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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * svm_vmcall_test
   4 *
   5 * Copyright (C) 2020, Red Hat, Inc.
   6 *
   7 * Nested SVM testing: VMCALL
   8 */
   9
  10#include "test_util.h"
  11#include "kvm_util.h"
  12#include "processor.h"
  13#include "svm_util.h"
  14
  15#define VCPU_ID         5
  16
  17static struct kvm_vm *vm;
  18
  19static void l2_guest_code(struct svm_test_data *svm)
  20{
  21        __asm__ __volatile__("vmcall");
  22}
  23
  24static void l1_guest_code(struct svm_test_data *svm)
  25{
  26        #define L2_GUEST_STACK_SIZE 64
  27        unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
  28        struct vmcb *vmcb = svm->vmcb;
  29
  30        /* Prepare for L2 execution. */
  31        generic_svm_setup(svm, l2_guest_code,
  32                          &l2_guest_stack[L2_GUEST_STACK_SIZE]);
  33
  34        run_guest(vmcb, svm->vmcb_gpa);
  35
  36        GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
  37        GUEST_DONE();
  38}
  39
  40int main(int argc, char *argv[])
  41{
  42        vm_vaddr_t svm_gva;
  43
  44        nested_svm_check_supported();
  45
  46        vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
  47
  48        vcpu_alloc_svm(vm, &svm_gva);
  49        vcpu_args_set(vm, VCPU_ID, 1, svm_gva);
  50
  51        for (;;) {
  52                volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
  53                struct ucall uc;
  54
  55                vcpu_run(vm, VCPU_ID);
  56                TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
  57                            "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
  58                            run->exit_reason,
  59                            exit_reason_str(run->exit_reason));
  60
  61                switch (get_ucall(vm, VCPU_ID, &uc)) {
  62                case UCALL_ABORT:
  63                        TEST_FAIL("%s", (const char *)uc.args[0]);
  64                        /* NOT REACHED */
  65                case UCALL_SYNC:
  66                        break;
  67                case UCALL_DONE:
  68                        goto done;
  69                default:
  70                        TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
  71                }
  72        }
  73done:
  74        kvm_vm_free(vm);
  75        return 0;
  76}
  77