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1 | 967f97fa | aliguori | /*
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2 | 967f97fa | aliguori | * Virtio Support
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3 | 967f97fa | aliguori | *
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4 | 967f97fa | aliguori | * Copyright IBM, Corp. 2007
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5 | 967f97fa | aliguori | *
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6 | 967f97fa | aliguori | * Authors:
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7 | 967f97fa | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | 967f97fa | aliguori | *
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9 | 967f97fa | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 967f97fa | aliguori | * the COPYING file in the top-level directory.
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11 | 967f97fa | aliguori | *
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12 | 967f97fa | aliguori | */
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13 | 967f97fa | aliguori | |
14 | 967f97fa | aliguori | #include <inttypes.h> |
15 | 967f97fa | aliguori | |
16 | 64979a4d | Stefan Hajnoczi | #include "trace.h" |
17 | ce67ed65 | Stefan Hajnoczi | #include "qemu-error.h" |
18 | 967f97fa | aliguori | #include "virtio.h" |
19 | 967f97fa | aliguori | #include "sysemu.h" |
20 | 967f97fa | aliguori | |
21 | f46f15bc | aliguori | /* The alignment to use between consumer and producer parts of vring.
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22 | f46f15bc | aliguori | * x86 pagesize again. */
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23 | f46f15bc | aliguori | #define VIRTIO_PCI_VRING_ALIGN 4096 |
24 | f46f15bc | aliguori | |
25 | 967f97fa | aliguori | /* QEMU doesn't strictly need write barriers since everything runs in
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26 | 967f97fa | aliguori | * lock-step. We'll leave the calls to wmb() in though to make it obvious for
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27 | 967f97fa | aliguori | * KVM or if kqemu gets SMP support.
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28 | 79758e95 | Michael S. Tsirkin | * In any case, we must prevent the compiler from reordering the code.
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29 | 79758e95 | Michael S. Tsirkin | * TODO: we likely need some rmb()/mb() as well.
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30 | 967f97fa | aliguori | */
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31 | 79758e95 | Michael S. Tsirkin | |
32 | 79758e95 | Michael S. Tsirkin | #define wmb() __asm__ __volatile__("": : :"memory") |
33 | 967f97fa | aliguori | |
34 | 967f97fa | aliguori | typedef struct VRingDesc |
35 | 967f97fa | aliguori | { |
36 | 967f97fa | aliguori | uint64_t addr; |
37 | 967f97fa | aliguori | uint32_t len; |
38 | 967f97fa | aliguori | uint16_t flags; |
39 | 967f97fa | aliguori | uint16_t next; |
40 | 967f97fa | aliguori | } VRingDesc; |
41 | 967f97fa | aliguori | |
42 | 967f97fa | aliguori | typedef struct VRingAvail |
43 | 967f97fa | aliguori | { |
44 | 967f97fa | aliguori | uint16_t flags; |
45 | 967f97fa | aliguori | uint16_t idx; |
46 | 967f97fa | aliguori | uint16_t ring[0];
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47 | 967f97fa | aliguori | } VRingAvail; |
48 | 967f97fa | aliguori | |
49 | 967f97fa | aliguori | typedef struct VRingUsedElem |
50 | 967f97fa | aliguori | { |
51 | 967f97fa | aliguori | uint32_t id; |
52 | 967f97fa | aliguori | uint32_t len; |
53 | 967f97fa | aliguori | } VRingUsedElem; |
54 | 967f97fa | aliguori | |
55 | 967f97fa | aliguori | typedef struct VRingUsed |
56 | 967f97fa | aliguori | { |
57 | 967f97fa | aliguori | uint16_t flags; |
58 | 967f97fa | aliguori | uint16_t idx; |
59 | 967f97fa | aliguori | VRingUsedElem ring[0];
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60 | 967f97fa | aliguori | } VRingUsed; |
61 | 967f97fa | aliguori | |
62 | 967f97fa | aliguori | typedef struct VRing |
63 | 967f97fa | aliguori | { |
64 | 967f97fa | aliguori | unsigned int num; |
65 | c227f099 | Anthony Liguori | target_phys_addr_t desc; |
66 | c227f099 | Anthony Liguori | target_phys_addr_t avail; |
67 | c227f099 | Anthony Liguori | target_phys_addr_t used; |
68 | 967f97fa | aliguori | } VRing; |
69 | 967f97fa | aliguori | |
70 | 967f97fa | aliguori | struct VirtQueue
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71 | 967f97fa | aliguori | { |
72 | 967f97fa | aliguori | VRing vring; |
73 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
74 | 967f97fa | aliguori | uint16_t last_avail_idx; |
75 | 967f97fa | aliguori | int inuse;
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76 | 7055e687 | Michael S. Tsirkin | uint16_t vector; |
77 | 967f97fa | aliguori | void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
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78 | 1cbdabe2 | Michael S. Tsirkin | VirtIODevice *vdev; |
79 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier guest_notifier; |
80 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier host_notifier; |
81 | 967f97fa | aliguori | }; |
