linux-kernel - Re: [PATCH v3 3/5] x86: Call efi_memblock_x86_reserve

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Message-ID: <20140326133119.GD24856@console-pimps.org>
Date:	Wed, 26 Mar 2014 13:31:19 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	david.vrabel@...rix.com, ian.campbell@...rix.com,
	stefano.stabellini@...citrix.com, jeremy@...p.org,
	fenghua.yu@...el.com, matt.fleming@...el.com, tony.luck@...el.com,
	x86@...nel.org, tglx@...utronix.de, xen-devel@...ts.xenproject.org,
	boris.ostrovsky@...cle.com, Daniel Kiper <daniel.kiper@...cle.com>,
	konrad.wilk@...cle.com, eshelton@...ox.com, mingo@...hat.com,
	linux-efi@...r.kernel.org, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com
Subject: Re: [PATCH v3 3/5] x86: Call efi_memblock_x86_reserve_range() on
 native EFI platform only

On Wed, 26 Mar, at 01:22:49PM, Jan Beulich wrote:
> >>> On 26.03.14 at 14:00, <matt@...sole-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.

-- 
Matt Fleming, Intel Open Source Technology Center
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