[PATCH v2 07/10] s390x: smp: Use full PSW to bringup new cpu

Janosch Frank
2020-04-23T09:10:31Z

Up to now we ignored the psw mask and only used the psw address when
bringing up a new cpu. For DAT we need to also load the mask, so let's
do that.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
---
lib/s390x/smp.c | 2 ++
s390x/cstart64.S | 3 ++-
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/s390x/smp.c b/lib/s390x/smp.c
index 3f86243..6ef0335 100644
--- a/lib/s390x/smp.c
+++ b/lib/s390x/smp.c
@@ -202,6 +202,8 @@ int smp_cpu_setup(uint16_t addr, struct psw psw)
cpu->stack = (uint64_t *)alloc_pages(2);

/* Start without DAT and any other mask bits. */
+ cpu->lowcore->sw_int_psw.mask = psw.mask;
+ cpu->lowcore->sw_int_psw.addr = psw.addr;
cpu->lowcore->sw_int_grs[14] = psw.addr;
cpu->lowcore->sw_int_grs[15] = (uint64_t)cpu->stack + (PAGE_SIZE * 4);
lc->restart_new_psw.mask = 0x0000000180000000UL;
diff --git a/s390x/cstart64.S b/s390x/cstart64.S
index ecffbe0..e084f13 100644
--- a/s390x/cstart64.S
+++ b/s390x/cstart64.S
@@ -161,7 +161,8 @@ smp_cpu_setup_state:
lctlg %c0, %c0, GEN_LC_SW_INT_CRS
/* We should only go once through cpu setup and not for every restart */
stg %r14, GEN_LC_RESTART_NEW_PSW + 8
- brasl %r14, %r14
+ larl %r14, 0f
+ lpswe GEN_LC_SW_INT_PSW
/* If the function returns, just loop here */
0: j 0

--
2.25.1