82 | 967f97fa | aliguori | |
83 | 967f97fa | aliguori | /* virt queue functions */
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84 | 53c25cea | Paul Brook | static void virtqueue_init(VirtQueue *vq) |
85 | 967f97fa | aliguori | { |
86 | c227f099 | Anthony Liguori | target_phys_addr_t pa = vq->pa; |
87 | 53c25cea | Paul Brook | |
88 | 967f97fa | aliguori | vq->vring.desc = pa; |
89 | 967f97fa | aliguori | vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
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90 | f46f15bc | aliguori | vq->vring.used = vring_align(vq->vring.avail + |
91 | f46f15bc | aliguori | offsetof(VRingAvail, ring[vq->vring.num]), |
92 | f46f15bc | aliguori | VIRTIO_PCI_VRING_ALIGN); |
93 | 967f97fa | aliguori | } |
94 | 967f97fa | aliguori | |
95 | c227f099 | Anthony Liguori | static inline uint64_t vring_desc_addr(target_phys_addr_t desc_pa, int i) |
96 | 967f97fa | aliguori | { |
97 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
98 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
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99 | 967f97fa | aliguori | return ldq_phys(pa);
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100 | 967f97fa | aliguori | } |
101 | 967f97fa | aliguori | |
102 | c227f099 | Anthony Liguori | static inline uint32_t vring_desc_len(target_phys_addr_t desc_pa, int i) |
103 | 967f97fa | aliguori | { |
104 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
105 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
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106 | 967f97fa | aliguori | return ldl_phys(pa);
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107 | 967f97fa | aliguori | } |
108 | 967f97fa | aliguori | |
109 | c227f099 | Anthony Liguori | static inline uint16_t vring_desc_flags(target_phys_addr_t desc_pa, int i) |
110 | 967f97fa | aliguori | { |
111 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
112 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
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113 | 967f97fa | aliguori | return lduw_phys(pa);
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114 | 967f97fa | aliguori | } |
115 | 967f97fa | aliguori | |
116 | c227f099 | Anthony Liguori | static inline uint16_t vring_desc_next(target_phys_addr_t desc_pa, int i) |
117 | 967f97fa | aliguori | { |
118 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
119 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
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120 | 967f97fa | aliguori | return lduw_phys(pa);
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121 | 967f97fa | aliguori | } |
122 | 967f97fa | aliguori | |
123 | 967f97fa | aliguori | static inline uint16_t vring_avail_flags(VirtQueue *vq) |
124 | 967f97fa | aliguori | { |
125 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
126 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, flags); |
127 | 967f97fa | aliguori | return lduw_phys(pa);
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128 | 967f97fa | aliguori | } |
129 | 967f97fa | aliguori | |
130 | 967f97fa | aliguori | static inline uint16_t vring_avail_idx(VirtQueue *vq) |
131 | 967f97fa | aliguori | { |
132 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
133 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, idx); |
134 | 967f97fa | aliguori | return lduw_phys(pa);
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135 | 967f97fa | aliguori | } |
136 | 967f97fa | aliguori | |
137 | 967f97fa | aliguori | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
138 | 967f97fa | aliguori | { |
139 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
140 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
141 | 967f97fa | aliguori | return lduw_phys(pa);
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142 | 967f97fa | aliguori | } |
143 | 967f97fa | aliguori | |
144 | 967f97fa | aliguori | static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
145 | 967f97fa | aliguori | { |
146 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
147 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
148 | 967f97fa | aliguori | stl_phys(pa, val); |
149 | 967f97fa | aliguori | } |
150 | 967f97fa | aliguori | |
151 | 967f97fa | aliguori | static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) |
152 | 967f97fa | aliguori | { |
153 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
154 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); |
155 | 967f97fa | aliguori | stl_phys(pa, val); |
156 | 967f97fa | aliguori | } |
157 | 967f97fa | aliguori | |
158 | 967f97fa | aliguori | static uint16_t vring_used_idx(VirtQueue *vq)
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159 | 967f97fa | aliguori | { |
160 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
161 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, idx); |
162 | 967f97fa | aliguori | return lduw_phys(pa);
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163 | 967f97fa | aliguori | } |
164 | 967f97fa | aliguori | |
165 | 967f97fa | aliguori | static inline void vring_used_idx_increment(VirtQueue *vq, uint16_t val) |
166 | 967f97fa | aliguori | { |
167 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
