msr pae mce cx8 apic mtrr mca cmov clflush mmx
fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow
constant_tsc rep_good nonstop_tsc extd_apicid pni cx16 popcnt hypervisor
lahf_lm cmp_legacy extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch
bogomips    : 5624.81
TLB size    : 1024 4K pages
clflush size    : 64
cache_alignment    : 64
address sizes    : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate

If I recall, some people have had luck with AMD SVM.  However, it's heavily dependent on which motherboard/chipset you have and if it's enabled.  I'd have to search through the Xen list archives, but I remember seeing some successes with AMD SVM for PCI passthrough. -- If you've got the right hardware, Xen will support it.

It's just that Intel VT-d is more heavily used/documented as working.

Cheers,
Daniel

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