[PATCH v1 3/3] RISC-V: KVM: selftests: Add breakpoints test support

[Chao Du]

Initial support for RISC-V KVM breakpoint test. Check the exit reason
and the PC when guest debug is enabled.

Signed-off-by: Chao Du <duchao at eswincomputing.com>
---
 tools/testing/selftests/kvm/Makefile          |  1 +
 .../testing/selftests/kvm/riscv/breakpoints.c | 49 +++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/riscv/breakpoints.c

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 492e937fab00..5f9048a740b0 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -184,6 +184,7 @@ 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/breakpoints
 TEST_GEN_PROGS_riscv += demand_paging_test
 TEST_GEN_PROGS_riscv += dirty_log_test
 TEST_GEN_PROGS_riscv += get-reg-list
diff --git a/tools/testing/selftests/kvm/riscv/breakpoints.c b/tools/testing/selftests/kvm/riscv/breakpoints.c
new file mode 100644
index 000000000000..8ca09a493460
--- /dev/null
+++ b/tools/testing/selftests/kvm/riscv/breakpoints.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RISC-V KVM breakpoint tests.
+ *
+ * Copyright 2024 Beijing ESWIN Computing Technology Co., Ltd.
+ *
+ */
+#include "kvm_util.h"
+
+#define PC(v) ((uint64_t)&(v))
+
+extern unsigned char sw_bp;
+
+static void guest_code(void)
+{
+	asm volatile("sw_bp: ebreak");
+	asm volatile("nop");
+	asm volatile("nop");
+	asm volatile("nop");
+
+	GUEST_DONE();
+}
+
+int main(void)
+{
+	struct kvm_vm *vm;
+	struct kvm_vcpu *vcpu;
+	struct kvm_guest_debug debug;
+	uint64_t pc;
+
+	TEST_REQUIRE(kvm_has_cap(KVM_CAP_SET_GUEST_DEBUG));
+
+	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+
+	memset(&debug, 0, sizeof(debug));
+	debug.control = KVM_GUESTDBG_ENABLE;
+	vcpu_guest_debug_set(vcpu, &debug);
+	vcpu_run(vcpu);
+
+	TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_DEBUG);
+
+	vcpu_get_reg(vcpu, RISCV_CORE_REG(regs.pc), &pc);
+
+	TEST_ASSERT_EQ(pc, PC(sw_bp));
+
+	kvm_vm_free(vm);
+
+	return 0;
+}
--
2.17.1