From: Ackerley Tng ackerleytng@google.com
This tests the use of guest memory without explicit MapGPA calls.
Signed-off-by: Ackerley Tng ackerleytng@google.com Signed-off-by: Ryan Afranji afranji@google.com Signed-off-by: Sagi Shahar sagis@google.com --- .../selftests/kvm/x86_64/tdx_upm_test.c | 86 +++++++++++++++++-- 1 file changed, 77 insertions(+), 9 deletions(-)
diff --git a/tools/testing/selftests/kvm/x86_64/tdx_upm_test.c b/tools/testing/selftests/kvm/x86_64/tdx_upm_test.c index 44671874a4f1..bfa921f125a0 100644 --- a/tools/testing/selftests/kvm/x86_64/tdx_upm_test.c +++ b/tools/testing/selftests/kvm/x86_64/tdx_upm_test.c @@ -149,7 +149,7 @@ enum { * Does vcpu_run, and also manages memory conversions if requested by the TD. */ void vcpu_run_and_manage_memory_conversions(struct kvm_vm *vm, - struct kvm_vcpu *vcpu) + struct kvm_vcpu *vcpu, bool handle_conversions) { for (;;) { vcpu_run(vcpu); @@ -163,6 +163,13 @@ void vcpu_run_and_manage_memory_conversions(struct kvm_vm *vm, !(vm->arch.s_bit & vmcall_info->in_r12)); vmcall_info->status_code = 0; continue; + } else if (handle_conversions && + vcpu->run->exit_reason == KVM_EXIT_MEMORY_FAULT) { + handle_memory_conversion( + vm, vcpu->run->memory_fault.gpa, + vcpu->run->memory_fault.size, + vcpu->run->memory_fault.flags == KVM_MEMORY_EXIT_FLAG_PRIVATE); + continue; } else if ( vcpu->run->exit_reason == KVM_EXIT_IO && vcpu->run->io.port == TDX_UPM_TEST_ACCEPT_PRINT_PORT) { @@ -243,8 +250,53 @@ static void guest_upm_explicit(void) tdx_test_success(); }
+static void guest_upm_implicit(void) +{ + struct tdx_upm_test_area *test_area_gva_private = + (struct tdx_upm_test_area *)TDX_UPM_TEST_AREA_GVA_PRIVATE; + struct tdx_upm_test_area *test_area_gva_shared = + (struct tdx_upm_test_area *)TDX_UPM_TEST_AREA_GVA_SHARED; + + /* Check: host reading private memory does not modify guest's view */ + fill_test_area(test_area_gva_private, PATTERN_GUEST_GENERAL); + + tdx_test_report_to_user_space(SYNC_CHECK_READ_PRIVATE_MEMORY_FROM_HOST); + + TDX_UPM_TEST_ASSERT( + check_test_area(test_area_gva_private, PATTERN_GUEST_GENERAL)); + + /* Use focus area as shared */ + fill_focus_area(test_area_gva_shared, PATTERN_GUEST_FOCUS); + + /* General areas should not be affected */ + TDX_UPM_TEST_ASSERT( + check_general_areas(test_area_gva_private, PATTERN_GUEST_GENERAL)); + + tdx_test_report_to_user_space(SYNC_CHECK_READ_SHARED_MEMORY_FROM_HOST); + + /* Check that guest has the same view of shared memory */ + TDX_UPM_TEST_ASSERT( + check_focus_area(test_area_gva_shared, PATTERN_HOST_FOCUS)); + + /* Use focus area as private */ + fill_focus_area(test_area_gva_private, PATTERN_GUEST_FOCUS); + + /* General areas should be unaffected by remapping */ + TDX_UPM_TEST_ASSERT( + check_general_areas(test_area_gva_private, PATTERN_GUEST_GENERAL)); + + tdx_test_report_to_user_space(SYNC_CHECK_READ_PRIVATE_MEMORY_FROM_HOST_AGAIN); + + /* Check