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Return a uint64_t from vcpu_get_reg() instead of having the caller provide a pointer to storage, as none of the vcpu_get_reg() usage in KVM selftests accesses a register larger than 64 bits, and vcpu_set_reg() only accepts a 64-bit value. If a use case comes along that needs to get a register that is larger than 64 bits, then a utility can be added to assert success and take a void pointer, but until then, forcing an out param yields ugly code and prevents feeding the output of vcpu_get_reg() into vcpu_set_reg(). Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Link: https://lore.kernel.org/r/20241128005547.4077116-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* RISC-V KVM ebreak test.
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*
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* Copyright 2024 Beijing ESWIN Computing Technology Co., Ltd.
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*
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*/
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#include "kvm_util.h"
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#include "ucall_common.h"
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#define LABEL_ADDRESS(v) ((uint64_t)&(v))
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extern unsigned char sw_bp_1, sw_bp_2;
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static uint64_t sw_bp_addr;
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static void guest_code(void)
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{
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asm volatile(
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".option push\n"
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".option norvc\n"
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"sw_bp_1: ebreak\n"
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"sw_bp_2: ebreak\n"
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".option pop\n"
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);
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GUEST_ASSERT_EQ(READ_ONCE(sw_bp_addr), LABEL_ADDRESS(sw_bp_2));
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GUEST_DONE();
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}
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static void guest_breakpoint_handler(struct ex_regs *regs)
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{
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WRITE_ONCE(sw_bp_addr, regs->epc);
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regs->epc += 4;
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}
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int main(void)
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{
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struct kvm_vm *vm;
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struct kvm_vcpu *vcpu;
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uint64_t pc;
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struct kvm_guest_debug debug = {
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.control = KVM_GUESTDBG_ENABLE,
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};
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TEST_REQUIRE(kvm_has_cap(KVM_CAP_SET_GUEST_DEBUG));
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vm = vm_create_with_one_vcpu(&vcpu, guest_code);
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vm_init_vector_tables(vm);
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vcpu_init_vector_tables(vcpu);
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vm_install_exception_handler(vm, EXC_BREAKPOINT,
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guest_breakpoint_handler);
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/*
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* Enable the guest debug.
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* ebreak should exit to the VMM with KVM_EXIT_DEBUG reason.
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*/
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vcpu_guest_debug_set(vcpu, &debug);
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vcpu_run(vcpu);
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TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_DEBUG);
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pc = vcpu_get_reg(vcpu, RISCV_CORE_REG(regs.pc));
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TEST_ASSERT_EQ(pc, LABEL_ADDRESS(sw_bp_1));
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/* skip sw_bp_1 */
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vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.pc), pc + 4);
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/*
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* Disable all debug controls.
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* Guest should handle the ebreak without exiting to the VMM.
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*/
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memset(&debug, 0, sizeof(debug));
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vcpu_guest_debug_set(vcpu, &debug);
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vcpu_run(vcpu);
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TEST_ASSERT_EQ(get_ucall(vcpu, NULL), UCALL_DONE);
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kvm_vm_free(vm);
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return 0;
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}
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