From: Alexander Gordeev <agordeev@linux.ibm.com>
Date: Sat, 13 Aug 2022 17:45:21 +0000 (+0200)
Subject: s390/boot: fix absolute zero lowcore corruption on boot
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=12dd19c159659ec9050f45dc8a2ff3c3917f4be3;p=linux.git

s390/boot: fix absolute zero lowcore corruption on boot

Crash dump always starts on CPU0. In case CPU0 is offline the
prefix page is not installed and the absolute zero lowcore is
used. However, struct lowcore::mcesad is never assigned and
stays zero. That leads to __machine_kdump() -> save_vx_regs()
call silently stores vector registers to the absolute lowcore
at 0x11b0 offset.

Fixes: a62bc0739253 ("s390/kdump: add support for vector extension")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---

diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c
index 60ac66aab1635..31cb9b00a36bb 100644
--- a/arch/s390/kernel/nmi.c
+++ b/arch/s390/kernel/nmi.c
@@ -64,7 +64,7 @@ static inline unsigned long nmi_get_mcesa_size(void)
  * structure. The structure is required for machine check happening
  * early in the boot process.
  */
-static struct mcesa boot_mcesa __initdata __aligned(MCESA_MAX_SIZE);
+static struct mcesa boot_mcesa __aligned(MCESA_MAX_SIZE);
 
 void __init nmi_alloc_mcesa_early(u64 *mcesad)
 {
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index ed4fbbbdd1b07..74adb433c2572 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -479,6 +479,7 @@ static void __init setup_lowcore_dat_off(void)
 	put_abs_lowcore(restart_data, lc->restart_data);
 	put_abs_lowcore(restart_source, lc->restart_source);
 	put_abs_lowcore(restart_psw, lc->restart_psw);
+	put_abs_lowcore(mcesad, lc->mcesad);
 
 	mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
 	if (!mcck_stack)