168 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, idx); |
169 | 967f97fa | aliguori | stw_phys(pa, vring_used_idx(vq) + val); |
170 | 967f97fa | aliguori | } |
171 | 967f97fa | aliguori | |
172 | 967f97fa | aliguori | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
173 | 967f97fa | aliguori | { |
174 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
175 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, flags); |
176 | 967f97fa | aliguori | stw_phys(pa, lduw_phys(pa) | mask); |
177 | 967f97fa | aliguori | } |
178 | 967f97fa | aliguori | |
179 | 967f97fa | aliguori | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
180 | 967f97fa | aliguori | { |
181 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
182 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, flags); |
183 | 967f97fa | aliguori | stw_phys(pa, lduw_phys(pa) & ~mask); |
184 | 967f97fa | aliguori | } |
185 | 967f97fa | aliguori | |
186 | 967f97fa | aliguori | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
187 | 967f97fa | aliguori | { |
188 | 967f97fa | aliguori | if (enable)
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189 | 967f97fa | aliguori | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
190 | 967f97fa | aliguori | else
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191 | 967f97fa | aliguori | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
192 | 967f97fa | aliguori | } |
193 | 967f97fa | aliguori | |
194 | 967f97fa | aliguori | int virtio_queue_ready(VirtQueue *vq)
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195 | 967f97fa | aliguori | { |
196 | 967f97fa | aliguori | return vq->vring.avail != 0; |
197 | 967f97fa | aliguori | } |
198 | 967f97fa | aliguori | |
199 | 967f97fa | aliguori | int virtio_queue_empty(VirtQueue *vq)
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200 | 967f97fa | aliguori | { |
201 | 967f97fa | aliguori | return vring_avail_idx(vq) == vq->last_avail_idx;
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202 | 967f97fa | aliguori | } |
203 | 967f97fa | aliguori | |
204 | 967f97fa | aliguori | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
205 | 967f97fa | aliguori | unsigned int len, unsigned int idx) |
206 | 967f97fa | aliguori | { |
207 | 967f97fa | aliguori | unsigned int offset; |
208 | 967f97fa | aliguori | int i;
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209 | 967f97fa | aliguori | |
210 | 64979a4d | Stefan Hajnoczi | trace_virtqueue_fill(vq, elem, len, idx); |
211 | 64979a4d | Stefan Hajnoczi | |
212 | 967f97fa | aliguori | offset = 0;
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213 | 967f97fa | aliguori | for (i = 0; i < elem->in_num; i++) { |
214 | 967f97fa | aliguori | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); |
215 | 967f97fa | aliguori | |
216 | 26b258e1 | aliguori | cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
217 | 26b258e1 | aliguori | elem->in_sg[i].iov_len, |
218 | 26b258e1 | aliguori | 1, size);
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219 | 967f97fa | aliguori | |
220 | 26b258e1 | aliguori | offset += elem->in_sg[i].iov_len; |
221 | 967f97fa | aliguori | } |
222 | 967f97fa | aliguori | |
223 | 26b258e1 | aliguori | for (i = 0; i < elem->out_num; i++) |
224 | 26b258e1 | aliguori | cpu_physical_memory_unmap(elem->out_sg[i].iov_base, |
225 | 26b258e1 | aliguori | elem->out_sg[i].iov_len, |
226 | 26b258e1 | aliguori | 0, elem->out_sg[i].iov_len);
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227 | 26b258e1 | aliguori | |
228 | 967f97fa | aliguori | idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
229 | 967f97fa | aliguori | |
230 | 967f97fa | aliguori | /* Get a pointer to the next entry in the used ring. */
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231 | 967f97fa | aliguori | vring_used_ring_id(vq, idx, elem->index); |
232 | 967f97fa | aliguori | vring_used_ring_len(vq, idx, len); |
233 | 967f97fa | aliguori | } |
234 | 967f97fa | aliguori | |
235 | 967f97fa | aliguori | void virtqueue_flush(VirtQueue *vq, unsigned int count) |
236 | 967f97fa | aliguori | { |
237 | 967f97fa | aliguori | /* Make sure buffer is written before we update index. */
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238 | 967f97fa | aliguori | wmb(); |
239 | 64979a4d | Stefan Hajnoczi | trace_virtqueue_flush(vq, count); |
240 | 967f97fa | aliguori | vring_used_idx_increment(vq, count); |
241 | 967f97fa | aliguori | vq->inuse -= count; |
242 | 967f97fa | aliguori | } |
243 | 967f97fa | aliguori | |
244 | 967f97fa | aliguori | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
245 | 967f97fa | aliguori | unsigned int len) |
246 | 967f97fa | aliguori | { |
247 | 967f97fa | aliguori | virtqueue_fill(vq, elem, len, 0);
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248 | 967f97fa | aliguori | virtqueue_flush(vq, 1);
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249 | 967f97fa | aliguori | } |
250 | 967f97fa | aliguori | |
251 | 967f97fa | aliguori | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
252 | 967f97fa | aliguori | { |
253 | 967f97fa | aliguori | uint16_t num_heads = vring_avail_idx(vq) - idx; |
254 | 967f97fa | aliguori | |
