Wednesday, October 13, 2010, 5:26:27 PM, you wrote:
>>>> On 13.10.10 at 17:03, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:
>> Err yes i'm nor a kernel nor a xen hacker so i'm just trying not to speak
>> complete gibberish :-)
>> Well since the device when seized by pciback on boot, seems to be assigned
>> to dom0 and therefore d=0, the
>> for_each_domain(d)
>> if ( !paging_mode_translate(d) &&
>> (iomem_access_permitted(d, dev->msix_table.first,
>> dev->msix_table.last) ||
>> iomem_access_permitted(d, dev->msix_pba.first,
>> dev->msix_pba.last)) )
>> break;
>>
>> part seems never to be run, because a device seems to allways be assigned to
>> a domain.
> That code fragment sits inside a if (!d), i.e. if we can easily tell
> (by just looking at dev->domain) which domain owns the device.
>> So if it seems to be never run ... why is it there ?
> You're probably more after the subsequent if (d) with the comment
> somewhat confusing you in its body - again, the function gets
> executed (or is supposed to) when a domain enables MSI-X on the
> device. At that point, dev->domain should be non-NULL (and
> different from dom0), so the body (if there really was one) would
> get executed.
Thx for you patience .. just one more time ...
I saw a mistake in my explanation, i didn't mean d=0, but in my case (fresh
boot, first time domain with passthrough is started) d is not NULL and
d->domain_id = 0
So it seems it thinks it's still assigned to dom0 when the MSI-X gets enabled ?
But this all does get triggered when the domU is started to which the domain is
passed through, and yes it enables MSI-X (when i look at lspci or
/proc/interrupts in the domU)
but d->domain_id results in "0" and not in the domain id of domU.
So if in this case the code in ( !d ) should have been run, it didn't (have put
a printk there to be sure)
You were right that it didn't fix my freeze problem, although the RCU detected
CPU stall was now followed by the beginning of a trace although it doesn't
provide much more info.
I attached a photo of it.
--
Sander
> Jan
--
Best regards,
Sander mailto:linux@xxxxxxxxxxxxxx
SAM_0480.JPG
Description: JPEG image
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