[PATCH v2 10/11] selftests: KVM: Refactor psci_test to make it amenable to new tests

[Oliver Upton <oupton@xxxxxxxxxx>]

Split up the current test into several helpers that will be useful to
subsequent test cases added to the PSCI test suite.

Signed-off-by: Oliver Upton <oupton@xxxxxxxxxx>
---
 .../testing/selftests/kvm/aarch64/psci_test.c | 68 ++++++++++++-------
 1 file changed, 45 insertions(+), 23 deletions(-)

diff --git a/tools/testing/selftests/kvm/aarch64/psci_test.c b/tools/testing/selftests/kvm/aarch64/psci_test.c
index 8d043e12b137..90312be335da 100644
--- a/tools/testing/selftests/kvm/aarch64/psci_test.c
+++ b/tools/testing/selftests/kvm/aarch64/psci_test.c
@@ -45,7 +45,7 @@ static uint64_t psci_affinity_info(uint64_t target_affinity,
 	return res.a0;
 }
 
-static void guest_main(uint64_t target_cpu)
+static void guest_test_cpu_on(uint64_t target_cpu)
 {
 	GUEST_ASSERT(!psci_cpu_on(target_cpu, CPU_ON_ENTRY_ADDR, CPU_ON_CONTEXT_ID));
 	uint64_t target_state;
@@ -69,12 +69,10 @@ static void vcpu_power_off(struct kvm_vm *vm, uint32_t vcpuid)
 	vcpu_set_mp_state(vm, vcpuid, &mp_state);
 }
 
-int main(void)
+static struct kvm_vm *setup_vm(void *guest_code)
 {
-	uint64_t target_mpidr, obs_pc, obs_x0;
 	struct kvm_vcpu_init init;
 	struct kvm_vm *vm;
-	struct ucall uc;
 
 	vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
 	kvm_vm_elf_load(vm, program_invocation_name);
@@ -83,31 +81,28 @@ int main(void)
 	vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init);
 	init.features[0] |= (1 << KVM_ARM_VCPU_PSCI_0_2);
 
-	aarch64_vcpu_add_default(vm, VCPU_ID_SOURCE, &init, guest_main);
-	aarch64_vcpu_add_default(vm, VCPU_ID_TARGET, &init, guest_main);
+	aarch64_vcpu_add_default(vm, VCPU_ID_SOURCE, &init, guest_code);
+	aarch64_vcpu_add_default(vm, VCPU_ID_TARGET, &init, guest_code);
 
-	/*
-	 * make sure the target is already off when executing the test.
-	 */
-	vcpu_power_off(vm, VCPU_ID_TARGET);
+	return vm;
+}
 
-	get_reg(vm, VCPU_ID_TARGET, ARM64_SYS_REG(MPIDR_EL1), &target_mpidr);
-	vcpu_args_set(vm, VCPU_ID_SOURCE, 1, target_mpidr & MPIDR_HWID_BITMASK);
-	vcpu_run(vm, VCPU_ID_SOURCE);
+static void enter_guest(struct kvm_vm *vm, uint32_t vcpuid)
+{
+	struct ucall uc;
 
-	switch (get_ucall(vm, VCPU_ID_SOURCE, &uc)) {
-	case UCALL_DONE:
-		break;
-	case UCALL_ABORT:
+	vcpu_run(vm, vcpuid);
+	if (get_ucall(vm, vcpuid, &uc) == UCALL_ABORT)
 		TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0], __FILE__,
 			  uc.args[1]);
-		break;
-	default:
-		TEST_FAIL("Unhandled ucall: %lu", uc.cmd);
-	}
+}
 
-	get_reg(vm, VCPU_ID_TARGET, ARM64_CORE_REG(regs.pc), &obs_pc);
-	get_reg(vm, VCPU_ID_TARGET, ARM64_CORE_REG(regs.regs[0]), &obs_x0);
+static void assert_vcpu_reset(struct kvm_vm *vm, uint32_t vcpuid)
+{
+	uint64_t obs_pc, obs_x0;
+
+	get_reg(vm, vcpuid, ARM64_CORE_REG(regs.pc), &obs_pc);
+	get_reg(vm, vcpuid, ARM64_CORE_REG(regs.regs[0]), &obs_x0);
 
 	TEST_ASSERT(obs_pc == CPU_ON_ENTRY_ADDR,
 		    "unexpected target cpu pc: %lx (expected: %lx)",
@@ -115,7 +110,34 @@ int main(void)
 	TEST_ASSERT(obs_x0 == CPU_ON_CONTEXT_ID,
 		    "unexpected target context id: %lx (expected: %lx)",
 		    obs_x0, CPU_ON_CONTEXT_ID);
+}
 
+static void host_test_cpu_on(void)
+{
+	uint64_t target_mpidr;
+	struct kvm_vm *vm;
+	struct ucall uc;
+
+	vm = setup_vm(guest_test_cpu_on);
+
+	/*
+	 * make sure the target is already off when executing the test.
+	 */
+	vcpu_power_off(vm, VCPU_ID_TARGET);
+
+	get_reg(vm, VCPU_ID_TARGET, ARM64_SYS_REG(MPIDR_EL1), &target_mpidr);
+	vcpu_args_set(vm, VCPU_ID_SOURCE, 1, target_mpidr & MPIDR_HWID_BITMASK);
+	enter_guest(vm, VCPU_ID_SOURCE);
+
+	if (get_ucall(vm, VCPU_ID_SOURCE, &uc) != UCALL_DONE)
+		TEST_FAIL("Unhandled ucall: %lu", uc.cmd);
+
+	assert_vcpu_reset(vm, VCPU_ID_TARGET);
 	kvm_vm_free(vm);
+}
+
+int main(void)
+{
+	host_test_cpu_on();
 	return 0;
 }
-- 
2.33.0.685.g46640cef36-goog