RE: [Xen-devel] Fail to passthru PCI device to HVM

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

To assign device to HVM guest, you should need an IOMMU-capable system like a 
VT-d capable machine.

What device is 01:00.0? Is it a special device like SR/IOV VF?

I guess you have to figure out why the device 01:00.0 is not discovered in 
scan_pci_devices().


Thanks,
-- Dexuan



-----Original Message-----
From: Jun Koi [mailto:junkoi2004@xxxxxxxxx] 
Sent: 2009?9?4? 15:00
To: Cui, Dexuan
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Fail to passthru PCI device to HVM

On Fri, Sep 4, 2009 at 3:55 PM, Cui, Dexuan<dexuan.cui@xxxxxxxxx> wrote:
> Are you sure "xm list" only shows Domain-0 and there is not any other domain?

Yes, I can confirm that.

> Looks it's really weird.
> Can you reboot the the host and re-try to create your hvm domain with 01:00.0 
> assigned?

That didnt help.

BTW: is that true that PCI passthru is only available with VT-d machine??

Thanks,
J



>
> -----Original Message-----
> From: Jun Koi [mailto:junkoi2004@xxxxxxxxx]
> Sent: 2009?9?4? 14:46
> To: Cui, Dexuan
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Fail to passthru PCI device to HVM
>
> On Fri, Sep 4, 2009 at 3:41 PM, Cui, Dexuan<dexuan.cui@xxxxxxxxx> wrote:
>> Looks the hypercall XEN_DOMCTL_test_assign_device returns a mistake somehow?
>>
>> Can you please have a look at xen/arch/x86/domctrl.c: arch_do_domctl() and 
>> find out in "case XEN_DOMCTL_test_assign_device" what the return value is?
>>
>> When you see the "Error: failed to assign device...", in "xm dmesg", did you 
>> notice a message like
>> "XEN_DOMCTL_test_assign_device:  ... already assigned, or non-existent"?
>
> A quick answer, yes. I have this in xm dmesg:
>
> "(XEN) domctl.c:672:d0 XEN_DOMCTL_test_assign_device: 1:0:0 already
> assigned, or non-existent"
>
> So what should I do to track this bug? Looking at
> xen/arch/x86/domctrl.c like you said above?
>
>
> Thanks,
> J
>
>
>
>
>> -----Original Message-----
>> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
>> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jun Koi
>> Sent: 2009?9?4? 14:09
>> To: xen-devel@xxxxxxxxxxxxxxxxxxx
>> Subject: [Xen-devel] Fail to passthru PCI device to HVM
>>
>> Hi,
>>
>> I am trying to passthru a PCI device to HVM. I think that I already
>> successfully unbind the device in Dom0, by verifying like below:
>>
>> #xm pci-list-assignable-devices
>> 0000:01:00.0
>>
>> Then I put a line like below into HVM config file:
>>
>> pci = ['0000:01:00.0']
>>
>> But creating the HVM failed, with below error:
>>
>> "Error: failed to assign device 01:00.0: maybe it has already been
>> assigned to other domain, or maybe it doesn't exist."
>>
>> The error message seems misleading, as there is no other VM is running
>> (only Dom0). So how can I fix this problem?
>>
>> (I am using -unstable, CS 20145:8fc927798476)
>>
>> Thanks,
>> J
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel
>>
>

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