target/mips: hold BQL in mips_vpe_wake()

Hold BQL whenever mips_vpe_wake() is invoked.

Without this patch, MIPS MT with MTTCG enabled triggers an abort in
tcg_handle_interrupt() due to an unlocked access to cpu_interrupt().
This patch makes sure that the BQL is held in this case.

Signed-off-by: Goran Ferenc <goran.ferenc@imgtec.com>
Signed-off-by: Miodrag Dinic <miodrag.dinic@imgtec.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Acked-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

target/mips/op_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 "internal.h"
 #include "qemu/host-utils.h"
@@ -638,7 +639,9 @@ static inline void mips_vpe_wake(MIPSCPU *c)
     /* Don't set ->halted = 0 directly, let it be done via cpu_has_work
        because there might be other conditions that state that c should
        be sleeping.  */
+    qemu_mutex_lock_iothread();
     cpu_interrupt(CPU(c), CPU_INTERRUPT_WAKE);
+    qemu_mutex_unlock_iothread();
 }
 
 static inline void mips_vpe_sleep(MIPSCPU *cpu)