255 | 967f97fa | aliguori | /* Check it isn't doing very strange things with descriptor numbers. */
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256 | bb6834cf | aliguori | if (num_heads > vq->vring.num) {
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257 | ce67ed65 | Stefan Hajnoczi | error_report("Guest moved used index from %u to %u",
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258 | ce67ed65 | Stefan Hajnoczi | idx, vring_avail_idx(vq)); |
259 | bb6834cf | aliguori | exit(1);
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260 | bb6834cf | aliguori | } |
261 | 967f97fa | aliguori | |
262 | 967f97fa | aliguori | return num_heads;
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263 | 967f97fa | aliguori | } |
264 | 967f97fa | aliguori | |
265 | 967f97fa | aliguori | static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) |
266 | 967f97fa | aliguori | { |
267 | 967f97fa | aliguori | unsigned int head; |
268 | 967f97fa | aliguori | |
269 | 967f97fa | aliguori | /* Grab the next descriptor number they're advertising, and increment
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270 | 967f97fa | aliguori | * the index we've seen. */
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271 | 967f97fa | aliguori | head = vring_avail_ring(vq, idx % vq->vring.num); |
272 | 967f97fa | aliguori | |
273 | 967f97fa | aliguori | /* If their number is silly, that's a fatal mistake. */
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274 | bb6834cf | aliguori | if (head >= vq->vring.num) {
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275 | ce67ed65 | Stefan Hajnoczi | error_report("Guest says index %u is available", head);
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276 | bb6834cf | aliguori | exit(1);
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277 | bb6834cf | aliguori | } |
278 | 967f97fa | aliguori | |
279 | 967f97fa | aliguori | return head;
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280 | 967f97fa | aliguori | } |
281 | 967f97fa | aliguori | |
282 | c227f099 | Anthony Liguori | static unsigned virtqueue_next_desc(target_phys_addr_t desc_pa, |
283 | 5774cf98 | Mark McLoughlin | unsigned int i, unsigned int max) |
284 | 967f97fa | aliguori | { |
285 | 967f97fa | aliguori | unsigned int next; |
286 | 967f97fa | aliguori | |
287 | 967f97fa | aliguori | /* If this descriptor says it doesn't chain, we're done. */
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288 | 5774cf98 | Mark McLoughlin | if (!(vring_desc_flags(desc_pa, i) & VRING_DESC_F_NEXT))
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289 | 5774cf98 | Mark McLoughlin | return max;
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290 | 967f97fa | aliguori | |
291 | 967f97fa | aliguori | /* Check they're not leading us off end of descriptors. */
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292 | 5774cf98 | Mark McLoughlin | next = vring_desc_next(desc_pa, i); |
293 | 967f97fa | aliguori | /* Make sure compiler knows to grab that: we don't want it changing! */
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294 | 967f97fa | aliguori | wmb(); |
295 | 967f97fa | aliguori | |
296 | 5774cf98 | Mark McLoughlin | if (next >= max) {
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297 | ce67ed65 | Stefan Hajnoczi | error_report("Desc next is %u", next);
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298 | bb6834cf | aliguori | exit(1);
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299 | bb6834cf | aliguori | } |
300 | 967f97fa | aliguori | |
301 | 967f97fa | aliguori | return next;
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302 | 967f97fa | aliguori | } |
303 | 967f97fa | aliguori | |
304 | 967f97fa | aliguori | int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes) |
305 | 967f97fa | aliguori | { |
306 | efeea6d0 | Mark McLoughlin | unsigned int idx; |
307 | efeea6d0 | Mark McLoughlin | int total_bufs, in_total, out_total;
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308 | 967f97fa | aliguori | |
309 | 967f97fa | aliguori | idx = vq->last_avail_idx; |
310 | 967f97fa | aliguori | |
311 | efeea6d0 | Mark McLoughlin | total_bufs = in_total = out_total = 0;
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312 | 967f97fa | aliguori | while (virtqueue_num_heads(vq, idx)) {
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313 | efeea6d0 | Mark McLoughlin | unsigned int max, num_bufs, indirect = 0; |
314 | c227f099 | Anthony Liguori | target_phys_addr_t desc_pa; |
315 | 967f97fa | aliguori | int i;
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316 | 967f97fa | aliguori | |
317 | efeea6d0 | Mark McLoughlin | max = vq->vring.num; |
318 | efeea6d0 | Mark McLoughlin | num_bufs = total_bufs; |
319 | 967f97fa | aliguori | i = virtqueue_get_head(vq, idx++); |
320 | efeea6d0 | Mark McLoughlin | desc_pa = vq->vring.desc; |
321 | efeea6d0 | Mark McLoughlin | |
322 | efeea6d0 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
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323 | efeea6d0 | Mark McLoughlin | if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
324 | ce67ed65 | Stefan Hajnoczi | error_report("Invalid size for indirect buffer table");
