Verifies TDVMCALL<INSTRUCTION.IO> READ and WRITE operations.
Signed-off-by: Sagi Shahar sagis@google.com --- .../selftests/kvm/include/x86/tdx/test_util.h | 20 +++++ .../selftests/kvm/lib/x86/tdx/test_util.c | 35 +++++++++ tools/testing/selftests/kvm/x86/tdx_vm_test.c | 78 ++++++++++++++++++- 3 files changed, 130 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/x86/tdx/test_util.h b/tools/testing/selftests/kvm/include/x86/tdx/test_util.h index dafeee9af1dc..cf11955d56d6 100644 --- a/tools/testing/selftests/kvm/include/x86/tdx/test_util.h +++ b/tools/testing/selftests/kvm/include/x86/tdx/test_util.h @@ -13,6 +13,19 @@ #define PORT_READ 0 #define PORT_WRITE 1
+/* + * Assert that some IO operation involving tdg_vp_vmcall_instruction_io() was + * called in the guest. + */ +void tdx_test_assert_io(struct kvm_vcpu *vcpu, uint16_t port, uint8_t size, + uint8_t direction); + +/* + * Run the tdx vcpu and check if there was some failure in the guest, either + * an exception like a triple fault, or if a tdx_test_fatal() was hit. + */ +void tdx_run(struct kvm_vcpu *vcpu); + /* * Run a test in a new process. * @@ -57,4 +70,11 @@ void tdx_test_fatal(uint64_t error_code); */ void tdx_test_fatal_with_data(uint64_t error_code, uint64_t data_gpa);
+/* + * Assert on @error and report the @error to userspace. + * Return value from tdg_vp_vmcall_report_fatal_error() is ignored since execution + * is not expected to continue beyond this point. + */ +void tdx_assert_error(uint64_t error); + #endif // SELFTEST_TDX_TEST_UTIL_H diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/test_util.c b/tools/testing/selftests/kvm/lib/x86/tdx/test_util.c index 6c82a0c3bd37..4ccc5298ba25 100644 --- a/tools/testing/selftests/kvm/lib/x86/tdx/test_util.c +++ b/tools/testing/selftests/kvm/lib/x86/tdx/test_util.c @@ -8,8 +8,37 @@
#include "kvm_util.h" #include "tdx/tdx.h" +#include "tdx/tdx_util.h" #include "tdx/test_util.h"
+void tdx_test_assert_io(struct kvm_vcpu *vcpu, uint16_t port, uint8_t size, + uint8_t direction) +{ + TEST_ASSERT(vcpu->run->exit_reason == KVM_EXIT_IO, + "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n", + vcpu->run->exit_reason, + exit_reason_str(vcpu->run->exit_reason)); + + TEST_ASSERT(vcpu->run->exit_reason == KVM_EXIT_IO && + vcpu->run->io.port == port && + vcpu->run->io.size == size && + vcpu->run->io.direction == direction, + "Got unexpected IO exit values: %u (%s) %u %u %u\n", + vcpu->run->exit_reason, + exit_reason_str(vcpu->run->exit_reason), + vcpu->run->io.port, vcpu->run->io.size, + vcpu->run->io.direction); +} + +void tdx_run(struct kvm_vcpu *vcpu) +{ + td_vcpu_run(vcpu); + if (vcpu->run->exit_reason == KVM_EXIT_SYSTEM_EVENT) + TEST_FAIL("Guest reported error. error code: %lld (0x%llx)\n", + vcpu->run->system_event.data[12], + vcpu->run->system_event.data[13]); +} + int run_in_new_process(void (*func)(void)) { int wstatus; @@ -69,3 +98,9 @@ void tdx_test_fatal(uint64_t error_code) { tdx_test_fatal_with_data(error_code, 0); } + +void tdx_assert_error(uint64_t error) +{ + if (error) + tdx_test_fatal(error); +} diff --git a/tools/testing/selftests/kvm/x86/tdx_vm_test.c b/tools/testing/selftests/kvm/x86/tdx_vm_test.c index 7d6d71602761..97330e28f236 100644 --- a/tools/testing/selftests/kvm/x86/tdx_vm_test.c +++ b/tools/testing/selftests/kvm/x86/tdx_vm_test.c @@ -3,6 +3,7 @@ #include <signal.h>
