HV:treewide:C99-friendly per_cpu implementation change the per_cpu method

The current implementation of per_cpu relies on several non-c99 features,
and in additional involves arbitrary pointer arithmetic which is not MIS-
RA C friendly.

This patch introduces struct per_cpu_region which holds all the per_cpu
variables. Allocation of per_cpu data regions and access to per_cpu vari-
ables are greatly simplified, at the cost of making all per_cpu varaibl-
es accessible in files.

Signed-off-by: Huihuang Shi <huihuang.shi@intel.com>

hypervisor/debug/logmsg.c

@@ -5,23 +5,13 @@
  */
 
 #include <hypervisor.h>
-
-#define LOG_ENTRY_SIZE		80
-
-/* Size of buffer used to store a message being logged,
- * should align to LOG_ENTRY_SIZE.
- */
-#define LOG_MESSAGE_MAX_SIZE	(4 * LOG_ENTRY_SIZE)
-
+#include <per_cpu.h>
 /* buf size should be identical to the size in hvlog option, which is
  * transfered to SOS:
  * bsp/uefi/clearlinux/acrn.conf: hvlog=2M@0x1FE00000
  */
 #define HVLOG_BUF_SIZE		(2*1024*1024)
 
-DEFINE_CPU_DATA(char [LOG_MESSAGE_MAX_SIZE], logbuf);
-DEFINE_CPU_DATA(struct shared_buf *, earlylog_sbuf);
-
 struct logmsg {
 	uint32_t flags;
 	int seq;