[PATCH v8 10/30] KVM: selftests: TDX: Add report_fatal_error test

[Sagi Shahar <sagis@google.com>]

The test checks report_fatal_error functionality.

TD guest can use TDG.VP.VMCALL<ReportFatalError> to report the fatal error
it has experienced. TD guest is requesting a termination with the error
information that include 16 general-purpose registers.

Co-developed-by: Binbin Wu <binbin.wu@linux.intel.com>
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Signed-off-by: Sagi Shahar <sagis@google.com>
---
 .../selftests/kvm/include/x86/tdx/tdx.h       |  6 ++-
 .../selftests/kvm/include/x86/tdx/tdx_util.h  |  1 +
 .../selftests/kvm/include/x86/tdx/test_util.h | 19 +++++++
 tools/testing/selftests/kvm/lib/x86/tdx/tdx.c | 18 +++++++
 .../selftests/kvm/lib/x86/tdx/tdx_util.c      |  6 +++
 .../selftests/kvm/lib/x86/tdx/test_util.c     | 10 ++++
 tools/testing/selftests/kvm/x86/tdx_vm_test.c | 51 ++++++++++++++++++-
 7 files changed, 108 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/x86/tdx/tdx.h b/tools/testing/selftests/kvm/include/x86/tdx/tdx.h
index a7161efe4ee2..2acccc9dccf9 100644
--- a/tools/testing/selftests/kvm/include/x86/tdx/tdx.h
+++ b/tools/testing/selftests/kvm/include/x86/tdx/tdx.h
@@ -4,9 +4,13 @@
 
 #include <stdint.h>
 
+#include "kvm_util.h"
+
+#define TDG_VP_VMCALL_REPORT_FATAL_ERROR 0x10003
+
 #define TDG_VP_VMCALL_INSTRUCTION_IO 30
 
 uint64_t tdg_vp_vmcall_instruction_io(uint64_t port, uint64_t size,
 				      uint64_t write, uint64_t *data);
-
+void tdg_vp_vmcall_report_fatal_error(uint64_t error_code, uint64_t data_gpa);
 #endif // SELFTEST_TDX_TDX_H
diff --git a/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h b/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h
index 57a2f5893ffe..d66cf17f03ea 100644
--- a/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h
+++ b/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h
@@ -15,5 +15,6 @@ struct kvm_vm *td_create(void);
 void td_initialize(struct kvm_vm *vm, enum vm_mem_backing_src_type src_type,
 		   uint64_t attributes);
 void td_finalize(struct kvm_vm *vm);
+void td_vcpu_run(struct kvm_vcpu *vcpu);
 
 #endif // SELFTESTS_TDX_KVM_UTIL_H
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 07d63bf1ffe1..dafeee9af1dc 100644
--- a/tools/testing/selftests/kvm/include/x86/tdx/test_util.h
+++ b/tools/testing/selftests/kvm/include/x86/tdx/test_util.h
@@ -38,4 +38,23 @@ bool is_tdx_enabled(void);
 void tdx_test_success(void);
 void tdx_test_assert_success(struct kvm_vcpu *vcpu);
 
+/*
+ * Report an error with @error_code 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_test_fatal(uint64_t error_code);
+
+/*
+ * Report an error with @error_code to userspace.
+ *
+ * @data_gpa may point to an optional shared guest memory holding the error
+ * string.
+ *
+ * Return value from tdg_vp_vmcall_report_fatal_error() is ignored since
+ * execution is not expected to continue beyond this point.
+ */
+void tdx_test_fatal_with_data(uint64_t error_code, uint64_t data_gpa);
+
 #endif // SELFTEST_TDX_TEST_UTIL_H
diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c b/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c
index f417ee75bee2..ba088bfc1e62 100644
--- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c
+++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c
@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 
+#include <string.h>
+
 #include "tdx/tdcall.h"
 #include "tdx/tdx.h"
 
