Re: [PATCH v3 3/5] x86: Call efi_memblock_x86_reserve_range() on native EFI platform only
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- To: Jan Beulich <JBeulich@xxxxxxxx>
- Subject: Re: [PATCH v3 3/5] x86: Call efi_memblock_x86_reserve_range() on native EFI platform only
- From: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
- Date: Wed, 26 Mar 2014 13:31:19 +0000
- Cc: david.vrabel@xxxxxxxxxx, ian.campbell@xxxxxxxxxx, stefano.stabellini@xxxxxxxxxxxxx, jeremy@xxxxxxxx, fenghua.yu@xxxxxxxxx, matt.fleming@xxxxxxxxx, tony.luck@xxxxxxxxx, x86@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, Daniel Kiper <daniel.kiper@xxxxxxxxxx>, konrad.wilk@xxxxxxxxxx, eshelton@xxxxxxxxx, mingo@xxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, hpa@xxxxxxxxx
- In-reply-to: <5332E2B9020000780000255D@nat28.tlf.novell.com>
- List-id: <linux-ia64.vger.kernel.org>
- References: <1395781076-12000-1-git-send-email-daniel.kiper@oracle.com> <1395781076-12000-4-git-send-email-daniel.kiper@oracle.com> <20140326130009.GB24856@console-pimps.org> <5332E2B9020000780000255D@nat28.tlf.novell.com>
- User-agent: Mutt/1.5.21 (2010-09-15)
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.
--
Matt Fleming, Intel Open Source Technology Center
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