linux-kernel - Re: [PATCH] x86: let 32bit use apic_ops too

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Message-Id: <1216148658.6620.192.camel@bodhitayantram.eng.vmware.com>
Date:	Tue, 15 Jul 2008 12:04:18 -0700
From:	Zachary Amsden <zach@...are.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"yhlu.kernel@...il.com" <yhlu.kernel@...il.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization <virtualization@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: let 32bit use apic_ops too - fix

On Tue, 2008-07-15 at 11:51 -0700, Suresh Siddha wrote:
> On Tue, Jul 15, 2008 at 11:38:50AM -0700, Zachary Amsden wrote:
> >
> > Nacked-by: Zachary Amsden <zach@...are.com>
> >
> > What are you doing here and why aren't you cc-ing the maintainers?
> 
> Sorry. I was about to bring you into the loop.
> 
> Yinghai posted 32bit native apic_ops(similar to my 64bit apic ops patch, which
> is different from pv_apic_ops) which is in tip/x86/x2apic and proposed a fix
> for VMI case aswell.
> 
> Based on my understanding, tip/x86/x2apic git commit
> 94a8c3c2437c8946f1b6c8e0b2c560a7db8ed3c6 is wrong and it should be fixed with
> something like
> http://marc.info/?l=linux-kernel&m=121614328831237&w=2

Looks better, but I need to read more context to find out where the
apic_ops variable comes from; I'll read the list for patches.

You are correct in that we will want to use the same wait_icr_idle
routine as native hardware; it's not clear from just this patch how that
happens.

Also, the VMI operations are sensitive to parameter order because they
interface with an ABI at the other end.  I need to check the parameter
order for apic read / write is still consistent with the ABI.

Zach

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