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

Dave Young
2013-10-12T02:15:19Z

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@console-pimps.org>
> To: "Dave Young" <dyoung@redhat.com>
> Cc: "Borislav Petkov" <bp@alien8.de>, "X86 ML" <x86@kernel.org>, "LKML" <linux-kernel@vger.kernel.org>, "Borislav Petkov" <bp@suse.de>, "Matthew Garrett" <mjg59@srcf.ucam.org>, "H. Peter Anvin" <hpa@zytor.com>, "James Bottomley" <James.Bottomley@HansenPartnership.com>, "Vivek Goyal" <vgoyal@redhat.com>, linux-efi@vger.kernel.org, fwts-devel@lists.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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