Messages in this thread | | | Date | Wed, 14 Jan 2015 14:58:33 +0000 | From | David Vrabel <> | Subject | Re: 3.19-rc4: Xen pci-passthrough regression, bisected to commit cffe0a2b5a34c95a4dadc9ec7132690a5b0f6687 "x86, irq: Keep balance of IOAPIC pin reference count" |
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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 >
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