From: Erdem Aktas erdemaktas@google.com
Verifies TDVMCALL<INSTRUCTION.IO> READ and WRITE operations.
Signed-off-by: Erdem Aktas erdemaktas@google.com Signed-off-by: Sagi Shahar sagis@google.com --- tools/testing/selftests/kvm/lib/x86_64/tdx.h | 1 + .../selftests/kvm/x86_64/tdx_vm_tests.c | 108 ++++++++++++++++++ 2 files changed, 109 insertions(+)
diff --git a/tools/testing/selftests/kvm/lib/x86_64/tdx.h b/tools/testing/selftests/kvm/lib/x86_64/tdx.h index 351ece3e80e2..c78dba1af14f 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/tdx.h +++ b/tools/testing/selftests/kvm/lib/x86_64/tdx.h @@ -55,6 +55,7 @@ #define TDX_INSTRUCTION_IO 30
#define TDX_SUCCESS_PORT 0x30 +#define TDX_TEST_PORT 0x31 #define TDX_IO_READ 0 #define TDX_IO_WRITE 1
diff --git a/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c b/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c index 1db5400ca5ef..a93629cfd13f 100644 --- a/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c +++ b/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c @@ -27,6 +27,32 @@ (VCPU)->run->exit_reason, exit_reason_str((VCPU)->run->exit_reason), \ (VCPU)->run->io.port, (VCPU)->run->io.size, (VCPU)->run->io.direction))
+#define CHECK_IO(VCPU, PORT, SIZE, DIR) \ + do { \ + 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 == (DIR)), \ + "Got an unexpected IO exit values: %u (%s) %d %d %d\n", \ + (VCPU)->run->exit_reason, \ + exit_reason_str((VCPU)->run->exit_reason), \ + (VCPU)->run->io.port, (VCPU)->run->io.size, \ + (VCPU)->run->io.direction); \ + } while (0) + +#define CHECK_GUEST_FAILURE(VCPU) \ + do { \ + 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[1], \ + (VCPU)->run->system_event.data[1]); \ + } while (0) + /* * There might be multiple tests we are running and if one test fails, it will * prevent the subsequent tests to run due to how tests are failing with @@ -145,6 +171,87 @@ void verify_report_fatal_error(void) printf("\t ... PASSED\n"); }
+/* + * 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 + */ +TDX_GUEST_FUNCTION(guest_io_exit) +{ + uint64_t data_out, data_in, delta; + uint64_t ret; + + data_out = 0xAB; + + ret = tdvmcall_io(TDX_TEST_PORT, 1, TDX_IO_WRITE, &data_out); + if (ret) + tdvmcall_fatal(ret); + + ret = tdvmcall_io(TDX_TEST_PORT, 1, TDX_IO_READ, &data_in); + if (ret) + tdvmcall_fatal(ret); + + delta = data_in - data_out; + if (delta != 1) + tdvmcall_fatal(ret); + + tdvmcall_success(); +} + +void verify_td_ioexit(void) +{ + struct kvm_vcpu *vcpu; + uint32_t port_data; + struct kvm_vm *vm; + + printf("Verifying TD IO Exit:\n"); + /* Create a TD VM with no memory.*/ + vm = vm_create_tdx(); + + /* Allocate TD guest memory and initialize the TD.*/ + initialize_td(vm); + + /* Initialize the TD vcpu and copy the test code to the guest memory.*/ + vcpu = vm_vcpu_add_tdx(vm, 0); + + /* Setup and initialize VM memory */ + prepare_source_image(vm, guest_io_exit, + TDX_FUNCTION_SIZE(guest_io_exit), 0); + finalize_td_memory(vm); + + /* Wait for guest to do a IO write */ + vcpu_run(vcpu); + CHECK_GUEST_FAILURE(vcpu); + CHECK_IO(vcpu, TDX_TEST_PORT, 1, TDX_IO_WRITE); + port_data = *(uint8_t *)((void *)vcpu->run + vcpu->run->io.data_offset); + + printf("\t ... IO WRITE: OK\n"); + + /* + * Wait for the guest to do a IO read. Provide the previos written data + * + 1 back to the guest + */ + vcpu_run(vcpu); + CHECK_GUEST_FAILURE(vcpu); + CHECK_IO(vcpu, TDX_TEST_PORT, 1, TDX_IO_READ); + *(uint8_t *)((void *)vcpu->run + vcpu->run->io.data_offset) = port_data + 1; + + printf("\t ... IO READ: OK\n"); + + /* + * Wait for the guest to complete execution successfully. The read + * value is checked within the guest. + */ + vcpu_run(vcpu); + CHECK_GUEST_FAILURE(vcpu); + CHECK_GUEST_COMPLETION(vcpu); + + printf("\t ... IO verify read/write values: OK\n"); + kvm_vm_free(vm); + printf("\t ... PASSED\n"); +} + + int main(int argc, char **argv) { if (!is_tdx_enabled()) { @@ -154,6 +261,7 @@ int main(int argc, char **argv)
run_in_new_process(&verify_td_lifecycle); run_in_new_process(&verify_report_fatal_error); + run_in_new_process(&verify_td_ioexit);
return 0; }