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 #include "vmm_fence.h"
62
63 static int
vmm_sbi_handle_rfnc(struct vcpu * vcpu,struct hypctx * hypctx)64 vmm_sbi_handle_rfnc(struct vcpu *vcpu, struct hypctx *hypctx)
65 {
66 struct vmm_fence fence;
67 uint64_t hart_mask;
68 uint64_t hart_mask_base;
69 uint64_t func_id;
70 struct hyp *hyp;
71 uint16_t maxcpus;
72 cpuset_t cpus;
73 int vcpu_id;
74 int i;
75
76 func_id = hypctx->guest_regs.hyp_a[6];
77 hart_mask = hypctx->guest_regs.hyp_a[0];
78 hart_mask_base = hypctx->guest_regs.hyp_a[1];
79
80 /* Construct vma_fence. */
81
82 fence.start = hypctx->guest_regs.hyp_a[2];
83 fence.size = hypctx->guest_regs.hyp_a[3];
84 fence.asid = hypctx->guest_regs.hyp_a[4];
85
86 switch (func_id) {
87 case SBI_RFNC_REMOTE_FENCE_I:
88 fence.type = VMM_RISCV_FENCE_I;
89 break;
90 case SBI_RFNC_REMOTE_SFENCE_VMA:
91 fence.type = VMM_RISCV_FENCE_VMA;
92 break;
93 case SBI_RFNC_REMOTE_SFENCE_VMA_ASID:
94 fence.type = VMM_RISCV_FENCE_VMA_ASID;
95 break;
96 default:
97 return (-1);
98 }
99
100 /* Construct cpuset_t from the mask supplied. */
101
102 CPU_ZERO(&cpus);
103 hyp = hypctx->hyp;
104 maxcpus = vm_get_maxcpus(hyp->vm);
105 for (i = 0; i < maxcpus; i++) {
106 vcpu = vm_vcpu(hyp->vm, i);
107 if (vcpu == NULL)
108 continue;
109 vcpu_id = vcpu_vcpuid(vcpu);
110 if (hart_mask_base != -1UL) {
111 if (vcpu_id < hart_mask_base)
112 continue;
113 if (!(hart_mask & (1UL << (vcpu_id - hart_mask_base))))
114 continue;
115 }
116 CPU_SET(i, &cpus);
117 }
118
119 vmm_fence_add(hyp->vm, &cpus, &fence);
120
121 return (0);
122 }
123
124 static int
vmm_sbi_handle_time(struct vcpu * vcpu,struct hypctx * hypctx)125 vmm_sbi_handle_time(struct vcpu *vcpu, struct hypctx *hypctx)
126 {
127 uint64_t func_id;
128 uint64_t next_val;
129 int ret;
130
131 func_id = hypctx->guest_regs.hyp_a[6];
132 next_val = hypctx->guest_regs.hyp_a[0];
133
134 switch (func_id) {
135 case SBI_TIME_SET_TIMER:
136 vtimer_set_timer(hypctx, next_val);
137 ret = 0;
138 break;
139 default:
140 ret = -1;
141 break;
142 }
143
144 hypctx->guest_regs.hyp_a[0] = ret;
145
146 return (0);
147 }
148
149 static int
vmm_sbi_handle_ipi(struct vcpu * vcpu,struct hypctx * hypctx)150 vmm_sbi_handle_ipi(struct vcpu *vcpu, struct hypctx *hypctx)
151 {
152 struct hypctx *target_hypctx;
153 struct vcpu *target_vcpu __unused;
154 cpuset_t active_cpus;
155 struct hyp *hyp;
156 uint64_t hart_mask;
157 uint64_t func_id;
158 int hart_id;
159 int bit;
160 int ret;
161
162 func_id = hypctx->guest_regs.hyp_a[6];
163 hart_mask = hypctx->guest_regs.hyp_a[0];
164
165 dprintf("%s: hart_mask %lx\n", __func__, hart_mask);
166
167 hyp = hypctx->hyp;
168
169 active_cpus = vm_active_cpus(hyp->vm);
170
171 switch (func_id) {
172 case SBI_IPI_SEND_IPI:
173 while ((bit = ffs(hart_mask))) {
174 hart_id = (bit - 1);
175 hart_mask &= ~(1u << hart_id);
176 if (CPU_ISSET(hart_id, &active_cpus)) {
177 /* TODO. */
178 target_vcpu = vm_vcpu(hyp->vm, hart_id);
179 target_hypctx = hypctx->hyp->ctx[hart_id];
180 riscv_send_ipi(target_hypctx, hart_id);
181 }
182 }
183 ret = 0;
184 break;
185 default:
186 printf("%s: unknown func %ld\n", __func__, func_id);
187 ret = -1;
188 break;
189 }
190
191 hypctx->guest_regs.hyp_a[0] = ret;
192
193 return (0);
194 }
195
196 int
vmm_sbi_ecall(struct vcpu * vcpu,bool * retu)197 vmm_sbi_ecall(struct vcpu *vcpu, bool *retu)
198 {
199 int sbi_extension_id __unused;
200 struct hypctx *hypctx;
201 int error;
202
203 hypctx = riscv_get_active_vcpu();
204 sbi_extension_id = hypctx->guest_regs.hyp_a[7];
205
206 dprintf("%s: args %lx %lx %lx %lx %lx %lx %lx %lx\n", __func__,
207 hypctx->guest_regs.hyp_a[0],
208 hypctx->guest_regs.hyp_a[1],
209 hypctx->guest_regs.hyp_a[2],
210 hypctx->guest_regs.hyp_a[3],
211 hypctx->guest_regs.hyp_a[4],
212 hypctx->guest_regs.hyp_a[5],
213 hypctx->guest_regs.hyp_a[6],
214 hypctx->guest_regs.hyp_a[7]);
215
216 switch (sbi_extension_id) {
217 case SBI_EXT_ID_RFNC:
218 error = vmm_sbi_handle_rfnc(vcpu, hypctx);
219 hypctx->guest_regs.hyp_a[0] = error;
220 break;
221 case SBI_EXT_ID_TIME:
222 vmm_sbi_handle_time(vcpu, hypctx);
223 break;
224 case SBI_EXT_ID_IPI:
225 vmm_sbi_handle_ipi(vcpu, hypctx);
226 break;
227 default:
228 *retu = true;
229 break;
230 }
231
232 return (0);
233 }
234