linux-kernel - Re: [PATCH 1/4] efi/x86: make efi_memmap_reserve only insert into boot mem areas

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Date:   Fri, 13 Jan 2017 05:20:09 +0800
From:   Dave Young <dyoung@...hat.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Matt Fleming <matt@...eblueprint.co.uk>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Nicolai Stange <nicstange@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "hpa@...or.com" <hpa@...or.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        bhsharma@...hat.com
Subject: Re: [PATCH 1/4] efi/x86: make efi_memmap_reserve only insert into
 boot mem areas

On 01/12/17 at 04:15pm, Ard Biesheuvel wrote:
> Hello Dave,
> 
> On 12 January 2017 at 09:41, Dave Young <dyoung@...hat.com> wrote:
> > There are memory ranges like below when I testing early efi_mem_reserve:
> >
> > efi: mem62: [Reserved           |   |  |  |  |  |  |  |   |  |  |  |  ] range=[0x0000000000000000-0xffffffffffffffff] (0MB)
> > efi: mem63: [Reserved           |   |  |  |  |  |  |  |   |  |  |  |  ] range=[0x0000000000000000-0xffffffffffffffff] (0MB)
> > efi: mem64: [Reserved           |   |  |  |  |  |  |  |   |  |  |  |  ] range=[0x0000000000000000-0xffffffffffffffff] (0MB)
> > efi: mem65: [Reserved           |   |  |  |  |  |  |  |   |  |  |  |  ] range=[0x0000000000000000-0xffffffffffffffff] (0MB)
> > efi: mem66: [Reserved           |   |  |  |  |  |  |  |   |  |  |  |  ] range=[0x0000000000000000-0xffffffffffffffff] (0MB)
> > efi: mem67: [Reserved           |   |  |  |  |  |  |  |   |  |  |  |  ] range=[0x0000000000000000-0xffffffffffffffff] (0MB)
> >
> 
> Did you spot Peter's patch to prune invalid memmap entries?
> 
> https://git.kernel.org/cgit/linux/kernel/git/efi/efi.git/commit/?h=next&id=b2a91a35445229
> 
> I would expect this patch to no longer be necessary with that in place, no?

Ard, good suggestion, I did not notice that patch, will try. Actually
I'm not sure about fake_mem handling, if we can filter out the invalid
ranges then it will be natural to drop this one after a test.

Thanks
Dave