Re: [Xen-devel] Xen-unstable: pci-passthrough "irq 16: nobody cared" on HVM guest shutdown on irq of device not passed through.

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.09.14 at 19:02, <linux@xxxxxxxxxxxxxx> wrote:
> lspci gives only one device with IRQ 16, the soundcontroller 
> 
> 00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia 
> (Intel HDA) (rev 40)
>         Subsystem: Micro-Star International Co., Ltd. Device 7640
>         Flags: bus master, slow devsel, latency 64, IRQ 16
>         Memory at fdbf8000 (64-bit, non-prefetchable) [size=16K]
>         Capabilities: [50] Power Management version 2
>         Kernel driver in use: snd_hda_intel
> 
> On boot i do get a message  "Already setup the GSI :16", however that seems 
> to happen for multiple devices and irq/gsi's.

And is quite normal.

> ##Cold boot of the host system
>     [   35.556728] xen: registering gsi 16 triggering 0 polarity 1
>     [   35.573157] xen: --> pirq=16 -> irq=16 (gsi=16)
>     (XEN) [2014-09-25 13:08:55.771] IOAPIC[0]: Set PCI routing entry (6-16 -> 
> 0x89 -> IRQ 16 Mode:1 Active:1)

So you managed to zap the one message presumably right before
this which would indicate which device this is done for (just like is
the case below).

>     [   38.575661] pciback 0000:09:00.0: enabling device (0000 -> 0003)
>     [   38.593584] xen: registering gsi 32 triggering 0 polarity 1
>     [   38.610461] xen: --> pirq=32 -> irq=32 (gsi=32)
>     (XEN) [2014-09-25 13:08:58.809] IOAPIC[1]: Set PCI routing entry (7-8 -> 
> 0xc9 -> IRQ 32 Mode:1 Active:1)
>     [   42.713230] xen: registering gsi 16 triggering 0 polarity 1
>     [   42.713233] Already setup the GSI :16

And again here. Context of all these messages is quite relevant.

Jan


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