linux-kernel - [PATCH v4 4/6] KVM: selftests: Add test for PSCI SYSTEM

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Message-ID: <20240924160512.4138879-4-dwmw2@infradead.org>
Date: Tue, 24 Sep 2024 17:05:10 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: Paolo Bonzini <pbonzini@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Pavel Machek <pavel@....cz>,
	Len Brown <len.brown@...el.com>,
	Shuah Khan <shuah@...nel.org>,
	David Woodhouse <dwmw@...zon.co.uk>,
	kvm@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-pm@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH v4 4/6] KVM: selftests: Add test for PSCI SYSTEM_OFF2

From: David Woodhouse <dwmw@...zon.co.uk>

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
---
 .../testing/selftests/kvm/aarch64/psci_test.c | 61 +++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/tools/testing/selftests/kvm/aarch64/psci_test.c b/tools/testing/selftests/kvm/aarch64/psci_test.c
index 61731a950def..b7e37956aecf 100644
--- a/tools/testing/selftests/kvm/aarch64/psci_test.c
+++ b/tools/testing/selftests/kvm/aarch64/psci_test.c
@@ -54,6 +54,15 @@ static uint64_t psci_system_suspend(uint64_t entry_addr, uint64_t context_id)
 	return res.a0;
 }
 
+static uint64_t psci_system_off2(uint64_t type)
+{
+	struct arm_smccc_res res;
+
+	smccc_hvc(PSCI_1_3_FN64_SYSTEM_OFF2, type, 0, 0, 0, 0, 0, 0, &res);
+
+	return res.a0;
+}
+
 static uint64_t psci_features(uint32_t func_id)
 {
 	struct arm_smccc_res res;
@@ -188,11 +197,63 @@ static void host_test_system_suspend(void)
 	kvm_vm_free(vm);
 }
 
+static void guest_test_system_off2(void)
+{
+	uint64_t ret;
+
+	/* assert that SYSTEM_OFF2 is discoverable */
+	GUEST_ASSERT(psci_features(PSCI_1_3_FN_SYSTEM_OFF2) &
+		     BIT(PSCI_1_3_HIBERNATE_TYPE_OFF));
+	GUEST_ASSERT(psci_features(PSCI_1_3_FN64_SYSTEM_OFF2) &
+		     BIT(PSCI_1_3_HIBERNATE_TYPE_OFF));
+
+	ret = psci_system_off2(PSCI_1_3_HIBERNATE_TYPE_OFF);
+	GUEST_SYNC(ret);
+}
+
+static void host_test_system_off2(void)
+{
+	struct kvm_vcpu *source, *target;
+	uint64_t psci_version = 0;
+	struct kvm_run *run;
+	struct kvm_vm *vm;
+
+	vm = setup_vm(guest_test_system_off2, &source, &target);
+	vcpu_get_reg(target, KVM_REG_ARM_PSCI_VERSION, &psci_version);
+	TEST_ASSERT(psci_version >= PSCI_VERSION(0, 2),
+		    "Unexpected PSCI version %lu.%lu",
+		    PSCI_VERSION_MAJOR(psci_version),
+		    PSCI_VERSION_MINOR(psci_version));
+
+	if (psci_version < PSCI_VERSION(1,3))
+		goto skip;
+
+	vcpu_power_off(target);
+	run = source->run;
+
+	enter_guest(source);
+
+	TEST_ASSERT_KVM_EXIT_REASON(source, KVM_EXIT_SYSTEM_EVENT);
+	TEST_ASSERT(run->system_event.type == KVM_SYSTEM_EVENT_SHUTDOWN,
+		    "Unhandled system event: %u (expected: %u)",
+		    run->system_event.type, KVM_SYSTEM_EVENT_SHUTDOWN);
+	TEST_ASSERT(run->system_event.ndata >= 1,
+		    "Unexpected amount of system event data: %u (expected, >= 1)",
+		    run->system_event.ndata);
+	TEST_ASSERT(run->system_event.data[0] & KVM_SYSTEM_EVENT_SHUTDOWN_FLAG_PSCI_OFF2,
+		    "PSCI_OFF2 flag not set. Flags %llu (expected %llu)",
+		    run->system_event.data[0], KVM_SYSTEM_EVENT_SHUTDOWN_FLAG_PSCI_OFF2);
+
+ skip:
+	kvm_vm_free(vm);
+}
+
 int main(void)
 {
 	TEST_REQUIRE(kvm_has_cap(KVM_CAP_ARM_SYSTEM_SUSPEND));
 
 	host_test_cpu_on();
 	host_test_system_suspend();
+	host_test_system_off2();
 	return 0;
 }
-- 
2.44.0