linux-kernel - Re: [PATCH 4.11 00/28] 4.11.1-stable review

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Date:   Thu, 25 May 2017 12:39:08 +0100
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Shuah Khan <shuahkh@....samsung.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        akpm@...ux-foundation.org, linux@...ck-us.net,
        patches@...nelci.org, ben.hutchings@...ethink.co.uk,
        stable@...r.kernel.org, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-efi@...r.kernel.org
Subject: Re: [PATCH 4.11 00/28] 4.11.1-stable review

On Mon, 15 May, at 11:28:16AM, Shuah Khan wrote:
> Hi Matt,
> 
> On 05/15/2017 08:36 AM, Matt Fleming wrote:
> > On Fri, 12 May, at 10:01:41AM, Shuah Khan wrote:
> >>
> >> Greg/Matt,
> >>
> >> I started seeing this maybe since 4.11, so it isn't really a 4.11.1
> >> issue, however sounds like this shouldn't be an error message, since
> >> it is showing up on an older platform.
> >>
> >> efi: EFI_MEMMAP is not enabled.
> >> efi: Failed to lookup EFI memory descriptor for 0x00000000d9e0f018
> >>
> >>
> >> From 816e76129ed5fadd28e526c43397c79775194b5c Mon Sep 17 00:00:00 2001
> >> From: Matt Fleming <matt@...eblueprint.co.uk>
> >> Date: Mon, 29 Feb 2016 21:22:52 +0000
> >> Subject: [PATCH] efi: Allow drivers to reserve boot services forever
> >>
> >> This change was introduced in Commit: 816e76129ed5fadd28e526c43397c79775194b5c
> >>
> >> Matt!
> >>
> >> Shouldn't this be a debug message?? Is this a really an error??
> > 
> > Yes, it's most likely an error. We shouldn't be trying to reserve
> > EFI regions if we can't find them in the memory map.
> > 
> > Can you provide the full dmesg, please?
> > 
> 
> Please see attached dmesg and dmidecode output. Please let me know if you need
> any other information.
 
Did you use git bisect to find the above commit that introduced this
error message? Because while the error message itself was merged in
the above commit there were no users until commit 8e80632fb23f
("efi/esrt: Use efi_mem_reserve() and avoid a kmalloc()").

Can you apply the attached patch, boot your machine with the efi=debug
command line option and capture the dmesg output? It doesn't look like
your machine is booting using EFI.

---

diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index 30031d5293c4..7f942df48f42 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -193,6 +193,7 @@ void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size)
 
 	if (efi_mem_desc_lookup(addr, &md)) {
 		pr_err("Failed to lookup EFI memory descriptor for %pa\n", &addr);
+		WARN_ON(1);
 		return;
 	}