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    Subject[RFC PATCH v2 05/17] KVM: selftest: Adding test case for TDX port IO
    From
    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;
    }
    --
    2.37.2.789.g6183377224-goog
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