1 /*
2 * Copyright (C) 2015 Mihai Carabas <mihai.carabas@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
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #ifndef _VMM_H_
28 #define _VMM_H_
29
30 #include <sys/param.h>
31 #include <sys/cpuset.h>
32 #include <vm/vm.h>
33 #include <vm/pmap.h>
34
35 #include "pte.h"
36 #include "pmap.h"
37
38 struct vcpu;
39
40 enum vm_suspend_how {
41 VM_SUSPEND_NONE,
42 VM_SUSPEND_RESET,
43 VM_SUSPEND_POWEROFF,
44 VM_SUSPEND_HALT,
45 VM_SUSPEND_DESTROY,
46 VM_SUSPEND_LAST
47 };
48
49 /*
50 * Identifiers for architecturally defined registers.
51 */
52 enum vm_reg_name {
53 VM_REG_GUEST_X0 = 0,
54 VM_REG_GUEST_X1,
55 VM_REG_GUEST_X2,
56 VM_REG_GUEST_X3,
57 VM_REG_GUEST_X4,
58 VM_REG_GUEST_X5,
59 VM_REG_GUEST_X6,
60 VM_REG_GUEST_X7,
61 VM_REG_GUEST_X8,
62 VM_REG_GUEST_X9,
63 VM_REG_GUEST_X10,
64 VM_REG_GUEST_X11,
65 VM_REG_GUEST_X12,
66 VM_REG_GUEST_X13,
67 VM_REG_GUEST_X14,
68 VM_REG_GUEST_X15,
69 VM_REG_GUEST_X16,
70 VM_REG_GUEST_X17,
71 VM_REG_GUEST_X18,
72 VM_REG_GUEST_X19,
73 VM_REG_GUEST_X20,
74 VM_REG_GUEST_X21,
75 VM_REG_GUEST_X22,
76 VM_REG_GUEST_X23,
77 VM_REG_GUEST_X24,
78 VM_REG_GUEST_X25,
79 VM_REG_GUEST_X26,
80 VM_REG_GUEST_X27,
81 VM_REG_GUEST_X28,
82 VM_REG_GUEST_X29,
83 VM_REG_GUEST_LR,
84 VM_REG_GUEST_SP,
85 VM_REG_GUEST_PC,
86 VM_REG_GUEST_CPSR,
87
88 VM_REG_GUEST_SCTLR_EL1,
89 VM_REG_GUEST_TTBR0_EL1,
90 VM_REG_GUEST_TTBR1_EL1,
91 VM_REG_GUEST_TCR_EL1,
92 VM_REG_GUEST_TCR2_EL1,
93 VM_REG_GUEST_MPIDR_EL1,
94 VM_REG_LAST
95 };
96
97 #define VM_INTINFO_VECTOR(info) ((info) & 0xff)
98 #define VM_INTINFO_DEL_ERRCODE 0x800
99 #define VM_INTINFO_RSVD 0x7ffff000
100 #define VM_INTINFO_VALID 0x80000000
101 #define VM_INTINFO_TYPE 0x700
102 #define VM_INTINFO_HWINTR (0 << 8)
103 #define VM_INTINFO_NMI (2 << 8)
104 #define VM_INTINFO_HWEXCEPTION (3 << 8)
105 #define VM_INTINFO_SWINTR (4 << 8)
106
107 #define VM_GUEST_BASE_IPA 0x80000000UL /* Guest kernel start ipa */
108
109 /*
110 * The VM name has to fit into the pathname length constraints of devfs,
111 * governed primarily by SPECNAMELEN. The length is the total number of
112 * characters in the full path, relative to the mount point and not
113 * including any leading '/' characters.
114 * A prefix and a suffix are added to the name specified by the user.
115 * The prefix is usually "vmm/" or "vmm.io/", but can be a few characters
116 * longer for future use.
117 * The suffix is a string that identifies a bootrom image or some similar
118 * image that is attached to the VM. A separator character gets added to
119 * the suffix automatically when generating the full path, so it must be
120 * accounted for, reducing the effective length by 1.
121 * The effective length of a VM name is 229 bytes for FreeBSD 13 and 37
122 * bytes for FreeBSD 12. A minimum length is set for safety and supports
123 * a SPECNAMELEN as small as 32 on old systems.
