[PATCH v3 19/19] selftests: KVM: Test SYSTEM_SUSPEND PSCI call

[Oliver Upton <oupton@google.com>]

Assert that the vCPU exits to userspace with KVM_SYSTEM_EVENT_SUSPEND if
it correctly executes the SYSTEM_SUSPEND PSCI call. Additionally, assert
that the guest PSCI call fails if preconditions are not met (more than 1
running vCPU).

Signed-off-by: Oliver Upton <oupton@google.com>
---
 .../testing/selftests/kvm/aarch64/psci_test.c | 74 +++++++++++++++++++
 1 file changed, 74 insertions(+)

diff --git a/tools/testing/selftests/kvm/aarch64/psci_test.c b/tools/testing/selftests/kvm/aarch64/psci_test.c
index 535130d5e97f..ef7fd58af675 100644
--- a/tools/testing/selftests/kvm/aarch64/psci_test.c
+++ b/tools/testing/selftests/kvm/aarch64/psci_test.c
@@ -45,6 +45,16 @@ static uint64_t psci_affinity_info(uint64_t target_affinity,
 	return res.a0;
 }
 
+static uint64_t psci_system_suspend(uint64_t entry_addr, uint64_t context_id)
+{
+	struct arm_smccc_res res;
+
+	smccc_hvc(PSCI_1_0_FN64_SYSTEM_SUSPEND, entry_addr, context_id,
+		  0, 0, 0, 0, 0, &res);
+
+	return res.a0;
+}
+
 static void vcpu_power_off(struct kvm_vm *vm, uint32_t vcpuid)
 {
 	struct kvm_mp_state mp_state = {
@@ -137,8 +147,72 @@ static void host_test_cpu_on(void)
 	kvm_vm_free(vm);
 }
 
+static void enable_system_suspend(struct kvm_vm *vm)
+{
+	struct kvm_enable_cap cap = {
+		.cap = KVM_CAP_ARM_SYSTEM_SUSPEND,
+	};
+
+	vm_enable_cap(vm, &cap);
+}
+
+static void guest_test_system_suspend(void)
+{
+	uint64_t r = psci_system_suspend(CPU_ON_ENTRY_ADDR, CPU_ON_CONTEXT_ID);
+
+	GUEST_SYNC(r);
+}
+
+static void host_test_system_suspend(void)
+{
+	struct kvm_run *run;
+	struct kvm_vm *vm;
+
+	vm = setup_vm(guest_test_system_suspend);
+	enable_system_suspend(vm);
+
+	vcpu_power_off(vm, VCPU_ID_TARGET);
+	run = vcpu_state(vm, VCPU_ID_SOURCE);
+
+	enter_guest(vm, VCPU_ID_SOURCE);
+
+	TEST_ASSERT(run->exit_reason == KVM_EXIT_SYSTEM_EVENT,
+		    "Unhandled exit reason: %u (%s)",
+		    run->exit_reason, exit_reason_str(run->exit_reason));
+	TEST_ASSERT(run->system_event.type == KVM_SYSTEM_EVENT_SUSPEND,
+		    "Unhandled system event: %u (expected: %u)",
+		    run->system_event.type, KVM_SYSTEM_EVENT_SUSPEND);
+
+	kvm_vm_free(vm);
+}
+
+static void host_test_system_suspend_fails(void)
+{
+	struct kvm_vm *vm;
+	struct ucall uc;
+
+	vm = setup_vm(guest_test_system_suspend);
+	enable_system_suspend(vm);
+
+	enter_guest(vm, VCPU_ID_SOURCE);
+	TEST_ASSERT(get_ucall(vm, VCPU_ID_SOURCE, &uc) == UCALL_SYNC,
+		    "Unhandled ucall: %lu", uc.cmd);
+	TEST_ASSERT(uc.args[1] == PSCI_RET_DENIED,
+		    "Unrecognized PSCI return code: %lu (expected: %u)",
+		    uc.args[1], PSCI_RET_DENIED);
+
+	kvm_vm_free(vm);
+}
+
 int main(void)
 {
+	if (!kvm_check_cap(KVM_CAP_ARM_SYSTEM_SUSPEND)) {
+		print_skip("KVM_CAP_ARM_SYSTEM_SUSPEND not supported");
+		exit(KSFT_SKIP);
+	}
+
 	host_test_cpu_on();
+	host_test_system_suspend();
+	host_test_system_suspend_fails();
 	return 0;
 }
-- 
2.35.1.473.g83b2b277ed-goog