122 lines
3.2 KiB
C
122 lines
3.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* psci_cpu_on_test - Test that the observable state of a vCPU targeted by the
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* CPU_ON PSCI call matches what the caller requested.
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*
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* Copyright (c) 2021 Google LLC.
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*
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* This is a regression test for a race between KVM servicing the PSCI call and
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* userspace reading the vCPUs registers.
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*/
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#define _GNU_SOURCE
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#include <linux/psci.h>
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#include "kvm_util.h"
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#include "processor.h"
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#include "test_util.h"
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#define VCPU_ID_SOURCE 0
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#define VCPU_ID_TARGET 1
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#define CPU_ON_ENTRY_ADDR 0xfeedf00dul
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#define CPU_ON_CONTEXT_ID 0xdeadc0deul
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static uint64_t psci_cpu_on(uint64_t target_cpu, uint64_t entry_addr,
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uint64_t context_id)
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{
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register uint64_t x0 asm("x0") = PSCI_0_2_FN64_CPU_ON;
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register uint64_t x1 asm("x1") = target_cpu;
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register uint64_t x2 asm("x2") = entry_addr;
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register uint64_t x3 asm("x3") = context_id;
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asm("hvc #0"
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: "=r"(x0)
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: "r"(x0), "r"(x1), "r"(x2), "r"(x3)
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: "memory");
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return x0;
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}
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static uint64_t psci_affinity_info(uint64_t target_affinity,
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uint64_t lowest_affinity_level)
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{
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register uint64_t x0 asm("x0") = PSCI_0_2_FN64_AFFINITY_INFO;
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register uint64_t x1 asm("x1") = target_affinity;
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register uint64_t x2 asm("x2") = lowest_affinity_level;
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asm("hvc #0"
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: "=r"(x0)
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: "r"(x0), "r"(x1), "r"(x2)
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: "memory");
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return x0;
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}
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static void guest_main(uint64_t target_cpu)
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{
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GUEST_ASSERT(!psci_cpu_on(target_cpu, CPU_ON_ENTRY_ADDR, CPU_ON_CONTEXT_ID));
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uint64_t target_state;
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do {
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target_state = psci_affinity_info(target_cpu, 0);
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GUEST_ASSERT((target_state == PSCI_0_2_AFFINITY_LEVEL_ON) ||
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(target_state == PSCI_0_2_AFFINITY_LEVEL_OFF));
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} while (target_state != PSCI_0_2_AFFINITY_LEVEL_ON);
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GUEST_DONE();
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}
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int main(void)
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{
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uint64_t target_mpidr, obs_pc, obs_x0;
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struct kvm_vcpu_init init;
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struct kvm_vm *vm;
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struct ucall uc;
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vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
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kvm_vm_elf_load(vm, program_invocation_name);
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ucall_init(vm, NULL);
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vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init);
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init.features[0] |= (1 << KVM_ARM_VCPU_PSCI_0_2);
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aarch64_vcpu_add_default(vm, VCPU_ID_SOURCE, &init, guest_main);
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/*
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* make sure the target is already off when executing the test.
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*/
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init.features[0] |= (1 << KVM_ARM_VCPU_POWER_OFF);
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aarch64_vcpu_add_default(vm, VCPU_ID_TARGET, &init, guest_main);
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get_reg(vm, VCPU_ID_TARGET, ARM64_SYS_REG(MPIDR_EL1), &target_mpidr);
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vcpu_args_set(vm, VCPU_ID_SOURCE, 1, target_mpidr & MPIDR_HWID_BITMASK);
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vcpu_run(vm, VCPU_ID_SOURCE);
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switch (get_ucall(vm, VCPU_ID_SOURCE, &uc)) {
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case UCALL_DONE:
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break;
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case UCALL_ABORT:
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TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0], __FILE__,
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uc.args[1]);
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break;
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default:
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TEST_FAIL("Unhandled ucall: %lu", uc.cmd);
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}
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get_reg(vm, VCPU_ID_TARGET, ARM64_CORE_REG(regs.pc), &obs_pc);
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get_reg(vm, VCPU_ID_TARGET, ARM64_CORE_REG(regs.regs[0]), &obs_x0);
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TEST_ASSERT(obs_pc == CPU_ON_ENTRY_ADDR,
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"unexpected target cpu pc: %lx (expected: %lx)",
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obs_pc, CPU_ON_ENTRY_ADDR);
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TEST_ASSERT(obs_x0 == CPU_ON_CONTEXT_ID,
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"unexpected target context id: %lx (expected: %lx)",
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obs_x0, CPU_ON_CONTEXT_ID);
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kvm_vm_free(vm);
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return 0;
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}
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