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325 | efeea6d0 | Mark McLoughlin | exit(1);
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326 | efeea6d0 | Mark McLoughlin | } |
327 | efeea6d0 | Mark McLoughlin | |
328 | efeea6d0 | Mark McLoughlin | /* If we've got too many, that implies a descriptor loop. */
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329 | efeea6d0 | Mark McLoughlin | if (num_bufs >= max) {
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330 | ce67ed65 | Stefan Hajnoczi | error_report("Looped descriptor");
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331 | efeea6d0 | Mark McLoughlin | exit(1);
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332 | efeea6d0 | Mark McLoughlin | } |
333 | efeea6d0 | Mark McLoughlin | |
334 | efeea6d0 | Mark McLoughlin | /* loop over the indirect descriptor table */
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335 | efeea6d0 | Mark McLoughlin | indirect = 1;
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336 | efeea6d0 | Mark McLoughlin | max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
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337 | efeea6d0 | Mark McLoughlin | num_bufs = i = 0;
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338 | efeea6d0 | Mark McLoughlin | desc_pa = vring_desc_addr(desc_pa, i); |
339 | efeea6d0 | Mark McLoughlin | } |
340 | efeea6d0 | Mark McLoughlin | |
341 | 967f97fa | aliguori | do {
|
342 | 967f97fa | aliguori | /* If we've got too many, that implies a descriptor loop. */
|
343 | 5774cf98 | Mark McLoughlin | if (++num_bufs > max) {
|
344 | ce67ed65 | Stefan Hajnoczi | error_report("Looped descriptor");
|
345 | bb6834cf | aliguori | exit(1);
|
346 | bb6834cf | aliguori | } |
347 | 967f97fa | aliguori | |
348 | 5774cf98 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
|
349 | 967f97fa | aliguori | if (in_bytes > 0 && |
350 | 5774cf98 | Mark McLoughlin | (in_total += vring_desc_len(desc_pa, i)) >= in_bytes) |
351 | 967f97fa | aliguori | return 1; |
352 | 967f97fa | aliguori | } else {
|
353 | 967f97fa | aliguori | if (out_bytes > 0 && |
354 | 5774cf98 | Mark McLoughlin | (out_total += vring_desc_len(desc_pa, i)) >= out_bytes) |
355 | 967f97fa | aliguori | return 1; |
356 | 967f97fa | aliguori | } |
357 | 5774cf98 | Mark McLoughlin | } while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
|
358 | efeea6d0 | Mark McLoughlin | |
359 | efeea6d0 | Mark McLoughlin | if (!indirect)
|
360 | efeea6d0 | Mark McLoughlin | total_bufs = num_bufs; |
361 | efeea6d0 | Mark McLoughlin | else
|
362 | efeea6d0 | Mark McLoughlin | total_bufs++; |
363 | 967f97fa | aliguori | } |
364 | 967f97fa | aliguori | |
365 | 967f97fa | aliguori | return 0; |
366 | 967f97fa | aliguori | } |
367 | 967f97fa | aliguori | |
368 | 42fb2e07 | Kevin Wolf | void virtqueue_map_sg(struct iovec *sg, target_phys_addr_t *addr, |
369 | 42fb2e07 | Kevin Wolf | size_t num_sg, int is_write)
|
370 | 42fb2e07 | Kevin Wolf | { |
371 | 42fb2e07 | Kevin Wolf | unsigned int i; |
372 | 42fb2e07 | Kevin Wolf | target_phys_addr_t len; |
373 | 42fb2e07 | Kevin Wolf | |
374 | 42fb2e07 | Kevin Wolf | for (i = 0; i < num_sg; i++) { |
375 | 42fb2e07 | Kevin Wolf | len = sg[i].iov_len; |
376 | 42fb2e07 | Kevin Wolf | sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); |
377 | 42fb2e07 | Kevin Wolf | if (sg[i].iov_base == NULL || len != sg[i].iov_len) { |
378 | ce67ed65 | Stefan Hajnoczi | error_report("virtio: trying to map MMIO memory");
|
379 | 42fb2e07 | Kevin Wolf | exit(1);
|
380 | 42fb2e07 | Kevin Wolf | } |
381 | 42fb2e07 | Kevin Wolf | } |
382 | 42fb2e07 | Kevin Wolf | } |
383 | 42fb2e07 | Kevin Wolf | |
384 | 967f97fa | aliguori | int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
|
385 | 967f97fa | aliguori | { |
386 | 5774cf98 | Mark McLoughlin | unsigned int i, head, max; |
387 | c227f099 | Anthony Liguori | target_phys_addr_t desc_pa = vq->vring.desc; |
388 | 967f97fa | aliguori | |
389 | 967f97fa | aliguori | if (!virtqueue_num_heads(vq, vq->last_avail_idx))
|
390 | 967f97fa | aliguori | return 0; |
391 | 967f97fa | aliguori | |
392 | 967f97fa | aliguori | /* When we start there are none of either input nor output. */
|
393 | 967f97fa | aliguori | elem->out_num = elem->in_num = 0;
|
394 | 967f97fa | aliguori | |
395 | 5774cf98 | Mark McLoughlin | max = vq->vring.num; |
396 | 5774cf98 | Mark McLoughlin | |
397 | 967f97fa | aliguori | i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
398 | efeea6d0 | Mark McLoughlin | |
399 | efeea6d0 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
400 | efeea6d0 | Mark McLoughlin | if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
401 | ce67ed65 | Stefan Hajnoczi | error_report("Invalid size for indirect buffer table");
|
402 | efeea6d0 | Mark McLoughlin | exit(1);
|
403 | efeea6d0 | Mark McLoughlin | } |
404 | efeea6d0 | Mark McLoughlin | |
405 | efeea6d0 | Mark McLoughlin | /* loop over the indirect descriptor table */
|
406 | efeea6d0 | Mark McLoughlin | max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
|
407 | efeea6d0 | Mark McLoughlin | desc_pa = vring_desc_addr(desc_pa, i); |
408 | efeea6d0 | Mark McLoughlin | i = 0;
