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 enum {
22 PORT_L0_EXIT = 0x2000,
23 };
24
l2_guest_code(void)25 static void l2_guest_code(void)
26 {
27 /* Exit to L0 */
28 asm volatile("inb %%dx, %%al"
29 : : [port] "d" (PORT_L0_EXIT) : "rax");
30 }
31
l1_guest_code(struct vmx_pages * vmx_pages)32 static void l1_guest_code(struct vmx_pages *vmx_pages)
33 {
34 #define L2_GUEST_STACK_SIZE 64
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
main(int argc,char * argv[])48 int main(int argc, char *argv[])
49 {
50 vm_vaddr_t vmx_pages_gva;
51 struct kvm_vcpu *vcpu;
52 struct kvm_vm *vm;
53
54 TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX));
55
56 vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
57
58 /* Allocate VMX pages and shared descriptors (vmx_pages). */
59 vcpu_alloc_vmx(vm, &vmx_pages_gva);
60 vcpu_args_set(vcpu, 1, vmx_pages_gva);
61
62 for (;;) {
63 volatile struct kvm_run *run = vcpu->run;
64 struct ucall uc;
65
66 vcpu_run(vcpu);
67 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
68
69 if (run->io.port == PORT_L0_EXIT)
70 break;
71
72 switch (get_ucall(vcpu, &uc)) {
73 case UCALL_ABORT:
74 REPORT_GUEST_ASSERT(uc);
75 /* NOT REACHED */
76 default:
77 TEST_FAIL("Unknown ucall %lu", uc.cmd);
78 }
79 }
80 }
81