linux-kernel - Re: [PATCH v4 09/12] x86: add xloadflags bit for efi runtime support on kexec

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Date:	Fri, 29 Nov 2013 16:44:14 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
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, greg@...ah.com, matt@...sole-pimps.org,
	toshi.kani@...com
Subject: Re: [PATCH v4 09/12] x86: add xloadflags bit for efi runtime support
 on kexec

On 11/27/13 at 03:27pm, Borislav Petkov wrote:
> On Tue, Nov 26, 2013 at 01:57:54PM +0800, Dave Young wrote:
> > Old kexec-tools can not load new kernel. The reason is previously kexec-tools
> 
> The reason is, kexec-tools ... previously, thus efi failed to initialize ...

Good suggestion

> 
> > 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.
> 
> 		      succeed

Will fix

> 
> > 
> > To prevent from breaking userspace, add a new xloadflags bit so kexec-tools
> > will check the flag and switch to old logic.
> > 
> > changelog:
> > Matt: +&& defined(CONFIG_KEXEC)
> > HPA: document the flag.
> > 
> > Signed-off-by: Dave Young <dyoung@...hat.com>
> 
> Other than that:
> 
> Acked-by: Borislav Petkov <bp@...e.de>
> 

Thanks
Dave
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