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 }
71
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