From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: nr_irqs_gsi
Date: Mon, 23 Jul 2012 11:34:03 -0400
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To: Jan Beulich <JBeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>, Joe Jin <joe.jin@oracle.com>, xen-devel@lists.xen.org
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On Mon, Jul 23, 2012 at 02:30:37PM +0100, Jan Beulich wrote:
> >>> On 12.07.12 at 04:17, Joe Jin <joe.jin@oracle.com> wrote:
> >>>> (XEN) ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
> >>>> (XEN) IOAPIC[0]: apic_id 0, version 32, address 0xfec00000, GSI 0-23
> >>>> (XEN) ACPI: IOAPIC (id[0x01] address[0xfec80000] gsi_base[32])
> >>>> (XEN) IOAPIC[1]: apic_id 1, version 32, address 0xfec80000, GSI 32-55
> >
> > Below came from dom0:
> > 
> > ACPI: LAPIC_NMI (acpi_id[0xff] high edge lint[0x1])
> > ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
> > IOAPIC[0]: apic_id 0, version 255, address 0xfec00000, GSI 0-255
> 
> Now this and ...
> 
> > ACPI: IOAPIC (id[0x01] address[0xfec80000] gsi_base[32])
> > IOAPIC[1]: apic_id 1, version 255, address 0xfec80000, GSI 32-287
> 
> ... this is clearly bogus, contradicting what Xen itself prints (see
> above).

Yeah, that got fixed up in v3.5 (merge git f08b9c2f8af0d61faa1170aeae4fbca1eff6a504)
specifically:

      x86/apic: Fix UP boot crash
      xen/apic: implement io apic read with hypercall
      xen/x86: Implement x86_apic_ops
      x86/apic: Replace io_apic_ops with x86_io_apic_ops.
      x86/ioapic: Add io_apic_ops driver layer to allow interception

and the kernel Joe is using (UEK2) should have those back-ported.. Ah, he is
using the older version I think.