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(7);
  25
  26         GUEST_SYNC(8);
  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         current_evmcs->revision_id = -1u;
  54         GUEST_ASSERT(vmlaunch());
  55         current_evmcs->revision_id = EVMCS_VERSION;
  56         GUEST_SYNC(6);
  57
  58         GUEST_ASSERT(!vmlaunch());
  59         GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
  60         GUEST_SYNC(9);
  61         GUEST_ASSERT(!vmresume());
  62         GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
  63         GUEST_SYNC(10);
  64 }
  65
  66 void guest_code(struct vmx_pages *vmx_pages)
  67 {
  68         GUEST_SYNC(1);
  69         GUEST_SYNC(2);
  70
  71         if (vmx_pages)
  72                 l1_guest_code(vmx_pages);
  73
  74         GUEST_DONE();
  75
  76         /* Try enlightened vmptrld with an incorrect GPA */
  77         evmcs_vmptrld(0xdeadbeef, vmx_pages->enlightened_vmcs);
  78         GUEST_ASSERT(vmlaunch());
  79 }
  80
  81 int main(int argc, char *argv[])
  82 {
  83         vm_vaddr_t vmx_pages_gva = 0;
  84
  85         struct kvm_regs regs1, regs2;
  86         struct kvm_vm *vm;
  87         struct kvm_run *run;
  88         struct kvm_x86_state *state;
  89         struct ucall uc;
  90         int stage;
  91
  92         /* Create VM */
  93         vm = vm_create_default(VCPU_ID, 0, guest_code);
  94
  95         if (!nested_vmx_supported() ||
  96             !kvm_check_cap(KVM_CAP_NESTED_STATE) ||
  97             !kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
  98                 print_skip("Enlightened VMCS is unsupported");
  99                 exit(KSFT_SKIP);
 100         }
 101
 102         vcpu_enable_evmcs(vm, VCPU_ID);
 103
 104         run = vcpu_state(vm, VCPU_ID);
 105
 106         vcpu_regs_get(vm, VCPU_ID, &regs1);
 107
 108         vcpu_alloc_vmx(vm, &vmx_pages_gva);
 109         vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
 110
 111         for (stage = 1;; stage++) {
 112                 _vcpu_run(vm, VCPU_ID);
 113                 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 114                             "Stage %d: unexpected exit reason: %u (%s),\n",
 115                             stage, run->exit_reason,
 116                             exit_reason_str(run->exit_reason));
 117
 118                 switch (get_ucall(vm, VCPU_ID, &uc)) {
 119                 case UCALL_ABORT:
 120                         TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0],
 121                                   __FILE__, uc.args[1]);
 122                         /* NOT REACHED */
 123                 case UCALL_SYNC:
 124                         break;
 125                 case UCALL_DONE:
 126                         goto part1_done;
 127                 default:
 128                         TEST_FAIL("Unknown ucall %lu", uc.cmd);
 129                 }
 130
 131                 /* UCALL_SYNC is handled here.  */
 132                 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
 133                             uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
 134                             stage, (ulong)uc.args[1]);
 135
 136                 state = vcpu_save_state(vm, VCPU_ID);
 137                 memset(&regs1, 0, sizeof(regs1));
 138                 vcpu_regs_get(vm, VCPU_ID, &regs1);
 139
 140                 kvm_vm_release(vm);
 141
 142                 /* Restore state in a new VM.  */
 143                 kvm_vm_restart(vm, O_RDWR);
 144                 vm_vcpu_add(vm, VCPU_ID);
 145                 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
 146                 vcpu_enable_evmcs(vm, VCPU_ID);
 147                 vcpu_load_state(vm, VCPU_ID, state);
 148                 run = vcpu_state(vm, VCPU_ID);
 149                 free(state);
 150
 151                 memset(&regs2, 0, sizeof(regs2));
 152                 vcpu_regs_get(vm, VCPU_ID, &regs2);
 153                 TEST_ASSERT(!memcmp(&regs1, &regs2, sizeof(regs2)),
 154                             "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
 155                             (ulong) regs2.rdi, (ulong) regs2.rsi);
 156         }
 157
 158 part1_done:
 159         _vcpu_run(vm, VCPU_ID);
 160         TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
 161                     "Unexpected successful VMEnter with invalid eVMCS pointer!");
 162
 163         kvm_vm_free(vm);
 164 }