Commit 12dd19c1 authored by Alexander Gordeev's avatar Alexander Gordeev Committed by Vasily Gorbik

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: a62bc073 ("s390/kdump: add support for vector extension")
Reviewed-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent 7c8d42fd
No related merge requests found
......@@ -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)
{
......
......@@ -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)
......
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