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 static void l2_guest_code(struct svm_test_data *svm)
  16 {
  17         __asm__ __volatile__("vmcall");
  18 }
  19
  20 static void l1_guest_code(struct svm_test_data *svm)
  21 {
  22         #define L2_GUEST_STACK_SIZE 64
  23         unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
  24         struct vmcb *vmcb = svm->vmcb;
  25
  26         /* Prepare for L2 execution. */
  27         generic_svm_setup(svm, l2_guest_code,
  28                           &l2_guest_stack[L2_GUEST_STACK_SIZE]);
  29
  30         run_guest(vmcb, svm->vmcb_gpa);
  31
  32         GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
  33         GUEST_DONE();
  34 }
  35
  36 int main(int argc, char *argv[])
  37 {
  38         struct kvm_vcpu *vcpu;
  39         vm_vaddr_t svm_gva;
  40         struct kvm_vm *vm;
  41
  42         TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
  43
  44         vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
  45
  46         vcpu_alloc_svm(vm, &svm_gva);
  47         vcpu_args_set(vcpu, 1, svm_gva);
  48
  49         for (;;) {
  50                 struct ucall uc;
  51
  52                 vcpu_run(vcpu);
  53                 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
  54
  55                 switch (get_ucall(vcpu, &uc)) {
  56                 case UCALL_ABORT:
  57                         REPORT_GUEST_ASSERT(uc);
  58                         /* NOT REACHED */
  59                 case UCALL_SYNC:
  60                         break;
  61                 case UCALL_DONE:
  62                         goto done;
  63                 default:
  64                         TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
  65                 }
  66         }
  67 done:
  68         kvm_vm_free(vm);
  69         return 0;
  70 }