hv: multiarch: replace memset with sanitize_pte

for x86, when using a new page to set up page table,
sanitize to specific hpa page address is needed, however,
for other arch, sanitized to 0 is fine. To avoid duplicate memory
setting at the time of alloc_page and sanitize pte, replace
memset in alloc_page with sanitized pte operation.

Tracked-On: #8831
Signed-off-by: hangliu1 <hang1.liu@intel.com>
Reviewed-by: Fei Li <fei1.li@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>

hypervisor/common/mmu.c

@@ -54,7 +54,7 @@ struct page *alloc_page(struct page_pool *pool)
 		 */
 		panic("no dummy aviable!");
 	}
-	(void)memset(page, 0U, PAGE_SIZE);
+	sanitize_pte((uint64_t *)page, NULL);
 	return page;
 }
 
@@ -621,7 +621,6 @@ void pgtable_add_map(uint64_t *pgtl3_page, uint64_t paddr_base, uint64_t vaddr_b
 void *pgtable_create_root(const struct pgtable *table)
 {
 	uint64_t *page = (uint64_t *)alloc_page(table->pool);
-	sanitize_pte(page, table);
 	return page;
 }
 

hypervisor/include/common/mmu.h

@@ -92,6 +92,7 @@ static inline uint64_t get_pgentry(const uint64_t *pte)
 static inline void set_pgentry(uint64_t *ptep, uint64_t pte, const struct pgtable *table)
 {
 	*ptep = pte;
+	if (table && table->flush_cache_pagewalk)
 		table->flush_cache_pagewalk(ptep);
 }