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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018, Red Hat, Inc.
   4  *
   5  * Tests for Enlightened VMCS, including nested guest state.
   6  */
   7 #define _GNU_SOURCE /* for program_invocation_short_name */
   8 #include <fcntl.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <sys/ioctl.h>
  13
  14 #include "test_util.h"
  15
  16 #include "kvm_util.h"
  17
  18 #include "vmx.h"
  19
  20 #define VCPU_ID         5
  21
  22 void l2_guest_code(void)
  23 {
  24         GUEST_SYNC(6);
  25
  26         GUEST_SYNC(7);
  27
  28         /* Done, exit to L1 and never come back.  */
  29         vmcall();
  30 }
  31
  32 void l1_guest_code(struct vmx_pages *vmx_pages)
  33 {
  34 #define L2_GUEST_STACK_SIZE 64
  35         unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
  36
  37         enable_vp_assist(vmx_pages->vp_assist_gpa, vmx_pages->vp_assist);
  38
  39         GUEST_ASSERT(vmx_pages->vmcs_gpa);
  40         GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
  41         GUEST_SYNC(3);
  42         GUEST_ASSERT(load_vmcs(vmx_pages));
  43         GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
  44
  45         GUEST_SYNC(4);
  46         GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
  47
  48         prepare_vmcs(vmx_pages, l2_guest_code,
  49                      &l2_guest_stack[L2_GUEST_STACK_SIZE]);
  50
  51         GUEST_SYNC(5);
  52         GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
  53         GUEST_ASSERT(!vmlaunch());
  54         GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
  55         GUEST_SYNC(8);
  56         GUEST_ASSERT(!vmresume());
  57         GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
  58         GUEST_SYNC(9);
  59 }
  60
  61 void guest_code(struct vmx_pages *vmx_pages)
  62 {
  63         GUEST_SYNC(1);
  64         GUEST_SYNC(2);
  65
  66         if (vmx_pages)
  67                 l1_guest_code(vmx_pages);
  68
  69         GUEST_DONE();
  70 }
  71
  72 int main(int argc, char *argv[])
  73 {
  74         vm_vaddr_t vmx_pages_gva = 0;
  75
  76         struct kvm_regs regs1, regs2;
  77         struct kvm_vm *vm;
  78         struct kvm_run *run;
  79         struct kvm_x86_state *state;
  80         struct ucall uc;
  81         int stage;
  82         uint16_t evmcs_ver;
  83         struct kvm_enable_cap enable_evmcs_cap = {
  84                 .cap = KVM_CAP_HYPERV_ENLIGHTENED_VMCS,
  85                  .args[0] = (unsigned long)&evmcs_ver
  86         };
  87
  88         /* Create VM */
  89         vm = vm_create_default(VCPU_ID, 0, guest_code);
  90
  91         vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
  92
  93         if (!kvm_check_cap(KVM_CAP_NESTED_STATE) ||
  94             !kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
  95                 printf("capabilities not available, skipping test\n");
  96                 exit(KSFT_SKIP);
  97         }
  98
  99         vcpu_ioctl(vm, VCPU_ID, KVM_ENABLE_CAP, &enable_evmcs_cap);
 100
 101         /* KVM should return supported EVMCS version range */
 102         TEST_ASSERT(((evmcs_ver >> 8) >= (evmcs_ver & 0xff)) &&
 103                     (evmcs_ver & 0xff) > 0,
 104                     "Incorrect EVMCS version range: %x:%x\n",
 105                     evmcs_ver & 0xff, evmcs_ver >> 8);
 106
 107         run = vcpu_state(vm, VCPU_ID);
 108
 109         vcpu_regs_get(vm, VCPU_ID, &regs1);
 110
 111         vcpu_alloc_vmx(vm, &vmx_pages_gva);
 112         vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
 113
 114         for (stage = 1;; stage++) {
 115                 _vcpu_run(vm, VCPU_ID);
 116                 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 117                             "Stage %d: unexpected exit reason: %u (%s),\n",
 118                             stage, run->exit_reason,
 119                             exit_reason_str(run->exit_reason));
 120
 121                 switch (get_ucall(vm, VCPU_ID, &uc)) {
 122                 case UCALL_ABORT:
 123                         TEST_ASSERT(false, "%s at %s:%d", (const char *)uc.args[0],
 124                                     __FILE__, uc.args[1]);
 125                         /* NOT REACHED */
 126                 case UCALL_SYNC:
 127                         break;
 128                 case UCALL_DONE:
 129                         goto done;
 130                 default:
 131                         TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
 132                 }
 133
 134                 /* UCALL_SYNC is handled here.  */
 135                 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
 136                             uc.args[1] == stage, "Unexpected register values vmexit #%lx, got %lx",
 137                             stage, (ulong)uc.args[1]);
 138
 139                 state = vcpu_save_state(vm, VCPU_ID);
 140                 memset(&regs1, 0, sizeof(regs1));
 141                 vcpu_regs_get(vm, VCPU_ID, &regs1);
 142
 143                 kvm_vm_release(vm);
 144
 145                 /* Restore state in a new VM.  */
 146                 kvm_vm_restart(vm, O_RDWR);
 147                 vm_vcpu_add(vm, VCPU_ID);
 148                 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
 149                 vcpu_ioctl(vm, VCPU_ID, KVM_ENABLE_CAP, &enable_evmcs_cap);
 150                 vcpu_load_state(vm, VCPU_ID, state);
 151                 run = vcpu_state(vm, VCPU_ID);
 152                 free(state);
 153
 154                 memset(&regs2, 0, sizeof(regs2));
 155                 vcpu_regs_get(vm, VCPU_ID, &regs2);
 156                 TEST_ASSERT(!memcmp(&regs1, &regs2, sizeof(regs2)),
 157                             "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
 158                             (ulong) regs2.rdi, (ulong) regs2.rsi);
 159         }
 160
 161 done:
 162         kvm_vm_free(vm);
 163 }