Messages in this thread | | | Date | Wed, 11 Feb 2015 15:55:24 +0000 | From | Matt Fleming <> | Subject | Re: [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
| |