Messages in this thread | | | Date | Wed, 14 Jan 2015 15:15:21 +0100 | From | Sander Eikelenboom <> | Subject | 3.19-rc4: Xen pci-passthrough regression, bisected to commit cffe0a2b5a34c95a4dadc9ec7132690a5b0f6687 "x86, irq: Keep balance of IOAPIC pin reference count" |
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Hi Gerry / David / Konrad,
Some more testing uncovered another issue under Xen, this time with PCI-passthrough.
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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