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
15static void l2_guest_code(struct svm_test_data *svm)
16{
17	__asm__ __volatile__("ud2");
18}
19
20static 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
42int 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}