#include "kvm_util.h" +#include "tdx/tdcall.h" #include "tdx/tdx.h" #include "tdx/tdx_util.h" #include "tdx/test_util.h" @@ -25,7 +26,7 @@ static void verify_td_lifecycle(void)
printf("Verifying TD lifecycle:\n");
- td_vcpu_run(vcpu); + tdx_run(vcpu); tdx_test_assert_success(vcpu);
kvm_vm_free(vm); @@ -69,9 +70,78 @@ void verify_report_fatal_error(void) TEST_ASSERT_EQ(vcpu->run->system_event.data[12], 0x0BAAAAAD00000000); TEST_ASSERT_EQ(vcpu->run->system_event.data[13], 0);
- td_vcpu_run(vcpu); + tdx_run(vcpu); + tdx_test_assert_success(vcpu); + + kvm_vm_free(vm); + printf("\t ... PASSED\n"); +} + +#define TDX_IOEXIT_TEST_PORT 0x50 + +/* + * Verifies IO functionality by writing a |value| to a predefined port. + * Verifies that the read value is |value| + 1 from the same port. + * If all the tests are passed then write a value to port TDX_TEST_PORT + */ +void guest_ioexit(void) +{ + uint64_t data_out, data_in; + uint64_t ret; + + data_out = 0xAB; + ret = tdg_vp_vmcall_instruction_io(TDX_IOEXIT_TEST_PORT, 1, + PORT_WRITE, &data_out); + tdx_assert_error(ret); + + ret = tdg_vp_vmcall_instruction_io(TDX_IOEXIT_TEST_PORT, 1, + PORT_READ, &data_in); + tdx_assert_error(ret); + + if (data_in != 0xAC) + tdx_test_fatal(data_in); + + tdx_test_success(); +} + +void verify_td_ioexit(void) +{ + struct kvm_vcpu *vcpu; + uint32_t port_data; + struct kvm_vm *vm; + + vm = td_create(); + td_initialize(vm, VM_MEM_SRC_ANONYMOUS, 0); + vcpu = td_vcpu_add(vm, 0, guest_ioexit); + td_finalize(vm); + + printf("Verifying TD IO Exit:\n"); + + /* Wait for guest to do a IO write */ + tdx_run(vcpu); + tdx_test_assert_io(vcpu, TDX_IOEXIT_TEST_PORT, 1, PORT_WRITE); + port_data = *(uint8_t *)((void *)vcpu->run + vcpu->run->io.data_offset); + + printf("\t ... IO WRITE: DONE\n"); + + /* + * Wait for the guest to do a IO read. Provide the previous written data + * + 1 back to the guest + */ + tdx_run(vcpu); + tdx_test_assert_io(vcpu, TDX_IOEXIT_TEST_PORT, 1, PORT_READ); + *(uint8_t *)((void *)vcpu->run + vcpu->run->io.data_offset) = port_data + 1; + + printf("\t ... IO READ: DONE\n"); + + /* + * Wait for the guest to complete execution successfully. The read + * value is checked within the guest. + */ + tdx_run(vcpu); tdx_test_assert_success(vcpu);
+ printf("\t ... IO verify read/write values: OK\n"); kvm_vm_free(vm); printf("\t ... PASSED\n"); } @@ -83,11 +153,13 @@ 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(2); + ksft_set_plan(3); 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), "verify_report_fatal_error\n"); + ksft_test_result(!run_in_new_process(&verify_td_ioexit), + "verify_td_ioexit\n");
ksft_finished(); return 0;