qemu: Remove mapcache lock - we no longer have multiple threads in core qemu code.

Signed-off-by: Keir Fraser <keir@xensource.com>

tools/ioemu/Makefile.target

@@ -197,7 +197,6 @@ CPPFLAGS+=-D_GNU_SOURCE
 LIBS+=-lm
 LIBS+=-L../../libxc -lxenctrl -lxenguest
 LIBS+=-L../../xenstore -lxenstore
-LIBS+=-lpthread
 ifndef CONFIG_USER_ONLY
 LIBS+=-lz
 endif

tools/ioemu/target-i386-dm/exec-dm.c

@@ -125,17 +125,10 @@ static int io_mem_nb = 1;
 FILE *logfile;
 int loglevel;
 
-#ifdef MAPCACHE
-pthread_mutex_t mapcache_mutex;
-#endif
-
 void cpu_exec_init(CPUState *env)
 {
     CPUState **penv;
     int cpu_index;
-#ifdef MAPCACHE
-    pthread_mutexattr_t mxattr; 
-#endif
 
     env->next_cpu = NULL;
     penv = &first_cpu;
@@ -149,14 +142,6 @@ void cpu_exec_init(CPUState *env)
 
     /* alloc dirty bits array */
     phys_ram_dirty = qemu_malloc(phys_ram_size >> TARGET_PAGE_BITS);
-
-#ifdef MAPCACHE
-    /* setup memory access mutex to protect mapcache */
-    pthread_mutexattr_init(&mxattr); 
-    pthread_mutexattr_settype(&mxattr, PTHREAD_MUTEX_RECURSIVE);
-    pthread_mutex_init(&mapcache_mutex, &mxattr); 
-    pthread_mutexattr_destroy(&mxattr); 
-#endif
 }
 
 /* enable or disable low levels log */

tools/ioemu/vl.h

@@ -160,26 +160,16 @@ extern FILE *logfile;
 
 
 #if defined(__i386__) || defined(__x86_64__)
-
 #define MAPCACHE
-
 uint8_t *qemu_map_cache(target_phys_addr_t phys_addr);
 void     qemu_invalidate_map_cache(void);
-
-#include <pthread.h>
-extern  pthread_mutex_t mapcache_mutex;
-#define mapcache_lock() pthread_mutex_lock(&mapcache_mutex)
-#define mapcache_unlock() pthread_mutex_unlock(&mapcache_mutex)
-
 #else 
-
 #define qemu_invalidate_map_cache() ((void)0)
+#endif
 
 #define mapcache_lock()   ((void)0)
 #define mapcache_unlock() ((void)0)
 
-#endif
-
 extern int xc_handle;
 extern int domid;