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RISC-V: KVM: selftests: Add ebreak test support

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Initial support for RISC-V KVM ebreak test. Check the exit reason and
the PC when guest debug is enabled. Also to make sure the guest could
handle the ebreak exception without exiting to the VMM when guest debug
is not enabled.

Signed-off-by: Chao Du <duchao@eswincomputing.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20240402062628.5425-4-duchao@eswincomputing.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Chao Du 2024-04-02 06:26:28 +00:00 committed by Anup Patel
parent 1df1fb521b
commit f1c48c1ec7
2 changed files with 83 additions and 0 deletions
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1
tools/testing/selftests/kvm/Makefile
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@ -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/ebreak_test
TEST_GEN_PROGS_riscv += arch_timer
TEST_GEN_PROGS_riscv += demand_paging_test
TEST_GEN_PROGS_riscv += dirty_log_test

82
tools/testing/selftests/kvm/riscv/ebreak_test.c Normal file
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@ -0,0 +1,82 @@
// 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;
}