linux-kernel - Re: [PATCH]x86 efi: do not export efi runtime map in case old map

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Message-ID: <20140530075219.GC28131@pd.tnic>
Date:	Fri, 30 May 2014 09:52:19 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Dave Young <dyoung@...hat.com>
Cc:	matt.fleming@...el.com, linux-kernel@...r.kernel.org,
	linux-efi@...r.kernel.org, vgoyal@...hat.com
Subject: Re: [PATCH]x86 efi: do not export efi runtime map in case old map

On Fri, May 30, 2014 at 11:20:10AM +0800, Dave Young wrote:
> 
> For ioremapped efi memory aka old_map the virt addresses are not persistant
> across kexec reboot. kexec-tools will read the runtime maps from sysfs then
> pass them to 2nd kernel and assuming kexec efi boot is ok. This will cause
> kexec boot failure.
> 
> To address this issue do not export runtime maps in case efi old_map so
> userspace can use no efi boot instead.
> 
> Signed-off-by: Dave Young <dyoung@...hat.com>

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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