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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2018, Red Hat, Inc.
4  *
5  * Tests for Enlightened VMCS, including nested guest state.
6  */
7 #define _GNU_SOURCE /* for program_invocation_short_name */
8 #include <fcntl.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <sys/ioctl.h>
13 
14 #include "test_util.h"
15 
16 #include "kvm_util.h"
17 
18 #include "vmx.h"
19 
20 #define VCPU_ID		5
21 
l2_guest_code(void)22 void l2_guest_code(void)
23 {
24 	GUEST_SYNC(7);
25 
26 	GUEST_SYNC(8);
27 
28 	/* Done, exit to L1 and never come back.  */
29 	vmcall();
30 }
31 
l1_guest_code(struct vmx_pages * vmx_pages)32 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 	enable_vp_assist(vmx_pages->vp_assist_gpa, vmx_pages->vp_assist);
38 
39 	GUEST_ASSERT(vmx_pages->vmcs_gpa);
40 	GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
41 	GUEST_SYNC(3);
42 	GUEST_ASSERT(load_vmcs(vmx_pages));
43 	GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
44 
45 	GUEST_SYNC(4);
46 	GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
47 
48 	prepare_vmcs(vmx_pages, l2_guest_code,
49 		     &l2_guest_stack[L2_GUEST_STACK_SIZE]);
50 
51 	GUEST_SYNC(5);
52 	GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
53 	current_evmcs->revision_id = -1u;
54 	GUEST_ASSERT(vmlaunch());
55 	current_evmcs->revision_id = EVMCS_VERSION;
56 	GUEST_SYNC(6);
57 
58 	GUEST_ASSERT(!vmlaunch());
59 	GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
60 	GUEST_SYNC(9);
61 	GUEST_ASSERT(!vmresume());
62 	GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
63 	GUEST_SYNC(10);
64 }
65 
guest_code(struct vmx_pages * vmx_pages)66 void guest_code(struct vmx_pages *vmx_pages)
67 {
68 	GUEST_SYNC(1);
69 	GUEST_SYNC(2);
70 
71 	if (vmx_pages)
72 		l1_guest_code(vmx_pages);
73 
74 	GUEST_DONE();
75 
76 	/* Try enlightened vmptrld with an incorrect GPA */
77 	evmcs_vmptrld(0xdeadbeef, vmx_pages->enlightened_vmcs);
78 	GUEST_ASSERT(vmlaunch());
79 }
80 
main(int argc,char * argv[])81 int main(int argc, char *argv[])
82 {
83 	vm_vaddr_t vmx_pages_gva = 0;
84 
85 	struct kvm_regs regs1, regs2;
86 	struct kvm_vm *vm;
87 	struct kvm_run *run;
88 	struct kvm_x86_state *state;
89 	struct ucall uc;
90 	int stage;
91 
92 	/* Create VM */
93 	vm = vm_create_default(VCPU_ID, 0, guest_code);
94 
95 	vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
96 
97 	if (!nested_vmx_supported() ||
98 	    !kvm_check_cap(KVM_CAP_NESTED_STATE) ||
99 	    !kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
100 		print_skip("Enlightened VMCS is unsupported");
101 		exit(KSFT_SKIP);
102 	}
103 
104 	vcpu_enable_evmcs(vm, VCPU_ID);
105 
106 	run = vcpu_state(vm, VCPU_ID);
107 
108 	vcpu_regs_get(vm, VCPU_ID, &regs1);
109 
110 	vcpu_alloc_vmx(vm, &vmx_pages_gva);
111 	vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
112 
113 	for (stage = 1;; stage++) {
114 		_vcpu_run(vm, VCPU_ID);
115 		TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
116 			    "Stage %d: unexpected exit reason: %u (%s),\n",
117 			    stage, run->exit_reason,
118 			    exit_reason_str(run->exit_reason));
119 
120 		switch (get_ucall(vm, VCPU_ID, &uc)) {
121 		case UCALL_ABORT:
122 			TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0],
123 		      		  __FILE__, uc.args[1]);
124 			/* NOT REACHED */
125 		case UCALL_SYNC:
126 			break;
127 		case UCALL_DONE:
128 			goto part1_done;
129 		default:
130 			TEST_FAIL("Unknown ucall %lu", uc.cmd);
131 		}
132 
133 		/* UCALL_SYNC is handled here.  */
134 		TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
135 			    uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
136 			    stage, (ulong)uc.args[1]);
137 
138 		state = vcpu_save_state(vm, VCPU_ID);
139 		memset(&regs1, 0, sizeof(regs1));
140 		vcpu_regs_get(vm, VCPU_ID, &regs1);
141 
142 		kvm_vm_release(vm);
143 
144 		/* Restore state in a new VM.  */
145 		kvm_vm_restart(vm, O_RDWR);
146 		vm_vcpu_add(vm, VCPU_ID);
147 		vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
148 		vcpu_enable_evmcs(vm, VCPU_ID);
149 		vcpu_load_state(vm, VCPU_ID, state);
150 		run = vcpu_state(vm, VCPU_ID);
151 		free(state);
152 
153 		memset(&regs2, 0, sizeof(regs2));
154 		vcpu_regs_get(vm, VCPU_ID, &regs2);
155 		TEST_ASSERT(!memcmp(&regs1, &regs2, sizeof(regs2)),
156 			    "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
157 			    (ulong) regs2.rdi, (ulong) regs2.rsi);
158 	}
159 
160 part1_done:
161 	_vcpu_run(vm, VCPU_ID);
162 	TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
163 		    "Unexpected successful VMEnter with invalid eVMCS pointer!");
164 
165 	kvm_vm_free(vm);
166 }
167