Cannot bind IRQ 2 to guest. In use by 'cascade'.

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Cannot bind IRQ 2 to guest. In use by 'cascade'.

Nicholas Lee
 Xen version 3.0-devel (nic@localdomain) (gcc version 3.3.5 (Debian
1:3.3.5-13)) Fri Oct 14 10:41:30 NZDT 2005
 Latest ChangeSet: Fri Oct 14 03:26:44 2005 +0100 7369:92c6021f23e4
[....]
(XEN) Scrubbing Free RAM: .........................................done.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
input to Xen).
(XEN) (file=irq.c, line=224) Cannot bind IRQ 2 to guest. In use by 'cascade'.
[repeats 14 more times]

What exactly is this for?

There doesn't seem to be a IRQ 2 in /proc/interrupts
nic@wuwei:~$ cat /proc/interrupts
           CPU0
  1:          8        Phys-irq  i8042
  8:          0        Phys-irq  rtc
  9:          0        Phys-irq  acpi
 12:        102        Phys-irq  i8042
 15:         12        Phys-irq  ide1
 19:       2448        Phys-irq  ohci_hcd:usb1, ohci_hcd:usb2
 25:        209        Phys-irq  peth0
 27:       1922        Phys-irq  ioc0
256:       6899     Dynamic-irq  timer0
257:          0     Dynamic-irq  console
258:          0     Dynamic-irq  net-be-dbg
259:         66     Dynamic-irq  xenbus
NMI:          0
LOC:          0
ERR:          0



--
Nicholas Lee
http://stateless.geek.nz
gpg 8072 4F86 EDCD 4FC1 18EF  5BDD 07B0 9597 6D58 D70C

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Re: Cannot bind IRQ 2 to guest. In use by 'cascade'.

Keir Fraser

On 13 Oct 2005, at 22:51, Nicholas Lee wrote:

> (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
> input to Xen).
> (XEN) (file=irq.c, line=224) Cannot bind IRQ 2 to guest. In use by
> 'cascade'.
> [repeats 14 more times]
>
> What exactly is this for?

Xen manages the PIC and manages the cascade line (irq2) itself. Hence
no guests can bind to it. That message usually comes out when domain0
is probing for an irq by trying to bind to every irq in the system.

  -- Keir


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