[v2,0/1] s390: nmi: fix virtual-physical address confusion

Message

Nico Boehr Feb. 16, 2023, 12:12 p.m. UTC

v2:
---
* remove unneeded cast (thanks Alexander)

When a machine check is received while in SIE, it is reinjected into the
guest in some cases. The respective code needs to access the sie_block,
which is taken from the backed up R14.

Since reinjection only occurs while we are in SIE (i.e. between the
labels sie_entry and sie_leave in entry.S and thus if CIF_MCCK_GUEST is
set), the backed up R14 will always contain a physical address in
s390_backup_mcck_info.

This currently works, because virtual and physical addresses are
the same.

Add phys_to_virt() to resolve the virtual-physical confusion.

Nico Boehr (1):
  s390: nmi: fix virtual-physical address confusion

 arch/s390/kernel/nmi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)