LXR linux/tools/testing/selftests/kvm/x86_64/evmcs

   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
  22void 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
  32void 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
  61void 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
  72int 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
  83        /* Create VM */
  84        vm = vm_create_default(VCPU_ID, 0, guest_code);
  85
  86        vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
  87
  88        if (!kvm_check_cap(KVM_CAP_NESTED_STATE) ||
  89            !kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
  90                printf("capabilities not available, skipping test\n");
  91                exit(KSFT_SKIP);
  92        }
  93
  94        vcpu_enable_evmcs(vm, VCPU_ID);
  95
  96        run = vcpu_state(vm, VCPU_ID);
  97
  98        vcpu_regs_get(vm, VCPU_ID, &regs1);
  99
 100        vcpu_alloc_vmx(vm, &vmx_pages_gva);
 101        vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
 102
 103        for (stage = 1;; stage++) {
 104                _vcpu_run(vm, VCPU_ID);
 105                TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 106                            "Stage %d: unexpected exit reason: %u (%s),\n",
 107                            stage, run->exit_reason,
 108                            exit_reason_str(run->exit_reason));
 109
 110                switch (get_ucall(vm, VCPU_ID, &uc)) {
 111                case UCALL_ABORT:
 112                        TEST_ASSERT(false, "%s at %s:%d", (const char *)uc.args[0],
 113                                    __FILE__, uc.args[1]);
 114                        /* NOT REACHED */
 115                case UCALL_SYNC:
 116                        break;
 117                case UCALL_DONE:
 118                        goto done;
 119                default:
 120                        TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
 121                }
 122
 123                /* UCALL_SYNC is handled here.  */
 124                TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
 125                            uc.args[1] == stage, "Unexpected register values vmexit #%lx, got %lx",
 126                            stage, (ulong)uc.args[1]);
 127
 128                state = vcpu_save_state(vm, VCPU_ID);
 129                memset(&regs1, 0, sizeof(regs1));
 130                vcpu_regs_get(vm, VCPU_ID, &regs1);
 131
 132                kvm_vm_release(vm);
 133
 134                /* Restore state in a new VM.  */
 135                kvm_vm_restart(vm, O_RDWR);
 136                vm_vcpu_add(vm, VCPU_ID);
 137                vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
 138                vcpu_enable_evmcs(vm, VCPU_ID);
 139                vcpu_load_state(vm, VCPU_ID, state);
 140                run = vcpu_state(vm, VCPU_ID);
 141                free(state);
 142
 143                memset(&regs2, 0, sizeof(regs2));
 144                vcpu_regs_get(vm, VCPU_ID, &regs2);
 145                TEST_ASSERT(!memcmp(&regs1, &regs2, sizeof(regs2)),
 146                            "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
 147                            (ulong) regs2.rdi, (ulong) regs2.rsi);
 148        }
 149
 150done:
 151        kvm_vm_free(vm);
 152}
 153