1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * KVM_GET/SET_* tests 4 * 5 * Copyright (C) 2018, Red Hat, Inc. 6 * 7 * Tests for vCPU state save/restore, including nested guest state. 8 */ 9 #define _GNU_SOURCE /* for program_invocation_short_name */ 10 #include <fcntl.h> 11 #include <stdio.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <sys/ioctl.h> 15 16 #include "test_util.h" 17 18 #include "kvm_util.h" 19 #include "processor.h" 20 #include "vmx.h" 21 #include "svm_util.h" 22 23 #define L2_GUEST_STACK_SIZE 256 24 25 void svm_l2_guest_code(void) 26 { 27 GUEST_SYNC(4); 28 /* Exit to L1 */ 29 vmcall(); 30 GUEST_SYNC(6); 31 /* Done, exit to L1 and never come back. */ 32 vmcall(); 33 } 34 35 static void svm_l1_guest_code(struct svm_test_data *svm) 36 { 37 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; 38 struct vmcb *vmcb = svm->vmcb; 39 40 GUEST_ASSERT(svm->vmcb_gpa); 41 /* Prepare for L2 execution. */ 42 generic_svm_setup(svm, svm_l2_guest_code, 43 &l2_guest_stack[L2_GUEST_STACK_SIZE]); 44 45 GUEST_SYNC(3); 46 run_guest(vmcb, svm->vmcb_gpa); 47 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); 48 GUEST_SYNC(5); 49 vmcb->save.rip += 3; 50 run_guest(vmcb, svm->vmcb_gpa); 51 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); 52 GUEST_SYNC(7); 53 } 54 55 void vmx_l2_guest_code(void) 56 { 57 GUEST_SYNC(6); 58 59 /* Exit to L1 */ 60 vmcall(); 61 62 /* L1 has now set up a shadow VMCS for us. */ 63 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee); 64 GUEST_SYNC(10); 65 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee); 66 GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0fffee)); 67 GUEST_SYNC(11); 68 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0fffee); 69 GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0ffffee)); 70 GUEST_SYNC(12); 71 72 /* Done, exit to L1 and never come back. */ 73 vmcall(); 74 } 75 76 static void vmx_l1_guest_code(struct vmx_pages *vmx_pages) 77 { 78 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; 79 80 GUEST_ASSERT(vmx_pages->vmcs_gpa); 81 GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages)); 82 GUEST_SYNC(3); 83 GUEST_ASSERT(load_vmcs(vmx_pages)); 84 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa); 85 86 GUEST_SYNC(4); 87 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa); 88 89 prepare_vmcs(vmx_pages, vmx_l2_guest_code, 90 &l2_guest_stack[L2_GUEST_STACK_SIZE]); 91 92 GUEST_SYNC(5); 93 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa); 94 GUEST_ASSERT(!vmlaunch()); 95 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa); 96 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); 97 98 /* Check that the launched state is preserved. */ 99 GUEST_ASSERT(vmlaunch()); 100 101 GUEST_ASSERT(!vmresume()); 102 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); 103 104 GUEST_SYNC(7); 105 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); 106 107 GUEST_ASSERT(!vmresume()); 108 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); 109 110 vmwrite(GUEST_RIP, vmreadz(GUEST_RIP) + 3); 111 112 vmwrite(SECONDARY_VM_EXEC_CONTROL, SECONDARY_EXEC_SHADOW_VMCS); 113 vmwrite(VMCS_LINK_POINTER, vmx_pages->shadow_vmcs_gpa); 114 115 GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa)); 116 GUEST_ASSERT(vmlaunch()); 117 GUEST_SYNC(8); 118 GUEST_ASSERT(vmlaunch()); 119 GUEST_ASSERT(vmresume()); 120 121 vmwrite(GUEST_RIP, 0xc0ffee); 122 GUEST_SYNC(9); 123 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee); 124 125 GUEST_ASSERT(!vmptrld(vmx_pages->vmcs_gpa)); 126 GUEST_ASSERT(!vmresume()); 127 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); 128 129 GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa)); 130 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee); 131 GUEST_ASSERT(vmlaunch()); 132 GUEST_ASSERT(vmresume()); 133 GUEST_SYNC(13); 134 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee); 135 GUEST_ASSERT(vmlaunch()); 136 GUEST_ASSERT(vmresume()); 137 } 138 139 static void __attribute__((__flatten__)) guest_code(void *arg) 140 { 141 GUEST_SYNC(1); 142 GUEST_SYNC(2); 143 144 if (arg) { 145 if (this_cpu_has(X86_FEATURE_SVM)) 146 svm_l1_guest_code(arg); 147 else 148 vmx_l1_guest_code(arg); 149 } 150 151 GUEST_DONE(); 152 } 153 154 int main(int argc, char *argv[]) 155 { 156 vm_vaddr_t nested_gva = 0; 157 158 struct kvm_regs regs1, regs2; 159 struct kvm_vcpu *vcpu; 160 struct kvm_vm *vm; 161 struct kvm_run *run; 162 struct kvm_x86_state *state; 163 struct ucall uc; 164 int stage; 165 166 /* Create VM */ 167 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 168 run = vcpu->run; 169 170 vcpu_regs_get(vcpu, ®s1); 171 172 if (kvm_has_cap(KVM_CAP_NESTED_STATE)) { 173 if (kvm_cpu_has(X86_FEATURE_SVM)) 174 vcpu_alloc_svm(vm, &nested_gva); 175 else if (kvm_cpu_has(X86_FEATURE_VMX)) 176 vcpu_alloc_vmx(vm, &nested_gva); 177 } 178 179 if (!nested_gva) 180 pr_info("will skip nested state checks\n"); 181 182 vcpu_args_set(vcpu, 1, nested_gva); 183 184 for (stage = 1;; stage++) { 185 vcpu_run(vcpu); 186 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, 187 "Stage %d: unexpected exit reason: %u (%s),\n", 188 stage, run->exit_reason, 189 exit_reason_str(run->exit_reason)); 190 191 switch (get_ucall(vcpu, &uc)) { 192 case UCALL_ABORT: 193 REPORT_GUEST_ASSERT(uc); 194 /* NOT REACHED */ 195 case UCALL_SYNC: 196 break; 197 case UCALL_DONE: 198 goto done; 199 default: 200 TEST_FAIL("Unknown ucall %lu", uc.cmd); 201 } 202 203 /* UCALL_SYNC is handled here. */ 204 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") && 205 uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx", 206 stage, (ulong)uc.args[1]); 207 208 state = vcpu_save_state(vcpu); 209 memset(®s1, 0, sizeof(regs1)); 210 vcpu_regs_get(vcpu, ®s1); 211 212 kvm_vm_release(vm); 213 214 /* Restore state in a new VM. */ 215 vcpu = vm_recreate_with_one_vcpu(vm); 216 vcpu_load_state(vcpu, state); 217 run = vcpu->run; 218 kvm_x86_state_cleanup(state); 219 220 memset(®s2, 0, sizeof(regs2)); 221 vcpu_regs_get(vcpu, ®s2); 222 TEST_ASSERT(!memcmp(®s1, ®s2, sizeof(regs2)), 223 "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx", 224 (ulong) regs2.rdi, (ulong) regs2.rsi); 225 } 226 227 done: 228 kvm_vm_free(vm); 229 } 230