lkml.org 
[lkml]   [2015]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 3.19-rc4: Xen pci-passthrough regression, bisected to commit cffe0a2b5a34c95a4dadc9ec7132690a5b0f6687 "x86, irq: Keep balance of IOAPIC pin reference count"
On 14/01/15 14:15, Sander Eikelenboom wrote:
> Hi Gerry / David / Konrad,
>
> Some more testing uncovered another issue under Xen, this time with PCI-passthrough.

What device? In particular what interrupts is it using?

> I have bisected it to the following commit:
> cffe0a2b5a34c95a4dadc9ec7132690a5b0f6687 "x86, irq: Keep balance of IOAPIC pin reference count"
>
> It causes these symptoms:
>
> - On Intel
> - Running on Xen with pci devices seized on host boot with xen-pciback.hide= parameter
> - Running a HVM guest with PCI passthrough of two devices (NIC + wireless NIC)
> - While the driver loads fine, the device isn't working properly, looking in /proc/interrupts in the guest
> shows that it doesn't receive any interrupts.
> - Reverting this particular commit (in the dom0 kernel only) makes the device receive interrupts and work properly again.
>
> - On AMD (more subtle symptom)
> - Running on Xen with pci devices seized on host boot with xen-pciback.hide= parameter
> - Running a HVM guest with PCI passthrough of one devices (videograbber)
> - While the driver loads fine and the device looks like it's working, the videostream isn't stable and it skips or repeats frames.
> - Reverting this particular commit (in the dom0 kernel only) makes the device work properly again with a stable videostream.
>
> --
> Sander
>



\
 
 \ /
  Last update: 2015-01-14 16:21    [W:0.049 / U:0.956 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site