Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2019, Red Hat, Inc.
4 *
5 * Verify that nothing bad happens if a KVM user exits with open
6 * file descriptors while executing a nested guest.
7 */
8
9#include "test_util.h"
10#include "kvm_util.h"
11#include "processor.h"
12#include "vmx.h"
13#include "svm_util.h"
14
15#include <string.h>
16#include <sys/ioctl.h>
17
18#include "kselftest.h"
19
20enum {
21 PORT_L0_EXIT = 0x2000,
22};
23
24#define L2_GUEST_STACK_SIZE 64
25
26static void l2_guest_code(void)
27{
28 /* Exit to L0 */
29 asm volatile("inb %%dx, %%al"
30 : : [port] "d" (PORT_L0_EXIT) : "rax");
31}
32
33static void l1_vmx_code(struct vmx_pages *vmx_pages)
34{
35 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
36
37 GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
38 GUEST_ASSERT(load_vmcs(vmx_pages));
39
40 /* Prepare the VMCS for L2 execution. */
41 prepare_vmcs(vmx_pages, l2_guest_code,
42 &l2_guest_stack[L2_GUEST_STACK_SIZE]);
43
44 GUEST_ASSERT(!vmlaunch());
45 GUEST_ASSERT(0);
46}
47
48static void l1_svm_code(struct svm_test_data *svm)
49{
50 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
51
52 /* Prepare the VMCB for L2 execution. */
53 generic_svm_setup(svm, l2_guest_code,
54 &l2_guest_stack[L2_GUEST_STACK_SIZE]);
55
56 run_guest(svm->vmcb, svm->vmcb_gpa);
57 GUEST_ASSERT(0);
58}
59
60static void l1_guest_code(void *data)
61{
62 if (this_cpu_has(X86_FEATURE_VMX))
63 l1_vmx_code(data);
64 else
65 l1_svm_code(data);
66}
67
68int main(int argc, char *argv[])
69{
70 gva_t guest_gva;
71 struct kvm_vcpu *vcpu;
72 struct kvm_vm *vm;
73
74 TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX) ||
75 kvm_cpu_has(X86_FEATURE_SVM));
76
77 vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
78
79 if (kvm_cpu_has(X86_FEATURE_VMX))
80 vcpu_alloc_vmx(vm, &guest_gva);
81 else
82 vcpu_alloc_svm(vm, &guest_gva);
83
84 vcpu_args_set(vcpu, 1, guest_gva);
85
86 for (;;) {
87 volatile struct kvm_run *run = vcpu->run;
88 struct ucall uc;
89
90 vcpu_run(vcpu);
91 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
92
93 if (run->io.port == PORT_L0_EXIT)
94 break;
95
96 switch (get_ucall(vcpu, &uc)) {
97 case UCALL_ABORT:
98 REPORT_GUEST_ASSERT(uc);
99 /* NOT REACHED */
100 default:
101 TEST_FAIL("Unknown ucall %lu", uc.cmd);
102 }
103 }
104}