HV: Add flush_address_space API.

flush_address_space is used to flush address space by clflushopt instruction.

Signed-off-by: Jack Ren <jack.ren@intel.com>
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Reviewed-by: Li, Fei1 <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: yliu80

hypervisor/arch/x86/mmu.c

@@ -294,3 +294,16 @@ void init_paging(void)
 	/* set ptep in sanitized_page point to itself */
 	sanitize_pte((uint64_t *)sanitized_page);
 }
+
+/*
+ * @pre: addr != NULL  && size != 0
+ */
+void flush_address_space(void *addr, uint64_t size)
+{
+	uint64_t n = 0UL;
+
+	while (n < size) {
+		clflushopt((char *)addr + n);
+		n += CACHE_LINE_SIZE;
+	}
+}

hypervisor/include/arch/x86/mmu.h

@@ -150,6 +150,18 @@ void flush_vpid_single(uint16_t vpid);
  * @return None
  */
 void flush_vpid_global(void);
+
+/**
+ * @brief Flush address space
+ *
+ * @param[in] addr the specified virtual address
+ *
+ * @param[in] size the specified size to flush
+ *
+ * @return None
+ */
+void flush_address_space(void *addr, uint64_t size);
+
 /**
  * @brief Guest-physical mappings and combined mappings invalidation
  *