hv: ept: remove EPT paging table for HPA to GPA

There's no need to walk these paging tables to transfer HPA to GPA
for a VM, so remove it.

Tracked-On: #1124
Signed-off-by: Li, Fei1 <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: lifeix

hypervisor/arch/x86/ept.c

@@ -58,9 +58,6 @@ void destroy_ept(struct vm *vm)
 	if (vm->arch_vm.nworld_eptp != NULL) {
 		free_ept_mem((uint64_t *)vm->arch_vm.nworld_eptp);
 	}
-	if (vm->arch_vm.m2p != NULL) {
-		free_ept_mem((uint64_t *)vm->arch_vm.m2p);
-	}
 }
 /* using return value INVALID_HPA as error code */
 uint64_t local_gpa2hpa(struct vm *vm, uint64_t gpa, uint32_t *size)
@@ -238,11 +235,6 @@ void ept_mr_add(struct vm *vm, uint64_t *pml4_page,
 	}
 
 	mmu_add(pml4_page, hpa, gpa, size, prot, PTT_EPT);
-	/* No need to create inverted page tables for trusty memory */
-	if ((void *)pml4_page == vm->arch_vm.nworld_eptp) {
-		mmu_add((uint64_t *)vm->arch_vm.m2p,
-			gpa, hpa, size, prot, PTT_EPT);
-	}
 
 	foreach_vcpu(i, vm, vcpu) {
 		vcpu_make_request(vcpu, ACRN_REQUEST_EPT_FLUSH);
@@ -271,17 +263,12 @@ void ept_mr_del(struct vm *vm, uint64_t *pml4_page,
 {
 	struct vcpu *vcpu;
 	uint16_t i;
-	uint64_t hpa = gpa2hpa(vm, gpa);
 
 	dev_dbg(ACRN_DBG_EPT, "%s,vm[%d] gpa 0x%llx size 0x%llx\n",
 			__func__, vm->vm_id, gpa, size);
 
 	mmu_modify_or_del(pml4_page, gpa, size,
 			0UL, 0UL, PTT_EPT, MR_DEL);
-	if ((void *)pml4_page == vm->arch_vm.nworld_eptp) {
-		mmu_modify_or_del((uint64_t *)vm->arch_vm.m2p,
-				hpa, size, 0UL, 0UL, PTT_EPT, MR_DEL);
-	}
 
 	foreach_vcpu(i, vm, vcpu) {
 		vcpu_make_request(vcpu, ACRN_REQUEST_EPT_FLUSH);

hypervisor/arch/x86/guest/vm.c

@@ -88,9 +88,7 @@ int create_vm(struct vm_description *vm_desc, struct vm **rtn_vm)
 	vm->hw.gpa_lowtop = 0UL;
 
 	vm->arch_vm.nworld_eptp = alloc_paging_struct();
-	vm->arch_vm.m2p = alloc_paging_struct();
-	if ((vm->arch_vm.nworld_eptp == NULL) ||
-			(vm->arch_vm.m2p == NULL)) {
+	if (vm->arch_vm.nworld_eptp == NULL) {
 		pr_fatal("%s, alloc memory for EPTP failed\n", __func__);
 		status = -ENOMEM;
 		goto err;
@@ -179,10 +177,6 @@ int create_vm(struct vm_description *vm_desc, struct vm **rtn_vm)
 
 	vioapic_cleanup(vm_ioapic(vm));
 
-	if (vm->arch_vm.m2p != NULL) {
-		free(vm->arch_vm.m2p);
-	}
-
 	if (vm->arch_vm.nworld_eptp != NULL) {
 		free(vm->arch_vm.nworld_eptp);
 	}

hypervisor/include/arch/x86/guest/vm.h

@@ -97,7 +97,6 @@ struct vm_arch {
 	 * but Normal World can not access Secure World's memory.
 	 */
 	void *sworld_eptp;
-	void *m2p;		/* machine address to guest physical address */
 	void *tmp_pg_array;	/* Page array for tmp guest paging struct */
 	struct acrn_vioapic vioapic;	/* Virtual IOAPIC base address */
 	struct acrn_vpic vpic;      /* Virtual PIC */