|
409 | efeea6d0 | Mark McLoughlin | } |
410 | efeea6d0 | Mark McLoughlin | |
411 | 42fb2e07 | Kevin Wolf | /* Collect all the descriptors */
|
412 | 967f97fa | aliguori | do {
|
413 | 967f97fa | aliguori | struct iovec *sg;
|
414 | 967f97fa | aliguori | |
415 | 5774cf98 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
|
416 | 5774cf98 | Mark McLoughlin | elem->in_addr[elem->in_num] = vring_desc_addr(desc_pa, i); |
417 | 967f97fa | aliguori | sg = &elem->in_sg[elem->in_num++]; |
418 | 42fb2e07 | Kevin Wolf | } else {
|
419 | 42fb2e07 | Kevin Wolf | elem->out_addr[elem->out_num] = vring_desc_addr(desc_pa, i); |
420 | 967f97fa | aliguori | sg = &elem->out_sg[elem->out_num++]; |
421 | 42fb2e07 | Kevin Wolf | } |
422 | 967f97fa | aliguori | |
423 | 5774cf98 | Mark McLoughlin | sg->iov_len = vring_desc_len(desc_pa, i); |
424 | 967f97fa | aliguori | |
425 | 967f97fa | aliguori | /* If we've got too many, that implies a descriptor loop. */
|
426 | 5774cf98 | Mark McLoughlin | if ((elem->in_num + elem->out_num) > max) {
|
427 | ce67ed65 | Stefan Hajnoczi | error_report("Looped descriptor");
|
428 | bb6834cf | aliguori | exit(1);
|
429 | bb6834cf | aliguori | } |
430 | 5774cf98 | Mark McLoughlin | } while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
|
431 | 967f97fa | aliguori | |
432 | 42fb2e07 | Kevin Wolf | /* Now map what we have collected */
|
433 | 42fb2e07 | Kevin Wolf | virtqueue_map_sg(elem->in_sg, elem->in_addr, elem->in_num, 1);
|
434 | 42fb2e07 | Kevin Wolf | virtqueue_map_sg(elem->out_sg, elem->out_addr, elem->out_num, 0);
|
435 | 42fb2e07 | Kevin Wolf | |
436 | 967f97fa | aliguori | elem->index = head; |
437 | 967f97fa | aliguori | |
438 | 967f97fa | aliguori | vq->inuse++; |
439 | 967f97fa | aliguori | |
440 | 64979a4d | Stefan Hajnoczi | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
441 | 967f97fa | aliguori | return elem->in_num + elem->out_num;
|
442 | 967f97fa | aliguori | } |
443 | 967f97fa | aliguori | |
444 | 967f97fa | aliguori | /* virtio device */
|
445 | 7055e687 | Michael S. Tsirkin | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
446 | 7055e687 | Michael S. Tsirkin | { |
447 | 7055e687 | Michael S. Tsirkin | if (vdev->binding->notify) {
|
448 | 7055e687 | Michael S. Tsirkin | vdev->binding->notify(vdev->binding_opaque, vector); |
449 | 7055e687 | Michael S. Tsirkin | } |
450 | 7055e687 | Michael S. Tsirkin | } |
451 | 967f97fa | aliguori | |
452 | 53c25cea | Paul Brook | void virtio_update_irq(VirtIODevice *vdev)
|
453 | 967f97fa | aliguori | { |
454 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
455 | 967f97fa | aliguori | } |
456 | 967f97fa | aliguori | |
457 | 53c25cea | Paul Brook | void virtio_reset(void *opaque) |
458 | 967f97fa | aliguori | { |
459 | 967f97fa | aliguori | VirtIODevice *vdev = opaque; |
460 | 967f97fa | aliguori | int i;
|
461 | 967f97fa | aliguori | |
462 | e0c472d8 | Michael S. Tsirkin | virtio_set_status(vdev, 0);
|
463 | e0c472d8 | Michael S. Tsirkin | |
464 | 967f97fa | aliguori | if (vdev->reset)
|
465 | 967f97fa | aliguori | vdev->reset(vdev); |
466 | 967f97fa | aliguori | |
467 | 704a76fc | Michael S. Tsirkin | vdev->guest_features = 0;
|
468 | 967f97fa | aliguori | vdev->queue_sel = 0;
|
469 | 967f97fa | aliguori | vdev->status = 0;
|
470 | 967f97fa | aliguori | vdev->isr = 0;
|
471 | 7055e687 | Michael S. Tsirkin | vdev->config_vector = VIRTIO_NO_VECTOR; |
472 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vdev->config_vector); |
473 | 967f97fa | aliguori | |
474 | 967f97fa | aliguori | for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
475 | 967f97fa | aliguori | vdev->vq[i].vring.desc = 0;
|
476 | 967f97fa | aliguori | vdev->vq[i].vring.avail = 0;
|
477 | 967f97fa | aliguori | vdev->vq[i].vring.used = 0;
|
478 | 967f97fa | aliguori | vdev->vq[i].last_avail_idx = 0;
|
479 | 53c25cea | Paul Brook | vdev->vq[i].pa = 0;
|
480 | 7055e687 | Michael S. Tsirkin | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
481 | 967f97fa | aliguori | } |
482 | 967f97fa | aliguori | } |
483 | 967f97fa | aliguori | |
484 | 53c25cea | Paul Brook | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
485 | 967f97fa | aliguori | { |
486 | 967f97fa | aliguori | uint8_t val; |
487 | 967f97fa | aliguori | |
488 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
489 | 967f97fa | aliguori | |
490 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
491 | 967f97fa | aliguori | return (uint32_t)-1; |
492 | 967f97fa | aliguori | |
493 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
494 | 967f97fa | aliguori | return val;
|
495 | 967f97fa | aliguori | } |
496 | 967f97fa | aliguori | |
497 | 53c25cea | Paul Brook | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
498 | 967f97fa | aliguori | { |
499 | 967f97fa | aliguori | uint16_t val; |
500 | 967f97fa | aliguori | |
501 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
502 | 967f97fa | aliguori | |
503 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
504 | 967f97fa | aliguori | return (uint32_t)-1; |
505 | 967f97fa | aliguori | |
506 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
507 | 967f97fa | aliguori | return val;
|
508 | 967f97fa | aliguori | } |
