hw/xen: Use the IEC binary prefix definitions

It eases code review, unit is explicit.

Patch generated using:

  $ git grep -E '(1024|2048|4096|8192|(<<|>>).?(10|20|30))' hw/ include/hw/

and modified manually.
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NAlan Robinson <Alan.Robinson@ts.fujitsu.com>
Message-Id: <20180625124238.25339-12-f4bug@amsat.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/block/xen_disk.c

@@ -20,6 +20,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/units.h"
 #include <sys/ioctl.h>
 #include <sys/uio.h>
 
@@ -814,7 +815,7 @@ static int blk_connect(struct XenDevice *xendev)
     xen_pv_printf(xendev, 1, "type \"%s\", fileproto \"%s\", filename \"%s\","
                   " size %" PRId64 " (%" PRId64 " MB)\n",
                   blkdev->type, blkdev->fileproto, blkdev->filename,
-                  blkdev->file_size, blkdev->file_size >> 20);
+                  blkdev->file_size, blkdev->file_size / MiB);
 
     /* Fill in number of sector size and number of sectors */
     xenstore_write_be_int(xendev, "sector-size", blkdev->file_blk);

hw/i386/xen/xen-mapcache.c

@@ -9,6 +9,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/units.h"
 #include "qemu/error-report.h"
 
 #include <sys/resource.h>
@@ -46,7 +47,7 @@
  * From empirical tests I observed that qemu use 75MB more than the
  * max_mcache_size.
  */
-#define NON_MCACHE_MEMORY_SIZE (80 * 1024 * 1024)
+#define NON_MCACHE_MEMORY_SIZE (80 * MiB)
 
 typedef struct MapCacheEntry {
     hwaddr paddr_index;

hw/xenpv/xen_domainbuild.c

 #include "qemu/osdep.h"
+#include "qemu/units.h"
 #include "hw/xen/xen_backend.h"
 #include "xen_domainbuild.h"
 #include "qemu/timer.h"
@@ -75,9 +76,9 @@ int xenstore_domain_init1(const char *kernel, const char *ramdisk,
     xenstore_write_str(dom, "vm",     vm);
 
     /* memory */
-    xenstore_write_int(dom, "memory/target", ram_size >> 10);  // kB
-    xenstore_write_int(vm, "memory",         ram_size >> 20);  // MB
-    xenstore_write_int(vm, "maxmem",         ram_size >> 20);  // MB
+    xenstore_write_int(dom, "memory/target", ram_size / KiB);
+    xenstore_write_int(vm, "memory",         ram_size / MiB);
+    xenstore_write_int(vm, "maxmem",         ram_size / MiB);
 
     /* cpus */
     for (i = 0; i < smp_cpus; i++) {
@@ -113,7 +114,7 @@ int xenstore_domain_init2(int xenstore_port, int xenstore_mfn,
 
     /* console */
     xenstore_write_str(dom, "console/type",     "ioemu");
-    xenstore_write_int(dom, "console/limit",    128 * 1024);
+    xenstore_write_int(dom, "console/limit",    128 * KiB);
     xenstore_write_int(dom, "console/ring-ref", console_mfn);
     xenstore_write_int(dom, "console/port",     console_port);
     xen_config_dev_console(0);
@@ -260,7 +261,7 @@ int xen_domain_build_pv(const char *kernel, const char *ramdisk,
     }
 #endif
 
-    rc = xc_domain_setmaxmem(xen_xc, xen_domid, ram_size >> 10);
+    rc = xc_domain_setmaxmem(xen_xc, xen_domid, ram_size / KiB);
     if (rc < 0) {
         fprintf(stderr, "xen: xc_domain_setmaxmem() failed\n");
         goto err;
@@ -269,7 +270,7 @@ int xen_domain_build_pv(const char *kernel, const char *ramdisk,
     xenstore_port = xc_evtchn_alloc_unbound(xen_xc, xen_domid, 0);
     console_port = xc_evtchn_alloc_unbound(xen_xc, xen_domid, 0);
 
-    rc = xc_linux_build(xen_xc, xen_domid, ram_size >> 20,
+    rc = xc_linux_build(xen_xc, xen_domid, ram_size / MiB,
                         kernel, ramdisk, cmdline,
                         0, flags,
                         xenstore_port, &xenstore_mfn,