The test verifies IO writes of various sizes from the guest to the host.
Signed-off-by: Sagi Shahar <sa...@google.com>
---
.../selftests/kvm/include/x86/tdx/tdcall.h | 3 +
tools/testing/selftests/kvm/x86/tdx_vm_test.c | 79 ++++++++++++++++++-
2 files changed, 81 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/include/x86/tdx/tdcall.h
b/tools/testing/selftests/kvm/include/x86/tdx/tdcall.h
index a6c966e93486..e7440f7fe259 100644
--- a/tools/testing/selftests/kvm/include/x86/tdx/tdcall.h
+++ b/tools/testing/selftests/kvm/include/x86/tdx/tdcall.h
@@ -7,6 +7,9 @@
#include <linux/bits.h>
#include <linux/types.h>
+#define TDG_VP_VMCALL_SUCCESS 0x0000000000000000
+#define TDG_VP_VMCALL_INVALID_OPERAND 0x8000000000000000
+
#define TDX_HCALL_HAS_OUTPUT BIT(0)
#define TDX_HYPERCALL_STANDARD 0
diff --git a/tools/testing/selftests/kvm/x86/tdx_vm_test.c
b/tools/testing/selftests/kvm/x86/tdx_vm_test.c
index 22143d16e0d1..f646da032004 100644
--- a/tools/testing/selftests/kvm/x86/tdx_vm_test.c
+++ b/tools/testing/selftests/kvm/x86/tdx_vm_test.c
@@ -308,6 +308,81 @@ void verify_get_td_vmcall_info(void)
printf("\t ... PASSED\n");
}
+#define TDX_IO_WRITES_TEST_PORT 0x51
+
+/*
+ * Verifies IO functionality by writing values of different sizes
+ * to the host.
+ */
+void guest_io_writes(void)
+{
+ uint64_t byte_4 = 0xFFABCDEF;
+ uint64_t byte_2 = 0xABCD;
+ uint64_t byte_1 = 0xAB;
+ uint64_t ret;
+
+ ret = tdg_vp_vmcall_instruction_io(TDX_IO_WRITES_TEST_PORT, 1,
+ PORT_WRITE, &byte_1);
+ tdx_assert_error(ret);
+
+ ret = tdg_vp_vmcall_instruction_io(TDX_IO_WRITES_TEST_PORT, 2,
+ PORT_WRITE, &byte_2);
+ tdx_assert_error(ret);
+
+ ret = tdg_vp_vmcall_instruction_io(TDX_IO_WRITES_TEST_PORT, 4,
+ PORT_WRITE, &byte_4);
+ tdx_assert_error(ret);
+
+ /* Write an invalid number of bytes. */
+ ret = tdg_vp_vmcall_instruction_io(TDX_IO_WRITES_TEST_PORT, 5,
+ PORT_WRITE, &byte_4);
+ tdx_assert_error(ret);
+
+ tdx_test_success();
+}
+
+void verify_guest_writes(void)
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_vm *vm;
+ uint32_t byte_4;
+ uint16_t byte_2;
+ uint8_t byte_1;
+
+ vm = td_create();
+ td_initialize(vm, VM_MEM_SRC_ANONYMOUS, 0);
+ vcpu = td_vcpu_add(vm, 0, guest_io_writes);
+ td_finalize(vm);
+
+ printf("Verifying guest writes:\n");
+
+ tdx_run(vcpu);
+ tdx_test_assert_io(vcpu, TDX_IO_WRITES_TEST_PORT, 1, PORT_WRITE);
+ byte_1 = *(uint8_t *)((void *)vcpu->run + vcpu->run->io.data_offset);
+
+ tdx_run(vcpu);
+ tdx_test_assert_io(vcpu, TDX_IO_WRITES_TEST_PORT, 2, PORT_WRITE);
+ byte_2 = *(uint16_t *)((void *)vcpu->run + vcpu->run->io.data_offset);
+
+ tdx_run(vcpu);
+ tdx_test_assert_io(vcpu, TDX_IO_WRITES_TEST_PORT, 4, PORT_WRITE);
+ byte_4 = *(uint32_t *)((void *)vcpu->run + vcpu->run->io.data_offset);
+
+ TEST_ASSERT_EQ(byte_1, 0xAB);
+ TEST_ASSERT_EQ(byte_2, 0xABCD);
+ TEST_ASSERT_EQ(byte_4, 0xFFABCDEF);
+
+ td_vcpu_run(vcpu);
+ TEST_ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_SYSTEM_EVENT);
+ TEST_ASSERT_EQ(vcpu->run->system_event.data[12],
TDG_VP_VMCALL_INVALID_OPERAND);
+
+ tdx_run(vcpu);
+ tdx_test_assert_success(vcpu);
+
+ kvm_vm_free(vm);
+ printf("\t ... PASSED\n");
+}
+
int main(int argc, char **argv)
{
ksft_print_header();
@@ -315,7 +390,7 @@ int main(int argc, char **argv)
if (!is_tdx_enabled())
ksft_exit_skip("TDX is not supported by the KVM. Exiting.\n");
- ksft_set_plan(5);
+ ksft_set_plan(6);
ksft_test_result(!run_in_new_process(&verify_td_lifecycle),
"verify_td_lifecycle\n");
ksft_test_result(!run_in_new_process(&verify_report_fatal_error),
@@ -326,6 +401,8 @@ int main(int argc, char **argv)
"verify_td_cpuid\n");
ksft_test_result(!run_in_new_process(&verify_get_td_vmcall_info),
"verify_get_td_vmcall_info\n");
+ ksft_test_result(!run_in_new_process(&verify_guest_writes),
+ "verify_guest_writes\n");
ksft_finished();
return 0;
--
2.50.0.rc2.692.g299adb8693-goog
