[PATCH 06/45] KVM: selftests: Test address translation for Hyper-V direct L2 hypercalls

[Paolo Bonzini <pbonzini@redhat.com>]

Test that the TLB flush hypercalls, when executed by L2, translate their
input addresses through the guest's EPT or NPT.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://patch.msgid.link/20260918135030.171564-5-pbonzini@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 tools/testing/selftests/kvm/x86/hyperv_evmcs.c    | 12 +++++++++++-
 tools/testing/selftests/kvm/x86/hyperv_svm_test.c | 13 ++++++++++++-
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86/hyperv_evmcs.c b/tools/testing/selftests/kvm/x86/hyperv_evmcs.c
index c81f2dd4f2a1..2e1150c4bbbf 100644
--- a/tools/testing/selftests/kvm/x86/hyperv_evmcs.c
+++ b/tools/testing/selftests/kvm/x86/hyperv_evmcs.c
@@ -18,6 +18,8 @@
 #include "hyperv.h"
 #include "vmx.h"
 
+#define L2_HCALL_INPUT_GPA	0x100000000ull
+
 static int ud_count;
 
 static void guest_ud_handler(struct ex_regs *regs)
@@ -64,6 +66,8 @@ void l2_guest_code(void)
 	rdmsr_from_l2(MSR_GS_BASE); /* intercepted */
 
 	/* L2 TLB flush tests */
+	hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE,
+			 L2_HCALL_INPUT_GPA, 0);
 	hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | HV_HYPERCALL_FAST_BIT, 0x0,
 			 HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | HV_FLUSH_ALL_PROCESSORS);
 	rdmsr_from_l2(MSR_FS_BASE);
@@ -239,7 +243,7 @@ static struct kvm_vcpu *save_restore_vm(struct kvm_vm *vm,
 int main(int argc, char *argv[])
 {
 	gva_t vmx_pages_gva = 0, hv_pages_gva = 0;
-	gva_t hcall_page;
+	gva_t hcall_input_page, hcall_page;
 
 	struct kvm_vcpu *vcpu;
 	struct kvm_vm *vm;
@@ -250,17 +254,23 @@ int main(int argc, char *argv[])
 	TEST_REQUIRE(kvm_has_cap(KVM_CAP_NESTED_STATE));
 	TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS));
 	TEST_REQUIRE(kvm_hv_cpu_has(HV_X64_NESTED_DIRECT_FLUSH));
+	TEST_REQUIRE(kvm_cpu_has_ept());
 
 	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+	vm_enable_ept(vm);
 
 	hcall_page = vm_alloc_pages(vm, 1);
 	memset(addr_gva2hva(vm, hcall_page), 0x0,  getpagesize());
+	hcall_input_page = vm_alloc_page(vm);
+	memset(addr_gva2hva(vm, hcall_input_page), 0, getpagesize());
 
 	vcpu_set_hv_cpuid(vcpu);
 	vcpu_enable_evmcs(vcpu);
 
 	vcpu_alloc_vmx(vm, &vmx_pages_gva);
 	vcpu_alloc_hyperv_test_pages(vm, &hv_pages_gva);
+	tdp_identity_map_default_memslots(vm);
+	tdp_map(vm, L2_HCALL_INPUT_GPA, addr_gva2gpa(vm, hcall_input_page), PAGE_SIZE);
 	vcpu_args_set(vcpu, 3, vmx_pages_gva, hv_pages_gva, addr_gva2gpa(vm, hcall_page));
 	vcpu_set_msr(vcpu, HV_X64_MSR_VP_INDEX, vcpu->id);
 
diff --git a/tools/testing/selftests/kvm/x86/hyperv_svm_test.c b/tools/testing/selftests/kvm/x86/hyperv_svm_test.c
index 3a3dc31072e8..1c95b86ce2a5 100644
--- a/tools/testing/selftests/kvm/x86/hyperv_svm_test.c
+++ b/tools/testing/selftests/kvm/x86/hyperv_svm_test.c
@@ -18,6 +18,8 @@
 #include "svm_util.h"
 #include "hyperv.h"
 
+#define L2_HCALL_INPUT_GPA	0x100000000ull
+
 /* Exit to L1 from L2 with RDMSR instruction */
 static inline void rdmsr_from_l2(u32 msr)
 {
@@ -45,6 +47,8 @@ void l2_guest_code(void)
 	GUEST_SYNC(5);
 
 	/* L2 TLB flush tests */
+	hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE,
+			 L2_HCALL_INPUT_GPA, 0);
 	hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE |
 			 HV_HYPERCALL_FAST_BIT, 0x0,
 			 HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES |
@@ -146,7 +150,7 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm,
 int main(int argc, char *argv[])
 {
 	gva_t nested_gva = 0, hv_pages_gva = 0;
-	gva_t hcall_page;
+	gva_t hcall_input_page, hcall_page;
 	struct kvm_vcpu *vcpu;
 	struct kvm_vm *vm;
 	struct ucall uc;
@@ -154,15 +158,22 @@ int main(int argc, char *argv[])
 
 	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
 	TEST_REQUIRE(kvm_hv_cpu_has(HV_X64_NESTED_DIRECT_FLUSH));
+	TEST_REQUIRE(kvm_cpu_has_npt());
 
 	/* Create VM */
 	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+	vm_enable_npt(vm);
 	vcpu_set_hv_cpuid(vcpu);
 	vcpu_alloc_svm(vm, &nested_gva);
 	vcpu_alloc_hyperv_test_pages(vm, &hv_pages_gva);
 
 	hcall_page = vm_alloc_pages(vm, 1);
 	memset(addr_gva2hva(vm, hcall_page), 0x0,  getpagesize());
+	hcall_input_page = vm_alloc_page(vm);
+	memset(addr_gva2hva(vm, hcall_input_page), 0, getpagesize());
+
+	tdp_identity_map_default_memslots(vm);
+	tdp_map(vm, L2_HCALL_INPUT_GPA, addr_gva2gpa(vm, hcall_input_page), PAGE_SIZE);
 
 	vcpu_args_set(vcpu, 3, nested_gva, hv_pages_gva, addr_gva2gpa(vm, hcall_page));
 	vcpu_set_msr(vcpu, HV_X64_MSR_VP_INDEX, vcpu->id);
-- 
2.52.0