linux-kernel - Re: [PATCH 12/12] EFI: Runtime services virtual mapping

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Message-ID: <20131012021439.GA4464@dhcp-16-126.nay.redhat.com>
Date:	Sat, 12 Oct 2013 10:14:39 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Borislav Petkov <bp@...en8.de>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...e.de>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Vivek Goyal <vgoyal@...hat.com>, linux-efi@...r.kernel.org,
	fwts-devel@...ts.ubuntu.com, pjones@...hat.com
Subject: Re: [PATCH 12/12] EFI: Runtime services virtual mapping

CCing Peter Jones .., Peter, any idea about the grub related problem?

On 10/11/13 at 09:42am, Dave Young wrote:
> Matt,
> 
> The kernel I referring is the boot kernel aka the 1st kernel,
> the boot loader is grub2 from Fedora 19.
> 
> [sorry for top reply because of using webmail]
> 
> 
> ----- Original Message -----
> From: "Matt Fleming" <matt@...sole-pimps.org>
> To: "Dave Young" <dyoung@...hat.com>
> Cc: "Borislav Petkov" <bp@...en8.de>, "X86 ML" <x86@...nel.org>, "LKML" <linux-kernel@...r.kernel.org>, "Borislav Petkov" <bp@...e.de>, "Matthew Garrett" <mjg59@...f.ucam.org>, "H. Peter Anvin" <hpa@...or.com>, "James Bottomley" <James.Bottomley@...senPartnership.com>, "Vivek Goyal" <vgoyal@...hat.com>, linux-efi@...r.kernel.org, fwts-devel@...ts.ubuntu.com
> Sent: Friday, October 11, 2013 6:27:06 PM
> Subject: Re: [PATCH 12/12] EFI: Runtime services virtual mapping
> 
> On Fri, 11 Oct, at 02:24:37PM, Dave Young wrote:
> > For the boot efi_reserve_boot_services code, it's mainly for the
> > SetVirtualAddressMap callback use, so boot regions should not be reused
> > before SetVirtualAddressMap, but the overlapping happens before the
> > efi_reserve_boot_services, isn't it a problem?
> 
> Hang on, which kernel are you referring to here? The boot kernel or the
> kexec'd kernel? I thought you were saying you noticed the overlap when
> running in the second (kexec'd) kernel?
> 
> The only reason that you would see this overlap in the first (boot)
> kernel is if the bootloader messed up and allocated the kernel text as
> EfiBootServicesCode/Data. I'd like to believe no bootloaders are still
> doing that.
> 
> -- 
> Matt Fleming, Intel Open Source Technology Center
> --
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