Patch "efi: Don't issue error message when booted under Xen" has been added to the 4.9-stable tree

Patch "efi: Don't issue error message when booted under Xen" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    efi: Don't issue error message when booted under Xen

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     efi-don-t-issue-error-message-when-booted-under-xen.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 1ea34adb87c969b89dfd83f1905a79161e9ada26 Mon Sep 17 00:00:00 2001
From: Juergen Gross <jgross@suse.com>
Date: Fri, 26 May 2017 12:36:47 +0100
Subject: efi: Don't issue error message when booted under Xen

From: Juergen Gross <jgross@suse.com>

commit 1ea34adb87c969b89dfd83f1905a79161e9ada26 upstream.

When booted as Xen dom0 there won't be an EFI memmap allocated. Avoid
issuing an error message in this case:

  [    0.144079] efi: Failed to allocate new EFI memmap

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170526113652.21339-2-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/platform/efi/quirks.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -358,6 +358,9 @@ void __init efi_free_boot_services(void)
 		free_bootmem_late(start, size);
 	}
 
+	if (!num_entries)
+		return;
+
 	new_size = efi.memmap.desc_size * num_entries;
 	new_phys = efi_memmap_alloc(num_entries);
 	if (!new_phys) {


Patches currently in stable-queue which might be from jgross@suse.com are

queue-4.9/efi-don-t-issue-error-message-when-booted-under-xen.patch