KVM: selftests: Move TDP mapping functions outside of vmx.c

Now that the functions are no longer VMX-specific, move them to
processor.c. Do a minor comment tweak replacing 'EPT' with 'TDP'.

No functional change intended.

Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Link: https://patch.msgid.link/20251230230150.4150236-15-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

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

@@ -1479,6 +1479,10 @@ void __virt_pg_map(struct kvm_vm *vm, struct kvm_mmu *mmu, uint64_t vaddr,
 void virt_map_level(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
 		    uint64_t nr_bytes, int level);
 
+void tdp_map(struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr, uint64_t size);
+void tdp_identity_map_default_memslots(struct kvm_vm *vm);
+void tdp_identity_map_1g(struct kvm_vm *vm,  uint64_t addr, uint64_t size);
+
 /*
  * Basic CPU control in CR0
  */

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

@@ -557,9 +557,6 @@ bool load_vmcs(struct vmx_pages *vmx);
 
 bool ept_1g_pages_supported(void);
 
-void tdp_map(struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr, uint64_t size);
-void tdp_identity_map_default_memslots(struct kvm_vm *vm);
-void tdp_identity_map_1g(struct kvm_vm *vm,  uint64_t addr, uint64_t size);
 bool kvm_cpu_has_ept(void);
 void vm_enable_ept(struct kvm_vm *vm);
 void prepare_virtualize_apic_accesses(struct vmx_pages *vmx, struct kvm_vm *vm);

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

@@ -472,6 +472,59 @@ void virt_arch_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
 	}
 }
 
+void __tdp_map(struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr,
+	       uint64_t 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(paddr + size > paddr, "Paddr overflow");
+
+	while (npages--) {
+		__virt_pg_map(vm, &vm->stage2_mmu, nested_paddr, paddr, level);
+		nested_paddr += page_size;
+		paddr += page_size;
+	}
+}
+
+void tdp_map(struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr,
+	     uint64_t size)
+{
+	__tdp_map(vm, nested_paddr, paddr, size, PG_LEVEL_4K);
+}
+
+/* Prepare an identity extended page table that maps all the
+ * physical pages in VM.
+ */
+void tdp_identity_map_default_memslots(struct kvm_vm *vm)
+{
+	uint32_t s, memslot = 0;
+	sparsebit_idx_t i, last;
+	struct userspace_mem_region *region = memslot2region(vm, memslot);
+
+	/* Only memslot 0 is mapped here, ensure it's the only one being used */
+	for (s = 0; s < NR_MEM_REGIONS; s++)
+		TEST_ASSERT_EQ(vm->memslots[s], 0);
+
+	i = (region->region.guest_phys_addr >> vm->page_shift) - 1;
+	last = i + (region->region.memory_size >> vm->page_shift);
+	for (;;) {
+		i = sparsebit_next_clear(region->unused_phy_pages, i);
+		if (i > last)
+			break;
+
+		tdp_map(vm, (uint64_t)i << vm->page_shift,
+			(uint64_t)i << vm->page_shift, 1 << vm->page_shift);
+	}
+}
+
+/* Identity map a region with 1GiB Pages. */
+void tdp_identity_map_1g(struct kvm_vm *vm, uint64_t addr, uint64_t size)
+{
+	__tdp_map(vm, addr, addr, size, PG_LEVEL_1G);
+}
+
 /*
  * Set Unusable Segment
  *

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

@@ -373,77 +373,6 @@ void prepare_vmcs(struct vmx_pages *vmx, void *guest_rip, void *guest_rsp)
 	init_vmcs_guest_state(guest_rip, guest_rsp);
 }
 
-/*
- * Map a range of EPT guest physical addresses to the VM's physical address
- *
- * Input Args:
- *   vm - Virtual Machine
- *   nested_paddr - Nested guest physical address to map
- *   paddr - VM Physical Address
- *   size - The size of the range to map
- *   level - The level at which to map the range
- *
- * Output Args: None
- *
- * Return: None
- *
- * Within the VM given by vm, creates a nested guest translation for the
- * page range starting at nested_paddr to the page range starting at paddr.
- */
-void __tdp_map(struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr,
-	       uint64_t size, int level)
-{
-	struct kvm_mmu *mmu = &vm->stage2_mmu;
-	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(paddr + size > paddr, "Paddr overflow");
-
-	while (npages--) {
-		__virt_pg_map(vm, mmu, nested_paddr, paddr, level);
-		nested_paddr += page_size;
-		paddr += page_size;
-	}
-}
-
-void tdp_map(struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr,
-	     uint64_t size)
-{
-	__tdp_map(vm, nested_paddr, paddr, size, PG_LEVEL_4K);
-}
-
-/* Prepare an identity extended page table that maps all the
- * physical pages in VM.
- */
-void tdp_identity_map_default_memslots(struct kvm_vm *vm)
-{
-	uint32_t s, memslot = 0;
-	sparsebit_idx_t i, last;
-	struct userspace_mem_region *region = memslot2region(vm, memslot);
-
-	/* Only memslot 0 is mapped here, ensure it's the only one being used */
-	for (s = 0; s < NR_MEM_REGIONS; s++)
-		TEST_ASSERT_EQ(vm->memslots[s], 0);
-
-	i = (region->region.guest_phys_addr >> vm->page_shift) - 1;
-	last = i + (region->region.memory_size >> vm->page_shift);
-	for (;;) {
-		i = sparsebit_next_clear(region->unused_phy_pages, i);
-		if (i > last)
-			break;
-
-		tdp_map(vm, (uint64_t)i << vm->page_shift,
-			(uint64_t)i << vm->page_shift, 1 << vm->page_shift);
-	}
-}
-
-/* Identity map a region with 1GiB Pages. */
-void tdp_identity_map_1g(struct kvm_vm *vm, uint64_t addr, uint64_t size)
-{
-	__tdp_map(vm, addr, addr, size, PG_LEVEL_1G);
-}
-
 bool kvm_cpu_has_ept(void)
 {
 	uint64_t ctrl;