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From: David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: chrisw-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	suresh.b.siddha-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
	mingo-X9Un+BFzKDI@public.gmane.org
Subject: Re: [PATCH 2/2] iommu: dmar -- reserve mmio space used by IOMMU
Date: Wed, 06 Jun 2012 09:26:23 +0100	[thread overview]
Message-ID: <1338971183.26785.33.camel@shinybook.infradead.org> (raw)
In-Reply-To: <20120606081600.GB5991-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>


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On Wed, 2012-06-06 at 10:16 +0200, Ingo Molnar wrote:
> So basically the patch-set is fine as-is, we just want a 
> sufficiently nasty sounding warning message about the BIOS bug, 

No. The other change that's required is that the warning and the
workaround need to trigger even when IOMMU support isn't built into the
kernel. This BIOS bug can bite you even when you aren't *using* the
IOMMU.

> If we could integrate Coreboot into the kernel and could build a 
> bzImage that one could write into the BIOS flash image and thus 
> have an updated and functional BIOS, that would be awesome.

People *have* used the kernel as a Coreboot payload, but it's not really
the best solution. For anything but deeply embedded devices, you
probably do want a real firmware of some kind (like Tianocore).

The point in having hardware which is fully supported by Coreboot is
that it gives you the choice. You *can* do the above, or more sensibly
you can use it to deploy an up-to-date and working Tianocore without the
type of bugs that we're discussing here. Or at least without the ones
which offend *you*.

-- 
dwmw2

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  parent reply	other threads:[~2012-06-06  8:26 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-04 21:29 [PATCH 0/2]intel-iommu: reserve IOMMU register space Donald Dutile
     [not found] ` <1338845342-12464-1-git-send-email-ddutile-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-06-04 21:29   ` [PATCH 1/2] iommu: dmar: replace printks with appropriate pr_*() Donald Dutile
     [not found]     ` <1338845342-12464-2-git-send-email-ddutile-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-06-04 22:15       ` Joe Perches
2012-06-04 22:28         ` Don Dutile
2012-06-04 21:29   ` [PATCH 2/2] iommu: dmar -- reserve mmio space used by IOMMU Donald Dutile
     [not found]     ` <1338845342-12464-3-git-send-email-ddutile-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-06-04 22:37       ` David Woodhouse
     [not found]         ` <1338849430.10884.288.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2012-06-04 23:09           ` Don Dutile
     [not found]             ` <4FCD401D.9000304-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-06-04 23:23               ` David Woodhouse
     [not found]                 ` <1338852196.26785.10.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2012-06-04 23:52                   ` Don Dutile
2012-06-06  8:16                   ` Ingo Molnar
     [not found]                     ` <20120606081600.GB5991-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2012-06-06  8:26                       ` David Woodhouse [this message]
     [not found]                         ` <1338971183.26785.33.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2012-06-06  8:29                           ` Ingo Molnar
     [not found]                             ` <20120606082900.GF5991-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2012-06-06  8:45                               ` David Woodhouse
     [not found]                                 ` <1338972329.26785.34.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2012-06-06 23:56                                   ` Chris Wright
2012-06-06 23:58                   ` Chris Wright

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