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Subject: Re: 3.2.1 Unable to reset IRR messages on boot
From: Suresh Siddha <suresh.b.siddha@intel.com>
Reply-To: Suresh Siddha <suresh.b.siddha@intel.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Josh Boyer <jwboyer@redhat.com>, Ingo Molnar <mingo@elte.hu>,
        "H. Peter Anvin" <hpa@zytor.com>, yinghai@kernel.org,
        linux-kernel@vger.kernel.org, kernel-team@fedoraproject.org,
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Date: Tue, 20 Mar 2012 13:41:32 -0700
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On Tue, 2012-03-20 at 16:25 -0400, Konrad Rzeszutek Wilk wrote:
> On Tue, Mar 20, 2012 at 01:05:19PM -0700, Suresh Siddha wrote:
> > Also does the dom0 see all the GSI's/io-apic's that the host sees or is
> > it going to be just one io-apic? I was just wondering if the reg 01 need
> > to be same as what the host sees?
> 
> It does not use the APIC mechanism at all. It only needs the GSI value
> from the IOAPIC and LAPIC so that the ACPI can work.

So the number of redirection entries in the io-apic need to be same as
the original values then?

> It could also at startup copy the original values and stick them in these copies.
> That does mean using the memory allocator to allocate X copies for X IOAPICS. I
> don't think the memory allocator is active at that stage since we using fixmaps.
> Thoughts?

You should be able to use alloc_bootmem friends.

thanks,
suresh