From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Subject: Re: EFI runtime and kexec
Date: Fri, 01 Mar 2013 15:48:51 -0800
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To: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
Cc: David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>, Matt Fleming <matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>, linux-efi <linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
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On 03/01/2013 03:39 PM, Borislav Petkov wrote:
> Just commenting on this one for now, the rest tomorrow cuz I'm half
> asleep.
> 
> On Fri, Mar 01, 2013 at 11:30:25PM +0000, David Woodhouse wrote:
>> The other option, for the long term, is to fix the damn firmware to
>> allow SetVirtualAddressMap to be called more than once. It was stupid
>> for it to be a one-time call anyway.
> 
> Now this would be the cleanest solution. If we can do that, we can then
> simply call efi_enter_virtual_mode() in the kexec'd kernel without
> the need to pass any options to it. Actually, the kexec'd kernel can
> probably run the same efi code as the papa kernel.
> 

Well, if we can genuinely run with a zero relocation we don't even need
to worry about that.

	-hpa