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RE: [Xen-devel] Fail to passthru PCI device to HVM
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
From: Jun Koi [mailto:junkoi2004@xxxxxxxxx]
Sent: 2009?9?4? 15:00
To: Cui, Dexuan
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
That didnt help.
BTW: is that true that PCI passthru is only available with VT-d machine??
> -----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?
>> -----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
>> 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
>> 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)
>> Xen-devel mailing list
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