[Qemu-devel] [Bug 1694998] Re: PPC: msgsnd instruction leads to assertion

[Thomas Huth]

Could you please check whether this patch fixes the issue for you:

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -17,6 +17,7 @@
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 #include "qemu/osdep.h"
+#include "qemu/main-loop.h"
 #include "cpu.h"
 #include "exec/helper-proto.h"
 #include "exec/exec-all.h"
@@ -1132,6 +1133,7 @@ void helper_msgsnd(target_ulong rb)
         return;
     }
 
+    qemu_mutex_lock_iothread();
     CPU_FOREACH(cs) {
         PowerPCCPU *cpu = POWERPC_CPU(cs);
         CPUPPCState *cenv = &cpu->env;
@@ -1141,5 +1143,6 @@ void helper_msgsnd(target_ulong rb)
             cpu_interrupt(cs, CPU_INTERRUPT_HARD);
         }
     }
+    qemu_mutex_unlock_iothread();
 }
 #endif

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https://bugs.launchpad.net/bugs/1694998

Title:
  PPC: msgsnd instruction leads to assertion

Status in QEMU:
  New

Bug description:
  I tried to send doorbells (using msgsnd) between cores in guest OS. On QEMU 
v2.9.0 usage of msgsnd instruction leads to error:
  ERROR: <...>/qemu-new/translate-common.c:34:tcg_handle_interrupt: assertion 
failed: (qemu_mutex_iothread_locked())

  
  QEMU v2.8.0 works fine.

  QEMU run options: qemu-system-ppc -serial stdio -M ppce500 -cpu e500mc
  -smp 2 -m 512M -kernel pok.elf

  pok.elf attached

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