From: Sagi Shahar sagis@google.com
The test verifies that the guest runs TDVMCALL<INSTRUCTION.HLT> and the guest vCPU enters to the halted state.
Signed-off-by: Erdem Aktas erdemaktas@google.com Signed-off-by: Sagi Shahar sagis@google.com Signed-off-by: Ackerley Tng ackerleytng@google.com Change-Id: I253a2432bb29265bc3b3360f9254395761c5aadd Signed-off-by: Ryan Afranji afranji@google.com --- .../selftests/kvm/include/x86_64/tdx/tdx.h | 2 + .../selftests/kvm/lib/x86_64/tdx/tdx.c | 10 +++ .../selftests/kvm/x86_64/tdx_vm_tests.c | 78 +++++++++++++++++++ 3 files changed, 90 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h b/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h index 85ba6aab79a7..b18e39d20498 100644 --- a/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h +++ b/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h @@ -8,6 +8,7 @@ #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 @@ -20,5 +21,6 @@ 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_64/tdx/tdx.c b/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c index 88ea6f2a6469..9485bafedc38 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c +++ b/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c @@ -114,3 +114,13 @@ 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_64/tdx_vm_tests.c b/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c index 41dad6cf249b..f77caf262f84 100644 --- a/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c +++ b/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c @@ -721,6 +721,83 @@ void verify_guest_msr_writes(void) printf("\t ... PASSED\n"); }
+/* + * Verifies HLT functionality. + */ +void guest_hlt(void) +{ + uint64_t ret; + uint64_t interrupt_blocked_flag; + + interrupt_blocked_flag = 0; + ret = tdg_vp_vmcall_instruction_hlt(interrupt_blocked_flag); + if (ret) + tdx_test_fatal(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) +{ + struct kvm_vm *vm; + static struct kvm_vcpu *vcpu; + + /* + * 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 != NULL) { + struct kvm_mp_state mp_state; + + vcpu_mp_state_get(vcpu, &mp_state); + 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); + td_vcpu_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) { @@ -740,6 +817,7 @@ int main(int argc, char **argv) run_in_new_process(&verify_guest_reads); run_in_new_process(&verify_guest_msr_writes); run_in_new_process(&verify_guest_msr_reads); + run_in_new_process(&verify_guest_hlt);
return 0; }