@@ -25,3 +27,19 @@ uint64_t tdg_vp_vmcall_instruction_io(uint64_t port, uint64_t size,
 
 	return ret;
 }
+
+void tdg_vp_vmcall_report_fatal_error(uint64_t error_code, uint64_t data_gpa)
+{
+	struct tdx_hypercall_args args;
+
+	memset(&args, 0, sizeof(struct tdx_hypercall_args));
+
+	if (data_gpa)
+		error_code |= 0x8000000000000000;
+
+	args.r11 = TDG_VP_VMCALL_REPORT_FATAL_ERROR;
+	args.r12 = error_code;
+	args.r13 = data_gpa;
+
+	__tdx_hypercall(&args, 0);
+}
diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
index e2bf9766dc03..5e4455be828a 100644
--- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
+++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
@@ -9,6 +9,7 @@
 #include "kvm_util.h"
 #include "processor.h"
 #include "tdx/td_boot.h"
+#include "tdx/tdx.h"
 #include "test_util.h"
 
 uint64_t tdx_s_bit;
@@ -603,3 +604,8 @@ void td_finalize(struct kvm_vm *vm)
 
 	tdx_td_finalize_mr(vm);
 }
+
+void td_vcpu_run(struct kvm_vcpu *vcpu)
+{
+	vcpu_run(vcpu);
+}
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 7355b213c344..6c82a0c3bd37 100644
--- a/tools/testing/selftests/kvm/lib/x86/tdx/test_util.c
+++ b/tools/testing/selftests/kvm/lib/x86/tdx/test_util.c
@@ -59,3 +59,13 @@ void tdx_test_assert_success(struct kvm_vcpu *vcpu)
 		    vcpu->run->io.port, vcpu->run->io.size,
 		    vcpu->run->io.direction);
 }
+
+void tdx_test_fatal_with_data(uint64_t error_code, uint64_t data_gpa)
+{
+	tdg_vp_vmcall_report_fatal_error(error_code, data_gpa);
+}
+
+void tdx_test_fatal(uint64_t error_code)
+{
+	tdx_test_fatal_with_data(error_code, 0);
+}
diff --git a/tools/testing/selftests/kvm/x86/tdx_vm_test.c b/tools/testing/selftests/kvm/x86/tdx_vm_test.c
index fdb7c40065a6..7d6d71602761 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/tdx.h"
 #include "tdx/tdx_util.h"
 #include "tdx/test_util.h"
 #include "test_util.h"
@@ -24,7 +25,51 @@ static void verify_td_lifecycle(void)
 
 	printf("Verifying TD lifecycle:\n");
 
-	vcpu_run(vcpu);
+	td_vcpu_run(vcpu);
+	tdx_test_assert_success(vcpu);
+
+	kvm_vm_free(vm);
+	printf("\t ... PASSED\n");
+}
+
+void guest_code_report_fatal_error(void)
+{
+	uint64_t err;
+
+	/*
+	 * Note: err should follow the GHCI spec definition:
+	 * bits 31:0 should be set to 0.
+	 * bits 62:32 are used for TD-specific extended error code.
+	 * bit 63 is used to mark additional information in shared memory.
+	 */
+	err = 0x0BAAAAAD00000000;
+	tdx_test_fatal(err);
+
+	tdx_test_success();
+}
+
+void verify_report_fatal_error(void)
+{
+	struct kvm_vcpu *vcpu;
+	struct kvm_vm *vm;
+
+	vm = td_create();
+	td_initialize(vm, VM_MEM_SRC_ANONYMOUS, 0);
+	vcpu = td_vcpu_add(vm, 0, guest_code_report_fatal_error);
+	td_finalize(vm);
+
+	printf("Verifying report_fatal_error:\n");
+
+	td_vcpu_run(vcpu);
+
+	TEST_ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_SYSTEM_EVENT);
+	TEST_ASSERT_EQ(vcpu->run->system_event.type, KVM_SYSTEM_EVENT_TDX_FATAL);
+	TEST_ASSERT_EQ(vcpu->run->system_event.ndata, 16);
+
+	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_test_assert_success(vcpu);
 
 	kvm_vm_free(vm);
@@ -38,9 +83,11 @@ 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(1);
+	ksft_set_plan(2);
 	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_finished();
 	return 0;
-- 
2.51.0.rc0.155.g4a0f42376b-goog