[PATCH 5.15 061/230] s390/setup: preserve memory at OLDMEM_BASE and OLDMEM_SIZE

[Greg Kroah-Hartman]

From: Alexander Egorenkov <egorenar@xxxxxxxxxxxxx>

[ Upstream commit 6b4b54c7ca347bcb4aa7a3cc01aa16e84ac7fbe4 ]

We need to preserve the values at OLDMEM_BASE and OLDMEM_SIZE which are
used by zgetdump in case when kdump crashes. In that case zgetdump will
attempt to read OLDMEM_BASE and OLDMEM_SIZE in order to find out where
the memory range [0 - OLDMEM_SIZE] belonging to the production kernel is.

Fixes: f1a546947431 ("s390/setup: don't reserve memory that occupied decompressor's head")
Cc: stable@xxxxxxxxxxxxxxx # 5.15+
Signed-off-by: Alexander Egorenkov <egorenar@xxxxxxxxxxxxx>
Acked-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 arch/s390/kernel/setup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 2ebde341d057..36c1f31dfd66 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -798,6 +798,8 @@ static void __init check_initrd(void)
 static void __init reserve_kernel(void)
 {
 	memblock_reserve(0, STARTUP_NORMAL_OFFSET);
+	memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
+	memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
 	memblock_reserve(__amode31_base, __eamode31 - __samode31);
 	memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
 	memblock_reserve(__pa(_stext), _end - _stext);
-- 
2.35.1