linux-kernel - Re: [patch 7/7 v2] x86: add xloadflags bit for efi runtime support on kexec

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Message-ID: <20131114015346.GF4081@dhcp-16-126.nay.redhat.com>
Date:	Thu, 14 Nov 2013 09:53:46 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	x86@...nel.org, mjg59@...f.ucam.org, hpa@...or.com,
	James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
	ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.infradead.org, bp@...en8.de
Subject: Re: [patch 7/7 v2] x86: add xloadflags bit for efi runtime support
 on kexec

On 11/13/13 at 03:50pm, Matt Fleming wrote:
> On Tue, 05 Nov, at 04:20:14PM, dyoung@...hat.com wrote:
> > Old kexec-tools can not load new kernel. The reason is previously kexec-tools
> > do not fill efi_info in x86 setup header thus efi init fail and switch
> > to noefi boot. In new kexec-tools it will by default fill efi_info and
> > pass other efi required infomation to 2nd kernel so kexec kernel efi
> > initialization will success finally.
> > 
> > To prevent from breaking userspace, add a new xloadflags bit so kexec-tools
> > will check the flag and switch to old logic.
> > 
> > Signed-off-by: Dave Young <dyoung@...hat.com>
> > ---
> >  arch/x86/boot/header.S                |    9 ++++++++-
> >  arch/x86/include/uapi/asm/bootparam.h |    1 +
> >  2 files changed, 9 insertions(+), 1 deletion(-)
> > 
> > --- linux-2.6.orig/arch/x86/boot/header.S
> > +++ linux-2.6/arch/x86/boot/header.S
> > @@ -391,7 +391,14 @@ xloadflags:
> >  #else
> >  # define XLF23 0
> >  #endif
> > -			.word XLF0 | XLF1 | XLF23
> > +
> > +#if defined(CONFIG_X86_64) && defined(CONFIG_EFI)
> 
> && defined(CONFIG_KEXEC) ?

Will add above.

> 
> > +# define XLF4 XLF_EFI_KEXEC
> > +#else
> > +# define XLF4 0
> > +#endif
> > +
> 
> -- 
> Matt Fleming, Intel Open Source Technology Center
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