1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * RISC-V KVM ebreak test.
4 *
5 * Copyright 2024 Beijing ESWIN Computing Technology Co., Ltd.
6 *
7 */
8 #include "kvm_util.h"
9 #include "ucall_common.h"
10
11 #define LABEL_ADDRESS(v) ((uint64_t)&(v))
12
13 extern unsigned char sw_bp_1, sw_bp_2;
14 static uint64_t sw_bp_addr;
15
16 static void guest_code(void)
17 {
18 asm volatile(
19 ".option push\n"
20 ".option norvc\n"
21 "sw_bp_1: ebreak\n"
22 "sw_bp_2: ebreak\n"
23 ".option pop\n"
24 );
25 GUEST_ASSERT_EQ(READ_ONCE(sw_bp_addr), LABEL_ADDRESS(sw_bp_2));
26
27 GUEST_DONE();
28 }
29
30 static void guest_breakpoint_handler(struct ex_regs *regs)
31 {
32 WRITE_ONCE(sw_bp_addr, regs->epc);
33 regs->epc += 4;
34 }
35
36 int main(void)
37 {
38 struct kvm_vm *vm;
39 struct kvm_vcpu *vcpu;
40 uint64_t pc;
41 struct kvm_guest_debug debug = {
42 .control = KVM_GUESTDBG_ENABLE,
43 };
44
45 TEST_REQUIRE(kvm_has_cap(KVM_CAP_SET_GUEST_DEBUG));
46
47 vm = vm_create_with_one_vcpu(&vcpu, guest_code);
48
49 vm_init_vector_tables(vm);
50 vcpu_init_vector_tables(vcpu);
51 vm_install_exception_handler(vm, EXC_BREAKPOINT,
52 guest_breakpoint_handler);
53
54 /*
55 * Enable the guest debug.
56 * ebreak should exit to the VMM with KVM_EXIT_DEBUG reason.
57 */
58 vcpu_guest_debug_set(vcpu, &debug);
59 vcpu_run(vcpu);
60
61 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_DEBUG);
62
63 vcpu_get_reg(vcpu, RISCV_CORE_REG(regs.pc), &pc);
64 TEST_ASSERT_EQ(pc, LABEL_ADDRESS(sw_bp_1));
65
66 /* skip sw_bp_1 */
67 vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.pc), pc + 4);
68
69 /*
70 * Disable all debug controls.
71 * Guest should handle the ebreak without exiting to the VMM.
72 */
73 memset(&debug, 0, sizeof(debug));
74 vcpu_guest_debug_set(vcpu, &debug);
75
76 vcpu_run(vcpu);
77
78 TEST_ASSERT_EQ(get_ucall(vcpu, NULL), UCALL_DONE);
79
80 kvm_vm_free(vm);
81
82 return 0;
83 }
84
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