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Message-ID: <20250414214801.2693294-18-sagis@google.com>
Date: Mon, 14 Apr 2025 14:47:46 -0700
From: Sagi Shahar <sagis@...gle.com>
To: linux-kselftest@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
Shuah Khan <shuah@...nel.org>, Sean Christopherson <seanjc@...gle.com>,
Ackerley Tng <ackerleytng@...gle.com>, Ryan Afranji <afranji@...gle.com>,
Andrew Jones <ajones@...tanamicro.com>, Isaku Yamahata <isaku.yamahata@...el.com>,
Erdem Aktas <erdemaktas@...gle.com>, Rick Edgecombe <rick.p.edgecombe@...el.com>,
Sagi Shahar <sagis@...gle.com>, Roger Wang <runanwang@...gle.com>,
Binbin Wu <binbin.wu@...ux.intel.com>, Oliver Upton <oliver.upton@...ux.dev>,
"Pratik R. Sampat" <pratikrajesh.sampat@....com>, Reinette Chatre <reinette.chatre@...el.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH v6 17/30] KVM: selftests: TDX: Add TDX HLT exit test
From: Erdem Aktas <erdemaktas@...gle.com>
The test verifies that the guest runs TDVMCALL<INSTRUCTION.HLT> and the
guest vCPU enters to the halted state.
Co-developed-by: Sagi Shahar <sagis@...gle.com>
Signed-off-by: Sagi Shahar <sagis@...gle.com>
Signed-off-by: Erdem Aktas <erdemaktas@...gle.com>
Signed-off-by: Sagi Shahar <sagis@...gle.com>
---
.../selftests/kvm/include/x86/tdx/tdx.h | 2 +
tools/testing/selftests/kvm/lib/x86/tdx/tdx.c | 10 +++
tools/testing/selftests/kvm/x86/tdx_vm_test.c | 81 ++++++++++++++++++-
3 files changed, 92 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/include/x86/tdx/tdx.h b/tools/testing/selftests/kvm/include/x86/tdx/tdx.h
index 56359a8c4c19..b5831919a215 100644
--- a/tools/testing/selftests/kvm/include/x86/tdx/tdx.h
+++ b/tools/testing/selftests/kvm/include/x86/tdx/tdx.h
@@ -9,6 +9,7 @@
#define TDG_VP_VMCALL_GET_TD_VM_CALL_INFO 0x10000
#define TDG_VP_VMCALL_REPORT_FATAL_ERROR 0x10003
+#define TDG_VP_VMCALL_INSTRUCTION_HLT 12
#define TDG_VP_VMCALL_INSTRUCTION_IO 30
#define TDG_VP_VMCALL_INSTRUCTION_RDMSR 31
#define TDG_VP_VMCALL_INSTRUCTION_WRMSR 32
@@ -20,4 +21,5 @@ uint64_t tdg_vp_vmcall_get_td_vmcall_info(uint64_t *r11, uint64_t *r12,
uint64_t *r13, uint64_t *r14);
uint64_t tdg_vp_vmcall_instruction_rdmsr(uint64_t index, uint64_t *ret_value);
uint64_t tdg_vp_vmcall_instruction_wrmsr(uint64_t index, uint64_t value);
+uint64_t tdg_vp_vmcall_instruction_hlt(uint64_t interrupt_blocked_flag);
#endif // SELFTEST_TDX_TDX_H
diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c b/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c
index 99ec45a5a657..e89ca727286e 100644
--- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c
+++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c
@@ -93,3 +93,13 @@ uint64_t tdg_vp_vmcall_instruction_wrmsr(uint64_t index, uint64_t value)
return __tdx_hypercall(&args, 0);
}
+
+uint64_t tdg_vp_vmcall_instruction_hlt(uint64_t interrupt_blocked_flag)
+{
+ struct tdx_hypercall_args args = {
+ .r11 = TDG_VP_VMCALL_INSTRUCTION_HLT,
+ .r12 = interrupt_blocked_flag,
+ };
+
+ return __tdx_hypercall(&args, 0);
+}
diff --git a/tools/testing/selftests/kvm/x86/tdx_vm_test.c b/tools/testing/selftests/kvm/x86/tdx_vm_test.c
index 079ac266a44e..720ef5e87071 100644
--- a/tools/testing/selftests/kvm/x86/tdx_vm_test.c
+++ b/tools/testing/selftests/kvm/x86/tdx_vm_test.c
@@ -642,6 +642,83 @@ void verify_guest_msr_writes(void)
printf("\t ... PASSED\n");
}
+/*
+ * Verifies HLT functionality.
