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 #define VCPU_ID 5 16 17 static struct kvm_vm *vm; 18 19 static void l2_guest_code(struct svm_test_data *svm) 20 { 21 __asm__ __volatile__("vmcall"); 22 } 23 24 static void l1_guest_code(struct svm_test_data *svm) 25 { 26 #define L2_GUEST_STACK_SIZE 64 27 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; 28 struct vmcb *vmcb = svm->vmcb; 29 30 /* Prepare for L2 execution. */ 31 generic_svm_setup(svm, l2_guest_code, 32 &l2_guest_stack[L2_GUEST_STACK_SIZE]); 33 34 run_guest(vmcb, svm->vmcb_gpa); 35 36 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); 37 GUEST_DONE(); 38 } 39 40 int main(int argc, char *argv[]) 41 { 42 vm_vaddr_t svm_gva; 43 44 nested_svm_check_supported(); 45 46 vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code); 47 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid()); 48 49 vcpu_alloc_svm(vm, &svm_gva); 50 vcpu_args_set(vm, VCPU_ID, 1, svm_gva); 51 52 for (;;) { 53 volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID); 54 struct ucall uc; 55 56 vcpu_run(vm, VCPU_ID); 57 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, 58 "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n", 59 run->exit_reason, 60 exit_reason_str(run->exit_reason)); 61 62 switch (get_ucall(vm, VCPU_ID, &uc)) { 63 case UCALL_ABORT: 64 TEST_ASSERT(false, "%s", 65 (const char *)uc.args[0]); 66 /* NOT REACHED */ 67 case UCALL_SYNC: 68 break; 69 case UCALL_DONE: 70 goto done; 71 default: 72 TEST_ASSERT(false, 73 "Unknown ucall 0x%x.", uc.cmd); 74 } 75 } 76 done: 77 kvm_vm_free(vm); 78 return 0; 79 } 80