linux-kernel - Re: 3.2.1 Unable to reset IRR messages on boot

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Message-ID: <20120320204859.GA25944@phenom.dumpdata.com>
Date:	Tue, 20 Mar 2012 16:48:59 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Josh Boyer <jwboyer@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, yinghai@...nel.org,
	linux-kernel@...r.kernel.org, kernel-team@...oraproject.org,
	midgoon@...il.com
Subject: Re: 3.2.1 Unable to reset IRR messages on boot

On Tue, Mar 20, 2012 at 01:41:32PM -0700, Suresh Siddha wrote:
> 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 can be up to sixteen and or up to whatever the INT_SRV_OVR has. With
the dummy mapping it was 0xff, which meant it had up to 255 which was more than
enough.
> 
> > 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
> 
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