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 4.9-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: xen-setup-don-t-relocate-p2m-over-existing-one.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@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-4.9/xen-setup-don-t-relocate-p2m-over-existing-one.patch