Test KVM's newly-added support for the SYSTEM_SUSPEND PSCI call. Since
it is ABI that the vCPUs remain runnable after a system exit (i.e. a VMM
can blissfully ignore this exit), assert that the exiting vCPU is reset
at the requested entrypoint.
Signed-off-by: Oliver Upton <oupton@xxxxxxxxxx>
---
.../selftests/kvm/aarch64/psci_cpu_on_test.c | 110 +++++++++++++-----
1 file changed, 84 insertions(+), 26 deletions(-)
diff --git a/tools/testing/selftests/kvm/aarch64/psci_cpu_on_test.c b/tools/testing/selftests/kvm/aarch64/psci_cpu_on_test.c
index 9c22374fc0f5..b08b006cc4b4 100644
--- a/tools/testing/selftests/kvm/aarch64/psci_cpu_on_test.c
+++ b/tools/testing/selftests/kvm/aarch64/psci_cpu_on_test.c
@@ -54,7 +54,21 @@ static uint64_t psci_affinity_info(uint64_t target_affinity,
return x0;
}
-static void guest_main(uint64_t target_cpu)
+static uint64_t psci_system_suspend(uint64_t entry_addr, uint64_t context_id)
+{
+ register uint64_t x0 asm("x0") = PSCI_1_0_FN64_SYSTEM_SUSPEND;
+ register uint64_t x1 asm("x1") = entry_addr;
+ register uint64_t x2 asm("x2") = context_id;
+
+ asm volatile("hvc #0"
+ : "=r"(x0)
+ : "r"(x0), "r"(x1), "r"(x2)
+ : "memory");
+
+ return x0;
+}
+
+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;
@@ -69,52 +83,96 @@ static void guest_main(uint64_t target_cpu)
GUEST_DONE();
}
+static void guest_test_system_suspend(uint64_t target_cpu)
+{
+ psci_system_suspend(CPU_ON_ENTRY_ADDR, CPU_ON_CONTEXT_ID);
+
+ /* should never be reached */
+ GUEST_ASSERT(0);
+}
+
+static void guest_main(uint64_t target_cpu)
+{
+ guest_test_cpu_on(target_cpu);
+ guest_test_system_suspend(target_cpu);
+}
+
int main(void)
{
+ struct kvm_mp_state target_mp_state = { .mp_state = KVM_MP_STATE_STOPPED };
uint64_t target_mpidr, obs_pc, obs_x0;
+ struct kvm_enable_cap cap = {0};
+ uint32_t vcpu_to_test = -1;
struct kvm_vcpu_init init;
struct kvm_vm *vm;
struct ucall uc;
+ int i;
+
+ if (!kvm_check_cap(KVM_CAP_ARM_SYSTEM_SUSPEND)) {
+ print_skip("KVM_CAP_ARM_SYSTEM_SUSPEND not supported");
+ exit(KSFT_SKIP);
+ }
vm = vm_create(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
kvm_vm_elf_load(vm, program_invocation_name);
ucall_init(vm, NULL);
+ cap.cap = KVM_CAP_ARM_SYSTEM_SUSPEND;
+ vm_enable_cap(vm, &cap);
+
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);
-
- /*
- * make sure the target is already off when executing the test.
- */
- init.features[0] |= (1 << KVM_ARM_VCPU_POWER_OFF);
aarch64_vcpu_add_default(vm, VCPU_ID_TARGET, &init, guest_main);
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);
-
- switch (get_ucall(vm, VCPU_ID_SOURCE, &uc)) {
- case UCALL_DONE:
- break;
- case 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);
+ for (i = 0; i < 2; i++) {
+ struct kvm_run *run = vcpu_state(vm, VCPU_ID_SOURCE);
+
+ /*
+ * make sure the target is already off when executing the test.
+ */
+ vcpu_set_mp_state(vm, VCPU_ID_TARGET, &target_mp_state);
+ vcpu_run(vm, VCPU_ID_SOURCE);
+ switch (run->exit_reason) {
+ case KVM_EXIT_MMIO:
+ switch (get_ucall(vm, VCPU_ID_SOURCE, &uc)) {
+ case UCALL_DONE:
+ vcpu_to_test = VCPU_ID_TARGET;
+ break;
+ case 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);
+ }
+ break;
+ case KVM_EXIT_SYSTEM_EVENT:
+ TEST_ASSERT(run->system_event.type == KVM_SYSTEM_EVENT_SUSPEND,
+ "unhandled system event: %u (expected: %u)",
+ run->system_event.type, KVM_SYSTEM_EVENT_SUSPEND);
+ vcpu_to_test = VCPU_ID_SOURCE;
+ break;
+ default:
+ TEST_FAIL("unhandled exit reason: %u (%s)",
+ run->exit_reason, exit_reason_str(run->exit_reason));
+ }
+
+ get_reg(vm, vcpu_to_test, ARM64_CORE_REG(regs.pc), &obs_pc);
+ get_reg(vm, vcpu_to_test, ARM64_CORE_REG(regs.regs[0]), &obs_x0);
+
+ TEST_ASSERT(obs_pc == CPU_ON_ENTRY_ADDR,
+ "unexpected target cpu pc: %lx (expected: %lx)",
+ obs_pc, CPU_ON_ENTRY_ADDR);
+ TEST_ASSERT(obs_x0 == CPU_ON_CONTEXT_ID,
+ "unexpected target context id: %lx (expected: %lx)",
+ obs_x0, CPU_ON_CONTEXT_ID);
- TEST_ASSERT(obs_pc == CPU_ON_ENTRY_ADDR,
- "unexpected target cpu pc: %lx (expected: %lx)",
- obs_pc, CPU_ON_ENTRY_ADDR);
- TEST_ASSERT(obs_x0 == CPU_ON_CONTEXT_ID,
- "unexpected target context id: %lx (expected: %lx)",
- obs_x0, CPU_ON_CONTEXT_ID);
+ }
kvm_vm_free(vm);
return 0;
--
2.33.0.rc2.250.ged5fa647cd-goog
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