tools/testing/selftests/kvm/x86_64/state_test.c

   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
  22 #define VCPU_ID         5
  23
  24 void l2_guest_code(void)
  25 {
  26         GUEST_SYNC(6);
  27
  28         /* Exit to L1 */
  29         vmcall();
  30
  31         /* L1 has now set up a shadow VMCS for us.  */
  32         GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
  33         GUEST_SYNC(10);
  34         GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
  35         GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0fffee));
  36         GUEST_SYNC(11);
  37         GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0fffee);
  38         GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0ffffee));
  39         GUEST_SYNC(12);
  40
  41         /* Done, exit to L1 and never come back.  */
  42         vmcall();
  43 }
  44
  45 void l1_guest_code(struct vmx_pages *vmx_pages)
  46 {
  47 #define L2_GUEST_STACK_SIZE 64
  48         unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
  49
  50         GUEST_ASSERT(vmx_pages->vmcs_gpa);
  51         GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
  52         GUEST_SYNC(3);
  53         GUEST_ASSERT(load_vmcs(vmx_pages));
  54         GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
  55
  56         GUEST_SYNC(4);
  57         GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
  58
  59         prepare_vmcs(vmx_pages, l2_guest_code,
  60                      &l2_guest_stack[L2_GUEST_STACK_SIZE]);
  61
  62         GUEST_SYNC(5);
  63         GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
  64         GUEST_ASSERT(!vmlaunch());
  65         GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
  66         GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
  67
  68         /* Check that the launched state is preserved.  */
  69         GUEST_ASSERT(vmlaunch());
  70
  71         GUEST_ASSERT(!vmresume());
  72         GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
  73
  74         GUEST_SYNC(7);
  75         GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
  76
  77         GUEST_ASSERT(!vmresume());
  78         GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
  79
  80         vmwrite(GUEST_RIP, vmreadz(GUEST_RIP) + 3);
  81
  82         vmwrite(SECONDARY_VM_EXEC_CONTROL, SECONDARY_EXEC_SHADOW_VMCS);
  83         vmwrite(VMCS_LINK_POINTER, vmx_pages->shadow_vmcs_gpa);
  84
  85         GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa));
  86         GUEST_ASSERT(vmlaunch());
  87         GUEST_SYNC(8);
  88         GUEST_ASSERT(vmlaunch());
  89         GUEST_ASSERT(vmresume());
  90
  91         vmwrite(GUEST_RIP, 0xc0ffee);
  92         GUEST_SYNC(9);
  93         GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
  94
  95         GUEST_ASSERT(!vmptrld(vmx_pages->vmcs_gpa));
  96         GUEST_ASSERT(!vmresume());
  97         GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
  98
  99         GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa));
 100         GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee);
 101         GUEST_ASSERT(vmlaunch());
 102         GUEST_ASSERT(vmresume());
 103         GUEST_SYNC(13);
 104         GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee);
 105         GUEST_ASSERT(vmlaunch());
 106         GUEST_ASSERT(vmresume());
 107 }
 108
 109 void guest_code(struct vmx_pages *vmx_pages)
 110 {
 111         GUEST_SYNC(1);
 112         GUEST_SYNC(2);
 113
 114         if (vmx_pages)
 115                 l1_guest_code(vmx_pages);
 116
 117         GUEST_DONE();
 118 }
 119
 120 int main(int argc, char *argv[])
 121 {
 122         vm_vaddr_t vmx_pages_gva = 0;
 123
 124         struct kvm_regs regs1, regs2;
 125         struct kvm_vm *vm;
 126         struct kvm_run *run;
 127         struct kvm_x86_state *state;
 128         struct ucall uc;
 129         int stage;
 130
 131         /* Create VM */
 132         vm = vm_create_default(VCPU_ID, 0, guest_code);
 133         vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
 134         run = vcpu_state(vm, VCPU_ID);
 135
 136         vcpu_regs_get(vm, VCPU_ID, &regs1);
 137
 138         if (kvm_check_cap(KVM_CAP_NESTED_STATE)) {
 139                 vcpu_alloc_vmx(vm, &vmx_pages_gva);
 140                 vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
 141         } else {
 142                 printf("will skip nested state checks\n");
 143                 vcpu_args_set(vm, VCPU_ID, 1, 0);
 144         }
 145
 146         for (stage = 1;; stage++) {
 147                 _vcpu_run(vm, VCPU_ID);
 148                 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 149                             "Stage %d: unexpected exit reason: %u (%s),\n",
 150                             stage, run->exit_reason,
 151                             exit_reason_str(run->exit_reason));
 152
 153                 switch (get_ucall(vm, VCPU_ID, &uc)) {
 154                 case UCALL_ABORT:
 155                         TEST_ASSERT(false, "%s at %s:%d", (const char *)uc.args[0],
 156                                     __FILE__, uc.args[1]);
 157                         /* NOT REACHED */
 158                 case UCALL_SYNC:
 159                         break;
 160                 case UCALL_DONE:
 161                         goto done;
 162                 default:
 163                         TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
 164                 }
 165
 166                 /* UCALL_SYNC is handled here.  */
 167                 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
 168                             uc.args[1] == stage, "Unexpected register values vmexit #%lx, got %lx",
 169                             stage, (ulong)uc.args[1]);
 170
 171                 state = vcpu_save_state(vm, VCPU_ID);
 172                 memset(&regs1, 0, sizeof(regs1));
 173                 vcpu_regs_get(vm, VCPU_ID, &regs1);
 174
 175                 kvm_vm_release(vm);
 176
 177                 /* Restore state in a new VM.  */
 178                 kvm_vm_restart(vm, O_RDWR);
 179                 vm_vcpu_add(vm, VCPU_ID);
 180                 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
 181                 vcpu_load_state(vm, VCPU_ID, state);
 182                 run = vcpu_state(vm, VCPU_ID);
 183                 free(state);
 184
 185                 memset(&regs2, 0, sizeof(regs2));
 186                 vcpu_regs_get(vm, VCPU_ID, &regs2);
 187                 TEST_ASSERT(!memcmp(&regs1, &regs2, sizeof(regs2)),
 188                             "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
 189                             (ulong) regs2.rdi, (ulong) regs2.rsi);
 190         }
 191
 192 done:
 193         kvm_vm_free(vm);
 194 }