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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * svm_nested_shutdown_test
   4  *
   5  * Copyright (C) 2022, Red Hat, Inc.
   6  *
   7  * Nested SVM testing: test that unintercepted shutdown in L2 doesn't crash the host
   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__("ud2");
  18 }
  19
  20 static void l1_guest_code(struct svm_test_data *svm, struct idt_entry *idt)
  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         generic_svm_setup(svm, l2_guest_code,
  27                           &l2_guest_stack[L2_GUEST_STACK_SIZE]);
  28
  29         vmcb->control.intercept &= ~(BIT(INTERCEPT_SHUTDOWN));
  30
  31         idt[6].p   = 0; // #UD is intercepted but its injection will cause #NP
  32         idt[11].p  = 0; // #NP is not intercepted and will cause another
  33                         // #NP that will be converted to #DF
  34         idt[8].p   = 0; // #DF will cause #NP which will cause SHUTDOWN
  35
  36         run_guest(vmcb, svm->vmcb_gpa);
  37
  38         /* should not reach here */
  39         GUEST_ASSERT(0);
  40 }
  41
  42 int main(int argc, char *argv[])
  43 {
  44         struct kvm_vcpu *vcpu;
  45         vm_vaddr_t svm_gva;
  46         struct kvm_vm *vm;
  47
  48         TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
  49
  50         vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
  51         vcpu_alloc_svm(vm, &svm_gva);
  52
  53         vcpu_args_set(vcpu, 2, svm_gva, vm->arch.idt);
  54
  55         vcpu_run(vcpu);
  56         TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_SHUTDOWN);
  57
  58         kvm_vm_free(vm);
  59 }