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[Qemu-devel] [PULL 2/2] s390x/misc_helper.c: wrap s390_virtio_hypercall

From: Alexander Graf
Subject: [Qemu-devel] [PULL 2/2] s390x/misc_helper.c: wrap s390_virtio_hypercall in BQL
Date: Tue, 25 Apr 2017 13:44:54 +0200

From: Aurelien Jarno <address@hidden>

s390_virtio_hypercall can trigger IO events and interrupts, most notably
when using virtio-ccw devices.

Reviewed-by: Alexander Graf <address@hidden>
Signed-off-by: Aurelien Jarno <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
Fixes: 278f5e98c647 ("s390x/misc_helper.c: wrap IO instructions in BQL")
Signed-off-by: Alexander Graf <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 83d3894..eca8244 100644
--- a/target/s390x/misc_helper.c
+++ b/target/s390x/misc_helper.c
@@ -288,7 +288,9 @@ void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t 
r3, uint32_t num)
     switch (num) {
     case 0x500:
         /* KVM hypercall */
+        qemu_mutex_lock_iothread();
         r = s390_virtio_hypercall(env);
+        qemu_mutex_unlock_iothread();
     case 0x44:
         /* yield */

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