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

   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
  17 static struct kvm_vm *vm;
  18
  19 static void l2_guest_code(struct svm_test_data *svm)
  20 {
  21         __asm__ __volatile__("vmcall");
  22 }
  23
  24 static 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
  40 int 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         }
  73 done:
  74         kvm_vm_free(vm);
  75         return 0;
  76 }