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(run->exit_reason == KVM_EXIT_IO,
68 			    "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
69 			    run->exit_reason,
70 			    exit_reason_str(run->exit_reason));
71 
72 		if (run->io.port == PORT_L0_EXIT)
73 			break;
74 
75 		switch (get_ucall(vcpu, &uc)) {
76 		case UCALL_ABORT:
77 			REPORT_GUEST_ASSERT(uc);
78 			/* NOT REACHED */
79 		default:
80 			TEST_FAIL("Unknown ucall %lu", uc.cmd);
81 		}
82 	}
83 }
84