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

Peter Jones
2013-10-14T15:58:07Z

On Sat, Oct 12, 2013 at 10:14:39AM +0800, Dave Young wrote:
> CCing Peter Jones .., Peter, any idea about the grub related problem?

What grub problem? As Matt was saying, grub2 isn't loading it as
EfiBootServicesCode/Data. grub2 is loading it as EfiLoaderData .

>
> 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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--
Peter