[PATCH AUTOSEL 6.3 38/67] s390/ipl: fix IPIB virtual vs physical address confusion

Sasha Levin
2023-05-25T18:36:17Z

From: Alexander Gordeev <agordeev@linux.ibm.com>

[ Upstream commit 2facd5d3980f3a26c04fe6ec8689a1d019a5812c ]

The pointer to IPL Parameter Information Block is stored
in the absolute lowcore for later use by dump tools. That
pointer is a virtual address, though it should be physical
instead.

Note, this does not fix a real issue, since virtual and
physical addresses are currently the same.

Suggested-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/s390/kernel/ipl.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 5f0f5c86963a9..e43ee9becbbb9 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -1936,14 +1936,13 @@ static struct shutdown_action __refdata dump_action = {

static void dump_reipl_run(struct shutdown_trigger *trigger)
{
- unsigned long ipib = (unsigned long) reipl_block_actual;
struct lowcore *abs_lc;
unsigned int csum;

csum = (__force unsigned int)
csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
abs_lc = get_abs_lowcore();
- abs_lc->ipib = ipib;
+ abs_lc->ipib = __pa(reipl_block_actual);
abs_lc->ipib_checksum = csum;
put_abs_lowcore(abs_lc);
dump_run(trigger);
--
2.39.2