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 static bool have_nested_state;
  23
  24 void l2_guest_code(void)
  25 {
  26         GUEST_SYNC(6);
  27
  28         GUEST_SYNC(7);
  29
  30         /* Done, exit to L1 and never come back.  */
  31         vmcall();
  32 }
  33
  34 void l1_guest_code(struct vmx_pages *vmx_pages)
  35 {
  36 #define L2_GUEST_STACK_SIZE 64
  37         unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
  38
  39         enable_vp_assist(vmx_pages->vp_assist_gpa, vmx_pages->vp_assist);
  40
  41         GUEST_ASSERT(vmx_pages->vmcs_gpa);
  42         GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
  43         GUEST_SYNC(3);
  44         GUEST_ASSERT(load_vmcs(vmx_pages));
  45         GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
  46
  47         GUEST_SYNC(4);
  48         GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
  49
  50         prepare_vmcs(vmx_pages, l2_guest_code,
  51                      &l2_guest_stack[L2_GUEST_STACK_SIZE]);
  52
  53         GUEST_SYNC(5);
  54         GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
  55         GUEST_ASSERT(!vmlaunch());
  56         GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
  57         GUEST_SYNC(8);
  58         GUEST_ASSERT(!vmresume());
  59         GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
  60         GUEST_SYNC(9);
  61 }
  62
  63 void guest_code(struct vmx_pages *vmx_pages)
  64 {
  65         GUEST_SYNC(1);
  66         GUEST_SYNC(2);
  67
  68         if (vmx_pages)
  69                 l1_guest_code(vmx_pages);
  70
  71         GUEST_DONE();
  72 }
  73
  74 int main(int argc, char *argv[])
  75 {
  76         struct vmx_pages *vmx_pages = NULL;
  77         vm_vaddr_t vmx_pages_gva = 0;
  78
  79         struct kvm_regs regs1, regs2;
  80         struct kvm_vm *vm;
  81         struct kvm_run *run;
  82         struct kvm_x86_state *state;
  83         struct ucall uc;
  84         int stage;
  85         uint16_t evmcs_ver;
  86         struct kvm_enable_cap enable_evmcs_cap = {
  87                 .cap = KVM_CAP_HYPERV_ENLIGHTENED_VMCS,
  88                  .args[0] = (unsigned long)&evmcs_ver
  89         };
  90
  91         struct kvm_cpuid_entry2 *entry = kvm_get_supported_cpuid_entry(1);
  92
  93         /* Create VM */
  94         vm = vm_create_default(VCPU_ID, 0, guest_code);
  95
  96         vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
  97
  98         if (!kvm_check_cap(KVM_CAP_NESTED_STATE) ||
  99             !kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
 100                 printf("capabilities not available, skipping test\n");
 101                 exit(KSFT_SKIP);
 102         }
 103
 104         vcpu_ioctl(vm, VCPU_ID, KVM_ENABLE_CAP, &enable_evmcs_cap);
 105
 106         /* KVM should return supported EVMCS version range */
 107         TEST_ASSERT(((evmcs_ver >> 8) >= (evmcs_ver & 0xff)) &&
 108                     (evmcs_ver & 0xff) > 0,
 109                     "Incorrect EVMCS version range: %x:%x\n",
 110                     evmcs_ver & 0xff, evmcs_ver >> 8);
 111
 112         run = vcpu_state(vm, VCPU_ID);
 113
 114         vcpu_regs_get(vm, VCPU_ID, &regs1);
 115
 116         vmx_pages = vcpu_alloc_vmx(vm, &vmx_pages_gva);
 117         vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
 118
 119         for (stage = 1;; stage++) {
 120                 _vcpu_run(vm, VCPU_ID);
 121                 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 122                             "Stage %d: unexpected exit reason: %u (%s),\n",
 123                             stage, run->exit_reason,
 124                             exit_reason_str(run->exit_reason));
 125
 126                 memset(&regs1, 0, sizeof(regs1));
 127                 vcpu_regs_get(vm, VCPU_ID, &regs1);
 128                 switch (get_ucall(vm, VCPU_ID, &uc)) {
 129                 case UCALL_ABORT:
 130                         TEST_ASSERT(false, "%s at %s:%d", (const char *)uc.args[0],
 131                                     __FILE__, uc.args[1]);
 132                         /* NOT REACHED */
 133                 case UCALL_SYNC:
 134                         break;
 135                 case UCALL_DONE:
 136                         goto done;
 137                 default:
 138                         TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
 139                 }
 140
 141                 /* UCALL_SYNC is handled here.  */
 142                 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
 143                             uc.args[1] == stage, "Unexpected register values vmexit #%lx, got %lx",
 144                             stage, (ulong)uc.args[1]);
 145
 146                 state = vcpu_save_state(vm, VCPU_ID);
 147                 kvm_vm_release(vm);
 148
 149                 /* Restore state in a new VM.  */
 150                 kvm_vm_restart(vm, O_RDWR);
 151                 vm_vcpu_add(vm, VCPU_ID, 0, 0);
 152                 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
 153                 vcpu_load_state(vm, VCPU_ID, state);
 154                 run = vcpu_state(vm, VCPU_ID);
 155                 free(state);
 156
 157                 memset(&regs2, 0, sizeof(regs2));
 158                 vcpu_regs_get(vm, VCPU_ID, &regs2);
 159                 TEST_ASSERT(!memcmp(&regs1, &regs2, sizeof(regs2)),
 160                             "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
 161                             (ulong) regs2.rdi, (ulong) regs2.rsi);
 162         }
 163
 164 done:
 165         kvm_vm_free(vm);
 166 }