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// SPDX-License-Identifier: GPL-2.0
/*
* RISC-V KVM ebreak test.
*
* Copyright 2024 Beijing ESWIN Computing Technology Co., Ltd.
*
*/
#include "kvm_util.h"
#define LABEL_ADDRESS(v) ((uint64_t)&(v))
extern unsigned char sw_bp_1, sw_bp_2;
static uint64_t sw_bp_addr;
static void guest_code(void)
{
asm volatile(
".option push\n"
".option norvc\n"
"sw_bp_1: ebreak\n"
"sw_bp_2: ebreak\n"
".option pop\n"
);
GUEST_ASSERT_EQ(READ_ONCE(sw_bp_addr), LABEL_ADDRESS(sw_bp_2));
GUEST_DONE();
}
static void guest_breakpoint_handler(struct ex_regs *regs)
{
WRITE_ONCE(sw_bp_addr, regs->epc);
regs->epc += 4;
}
int main(void)
{
struct kvm_vm *vm;
struct kvm_vcpu *vcpu;
uint64_t pc;
struct kvm_guest_debug debug = {
.control = KVM_GUESTDBG_ENABLE,
};
TEST_REQUIRE(kvm_has_cap(KVM_CAP_SET_GUEST_DEBUG));
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
vm_init_vector_tables(vm);
vcpu_init_vector_tables(vcpu);
vm_install_exception_handler(vm, EXC_BREAKPOINT,
guest_breakpoint_handler);
/*
* Enable the guest debug.
* ebreak should exit to the VMM with KVM_EXIT_DEBUG reason.
*/
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, LABEL_ADDRESS(sw_bp_1));
/* skip sw_bp_1 */
vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.pc), pc + 4);
/*
* Disable all debug controls.
* Guest should handle the ebreak without exiting to the VMM.
*/
memset(&debug, 0, sizeof(debug));
vcpu_guest_debug_set(vcpu, &debug);
vcpu_run(vcpu);
TEST_ASSERT_EQ(get_ucall(vcpu, NULL), UCALL_DONE);
kvm_vm_free(vm);
return 0;
}
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