Verifies TDVMCALL<INSTRUCTION.IO> READ and WRITE operations.
Signed-off-by: Erdem Aktas erdemaktas@google.com Reviewed-by: Sean Christopherson seanjc@google.com Reviewed-by: Peter Gonda pgonda@google.com Reviewed-by: Marc Orr marcorr@google.com Reviewed-by: Sagi Shahar sagis@google.com --- .../selftests/kvm/x86_64/tdx_vm_tests.c | 107 ++++++++++++++++++ 1 file changed, 107 insertions(+)
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 da7ea67b1..7b0b4b378 100644 --- a/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c +++ b/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c @@ -88,6 +88,112 @@ void verify_td_lifecycle(void) kvm_vm_free(vm); 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; + + data_out = 0xAB; + tdvmcall_io(TDX_TEST_PORT, 1, 1, &data_out); + tdvmcall_io(TDX_TEST_PORT, 1, 0, &data_in); + delta = data_in - data_out - 1; + tdvmcall_io(TDX_TEST_PORT, 1, 1, &delta); +} + +void verify_td_ioexit(void) +{ + struct kvm_vm *vm; + struct kvm_run *run; + uint32_t port_data; + + printf("Verifying TD IO Exit:\n"); + /* Create a TD VM with no memory.*/ + vm = __vm_create(VM_MODE_DEFAULT, 0, O_RDWR, KVM_X86_TDX_VM); + + /* Allocate TD guest memory and initialize the TD.*/ + initialize_td(vm); + + /* Initialize the TD vcpu and copy the test code to the guest memory.*/ + 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); + + run = vcpu_state(vm, 0); + + /* Wait for guest to do a IO write */ + vcpu_run(vm, 0); + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, + "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n", + run->exit_reason, + exit_reason_str(run->exit_reason)); + + TEST_ASSERT((run->exit_reason == KVM_EXIT_IO) + && (run->io.port == TDX_TEST_PORT) + && (run->io.size == 1) + && (run->io.direction == 1), + "Got an unexpected IO exit values: %u (%s) %d %d %d\n", + run->exit_reason, + exit_reason_str(run->exit_reason), + run->io.port, run->io.size, run->io.direction); + port_data = *(uint8_t *)((void *)run + 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(vm, 0); + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, + "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n", + run->exit_reason, + exit_reason_str(run->exit_reason)); + + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO && + run->io.port == TDX_TEST_PORT && + run->io.size == 1 && + run->io.direction == 0, + "Got an unexpected IO exit values: %u (%s) %d %d %d\n", + run->exit_reason, + exit_reason_str(run->exit_reason), + run->io.port, run->io.size, run->io.direction); + *(uint8_t *)((void *)run + run->io.data_offset) = port_data + 1; + + printf("\t ... IO READ: OK\n"); + /* + * Wait for the guest to do a IO write to the TDX_TEST_PORT with the + * value of 0. Any value other than 0 means, the guest has not able to + * read/write values correctly. + */ + vcpu_run(vm, 0); + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, + "KVM_EXIT_IO is expected but got an exit_reason: %u (%s)\n", + run->exit_reason, + exit_reason_str(run->exit_reason)); + + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO && + run->io.port == TDX_TEST_PORT && + run->io.size == 1 && + run->io.direction == 1 && + *(uint32_t *)((void *)run + run->io.data_offset) == 0, + "Got an unexpected IO exit values: %u (%s) %d %d %d %d\n", + run->exit_reason, + exit_reason_str(run->exit_reason), + run->io.port, run->io.size, run->io.direction, + *(uint32_t *)((void *)run + run->io.data_offset)); + + 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()) { @@ -97,6 +203,7 @@ int main(int argc, char **argv) }
run_in_new_process(&verify_td_lifecycle); + run_in_new_process(&verify_td_ioexit);
return 0; }