16689fb8fSOliver Upton // SPDX-License-Identifier: GPL-2.0-only 26689fb8fSOliver Upton /* 36689fb8fSOliver Upton * psci_cpu_on_test - Test that the observable state of a vCPU targeted by the 46689fb8fSOliver Upton * CPU_ON PSCI call matches what the caller requested. 56689fb8fSOliver Upton * 66689fb8fSOliver Upton * Copyright (c) 2021 Google LLC. 76689fb8fSOliver Upton * 86689fb8fSOliver Upton * This is a regression test for a race between KVM servicing the PSCI call and 96689fb8fSOliver Upton * userspace reading the vCPUs registers. 106689fb8fSOliver Upton */ 116689fb8fSOliver Upton 126689fb8fSOliver Upton #define _GNU_SOURCE 136689fb8fSOliver Upton 146689fb8fSOliver Upton #include <linux/psci.h> 156689fb8fSOliver Upton 166689fb8fSOliver Upton #include "kvm_util.h" 176689fb8fSOliver Upton #include "processor.h" 186689fb8fSOliver Upton #include "test_util.h" 196689fb8fSOliver Upton 206689fb8fSOliver Upton #define VCPU_ID_SOURCE 0 216689fb8fSOliver Upton #define VCPU_ID_TARGET 1 226689fb8fSOliver Upton 236689fb8fSOliver Upton #define CPU_ON_ENTRY_ADDR 0xfeedf00dul 246689fb8fSOliver Upton #define CPU_ON_CONTEXT_ID 0xdeadc0deul 256689fb8fSOliver Upton 266689fb8fSOliver Upton static uint64_t psci_cpu_on(uint64_t target_cpu, uint64_t entry_addr, 276689fb8fSOliver Upton uint64_t context_id) 286689fb8fSOliver Upton { 29694e3dccSOliver Upton struct arm_smccc_res res; 306689fb8fSOliver Upton 31694e3dccSOliver Upton smccc_hvc(PSCI_0_2_FN64_CPU_ON, target_cpu, entry_addr, context_id, 32694e3dccSOliver Upton 0, 0, 0, 0, &res); 336689fb8fSOliver Upton 34694e3dccSOliver Upton return res.a0; 356689fb8fSOliver Upton } 366689fb8fSOliver Upton 376689fb8fSOliver Upton static uint64_t psci_affinity_info(uint64_t target_affinity, 386689fb8fSOliver Upton uint64_t lowest_affinity_level) 396689fb8fSOliver Upton { 40694e3dccSOliver Upton struct arm_smccc_res res; 416689fb8fSOliver Upton 42694e3dccSOliver Upton smccc_hvc(PSCI_0_2_FN64_AFFINITY_INFO, target_affinity, lowest_affinity_level, 43694e3dccSOliver Upton 0, 0, 0, 0, 0, &res); 446689fb8fSOliver Upton 45694e3dccSOliver Upton return res.a0; 466689fb8fSOliver Upton } 476689fb8fSOliver Upton 48*67a36a82SOliver Upton static void vcpu_power_off(struct kvm_vm *vm, uint32_t vcpuid) 496689fb8fSOliver Upton { 50*67a36a82SOliver Upton struct kvm_mp_state mp_state = { 51*67a36a82SOliver Upton .mp_state = KVM_MP_STATE_STOPPED, 52*67a36a82SOliver Upton }; 53*67a36a82SOliver Upton 54*67a36a82SOliver Upton vcpu_set_mp_state(vm, vcpuid, &mp_state); 55*67a36a82SOliver Upton } 56*67a36a82SOliver Upton 57*67a36a82SOliver Upton static struct kvm_vm *setup_vm(void *guest_code) 58*67a36a82SOliver Upton { 59*67a36a82SOliver Upton struct kvm_vcpu_init init; 60*67a36a82SOliver Upton struct kvm_vm *vm; 61*67a36a82SOliver Upton 62*67a36a82SOliver Upton vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR); 63*67a36a82SOliver Upton kvm_vm_elf_load(vm, program_invocation_name); 64*67a36a82SOliver Upton ucall_init(vm, NULL); 65*67a36a82SOliver Upton 66*67a36a82SOliver Upton vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init); 67*67a36a82SOliver Upton init.features[0] |= (1 << KVM_ARM_VCPU_PSCI_0_2); 68*67a36a82SOliver Upton 69*67a36a82SOliver Upton aarch64_vcpu_add_default(vm, VCPU_ID_SOURCE, &init, guest_code); 70*67a36a82SOliver Upton aarch64_vcpu_add_default(vm, VCPU_ID_TARGET, &init, guest_code); 71*67a36a82SOliver Upton 72*67a36a82SOliver Upton return vm; 73*67a36a82SOliver Upton } 74*67a36a82SOliver