Currently, multi threaded TCG with > 1 VCPU gets stuck during IPL, when
the bios tries to switch to the loaded kernel via DIAG 308.
As run_on_cpu() is used, we run into a deadlock after handling the reset.
We need the iolock (just like KVM).
Signed-off-by: David Hildenbrand <da...@redhat.com>
---
target/s390x/misc_helper.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c
index 4afd90b969..d272851e1c 100644
--- a/target/s390x/misc_helper.c
+++ b/target/s390x/misc_helper.c
@@ -103,7 +103,9 @@ void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t
r3, uint32_t num)
break;
case 0x308:
/* ipl */
+ qemu_mutex_lock_iothread();
handle_diag_308(env, r1, r3);
+ qemu_mutex_unlock_iothread();
r = 0;
break;
case 0x288:
--
2.13.6
