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 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
