1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * vmx_close_while_nested
4 *
5 * Copyright (C) 2019, Red Hat, Inc.
6 *
7 * Verify that nothing bad happens if a KVM user exits with open
8 * file descriptors while executing a nested guest.
9 */
10
11 #include "test_util.h"
12 #include "kvm_util.h"
13 #include "processor.h"
14 #include "vmx.h"
15
16 #include <string.h>
17 #include <sys/ioctl.h>
18
19 #include "kselftest.h"
20
21 #define VCPU_ID 5
22
23 enum {
24 PORT_L0_EXIT = 0x2000,
25 };
26
27 /* The virtual machine object. */
28 static struct kvm_vm *vm;
29
l2_guest_code(void)30 static void l2_guest_code(void)
31 {
32 /* Exit to L0 */
33 asm volatile("inb %%dx, %%al"
34 : : [port] "d" (PORT_L0_EXIT) : "rax");
35 }
36
l1_guest_code(struct vmx_pages * vmx_pages)37 static void l1_guest_code(struct vmx_pages *vmx_pages)
38 {
39 #define L2_GUEST_STACK_SIZE 64
40 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
41
42 GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
43 GUEST_ASSERT(load_vmcs(vmx_pages));
44
45 /* Prepare the VMCS for L2 execution. */
46 prepare_vmcs(vmx_pages, l2_guest_code,
47 &l2_guest_stack[L2_GUEST_STACK_SIZE]);
48
49 GUEST_ASSERT(!vmlaunch());
50 GUEST_ASSERT(0);
51 }
52
main(int argc,char * argv[])53 int main(int argc, char *argv[])
54 {
55 vm_vaddr_t vmx_pages_gva;
56
57 nested_vmx_check_supported();
58
59 vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
60 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
61
62 /* Allocate VMX pages and shared descriptors (vmx_pages). */
63 vcpu_alloc_vmx(vm, &vmx_pages_gva);
64 vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
65
66 for (;;) {
67 volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
68 struct ucall uc;
69
70 vcpu_run(vm, VCPU_ID);
71 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
72 "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
73 run->exit_reason,
74 exit_reason_str(run->exit_reason));
75
76 if (run->io.port == PORT_L0_EXIT)
77 break;
78
79 switch (get_ucall(vm, VCPU_ID, &uc)) {
80 case UCALL_ABORT:
81 TEST_ASSERT(false, "%s", (const char *)uc.args[0]);
82 /* NOT REACHED */
83 default:
84 TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
85 }
86 }
87 }
88