[kvm-unit-tests,PULL,7/9] s390x: smp: Wait for cpu setup to finish
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Message ID 20200204071335.18180-8-thuth@redhat.com
State New
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  • [kvm-unit-tests,PULL,1/9] s390x: smp: Cleanup smp.c
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Commit Message

Thomas Huth Feb. 4, 2020, 7:13 a.m. UTC
From: Janosch Frank <frankja@linux.ibm.com>

We store the user provided psw address into restart new, so a psw
restart does not lead us through setup again.

Also we wait on smp_cpu_setup() until the cpu has finished setup
before returning. This is necessary for z/VM and LPAR where sigp is

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200201152851.82867-8-frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
 lib/s390x/smp.c  | 3 +++
 s390x/cstart64.S | 2 ++
 2 files changed, 5 insertions(+)

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diff --git a/lib/s390x/smp.c b/lib/s390x/smp.c
index 4578003..3f86243 100644
--- a/lib/s390x/smp.c
+++ b/lib/s390x/smp.c
@@ -210,6 +210,9 @@  int smp_cpu_setup(uint16_t addr, struct psw psw)
 	/* Start processing */
 	smp_cpu_restart_nolock(addr, NULL);
+	/* Wait until the cpu has finished setup and started the provided psw */
+	while (lc->restart_new_psw.addr != psw.addr)
+		mb();
 	return rc;
diff --git a/s390x/cstart64.S b/s390x/cstart64.S
index 86dd4c4..9af6bb3 100644
--- a/s390x/cstart64.S
+++ b/s390x/cstart64.S
@@ -159,6 +159,8 @@  smp_cpu_setup_state:
 	xgr	%r1, %r1
 	lmg     %r0, %r15, GEN_LC_SW_INT_GRS
 	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
 	br	%r14