Re: [Xen-users] VT-Support error

[Daniel Kao <dkao@xxxxxxxxxxxx>]

 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
> > > >
> > > > _______________________________________________
> > > > Xen-users mailing list
> > > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > > http://lists.xensource.com/xen-users
> > > 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
> > >
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-users
> 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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