124 */
125 #define VM_MAX_PREFIXLEN 10
126 #define VM_MAX_SUFFIXLEN 15
127 #define VM_MAX_NAMELEN \
128 (SPECNAMELEN - VM_MAX_PREFIXLEN - VM_MAX_SUFFIXLEN - 1)
129
130 #ifdef _KERNEL
131 struct vm;
132 struct vm_exception;
133 struct vm_exit;
134 struct vm_run;
135 struct vm_object;
136 struct vm_guest_paging;
137 struct vm_vgic_descr;
138 struct pmap;
139
140 struct vm_eventinfo {
141 void *rptr; /* rendezvous cookie */
142 int *sptr; /* suspend cookie */
143 int *iptr; /* reqidle cookie */
144 };
145
146 int vm_create(const char *name, struct vm **retvm);
147 struct vcpu *vm_alloc_vcpu(struct vm *vm, int vcpuid);
148 void vm_disable_vcpu_creation(struct vm *vm);
149 void vm_slock_vcpus(struct vm *vm);
150 void vm_unlock_vcpus(struct vm *vm);
151 void vm_destroy(struct vm *vm);
152 int vm_reinit(struct vm *vm);
153 const char *vm_name(struct vm *vm);
154
155 uint16_t vm_get_maxcpus(struct vm *vm);
156 void vm_get_topology(struct vm *vm, uint16_t *sockets, uint16_t *cores,
157 uint16_t *threads, uint16_t *maxcpus);
158 int vm_set_topology(struct vm *vm, uint16_t sockets, uint16_t cores,
159 uint16_t threads, uint16_t maxcpus);
160 int vm_get_register(struct vcpu *vcpu, int reg, uint64_t *retval);
161 int vm_set_register(struct vcpu *vcpu, int reg, uint64_t val);
162 int vm_run(struct vcpu *vcpu);
163 int vm_suspend(struct vm *vm, enum vm_suspend_how how);
164 void* vm_get_cookie(struct vm *vm);
165 int vcpu_vcpuid(struct vcpu *vcpu);
166 void *vcpu_get_cookie(struct vcpu *vcpu);
167 struct vm *vcpu_vm(struct vcpu *vcpu);
168 struct vcpu *vm_vcpu(struct vm *vm, int cpu);
169 int vm_get_capability(struct vcpu *vcpu, int type, int *val);
170 int vm_set_capability(struct vcpu *vcpu, int type, int val);
171 int vm_activate_cpu(struct vcpu *vcpu);
172 int vm_suspend_cpu(struct vm *vm, struct vcpu *vcpu);
173 int vm_resume_cpu(struct vm *vm, struct vcpu *vcpu);
174 int vm_inject_exception(struct vcpu *vcpu, uint64_t esr, uint64_t far);
175 int vm_attach_vgic(struct vm *vm, struct vm_vgic_descr *descr);
176 int vm_assert_irq(struct vm *vm, uint32_t irq);
177 int vm_deassert_irq(struct vm *vm, uint32_t irq);
178 int vm_raise_msi(struct vm *vm, uint64_t msg, uint64_t addr, int bus, int slot,
179 int func);
180 struct vm_exit *vm_exitinfo(struct vcpu *vcpu);
181 void vm_exit_suspended(struct vcpu *vcpu, uint64_t pc);
182 void vm_exit_debug(struct vcpu *vcpu, uint64_t pc);
183 void vm_exit_rendezvous(struct vcpu *vcpu, uint64_t pc);
184 void vm_exit_astpending(struct vcpu *vcpu, uint64_t pc);
185
186 cpuset_t vm_active_cpus(struct vm *vm);
187 cpuset_t vm_debug_cpus(struct vm *vm);
188 cpuset_t vm_suspended_cpus(struct vm *vm);
189
190 static __inline int
vcpu_rendezvous_pending(struct vm_eventinfo * info)191 vcpu_rendezvous_pending(struct vm_eventinfo *info)
192 {
193
194 return (*((uintptr_t *)(info->rptr)) != 0);
195 }
196
197 static __inline int
vcpu_suspended(struct vm_eventinfo * info)198 vcpu_suspended(struct vm_eventinfo *info)
199 {
200
201 return (*info->sptr);
202 }
203
204 int vcpu_debugged(struct vcpu *vcpu);
205
206 enum vcpu_state {
207 VCPU_IDLE,
