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[PULL,2/2] s390x/misc_helper.c: wrap s390_virtio_hypercall in BQL

Message ID 1493120694-120464-1-git-send-email-agraf@suse.de
State New
Headers show

Commit Message

Alexander Graf April 25, 2017, 11:44 a.m. UTC 
From: Aurelien Jarno <aurelien@aurel32.net>

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

Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Fixes: 278f5e98c647 ("s390x/misc_helper.c: wrap IO instructions in BQL")
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 target/s390x/misc_helper.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

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();
         break;
     case 0x44:
         /* yield */