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    SubjectRe: [PATCH] x86, boot: Allow 64bit EFI kernel to be loaded above 4G
    On Mon, 09 Feb, at 12:23:15PM, Yinghai Lu wrote:
    > On Mon, Feb 9, 2015 at 10:27 AM, Matt Fleming <matt@codeblueprint.co.uk> wrote:
    > > On Tue, 03 Feb, at 06:03:20PM, Yinghai Lu wrote:
    > >
    > > The first thing that comes to mind is the issues we experienced last
    > > year when adding support for loading initrds above 4GB to the EFI boot
    > > stub, c.f. commit 47226ad4f4cf ("x86/efi: Only load initrd above 4g on
    > > second try").
    > >
    > > Are things going to work correctly this time?
    >
    > That should be addressed the grub2.

    I vaguely remember thinking that the issue was only experienced when
    using the EFI_FILE protocol, which grub2 doesn't use. So the grub
    developers may be OK, but we should at least give them a heads up.

    > I was thinking that we may need to add mem_limit command together with
    > linuxefi and initrdefi.
    > or add linuxefi64/initrdefi64?

    No, we definitely do not want to add any more grub commands.

    > BTW, I tested loading kernel above grub2 on
    > virutalbox, qemu/kvm/OVMF, and real servers (ami ...) all work without problem.
    >
    > wonder if we need have one black list for 64bit UEFI that does not
    > support access
    > memory above 4G.

    We have been successful, so far, in not introducing these kind of
    blacklists. It would be a shame to start now.

    --
    Matt Fleming, Intel Open Source Technology Center


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