208 VCPU_FROZEN,
209 VCPU_RUNNING,
210 VCPU_SLEEPING,
211 };
212
213 int vcpu_set_state(struct vcpu *vcpu, enum vcpu_state state, bool from_idle);
214 enum vcpu_state vcpu_get_state(struct vcpu *vcpu, int *hostcpu);
215
216 static int __inline
vcpu_is_running(struct vcpu * vcpu,int * hostcpu)217 vcpu_is_running(struct vcpu *vcpu, int *hostcpu)
218 {
219 return (vcpu_get_state(vcpu, hostcpu) == VCPU_RUNNING);
220 }
221
222 #ifdef _SYS_PROC_H_
223 static int __inline
vcpu_should_yield(struct vcpu * vcpu)224 vcpu_should_yield(struct vcpu *vcpu)
225 {
226 struct thread *td;
227
228 td = curthread;
229 return (td->td_ast != 0 || td->td_owepreempt != 0);
230 }
231 #endif
232
233 void *vcpu_stats(struct vcpu *vcpu);
234 void vcpu_notify_event(struct vcpu *vcpu);
235 struct vmspace *vm_vmspace(struct vm *vm);
236 struct vm_mem *vm_mem(struct vm *vm);
237
238 enum vm_reg_name vm_segment_name(int seg_encoding);
239
240 struct vm_copyinfo {
241 uint64_t gpa;
242 size_t len;
243 void *hva;
244 void *cookie;
245 };
246
247 #endif /* _KERNEL */
248
249 #define VM_DIR_READ 0
250 #define VM_DIR_WRITE 1
251
252 #define VM_GP_M_MASK 0x1f
253 #define VM_GP_MMU_ENABLED (1 << 5)
254
255 struct vm_guest_paging {
256 uint64_t ttbr0_addr;
257 uint64_t ttbr1_addr;
258 uint64_t tcr_el1;
259 uint64_t tcr2_el1;
260 int flags;
261 int padding;
262 };
263
264 struct vie {
265 uint8_t access_size:4, sign_extend:1, dir:1, unused:2;
266 enum vm_reg_name reg;
267 };
268
269 struct vre {
270 uint32_t inst_syndrome;
271 uint8_t dir:1, unused:7;
272 enum vm_reg_name reg;
273 };
274
275 /*
276 * Identifiers for optional vmm capabilities
277 */
278 enum vm_cap_type {
279 VM_CAP_HALT_EXIT,
280 VM_CAP_PAUSE_EXIT,
281 VM_CAP_UNRESTRICTED_GUEST,
282 VM_CAP_BRK_EXIT,
283 VM_CAP_SS_EXIT,
284 VM_CAP_MASK_HWINTR,
285 VM_CAP_MAX
286 };
287
288 enum vm_exitcode {
289 VM_EXITCODE_BOGUS,
290 VM_EXITCODE_INST_EMUL,
291 VM_EXITCODE_REG_EMUL,
292 VM_EXITCODE_HVC,
293 VM_EXITCODE_SUSPENDED,
294 VM_EXITCODE_HYP,
295 VM_EXITCODE_WFI,
296 VM_EXITCODE_PAGING,
297 VM_EXITCODE_SMCCC,
298 VM_EXITCODE_DEBUG,
299 VM_EXITCODE_BRK,
300 VM_EXITCODE_SS,
301 VM_EXITCODE_MAX
302 };
303
304 struct vm_exit {
305 enum vm_exitcode exitcode;
306 int inst_length;
307 uint64_t pc;
308 union {
309 /*
310 * ARM specific payload.
311 */
312 struct {
313 uint32_t exception_nr;
314 uint32_t pad;
315 uint64_t esr_el2; /* Exception Syndrome Register */
316 uint64_t far_el2; /* Fault Address Register */
317 uint64_t hpfar_el2; /* Hypervisor IPA Fault Address Register */
318 } hyp;
319 struct {
320 struct vre vre;
321 } reg_emul;
322 struct {
323 uint64_t gpa;
324 uint64_t esr;
325 } paging;
326 struct {
327 uint64_t gpa;
328 struct vm_guest_paging paging;
329 struct vie vie;
330 } inst_emul;
331
332 /*
333 * A SMCCC call, e.g. starting a core via PSCI.
334 * Further arguments can be read by asking the kernel for
335 * all register values.
336 */
337 struct {
338 uint64_t func_id;
339 uint64_t args[7];
340 } smccc_call;
341
342 struct {
343 enum vm_suspend_how how;
344 } suspended;
345 } u;
346 };
347
348 #endif /* _VMM_H_ */
349