that guest can use private memory after focus area is remapped as private */ + TDX_UPM_TEST_ASSERT( + fill_and_check(test_area_gva_private, PATTERN_GUEST_GENERAL)); + + tdx_test_success(); +} + static void run_selftest(struct kvm_vm *vm, struct kvm_vcpu *vcpu, - struct tdx_upm_test_area *test_area_base_hva) + struct tdx_upm_test_area *test_area_base_hva, + bool implicit) { vcpu_run(vcpu); TDX_TEST_CHECK_GUEST_FAILURE(vcpu); @@ -263,7 +315,7 @@ static void run_selftest(struct kvm_vm *vm, struct kvm_vcpu *vcpu, TEST_ASSERT(check_test_area(test_area_base_hva, PATTERN_CONFIDENCE_CHECK), "Host should read PATTERN_CONFIDENCE_CHECK from guest's private memory.");
- vcpu_run_and_manage_memory_conversions(vm, vcpu); + vcpu_run_and_manage_memory_conversions(vm, vcpu, implicit); TDX_TEST_CHECK_GUEST_FAILURE(vcpu); TDX_TEST_ASSERT_IO(vcpu, TDX_TEST_REPORT_PORT, TDX_TEST_REPORT_SIZE, TDG_VP_VMCALL_INSTRUCTION_IO_WRITE); @@ -280,7 +332,7 @@ static void run_selftest(struct kvm_vm *vm, struct kvm_vcpu *vcpu, TEST_ASSERT(check_focus_area(test_area_base_hva, PATTERN_HOST_FOCUS), "Host should be able to use shared memory.");
- vcpu_run_and_manage_memory_conversions(vm, vcpu); + vcpu_run_and_manage_memory_conversions(vm, vcpu, implicit); TDX_TEST_CHECK_GUEST_FAILURE(vcpu); TDX_TEST_ASSERT_IO(vcpu, TDX_TEST_REPORT_PORT, TDX_TEST_REPORT_SIZE, TDG_VP_VMCALL_INSTRUCTION_IO_WRITE); @@ -329,18 +381,20 @@ static void guest_ve_handler(struct ex_regs *regs) TDX_UPM_TEST_ASSERT(!ret); }
-static void verify_upm_test(void) +static void verify_upm_test(bool implicit) { struct kvm_vm *vm; struct kvm_vcpu *vcpu;
+ void *guest_code; vm_vaddr_t test_area_gva_private; struct tdx_upm_test_area *test_area_base_hva; uint64_t test_area_npages;
vm = td_create(); td_initialize(vm, VM_MEM_SRC_ANONYMOUS, 0); - vcpu = td_vcpu_add(vm, 0, guest_upm_explicit); + guest_code = implicit ? guest_upm_implicit : guest_upm_explicit; + vcpu = td_vcpu_add(vm, 0, guest_code);
vm_install_exception_handler(vm, VE_VECTOR, guest_ve_handler);
@@ -379,13 +433,26 @@ static void verify_upm_test(void)
td_finalize(vm);
- printf("Verifying UPM functionality: explicit MapGPA\n"); + if (implicit) + printf("Verifying UPM functionality: implicit conversion\n"); + else + printf("Verifying UPM functionality: explicit MapGPA\n");
- run_selftest(vm, vcpu, test_area_base_hva); + run_selftest(vm, vcpu, test_area_base_hva, implicit);
kvm_vm_free(vm); }
+void verify_upm_test_explicit(void) +{ + verify_upm_test(false); +} + +void verify_upm_test_implicit(void) +{ + verify_upm_test(true); +} + int main(int argc, char **argv) { /* Disable stdout buffering */ @@ -397,5 +464,6 @@ int main(int argc, char **argv) return 0; }
- run_in_new_process(&verify_upm_test); + run_in_new_process(&verify_upm_test_explicit); + run_in_new_process(&verify_upm_test_implicit); }