509 | 967f97fa | aliguori | |
510 | 53c25cea | Paul Brook | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
511 | 967f97fa | aliguori | { |
512 | 967f97fa | aliguori | uint32_t val; |
513 | 967f97fa | aliguori | |
514 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
515 | 967f97fa | aliguori | |
516 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
517 | 967f97fa | aliguori | return (uint32_t)-1; |
518 | 967f97fa | aliguori | |
519 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
520 | 967f97fa | aliguori | return val;
|
521 | 967f97fa | aliguori | } |
522 | 967f97fa | aliguori | |
523 | 53c25cea | Paul Brook | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
524 | 967f97fa | aliguori | { |
525 | 967f97fa | aliguori | uint8_t val = data; |
526 | 967f97fa | aliguori | |
527 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
528 | 967f97fa | aliguori | return;
|
529 | 967f97fa | aliguori | |
530 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
531 | 967f97fa | aliguori | |
532 | 967f97fa | aliguori | if (vdev->set_config)
|
533 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
534 | 967f97fa | aliguori | } |
535 | 967f97fa | aliguori | |
536 | 53c25cea | Paul Brook | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
537 | 967f97fa | aliguori | { |
538 | 967f97fa | aliguori | uint16_t val = data; |
539 | 967f97fa | aliguori | |
540 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
541 | 967f97fa | aliguori | return;
|
542 | 967f97fa | aliguori | |
543 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
544 | 967f97fa | aliguori | |
545 | 967f97fa | aliguori | if (vdev->set_config)
|
546 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
547 | 967f97fa | aliguori | } |
548 | 967f97fa | aliguori | |
549 | 53c25cea | Paul Brook | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
550 | 967f97fa | aliguori | { |
551 | 967f97fa | aliguori | uint32_t val = data; |
552 | 967f97fa | aliguori | |
553 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
554 | 967f97fa | aliguori | return;
|
555 | 967f97fa | aliguori | |
556 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
557 | 967f97fa | aliguori | |
558 | 967f97fa | aliguori | if (vdev->set_config)
|
559 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
560 | 967f97fa | aliguori | } |
561 | 967f97fa | aliguori | |
562 | c227f099 | Anthony Liguori | void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr) |
563 | 967f97fa | aliguori | { |
564 | 7055e687 | Michael S. Tsirkin | vdev->vq[n].pa = addr; |
565 | 7055e687 | Michael S. Tsirkin | virtqueue_init(&vdev->vq[n]); |
566 | 53c25cea | Paul Brook | } |
567 | 53c25cea | Paul Brook | |
568 | c227f099 | Anthony Liguori | target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
569 | 53c25cea | Paul Brook | { |
570 | 53c25cea | Paul Brook | return vdev->vq[n].pa;
|
571 | 53c25cea | Paul Brook | } |
572 | 53c25cea | Paul Brook | |
573 | 53c25cea | Paul Brook | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
574 | 53c25cea | Paul Brook | { |
575 | 53c25cea | Paul Brook | return vdev->vq[n].vring.num;
|
576 | 53c25cea | Paul Brook | } |
577 | 967f97fa | aliguori | |
578 | 25db9ebe | Stefan Hajnoczi | void virtio_queue_notify_vq(VirtQueue *vq)
|
579 | 25db9ebe | Stefan Hajnoczi | { |
580 | 25db9ebe | Stefan Hajnoczi | if (vq->vring.desc) {
|
581 | 25db9ebe | Stefan Hajnoczi | VirtIODevice *vdev = vq->vdev; |
582 | 25db9ebe | Stefan Hajnoczi | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
583 | 25db9ebe | Stefan Hajnoczi | vq->handle_output(vdev, vq); |
584 | 25db9ebe | Stefan Hajnoczi | } |
585 | 25db9ebe | Stefan Hajnoczi | } |
586 | 25db9ebe | Stefan Hajnoczi | |
587 | 53c25cea | Paul Brook | void virtio_queue_notify(VirtIODevice *vdev, int n) |
588 | 53c25cea | Paul Brook | { |
589 | 25db9ebe | Stefan Hajnoczi | if (n < VIRTIO_PCI_QUEUE_MAX) {
|
590 | 25db9ebe | Stefan Hajnoczi | virtio_queue_notify_vq(&vdev->vq[n]); |
591 | 967f97fa | aliguori | } |
592 | 967f97fa | aliguori | } |
593 | 967f97fa | aliguori | |
594 | 7055e687 | Michael S. Tsirkin | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n)
|
595 | 7055e687 | Michael S. Tsirkin | { |
596 | 7055e687 | Michael S. Tsirkin | return n < VIRTIO_PCI_QUEUE_MAX ? vdev->vq[n].vector :
|
597 | 7055e687 | Michael S. Tsirkin | VIRTIO_NO_VECTOR; |
598 | 7055e687 | Michael S. Tsirkin | } |
599 | 7055e687 | Michael S. Tsirkin | |
600 | 7055e687 | Michael S. Tsirkin | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) |
601 | 7055e687 | Michael S. Tsirkin | { |
602 | 7055e687 | Michael S. Tsirkin | if (n < VIRTIO_PCI_QUEUE_MAX)
|
603 | 7055e687 | Michael S. Tsirkin | vdev->vq[n].vector = vector; |
604 | 7055e687 | Michael S. Tsirkin | } |
605 | 7055e687 | Michael S. Tsirkin | |
606 | 967f97fa | aliguori | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
607 | 967f97fa | aliguori | void (*handle_output)(VirtIODevice *, VirtQueue *))
|
608 | 967f97fa | aliguori | { |
609 | 967f97fa | aliguori | int i;
|
610 | 967f97fa | aliguori | |
611 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
612 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
613 | 967f97fa | aliguori | break;
|
614 | 967f97fa | aliguori | } |
