Re: [Xen-devel] [xen-unstable test] 11946: regressions - FAIL

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.05.12 at 20:29, AP <apxeng@xxxxxxxxx> wrote:
> On Mon, May 7, 2012 at 1:34 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>> Seeing the 'z' output might also be helpful, especially to see whether
>> any of the IO-APICs' RTEs is an ExtINT one.
> 
> (XEN) number of MP IRQ sources: 15.
> (XEN) number of IO-APIC #2 registers: 24.
> (XEN) testing the IO APIC.......................
> (XEN) IO APIC #2......
> (XEN) .... register #00: 02000000
> (XEN) .......    : physical APIC id: 02
> (XEN) .......    : Delivery Type: 0
> (XEN) .......    : LTS          : 0
> (XEN) .... register #01: 00170020
> (XEN) .......     : max redirection entries: 0017
> (XEN) .......     : PRQ implemented: 0
> (XEN) .......     : IO APIC version: 0020
> (XEN) .... IRQ redirection table:
> (XEN)  NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
> (XEN)  00 000 00  1    0    0   0   0    0    0    00
> (XEN)  01 000 00  0    0    0   0   0    1    1    85
> (XEN)  02 000 00  0    0    0   0   0    1    1    F0
> (XEN)  03 000 00  0    0    0   0   0    1    1    40
> (XEN)  04 000 00  0    0    0   0   0    1    1    48
> (XEN)  05 000 00  0    0    0   0   0    1    1    50
> (XEN)  06 000 00  0    0    0   0   0    1    1    58
> (XEN)  07 000 00  0    0    0   0   0    1    1    60
> (XEN)  08 000 00  0    0    0   0   0    1    1    29
> (XEN)  09 000 00  0    1    0   0   0    1    1    A7
> (XEN)  0a 000 00  0    0    0   0   0    1    1    78
> (XEN)  0b 000 00  0    0    0   0   0    1    1    88
> (XEN)  0c 000 00  0    0    0   0   0    1    1    D4
> (XEN)  0d 000 00  1    0    0   0   0    1    1    98
> (XEN)  0e 000 00  0    0    0   0   0    1    1    A0
> (XEN)  0f 000 00  0    0    0   0   0    1    1    A8
> (XEN)  10 000 00  0    1    0   1   0    1    1    AE
> (XEN)  11 000 00  1    1    0   1   0    1    1    C0
> (XEN)  12 000 00  1    1    0   1   0    1    1    C8
> (XEN)  13 000 00  0    1    0   1   0    1    1    F1
> (XEN)  14 000 00  1    1    0   1   0    1    1    61
> (XEN)  15 0CA 0A  1    0    0   0   0    1    2    71

This entry is definitely bogus (delivery mode is SMI, which is not
allowed in an IO-APIC RTE), but as it is masked it _shouldn't_
cause any harm.

> (XEN)  16 000 00  1    1    0   1   0    1    1    32
> (XEN)  17 000 00  0    1    0   1   0    1    1    AC

So we'll need to see the PIC (8259A) masks too. IRQ12 definitely
appears to get touched a lot (judging by the vector it uses), so while
this shouldn't be the case I would nevertheless consider the possibility
of a window where the 8259A interrupt gets temporarily unmasked.

Jan


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