1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2024 Ruslan Bukin <br@bsdpad.com>
5 *
6 * This software was developed by the University of Cambridge Computer
7 * Laboratory (Department of Computer Science and Technology) under Innovate
8 * UK project 105694, "Digital Security by Design (DSbD) Technology Platform
9 * Prototype".
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/jail.h>
36 #include <sys/queue.h>
37 #include <sys/lock.h>
38 #include <sys/mutex.h>
39 #include <sys/malloc.h>
40 #include <sys/conf.h>
41 #include <sys/sysctl.h>
42 #include <sys/libkern.h>
43 #include <sys/ioccom.h>
44 #include <sys/mman.h>
45 #include <sys/uio.h>
46 #include <sys/proc.h>
47
48 #include <vm/vm.h>
49 #include <vm/pmap.h>
50 #include <vm/vm_map.h>
51 #include <vm/vm_object.h>
52
53 #include <machine/machdep.h>
54 #include <machine/vmparam.h>
55 #include <machine/vmm.h>
56 #include <machine/vmm_dev.h>
57 #include <machine/md_var.h>
58 #include <machine/sbi.h>
59
60 #include "riscv.h"
61
62 static int
vmm_sbi_handle_rfnc(struct vcpu * vcpu,struct hypctx * hypctx)63 vmm_sbi_handle_rfnc(struct vcpu *vcpu, struct hypctx *hypctx)
64 {
65 uint64_t hart_mask __unused;
66 uint64_t start __unused;
67 uint64_t size __unused;
68 uint64_t asid __unused;
69 uint64_t func_id;
70
71 func_id = hypctx->guest_regs.hyp_a[6];
72 hart_mask = hypctx->guest_regs.hyp_a[0];
73 start = hypctx->guest_regs.hyp_a[2];
74 size = hypctx->guest_regs.hyp_a[3];
75 asid = hypctx->guest_regs.hyp_a[4];
76
77 dprintf("%s: %ld hart_mask %lx start %lx size %lx\n", __func__,
78 func_id, hart_mask, start, size);
79
80 /* TODO: implement remote sfence. */
81
82 switch (func_id) {
83 case SBI_RFNC_REMOTE_FENCE_I:
84 break;
85 case SBI_RFNC_REMOTE_SFENCE_VMA:
86 break;
87 case SBI_RFNC_REMOTE_SFENCE_VMA_ASID:
88 break;
89 default:
90 break;
91 }
92
93 hypctx->guest_regs.hyp_a[0] = 0;
94
95 return (0);
96 }
97
98 static int
vmm_sbi_handle_time(struct vcpu * vcpu,struct hypctx * hypctx)99 vmm_sbi_handle_time(struct vcpu *vcpu, struct hypctx *hypctx)
100 {
101 uint64_t func_id;
102 uint64_t next_val;
103 int ret;
104
105 func_id = hypctx->guest_regs.hyp_a[6];
106 next_val = hypctx->guest_regs.hyp_a[0];
107
108 switch (func_id) {
109 case SBI_TIME_SET_TIMER:
110 vtimer_set_timer(hypctx, next_val);
111 ret = 0;
112 break;
113 default:
114 ret = -1;
115 break;
116 }
117
118 hypctx->guest_regs.hyp_a[0] = ret;
119
120 return (0);
121 }
122
123 static int
vmm_sbi_handle_ipi(struct vcpu * vcpu,struct hypctx * hypctx)124 vmm_sbi_handle_ipi(struct vcpu *vcpu, struct hypctx *hypctx)
125 {
126 struct hypctx *target_hypctx;
127 struct vcpu *target_vcpu __unused;
128 cpuset_t active_cpus;
129 struct hyp *hyp;
130 uint64_t hart_mask;
131 uint64_t func_id;
132 int hart_id;
133 int bit;
134 int ret;
135
136 func_id = hypctx->guest_regs.hyp_a[6];
137 hart_mask = hypctx->guest_regs.hyp_a[0];
138
139 dprintf("%s: hart_mask %lx\n", __func__, hart_mask);
140
141 hyp = hypctx->hyp;
142
143 active_cpus = vm_active_cpus(hyp->vm);
144
145 switch (func_id) {
146 case SBI_IPI_SEND_IPI:
147 while ((bit = ffs(hart_mask))) {
148 hart_id = (bit - 1);
149 hart_mask &= ~(1u << hart_id);
150 if (CPU_ISSET(hart_id, &active_cpus)) {
151 /* TODO. */
152 target_vcpu = vm_vcpu(hyp->vm, hart_id);
153 target_hypctx = hypctx->hyp->ctx[hart_id];
154 riscv_send_ipi(target_hypctx, hart_id);
155 }
156 }
157 ret = 0;
158 break;
159 default:
160 printf("%s: unknown func %ld\n", __func__, func_id);
161 ret = -1;
162 break;
163 }
164
165 hypctx->guest_regs.hyp_a[0] = ret;
166
167 return (0);
168 }
169
170 int
vmm_sbi_ecall(struct vcpu * vcpu,bool * retu)171 vmm_sbi_ecall(struct vcpu *vcpu, bool *retu)
172 {
173 int sbi_extension_id __unused;
174 struct hypctx *hypctx;
175
176 hypctx = riscv_get_active_vcpu();
177 sbi_extension_id = hypctx->guest_regs.hyp_a[7];
178
179 dprintf("%s: args %lx %lx %lx %lx %lx %lx %lx %lx\n", __func__,
180 hypctx->guest_regs.hyp_a[0],
181 hypctx->guest_regs.hyp_a[1],
182 hypctx->guest_regs.hyp_a[2],
183 hypctx->guest_regs.hyp_a[3],
184 hypctx->guest_regs.hyp_a[4],
185 hypctx->guest_regs.hyp_a[5],
186 hypctx->guest_regs.hyp_a[6],
187 hypctx->guest_regs.hyp_a[7]);
188
189 switch (sbi_extension_id) {
190 case SBI_EXT_ID_RFNC:
191 vmm_sbi_handle_rfnc(vcpu, hypctx);
192 break;
193 case SBI_EXT_ID_TIME:
194 vmm_sbi_handle_time(vcpu, hypctx);
195 break;
196 case SBI_EXT_ID_IPI:
197 vmm_sbi_handle_ipi(vcpu, hypctx);
198 break;
199 default:
200 *retu = true;
201 break;
202 }
203
204 return (0);
205 }
206