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[qemu-s390x] [PULL for-2.11 2/4] s390x/tcg: fix DIAG 308 with > 1 VCPU (
From: |
Cornelia Huck |
Subject: |
[qemu-s390x] [PULL for-2.11 2/4] s390x/tcg: fix DIAG 308 with > 1 VCPU (MTTCG) |
Date: |
Mon, 20 Nov 2017 16:21:43 +0100 |
From: David Hildenbrand <address@hidden>
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 <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Thomas Huth <address@hidden>
Signed-off-by: Cornelia Huck <address@hidden>
---
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