Re: [Qemu-devel] [PATCH v3 05/11] s390x/misc_helper.c: wrap IO instructions in BQL

[Philippe Mathieu-Daudé]

On 03/07/2017 12:50 PM, Alex Bennée wrote:

Helpers that can trigger IO events (including interrupts) need to be
protected by the BQL. I've updated all the helpers that call into an
ioinst_handle_* functions.

Reported-by: Thomas Huth <th...@redhat.com>
Signed-off-by: Alex Bennée <alex.ben...@linaro.org>

Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org>

---
 target/s390x/misc_helper.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c
index 3cb942e8bb..93b0e61366 100644
--- a/target/s390x/misc_helper.c
+++ b/target/s390x/misc_helper.c
@@ -19,6 +19,7 @@
  */

 #include "qemu/osdep.h"
+#include "qemu/main-loop.h"
 #include "cpu.h"
 #include "exec/memory.h"
 #include "qemu/host-utils.h"
@@ -551,61 +552,81 @@ uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t 
order_code, uint32_t r1,
 void HELPER(xsch)(CPUS390XState *env, uint64_t r1)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    qemu_mutex_lock_iothread();
     ioinst_handle_xsch(cpu, r1);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(csch)(CPUS390XState *env, uint64_t r1)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    qemu_mutex_lock_iothread();
     ioinst_handle_csch(cpu, r1);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(hsch)(CPUS390XState *env, uint64_t r1)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    qemu_mutex_lock_iothread();
     ioinst_handle_hsch(cpu, r1);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(msch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    qemu_mutex_lock_iothread();
     ioinst_handle_msch(cpu, r1, inst >> 16);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(rchp)(CPUS390XState *env, uint64_t r1)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    qemu_mutex_lock_iothread();
     ioinst_handle_rchp(cpu, r1);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(rsch)(CPUS390XState *env, uint64_t r1)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    qemu_mutex_lock_iothread();
     ioinst_handle_rsch(cpu, r1);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(ssch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    qemu_mutex_lock_iothread();
     ioinst_handle_ssch(cpu, r1, inst >> 16);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(stsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    qemu_mutex_lock_iothread();
     ioinst_handle_stsch(cpu, r1, inst >> 16);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(tsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    qemu_mutex_lock_iothread();
     ioinst_handle_tsch(cpu, r1, inst >> 16);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(chsc)(CPUS390XState *env, uint64_t inst)
 {
     S390CPU *cpu = s390_env_get_cpu(env);
+    qemu_mutex_lock_iothread();
     ioinst_handle_chsc(cpu, inst >> 16);
+    qemu_mutex_unlock_iothread();
 }
 #endif