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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