[PATCH] KVM: riscv: selftests: Add SBI base extension test

[Haibo Xu <haibo1.xu@intel.com>]

This is the first patch to enable the base extension selftest
for the SBI implementation in KVM. Test for other extensions
will be added later.

Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
---
 tools/testing/selftests/kvm/Makefile          |  1 +
 .../selftests/kvm/include/riscv/processor.h   |  8 +-
 tools/testing/selftests/kvm/riscv/sbi_test.c  | 95 +++++++++++++++++++
 3 files changed, 103 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/kvm/riscv/sbi_test.c

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 741c7dc16afc..a6acbbcad757 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -189,6 +189,7 @@ TEST_GEN_PROGS_s390x += rseq_test
 TEST_GEN_PROGS_s390x += set_memory_region_test
 TEST_GEN_PROGS_s390x += kvm_binary_stats_test
 
+TEST_GEN_PROGS_riscv += riscv/sbi_test
 TEST_GEN_PROGS_riscv += arch_timer
 TEST_GEN_PROGS_riscv += demand_paging_test
 TEST_GEN_PROGS_riscv += dirty_log_test
diff --git a/tools/testing/selftests/kvm/include/riscv/processor.h b/tools/testing/selftests/kvm/include/riscv/processor.h
index ce473fe251dd..df530ac751c4 100644
--- a/tools/testing/selftests/kvm/include/riscv/processor.h
+++ b/tools/testing/selftests/kvm/include/riscv/processor.h
@@ -178,7 +178,13 @@ enum sbi_ext_id {
 };
 
 enum sbi_ext_base_fid {
-	SBI_EXT_BASE_PROBE_EXT = 3,
+	SBI_EXT_BASE_GET_SPEC_VERSION = 0,
+	SBI_EXT_BASE_GET_IMP_ID,
+	SBI_EXT_BASE_GET_IMP_VERSION,
+	SBI_EXT_BASE_PROBE_EXT,
+	SBI_EXT_BASE_GET_MVENDORID,
+	SBI_EXT_BASE_GET_MARCHID,
+	SBI_EXT_BASE_GET_MIMPID,
 };
 
 struct sbiret {
diff --git a/tools/testing/selftests/kvm/riscv/sbi_test.c b/tools/testing/selftests/kvm/riscv/sbi_test.c
new file mode 100644
index 000000000000..b9378546e3b6
--- /dev/null
+++ b/tools/testing/selftests/kvm/riscv/sbi_test.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sbi_test - SBI API test for KVM's SBI implementation.
+ *
+ * Copyright (c) 2024 Intel Corporation
+ *
+ * Test cover the following SBI extentions:
+ *  - Base: All functions in this extension should be supported
+ */
+
+#include "kvm_util.h"
+#include "processor.h"
+#include "test_util.h"
+
+/*
+ * Test that all functions in the base extension must be supported
+ */
+static void base_ext_guest_code(void)
+{
+	struct sbiret ret;
+
+	/*
+	 * Since the base extension was introduced in SBI Spec v0.2,
+	 * assert if the implemented SBI version is below 0.2.
+	 */
+	ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_SPEC_VERSION, 0,
+			0, 0, 0, 0, 0);
+	__GUEST_ASSERT(!ret.error && ret.value >= 2, "Get Spec Version Error: ret.error=%ld, "
+			"ret.value=%ld\n", ret.error, ret.value);
+
+	ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_IMP_ID, 0,
+			0, 0, 0, 0, 0);
+	__GUEST_ASSERT(!ret.error && ret.value == 3, "Get Imp ID Error: ret.error=%ld, "
+			"ret.value=%ld\n",
+			ret.error, ret.value);
+
+	ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_IMP_VERSION, 0,
+			0, 0, 0, 0, 0);
+	__GUEST_ASSERT(!ret.error, "Get Imp Version Error: ret.error=%ld\n", ret.error);
+
+	ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, SBI_EXT_BASE,
+			0, 0, 0, 0, 0);
+	__GUEST_ASSERT(!ret.error && ret.value == 1, "Probe ext Error: ret.error=%ld, "
+			"ret.value=%ld\n",
+			ret.error, ret.value);
+
+	ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MVENDORID, 0,
+			0, 0, 0, 0, 0);
+	__GUEST_ASSERT(!ret.error, "Get Machine Vendor ID Error: ret.error=%ld\n", ret.error);
+
+	ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MARCHID, 0,
+			0, 0, 0, 0, 0);
+	__GUEST_ASSERT(!ret.error, "Get Machine Arch ID Error: ret.error=%ld\n", ret.error);
+
+	ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_MIMPID, 0,
+			0, 0, 0, 0, 0);
+	__GUEST_ASSERT(!ret.error, "Get Machine Imp ID Error: ret.error=%ld\n", ret.error);
+
+	GUEST_DONE();
+}
+
+static void sbi_base_ext_test(void)
+{
+	struct kvm_vm *vm;
+	struct kvm_vcpu *vcpu;
+	struct ucall uc;
+
+	vm = vm_create_with_one_vcpu(&vcpu, base_ext_guest_code);
+	while (1) {
+		vcpu_run(vcpu);
+		TEST_ASSERT(vcpu->run->exit_reason == UCALL_EXIT_REASON,
+			    "Unexpected exit reason: %u (%s),",
+			    vcpu->run->exit_reason, exit_reason_str(vcpu->run->exit_reason));
+
+		switch (get_ucall(vcpu, &uc)) {
+		case UCALL_DONE:
+			goto done;
+		case UCALL_ABORT:
+			fprintf(stderr, "Guest assert failed!\n");
+			REPORT_GUEST_ASSERT(uc);
+		default:
+			TEST_FAIL("Unexpected ucall %lu", uc.cmd);
+		}
+	}
+
+done:
+	kvm_vm_free(vm);
+}
+
+int main(void)
+{
+	sbi_base_ext_test();
+
+	return 0;
+}
-- 
2.34.1