hv: pgtable: add pgtable_create_root

Add pgtable_create_root to allocate a page for PMl4 page table page.

Tracked-On: #5830
Signed-off-by: Li Fei1 <fei1.li@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>

hypervisor/arch/x86/guest/vm.c

@@ -503,7 +503,7 @@ int32_t create_vm(uint16_t vm_id, uint64_t pcpu_bitmap, struct acrn_vm_config *v
 	vm->hw.created_vcpus = 0U;
 
 	init_ept_pgtable(&vm->arch_vm.ept_pgtable, vm->vm_id);
-	vm->arch_vm.nworld_eptp = alloc_ept_page(vm);
+	vm->arch_vm.nworld_eptp = pgtable_create_root(&vm->arch_vm.ept_pgtable);
 	sanitize_pte((uint64_t *)vm->arch_vm.nworld_eptp, &vm->arch_vm.ept_pgtable);
 
 	(void)memcpy_s(&vm->uuid[0], sizeof(vm->uuid),

hypervisor/arch/x86/mmu.c

@@ -307,7 +307,7 @@ void init_paging(void)
 	}
 
 	/* Allocate memory for Hypervisor PML4 table */
-	ppt_mmu_pml4_addr = alloc_page(ppt_pgtable.pool);
+	ppt_mmu_pml4_addr = pgtable_create_root(&ppt_pgtable);
 
 	/* Map all memory regions to UC attribute */
 	pgtable_add_map((uint64_t *)ppt_mmu_pml4_addr, 0UL, 0UL, high64_max_ram - 0UL, attr_uc, &ppt_pgtable);

hypervisor/arch/x86/pagetable.c

@@ -430,6 +430,11 @@ void pgtable_add_map(uint64_t *pml4_page, uint64_t paddr_base, uint64_t vaddr_ba
 	}
 }
 
+void *pgtable_create_root(const struct pgtable *table)
+{
+	return (uint64_t *)alloc_page(table->pool);
+}
+
 /**
  * @pre (pml4_page != NULL) && (pg_size != NULL)
  */

hypervisor/include/arch/x86/pgtable.h

@@ -304,6 +304,7 @@ static inline uint64_t pdpte_large(uint64_t pdpte)
 	return pdpte & PAGE_PSE;
 }
 
+void *pgtable_create_root(const struct pgtable *table);
 /**
  *@pre (pml4_page != NULL) && (pg_size != NULL)
  */