+ */
+void guest_hlt(void)
+{
+ uint64_t interrupt_blocked_flag;
+ uint64_t ret;
+
+ interrupt_blocked_flag = 0;
+ ret = tdg_vp_vmcall_instruction_hlt(interrupt_blocked_flag);
+ tdx_assert_error(ret);
+
+ tdx_test_success();
+}
+
+void _verify_guest_hlt(int signum);
+
+void wake_me(int interval)
+{
+ struct sigaction action;
+
+ action.sa_handler = _verify_guest_hlt;
+ sigemptyset(&action.sa_mask);
+ action.sa_flags = 0;
+
+ TEST_ASSERT(sigaction(SIGALRM, &action, NULL) == 0,
+ "Could not set the alarm handler!");
+
+ alarm(interval);
+}
+
+void _verify_guest_hlt(int signum)
+{
+ static struct kvm_vcpu *vcpu;
+ struct kvm_vm *vm;
+
+ /*
+ * This function will also be called by SIGALRM handler to check the
+ * vCPU MP State. If vm has been initialized, then we are in the signal
+ * handler. Check the MP state and let the guest run again.
+ */
+ if (vcpu) {
+ struct kvm_mp_state mp_state;
+
+ vcpu_mp_state_get(vcpu, &mp_state);
+ TEST_ASSERT_EQ(mp_state.mp_state, KVM_MP_STATE_HALTED);
+
+ /* Let the guest to run and finish the test.*/
+ mp_state.mp_state = KVM_MP_STATE_RUNNABLE;
+ vcpu_mp_state_set(vcpu, &mp_state);
+ return;
+ }
+
+ vm = td_create();
+ td_initialize(vm, VM_MEM_SRC_ANONYMOUS, 0);
+ vcpu = td_vcpu_add(vm, 0, guest_hlt);
+ td_finalize(vm);
+
+ printf("Verifying HLT:\n");
+
+ printf("\t ... Running guest\n");
+
+ /* Wait 1 second for guest to execute HLT */
+ wake_me(1);
+ tdx_run(vcpu);
+
+ tdx_test_assert_success(vcpu);
+
+ kvm_vm_free(vm);
+ printf("\t ... PASSED\n");
+}
+
+void verify_guest_hlt(void)
+{
+ _verify_guest_hlt(0);
+}
+
int main(int argc, char **argv)
{
ksft_print_header();
@@ -649,7 +726,7 @@ int main(int argc, char **argv)
if (!is_tdx_enabled())
ksft_exit_skip("TDX is not supported by the KVM. Exiting.\n");
- ksft_set_plan(9);
+ ksft_set_plan(10);
ksft_test_result(!run_in_new_process(&verify_td_lifecycle),
"verify_td_lifecycle\n");
ksft_test_result(!run_in_new_process(&verify_report_fatal_error),
@@ -668,6 +745,8 @@ int main(int argc, char **argv)
"verify_guest_msr_writes\n");
ksft_test_result(!run_in_new_process(&verify_guest_msr_reads),
"verify_guest_msr_reads\n");
+ ksft_test_result(!run_in_new_process(&verify_guest_hlt),
+ "verify_guest_hlt\n");
ksft_finished();
return 0;
--
2.49.0.504.g3bcea36a83-goog
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