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
15static void l2_guest_code(struct svm_test_data *svm)
16{
17	__asm__ __volatile__("vmcall");
18}
19
20static 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
36int 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	}
67done:
68	kvm_vm_free(vm);
69	return 0;
70}