Re: [Xen-devel] [PATCH v3 3/5] x86: Call efi_memblock_x86_reserve_range() on native EFI platform only

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Wed, Mar 26, 2014 at 01:39:42PM +0000, Jan Beulich wrote:
> >>> On 26.03.14 at 14:31, <matt@xxxxxxxxxxxxxxxxx> wrote:
> > On Wed, 26 Mar, at 01:22:49PM, Jan Beulich wrote:
> >> >>> On 26.03.14 at 14:00, <matt@xxxxxxxxxxxxxxxxx> 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.

On my machine this function crashes on Xen so that is why I have changed
condition. However, if you say that this issue could be solved in
another way I will investigate it further.

Daniel

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