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s390x/tcg: fix DIAG 308 with > 1 VCPU (MTTCG) 

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 <david@redhat.com>
Message-Id: <20171116170526.12643-4-david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2017-11-16 18:05:26 +01:00 committed by Cornelia Huck
parent dc0bbef5e6
commit 7337c6eb98
1 changed files with 2 additions and 0 deletions
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2
target/s390x/misc_helper.c
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@ -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: