This is a note to let you know that I've just added the patch titled
xen/setup: Don't relocate p2m over existing one
to the 4.4-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:
xen-setup-don-t-relocate-p2m-over-existing-one.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7ecec8503af37de6be4f96b53828d640a968705f Mon Sep 17 00:00:00 2001
From: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Date: Mon, 12 Dec 2016 14:35:13 +0000
Subject: xen/setup: Don't relocate p2m over existing one
From: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
commit 7ecec8503af37de6be4f96b53828d640a968705f upstream.
When relocating the p2m, take special care not to relocate it so
that is overlaps with the current location of the p2m/initrd. This is
needed since the full extent of the current location is not marked as a
reserved region in the e820.
This was seen to happen to a dom0 with a large initial p2m and a small
reserved region in the middle of the initial p2m.
Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/xen/setup.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -713,10 +713,9 @@ static void __init xen_reserve_xen_mfnli
size = PFN_PHYS(xen_start_info->nr_p2m_frames);
}
- if (!xen_is_e820_reserved(start, size)) {
- memblock_reserve(start, size);
+ memblock_reserve(start, size);
+ if (!xen_is_e820_reserved(start, size))
return;
- }
#ifdef CONFIG_X86_32
/*
@@ -727,6 +726,7 @@ static void __init xen_reserve_xen_mfnli
BUG();
#else
xen_relocate_p2m();
+ memblock_free(start, size);
#endif
}
Patches currently in stable-queue which might be from ross.lagerwall@xxxxxxxxxx are
queue-4.4/xen-setup-don-t-relocate-p2m-over-existing-one.patch