KVM: selftests: Replace "u64 nested_paddr" with "gpa_t l2_gpa"

In x86's nested TDP APIs, use the appropriate gpa_t typedef and rename
variables from nested_paddr to l2_gpa to match KVM x86's nomenclature.

No functional change intended.

Link: https://patch.msgid.link/20260420212004.3938325-19-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

tools/testing/selftests/kvm/include/x86/processor.h

@@ -1514,7 +1514,7 @@ void virt_map_level(struct kvm_vm *vm, gva_t gva, u64 paddr,
 
 void vm_enable_tdp(struct kvm_vm *vm);
 bool kvm_cpu_has_tdp(void);
-void tdp_map(struct kvm_vm *vm, u64 nested_paddr, u64 paddr, u64 size);
+void tdp_map(struct kvm_vm *vm, gpa_t l2_gpa, u64 paddr, u64 size);
 void tdp_identity_map_default_memslots(struct kvm_vm *vm);
 void tdp_identity_map_1g(struct kvm_vm *vm,  u64 addr, u64 size);
 u64 *tdp_get_pte(struct kvm_vm *vm, u64 l2_gpa);

tools/testing/selftests/kvm/lib/x86/processor.c

@@ -495,26 +495,24 @@ bool kvm_cpu_has_tdp(void)
 	return kvm_cpu_has_ept() || kvm_cpu_has_npt();
 }
 
-void __tdp_map(struct kvm_vm *vm, u64 nested_paddr, u64 paddr,
-	       u64 size, int level)
+void __tdp_map(struct kvm_vm *vm, gpa_t l2_gpa, u64 paddr, u64 size, int level)
 {
 	size_t page_size = PG_LEVEL_SIZE(level);
 	size_t npages = size / page_size;
 
-	TEST_ASSERT(nested_paddr + size > nested_paddr, "Vaddr overflow");
+	TEST_ASSERT(l2_gpa + size > l2_gpa, "L2 GPA overflow");
 	TEST_ASSERT(paddr + size > paddr, "Paddr overflow");
 
 	while (npages--) {
-		__virt_pg_map(vm, &vm->stage2_mmu, nested_paddr, paddr, level);
-		nested_paddr += page_size;
+		__virt_pg_map(vm, &vm->stage2_mmu, l2_gpa, paddr, level);
+		l2_gpa += page_size;
 		paddr += page_size;
 	}
 }
 
-void tdp_map(struct kvm_vm *vm, u64 nested_paddr, u64 paddr,
-	     u64 size)
+void tdp_map(struct kvm_vm *vm, gpa_t l2_gpa, u64 paddr, u64 size)
 {
-	__tdp_map(vm, nested_paddr, paddr, size, PG_LEVEL_4K);
+	__tdp_map(vm, l2_gpa, paddr, size, PG_LEVEL_4K);
 }
 
 /* Prepare an identity extended page table that maps all the