cacheinfo: add i/d cache_linesize_log

Signed-off-by: NEmilio G. Cota <cota@braap.org>
Message-Id: <20180910232752.31565-2-cota@braap.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

include/qemu/osdep.h

@@ -570,6 +570,8 @@ extern uintptr_t qemu_real_host_page_size;
 extern intptr_t qemu_real_host_page_mask;
 
 extern int qemu_icache_linesize;
+extern int qemu_icache_linesize_log;
 extern int qemu_dcache_linesize;
+extern int qemu_dcache_linesize_log;
 
 #endif

util/cacheinfo.c

@@ -7,9 +7,12 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/host-utils.h"
 
 int qemu_icache_linesize = 0;
+int qemu_icache_linesize_log;
 int qemu_dcache_linesize = 0;
+int qemu_dcache_linesize_log;
 
 /*
  * Operating system specific detection mechanisms.
@@ -172,6 +175,11 @@ static void __attribute__((constructor)) init_cache_info(void)
     arch_cache_info(&isize, &dsize);
     fallback_cache_info(&isize, &dsize);
 
+    assert((isize & (isize - 1)) == 0);
+    assert((dsize & (dsize - 1)) == 0);
+
     qemu_icache_linesize = isize;
+    qemu_icache_linesize_log = ctz32(isize);
     qemu_dcache_linesize = dsize;
+    qemu_dcache_linesize_log = ctz32(dsize);
 }