1/*-
2 * Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c 271346 2014-09-10 02:35:19Z neel $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/cpuset.h>
33
34#include <machine/segments.h>
35#include <machine/specialreg.h>
36#include <machine/vmm.h>
37
38#include "vmcb.h"
39#include "svm.h"
40
41/*
42 * The VMCB aka Virtual Machine Control Block is a 4KB aligned page
43 * in memory that describes the virtual machine.
44 *
45 * The VMCB contains:
46 * - instructions or events in the guest to intercept
47 * - control bits that modify execution environment of the guest
48 * - guest processor state (e.g. general purpose registers)
49 */
50
51/*
52 * Read from segment selector, control and general purpose register of VMCB.
53 */
54int
55vmcb_read(struct vmcb *vmcb, int ident, uint64_t *retval)
56{
57 struct vmcb_state *state;
58 struct vmcb_segment *seg;
59 int err;
60
61 state = &vmcb->state;
62 err = 0;
63
64 switch (ident) {
65 case VM_REG_GUEST_CR0:
66 *retval = state->cr0;
67 break;
68

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103 break;
104
105 case VM_REG_GUEST_CS:
106 case VM_REG_GUEST_DS:
107 case VM_REG_GUEST_ES:
108 case VM_REG_GUEST_FS:
109 case VM_REG_GUEST_GS:
110 case VM_REG_GUEST_SS:
111 case VM_REG_GUEST_GDTR:
112 case VM_REG_GUEST_IDTR:
113 case VM_REG_GUEST_LDTR:
114 case VM_REG_GUEST_TR:
115 seg = vmcb_seg(vmcb, ident);
116 if (seg == NULL) {
117 ERR("Invalid seg type %d\n", ident);
118 err = EINVAL;
119 break;
120 }
121
122 *retval = seg->selector;
123 break;
124
125 default:
126 err = EINVAL;
127 break;
128 }
129
130 return (err);
131}
132
133/*
134 * Write to segment selector, control and general purpose register of VMCB.
135 */
136int
137vmcb_write(struct vmcb *vmcb, int ident, uint64_t val)
138{
139 struct vmcb_state *state;
140 struct vmcb_segment *seg;
141 int err;
142
143 state = &vmcb->state;
144 err = 0;
145
146 switch (ident) {
147 case VM_REG_GUEST_CR0:
148 state->cr0 = val;
149 break;
150
151 case VM_REG_GUEST_CR2:
152 state->cr2 = val;
153 break;
154
155 case VM_REG_GUEST_CR3:
156 state->cr3 = val;
157 break;
158
159 case VM_REG_GUEST_CR4:
160 state->cr4 = val;
161 break;
162
163 case VM_REG_GUEST_DR7:
164 state->dr7 = val;
165 break;
166
167 case VM_REG_GUEST_EFER:
168 /* EFER_SVM must always be set when the guest is executing */
169 state->efer = val | EFER_SVM;
170 break;
171
172 case VM_REG_GUEST_RAX:
173 state->rax = val;
174 break;
175
176 case VM_REG_GUEST_RFLAGS:
177 state->rflags = val;

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183
184 case VM_REG_GUEST_RSP:
185 state->rsp = val;
186 break;
187
188 case VM_REG_GUEST_CS:
189 case VM_REG_GUEST_DS:
190 case VM_REG_GUEST_ES:
191 case VM_REG_GUEST_FS:
192 case VM_REG_GUEST_GS:
193 case VM_REG_GUEST_SS:
194 case VM_REG_GUEST_GDTR:
195 case VM_REG_GUEST_IDTR:
196 case VM_REG_GUEST_LDTR:
197 case VM_REG_GUEST_TR:
198 seg = vmcb_seg(vmcb, ident);
199 if (seg == NULL) {
200 ERR("Invalid segment type %d\n", ident);
201 err = EINVAL;
202 break;
203 }
204
205 seg->selector = val;
206 break;
207
208 default:
209 err = EINVAL;
210 }
211
212 return (err);
213}
214
215/*
216 * Return VMCB segment area.
217 */
218struct vmcb_segment *
219vmcb_seg(struct vmcb *vmcb, int type)
220{
221 struct vmcb_state *state;
222 struct vmcb_segment *seg;
223
224 state = &vmcb->state;
225
226 switch (type) {
227 case VM_REG_GUEST_CS:
228 seg = &state->cs;
229 break;
230
231 case VM_REG_GUEST_DS:
232 seg = &state->ds;
233 break;
234
235 case VM_REG_GUEST_ES:
236 seg = &state->es;
237 break;
238
239 case VM_REG_GUEST_FS:
240 seg = &state->fs;
241 break;
242
243 case VM_REG_GUEST_GS:
244 seg = &state->gs;
245 break;
246
247 case VM_REG_GUEST_SS:
248 seg = &state->ss;
249 break;
250
251 case VM_REG_GUEST_GDTR:
252 seg = &state->gdt;
253 break;
254
255 case VM_REG_GUEST_IDTR:
256 seg = &state->idt;
257 break;
258
259 case VM_REG_GUEST_LDTR:
260 seg = &state->ldt;
261 break;
262
263 case VM_REG_GUEST_TR:
264 seg = &state->tr;
265 break;
266
267 default:
268 seg = NULL;
269 break;
270 }
271
272 return (seg);
273}