Upton 75*67a36a82SOliver Upton static void enter_guest(struct kvm_vm *vm, uint32_t vcpuid) 76*67a36a82SOliver Upton { 77*67a36a82SOliver Upton struct ucall uc; 78*67a36a82SOliver Upton 79*67a36a82SOliver Upton vcpu_run(vm, vcpuid); 80*67a36a82SOliver Upton if (get_ucall(vm, vcpuid, &uc) == UCALL_ABORT) 81*67a36a82SOliver Upton TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0], __FILE__, 82*67a36a82SOliver Upton uc.args[1]); 83*67a36a82SOliver Upton } 84*67a36a82SOliver Upton 85*67a36a82SOliver Upton static void assert_vcpu_reset(struct kvm_vm *vm, uint32_t vcpuid) 86*67a36a82SOliver Upton { 87*67a36a82SOliver Upton uint64_t obs_pc, obs_x0; 88*67a36a82SOliver Upton 89*67a36a82SOliver Upton get_reg(vm, vcpuid, ARM64_CORE_REG(regs.pc), &obs_pc); 90*67a36a82SOliver Upton get_reg(vm, vcpuid, ARM64_CORE_REG(regs.regs[0]), &obs_x0); 91*67a36a82SOliver Upton 92*67a36a82SOliver Upton TEST_ASSERT(obs_pc == CPU_ON_ENTRY_ADDR, 93*67a36a82SOliver Upton "unexpected target cpu pc: %lx (expected: %lx)", 94*67a36a82SOliver Upton obs_pc, CPU_ON_ENTRY_ADDR); 95*67a36a82SOliver Upton TEST_ASSERT(obs_x0 == CPU_ON_CONTEXT_ID, 96*67a36a82SOliver Upton "unexpected target context id: %lx (expected: %lx)", 97*67a36a82SOliver Upton obs_x0, CPU_ON_CONTEXT_ID); 98*67a36a82SOliver Upton } 99*67a36a82SOliver Upton 100*67a36a82SOliver Upton static void guest_test_cpu_on(uint64_t target_cpu) 101*67a36a82SOliver Upton { 1026689fb8fSOliver Upton uint64_t target_state; 1036689fb8fSOliver Upton 104*67a36a82SOliver Upton GUEST_ASSERT(!psci_cpu_on(target_cpu, CPU_ON_ENTRY_ADDR, CPU_ON_CONTEXT_ID)); 105*67a36a82SOliver Upton 1066689fb8fSOliver Upton do { 1076689fb8fSOliver Upton target_state = psci_affinity_info(target_cpu, 0); 1086689fb8fSOliver Upton 1096689fb8fSOliver Upton GUEST_ASSERT((target_state == PSCI_0_2_AFFINITY_LEVEL_ON) || 1106689fb8fSOliver Upton (target_state == PSCI_0_2_AFFINITY_LEVEL_OFF)); 1116689fb8fSOliver Upton } while (target_state != PSCI_0_2_AFFINITY_LEVEL_ON); 1126689fb8fSOliver Upton 1136689fb8fSOliver Upton GUEST_DONE(); 1146689fb8fSOliver Upton } 1156689fb8fSOliver Upton 116*67a36a82SOliver Upton static void host_test_cpu_on(void) 117d135399aSOliver Upton { 118*67a36a82SOliver Upton uint64_t target_mpidr; 1196689fb8fSOliver Upton struct kvm_vm *vm; 1206689fb8fSOliver Upton struct ucall uc; 1216689fb8fSOliver Upton 122*67a36a82SOliver Upton vm = setup_vm(guest_test_cpu_on); 1236689fb8fSOliver Upton 1246689fb8fSOliver Upton /* 1256689fb8fSOliver Upton * make sure the target is already off when executing the test. 1266689fb8fSOliver Upton */ 127d135399aSOliver Upton vcpu_power_off(vm, VCPU_ID_TARGET); 1286689fb8fSOliver Upton 1296689fb8fSOliver Upton get_reg(vm, VCPU_ID_TARGET, KVM_ARM64_SYS_REG(SYS_MPIDR_EL1), &target_mpidr); 1306689fb8fSOliver Upton vcpu_args_set(vm, VCPU_ID_SOURCE, 1, target_mpidr & MPIDR_HWID_BITMASK); 131*67a36a82SOliver Upton enter_guest(vm, VCPU_ID_SOURCE); 1326689fb8fSOliver Upton 133*67a36a82SOliver Upton if (get_ucall(vm, VCPU_ID_SOURCE, &uc) != UCALL_DONE) 1346689fb8fSOliver Upton TEST_FAIL("Unhandled ucall: %lu", uc.cmd); 135*67a36a82SOliver Upton 136*67a36a82SOliver Upton assert_vcpu_reset(vm, VCPU_ID_TARGET); 137*67a36a82SOliver Upton kvm_vm_free(vm); 1386689fb8fSOliver Upton } 1396689fb8fSOliver Upton 140*67a36a82SOliver Upton int main(void) 141*67a36a82SOliver Upton { 142*67a36a82SOliver Upton host_test_cpu_on(); 1436689fb8fSOliver Upton return 0; 1446689fb8fSOliver Upton } 145