linux-kernel - Re: [PATCH -v2] EFI: Runtime services virtual mapping

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Message-ID: <20130930210921.GC6116@redhat.com>
Date:	Mon, 30 Sep 2013 17:09:21 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Dave Young <dyoung@...hat.com>,
	X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...e.de>,
	Matt Fleming <matt@...sole-pimps.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	James Bottomley <james.bottomley@...senpartnership.com>,
	linux-efi@...r.kernel.org
Subject: Re: [PATCH -v2] EFI: Runtime services virtual mapping

On Mon, Sep 30, 2013 at 11:06:46PM +0200, Borislav Petkov wrote:
> On Mon, Sep 30, 2013 at 04:46:42PM -0400, Vivek Goyal wrote:
> > On Mon, Sep 30, 2013 at 10:41:54PM +0200, Borislav Petkov wrote:
> > 
> > [..]
> > > hpa, so, for the struct efi_mapping thing to work, I will have to grep
> > > dmesg of the first kernel to get an output like the one below, filter
> > > the runtime regions so that I can build the struct efi_mapping array of
> > > mem regions which I pass on to the second, kexec kernel with setup_data.
> > 
> > Any data you need to pass to second kernel will have to be exported to
> > user space either using /sys or /proc so that kexec-tools can parse it.
> 
> And I cannot parse dmesg? Because I have all the info there already.

dmesg can 't relied on. It is just a kernel buffer which root can
clear. (dmesg --clear). So required info has to be exported to user
space in a suitable form.

Thanks
Vivek
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