From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joe Jin <joe.jin@oracle.com>
Subject: Re: nr_irqs_gsi
Date: Thu, 12 Jul 2012 07:56:45 +0800
Message-ID: <4FFE12BD.2000205@oracle.com>
References: <4FFCF3AE.1050200@oracle.com> <4FFD4A72.9090500@citrix.com>
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To: xen-devel@lists.xen.org, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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On 07/11/12 17:42, Andrew Cooper wrote:
> 
> No.  There are 55 GSIs, indexed 0 thru 54.  You would be introducing an
> off-by-one error by changing the condition.

Per xen log, I think it should be 0-55? for it start from 0 yet, please confirm!

>> (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

> 
> The more interesting question is why you are attempting to map more GSIs
> than you actually have.
> 

The request came from Dom0 kernel(upstream kernel 3.0.x) for physical device. 

Thanks,
Joe