linux-kernel - Re: [PATCH 3/4] Revert "x86: disable IOMMUs on kernel crash"

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Message-ID: <20100406174257.GG29241@sequoia.sous-sol.org>
Date:	Tue, 6 Apr 2010 10:42:57 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Joerg Roedel <joro@...tes.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Bernhard Walle <bernhard@...lle.de>, nhorman@...hat.com,
	nhorman@...driver.com, Joerg Roedel <joerg.roedel@....com>,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Chris Wright <chrisw@...s-sol.org>, hbabu@...ibm.com,
	iommu@...ts.linux-foundation.org, vgoyal@...hat.com
Subject: Re: [PATCH 3/4] Revert "x86: disable IOMMUs on kernel crash"

* Joerg Roedel (joro@...tes.org) wrote:
> On Sun, Apr 04, 2010 at 02:44:36AM -0700, Eric W. Biederman wrote:
> > Joerg Roedel <joro@...tes.org> writes:
> > 
> > > On Sun, Apr 04, 2010 at 09:24:30AM +0200, Bernhard Walle wrote:
> > >> Am 03.04.10 19:49, schrieb Eric W. Biederman:
> > >> > Not a problem.  We require a lot of things of the kdump kernel,
> > >> > and it is immediately apparent in a basic sanity test.
> > >> 
> > >> Also, in most cases (for example: distribution kernels), the kdump
> > >> kernel nowadays is identical to the running kernel. So, if the running
> > >> kernel has IOMMU support, the kdump kernel also has.
> > >
> > > Yes, I know. But is that a requirement for kexec?
> > 
> > For normal kexec no.  That path is expected to do a clean hardware
> > shutdown.
> > 
> > For kexec on panic aka kdump the requirement is that your your crash
> > kernel be able to initialize your hardware from any state it can be
> > put in.
> 
> Ok, if you show me where this is documented for everybody then I am
> probably convinced :-)
> We should fixup the gart initialization anyway.

So, you planning to pull in all 4 patches then?

thanks,
-chris
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