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 VCPU_ID 5 24 #define L2_GUEST_STACK_SIZE 256 25 26 void svm_l2_guest_code(void) 27 { 28 GUEST_SYNC(4); 29 /* Exit to L1 */ 30 vmcall(); 31 GUEST_SYNC(6); 32 /* Done, exit to L1 and never come back. */ 33 vmcall(); 34 } 35 36 static void svm_l1_guest_code(struct svm_test_data *svm) 37 { 38 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; 39 struct vmcb *vmcb = svm->vmcb; 40 41 GUEST_ASSERT(svm->vmcb_gpa); 42 /* Prepare for L2 execution. */ 43 generic_svm_setup(svm, svm_l2_guest_code, 44 &l2_guest_stack[L2_GUEST_STACK_SIZE]); 45 46 GUEST_SYNC(3); 47 run_guest(vmcb, svm->vmcb_gpa); 48 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); 49 GUEST_SYNC(5); 50 vmcb->save.rip += 3; 51 run_guest(vmcb, svm->vmcb_gpa); 52 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); 53 GUEST_SYNC(7); 54 } 55 56 void vmx_l2_guest_code(void) 57 { 58 GUEST_SYNC(6); 59 60 /* Exit to L1 */ 61 vmcall(); 62 63 /* L1 has now set up a shadow VMCS for us. */ 64 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee); 65 GUEST_SYNC(10); 66 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee); 67 GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0fffee)); 68 GUEST_SYNC(11); 69 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0fffee); 70 GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0ffffee)); 71 GUEST_SYNC(12); 72 73 /* Done, exit to L1 and never come back. */ 74 vmcall(); 75 } 76 77 static void vmx_l1_guest_code(struct vmx_pages *vmx_pages) 78 { 79 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; 80 81 GUEST_ASSERT(vmx_pages->vmcs_gpa); 82 GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages)); 83 GUEST_SYNC(3); 84 GUEST_ASSERT(load_vmcs(vmx_pages)); 85 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa); 86 87 GUEST_SYNC(4); 88 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa); 89 90 prepare_vmcs(vmx_pages, vmx_l2_guest_code, 91 &l2_guest_stack[L2_GUEST_STACK_SIZE]); 92 93 GUEST_SYNC(5); 94 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa); 95 GUEST_ASSERT(!vmlaunch()); 96 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa); 97 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); 98 99 /* Check that the launched state is preserved. */ 100 GUEST_ASSERT(vmlaunch()); 101 102 GUEST_ASSERT(!vmresume()); 103 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); 104 105 GUEST_SYNC(7); 106 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); 107 108 GUEST_ASSERT(!vmresume()); 109 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); 110 111 vmwrite(GUEST_RIP, vmreadz(GUEST_RIP) + 3); 112 113 vmwrite(SECONDARY_VM_EXEC_CONTROL, SECONDARY_EXEC_SHADOW_VMCS); 114 vmwrite(VMCS_LINK_POINTER, vmx_pages->shadow_vmcs_gpa); 115 116 GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa)); 117 GUEST_ASSERT(vmlaunch()); 118 GUEST_SYNC(8); 119 GUEST_ASSERT(vmlaunch()); 120 GUEST_ASSERT(vmresume()); 121 122 vmwrite(GUEST_RIP, 0xc0ffee); 123 GUEST_SYNC(9); 124 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee); 125 126 GUEST_ASSERT(!vmptrld(vmx_pages->vmcs_gpa)); 127 GUEST_ASSERT(!vmresume()); 128 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); 129 130 GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa)); 131 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee); 132 GUEST_ASSERT(vmlaunch()); 133 GUEST_ASSERT(vmresume()); 134 GUEST_SYNC(13); 135 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee); 136 GUEST_ASSERT(vmlaunch()); 137 GUEST_ASSERT(vmresume()); 138 } 139 140 static void __attribute__((__flatten__)) guest_code(void *arg) 141 { 142 GUEST_SYNC(1); 143 GUEST_SYNC(2); 144 145 if (arg) { 146 if (cpu_has_svm()) 147 svm_l1_guest_code(arg); 148 else 149 vmx_l1_guest_code(arg); 150 } 151 152 GUEST_DONE(); 153 } 154 155 int main(int argc, char *argv[]) 156 { 157 vm_vaddr_t nested_gva = 0; 158 159 struct kvm_regs regs1, regs2; 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_default(VCPU_ID, 0, guest_code); 168 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid()); 169 run = vcpu_state(vm, VCPU_ID); 170 171 vcpu_regs_get(vm, VCPU_ID, ®s1); 172 173 if (kvm_check_cap(KVM_CAP_NESTED_STATE)) { 174 if (nested_svm_supported()) 175 vcpu_alloc_svm(vm, &nested_gva); 176 else if (nested_vmx_supported()) 177 vcpu_alloc_vmx(vm, &nested_gva); 178 } 179 180 if (!nested_gva) 181 pr_info("will skip nested state checks\n"); 182 183 vcpu_args_set(vm, VCPU_ID, 1, nested_gva); 184 185 for (stage = 1;; stage++) { 186 _vcpu_run(vm, VCPU_ID); 187 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, 188 "Stage %d: unexpected exit reason: %u (%s),\n", 189 stage, run->exit_reason, 190 exit_reason_str(run->exit_reason)); 191 192 switch (get_ucall(vm, VCPU_ID, &uc)) { 193 case UCALL_ABORT: 194 TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0], 195 __FILE__, uc.args[1]); 196 /* NOT REACHED */ 197 case UCALL_SYNC: 198 break; 199 case UCALL_DONE: 200 goto done; 201 default: 202 TEST_FAIL("Unknown ucall %lu", uc.cmd); 203 } 204 205 /* UCALL_SYNC is handled here. */ 206 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") && 207 uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx", 208 stage, (ulong)uc.args[1]); 209 210 state = vcpu_save_state(vm, VCPU_ID); 211 memset(®s1, 0, sizeof(regs1)); 212 vcpu_regs_get(vm, VCPU_ID, ®s1); 213 214 kvm_vm_release(vm); 215 216 /* Restore state in a new VM. */ 217 kvm_vm_restart(vm, O_RDWR); 218 vm_vcpu_add(vm, VCPU_ID); 219 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid()); 220 vcpu_load_state(vm, VCPU_ID, state); 221 run = vcpu_state(vm, VCPU_ID); 222 free(state); 223 224 memset(®s2, 0, sizeof(regs2)); 225 vcpu_regs_get(vm, VCPU_ID, ®s2); 226 TEST_ASSERT(!memcmp(®s1, ®s2, sizeof(regs2)), 227 "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx", 228 (ulong) regs2.rdi, (ulong) regs2.rsi); 229 } 230 231 done: 232 kvm_vm_free(vm); 233 } 234