Messages in this thread | | | Date | Wed, 26 Mar 2014 13:39:42 +0000 | From | "Jan Beulich" <> | Subject | Re: [PATCH v3 3/5] x86: Call efi_memblock_x86_reserve_range() on native EFI platform only |
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>>> On 26.03.14 at 14:31, <matt@console-pimps.org> wrote: > On Wed, 26 Mar, at 01:22:49PM, Jan Beulich wrote: >> >>> On 26.03.14 at 14:00, <matt@console-pimps.org> wrote: >> > >> > This could do with a little bit more explanation. Why is it not >> > necessary to mark the EFI memory map that was passed to the kernel as >> > reserved in memblock? >> >> Because that's in memory Dom0 doesn't even see: The EFI memory >> map is visible to the hypervisor only. > > So where does boot_params.efi_info.efi_memmap point? > > If nowhere (i.e. it's NULL) that's no problem because memblock_reserve() > handles zero size regions just fine.
That's a question to Daniel - in our implementation (with a separate Xen kernel that can't run on bare hardware) boot_params as a whole simply doesn't exist.
Jan
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