1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * svm_vmcall_test 4 * 5 * Copyright (C) 2020, Red Hat, Inc. 6 * 7 * Nested SVM testing: VMCALL 8 */ 9 10 #include "test_util.h" 11 #include "kvm_util.h" 12 #include "processor.h" 13 #include "svm_util.h" 14 15 static void l2_guest_code(struct svm_test_data *svm) 16 { 17 __asm__ __volatile__("vmcall"); 18 } 19 20 static void l1_guest_code(struct svm_test_data *svm) 21 { 22 #define L2_GUEST_STACK_SIZE 64 23 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; 24 struct vmcb *vmcb = svm->vmcb; 25 26 /* Prepare for L2 execution. */ 27 generic_svm_setup(svm, l2_guest_code, 28 &l2_guest_stack[L2_GUEST_STACK_SIZE]); 29 30 run_guest(vmcb, svm->vmcb_gpa); 31 32 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); 33 GUEST_DONE(); 34 } 35 36 int main(int argc, char *argv[]) 37 { 38 struct kvm_vcpu *vcpu; 39 vm_vaddr_t svm_gva; 40 struct kvm_vm *vm; 41 42 TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM)); 43 44 vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code); 45 46 vcpu_alloc_svm(vm, &svm_gva); 47 vcpu_args_set(vcpu, 1, svm_gva); 48 49 for (;;) { 50 struct ucall uc; 51 52 vcpu_run(vcpu); 53 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); 54 55 switch (get_ucall(vcpu, &uc)) { 56 case UCALL_ABORT: 57 REPORT_GUEST_ASSERT(uc); 58 /* NOT REACHED */ 59 case UCALL_SYNC: 60 break; 61 case UCALL_DONE: 62 goto done; 63 default: 64 TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd); 65 } 66 } 67 done: 68 kvm_vm_free(vm); 69 return 0; 70 } 71