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selftests: KVM: Test SYSTEM_SUSPEND PSCI call 

Assert that the vCPU exits to userspace with KVM_SYSTEM_EVENT_SUSPEND if
the guest calls PSCI SYSTEM_SUSPEND. Additionally, guarantee that the
SMC32 and SMC64 flavors of this call are discoverable with the
PSCI_FEATURES call.

Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220504032446.4133305-13-oupton@google.com
This commit is contained in:
Oliver Upton 2022-05-04 03:24:46 +00:00 committed by Marc Zyngier
parent 67a36a8213
commit b26dafc8a9
1 changed files with 69 additions and 0 deletions
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69
tools/testing/selftests/kvm/aarch64/psci_test.c
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@ -45,6 +45,25 @@ 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 uint64_t psci_features(uint32_t func_id)
{
struct arm_smccc_res res;
smccc_hvc(PSCI_1_0_FN_PSCI_FEATURES, func_id, 0, 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 +156,58 @@ 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 ret;
/* assert that SYSTEM_SUSPEND is discoverable */
GUEST_ASSERT(!psci_features(PSCI_1_0_FN_SYSTEM_SUSPEND));
GUEST_ASSERT(!psci_features(PSCI_1_0_FN64_SYSTEM_SUSPEND));
ret = psci_system_suspend(CPU_ON_ENTRY_ADDR, CPU_ON_CONTEXT_ID);
GUEST_SYNC(ret);
}
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);
}
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();
return 0;
}