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 
l2_guest_code(struct svm_test_data * svm)15 static void l2_guest_code(struct svm_test_data *svm)
16 {
17 	__asm__ __volatile__("ud2");
18 }
19 
l1_guest_code(struct svm_test_data * svm,struct idt_entry * idt)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 
main(int argc,char * argv[])42 int main(int argc, char *argv[])
43 {
44 	struct kvm_vcpu *vcpu;
45 	struct kvm_run *run;
46 	vm_vaddr_t svm_gva;
47 	struct kvm_vm *vm;
48 
49 	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
50 
51 	vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
52 	vm_init_descriptor_tables(vm);
53 	vcpu_init_descriptor_tables(vcpu);
54 
55 	vcpu_alloc_svm(vm, &svm_gva);
56 
57 	vcpu_args_set(vcpu, 2, svm_gva, vm->idt);
58 	run = vcpu->run;
59 
60 	vcpu_run(vcpu);
61 	TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
62 		    "Got exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n",
63 		    run->exit_reason,
64 		    exit_reason_str(run->exit_reason));
65 
66 	kvm_vm_free(vm);
67 }
68