Re: [PATCH v3 3/5] x86: Call efi_memblock_x86_reserve_range() on native EFI platform only
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- To: "Matt Fleming" <matt@xxxxxxxxxxxxxxxxx>
- Subject: Re: [PATCH v3 3/5] x86: Call efi_memblock_x86_reserve_range() on native EFI platform only
- From: "Jan Beulich" <JBeulich@xxxxxxxx>
- Date: Wed, 26 Mar 2014 13:39:42 +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: <20140326133119.GD24856@console-pimps.org>
- 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> <20140326133119.GD24856@console-pimps.org>
>>> 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.
Jan
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