linux-kernel - Re: Use PCI ROMs from EFI boot services

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Date:	Wed, 05 Dec 2012 21:06:56 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-efi@...r.kernel.org, mfleming@...el.com,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: Use PCI ROMs from EFI boot services

On Wed, 2012-12-05 at 13:09 -0700, Bjorn Helgaas wrote:
> 
> David, Eric, what about the kexec question?  It looks to me like this
> wouldn't make things worse than they are today.  If I understand
> correctly, today we don't use ROM data from EFI on either an initial
> boot or a kexec.  After this patch, we could use EFI ROM data on the
> initial boot, but not after a kexec.  So it's worse in the sense that
> the kexec case doesn't match the initial boot, but at least it's not
> something that used to work and is now broken.

Yeah, kexec under EFI doesn't work too well. I have a firmware running
in qemu locally which will let you call SetVirtualAddressMap more than
once, which is a step towards fixing it sanely. It got preempted, but
I'll take another look at it shortly.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation




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