615 | 967f97fa | aliguori | |
616 | 967f97fa | aliguori | if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
617 | 967f97fa | aliguori | abort(); |
618 | 967f97fa | aliguori | |
619 | 967f97fa | aliguori | vdev->vq[i].vring.num = queue_size; |
620 | 967f97fa | aliguori | vdev->vq[i].handle_output = handle_output; |
621 | 967f97fa | aliguori | |
622 | 967f97fa | aliguori | return &vdev->vq[i];
|
623 | 967f97fa | aliguori | } |
624 | 967f97fa | aliguori | |
625 | 1cbdabe2 | Michael S. Tsirkin | void virtio_irq(VirtQueue *vq)
|
626 | 1cbdabe2 | Michael S. Tsirkin | { |
627 | 64979a4d | Stefan Hajnoczi | trace_virtio_irq(vq); |
628 | 1cbdabe2 | Michael S. Tsirkin | vq->vdev->isr |= 0x01;
|
629 | 1cbdabe2 | Michael S. Tsirkin | virtio_notify_vector(vq->vdev, vq->vector); |
630 | 1cbdabe2 | Michael S. Tsirkin | } |
631 | 1cbdabe2 | Michael S. Tsirkin | |
632 | 967f97fa | aliguori | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
633 | 967f97fa | aliguori | { |
634 | 97b83deb | aliguori | /* Always notify when queue is empty (when feature acknowledge) */
|
635 | 97b83deb | aliguori | if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
|
636 | 704a76fc | Michael S. Tsirkin | (!(vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
|
637 | 97b83deb | aliguori | (vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx))) |
638 | 967f97fa | aliguori | return;
|
639 | 967f97fa | aliguori | |
640 | 64979a4d | Stefan Hajnoczi | trace_virtio_notify(vdev, vq); |
641 | 967f97fa | aliguori | vdev->isr |= 0x01;
|
642 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vq->vector); |
643 | 967f97fa | aliguori | } |
644 | 967f97fa | aliguori | |
645 | 967f97fa | aliguori | void virtio_notify_config(VirtIODevice *vdev)
|
646 | 967f97fa | aliguori | { |
647 | 7625162c | aliguori | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
648 | 7625162c | aliguori | return;
|
649 | 7625162c | aliguori | |
650 | 967f97fa | aliguori | vdev->isr |= 0x03;
|
651 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vdev->config_vector); |
652 | 967f97fa | aliguori | } |
653 | 967f97fa | aliguori | |
654 | 967f97fa | aliguori | void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
655 | 967f97fa | aliguori | { |
656 | 967f97fa | aliguori | int i;
|
657 | 967f97fa | aliguori | |
658 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->save_config)
|
659 | ff24bd58 | Michael S. Tsirkin | vdev->binding->save_config(vdev->binding_opaque, f); |
660 | 967f97fa | aliguori | |
661 | 967f97fa | aliguori | qemu_put_8s(f, &vdev->status); |
662 | 967f97fa | aliguori | qemu_put_8s(f, &vdev->isr); |
663 | 967f97fa | aliguori | qemu_put_be16s(f, &vdev->queue_sel); |
664 | 704a76fc | Michael S. Tsirkin | qemu_put_be32s(f, &vdev->guest_features); |
665 | 967f97fa | aliguori | qemu_put_be32(f, vdev->config_len); |
666 | 967f97fa | aliguori | qemu_put_buffer(f, vdev->config, vdev->config_len); |
667 | 967f97fa | aliguori | |
668 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
669 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
670 | 967f97fa | aliguori | break;
|
671 | 967f97fa | aliguori | } |
672 | 967f97fa | aliguori | |
673 | 967f97fa | aliguori | qemu_put_be32(f, i); |
674 | 967f97fa | aliguori | |
675 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
676 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
677 | 967f97fa | aliguori | break;
|
678 | 967f97fa | aliguori | |
679 | 967f97fa | aliguori | qemu_put_be32(f, vdev->vq[i].vring.num); |
680 | 53c25cea | Paul Brook | qemu_put_be64(f, vdev->vq[i].pa); |
681 | 967f97fa | aliguori | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
682 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->save_queue)
|
683 | ff24bd58 | Michael S. Tsirkin | vdev->binding->save_queue(vdev->binding_opaque, i, f); |
684 | 967f97fa | aliguori | } |
685 | 967f97fa | aliguori | } |
686 | 967f97fa | aliguori | |
687 | ff24bd58 | Michael S. Tsirkin | int virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
688 | 967f97fa | aliguori | { |
689 | ff24bd58 | Michael S. Tsirkin | int num, i, ret;
|
690 | 6d74ca5a | Michael S. Tsirkin | uint32_t features; |
691 | 8172539d | Michael S. Tsirkin | uint32_t supported_features = |
692 | 6d74ca5a | Michael S. Tsirkin | vdev->binding->get_features(vdev->binding_opaque); |
693 | 967f97fa | aliguori | |
694 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->load_config) {
|
695 | ff24bd58 | Michael S. Tsirkin | ret = vdev->binding->load_config(vdev->binding_opaque, f); |
696 | ff24bd58 | Michael S. Tsirkin | if (ret)
|
697 | ff24bd58 | Michael S. Tsirkin | return ret;
|
698 | ff24bd58 | Michael S. Tsirkin | } |
699 | 967f97fa | aliguori | |
700 | 967f97fa | aliguori | qemu_get_8s(f, &vdev->status); |
701 | 967f97fa | aliguori | qemu_get_8s(f, &vdev->isr); |
702 | 967f97fa | aliguori | qemu_get_be16s(f, &vdev->queue_sel); |
703 | 6d74ca5a | Michael S. Tsirkin | qemu_get_be32s(f, &features); |
704 | 6d74ca5a | Michael S. Tsirkin | if (features & ~supported_features) {
|
705 | ce67ed65 | Stefan Hajnoczi | error_report("Features 0x%x unsupported. Allowed features: 0x%x",
|
706 | ce67ed65 | Stefan Hajnoczi | features, supported_features); |
707 | 6d74ca5a | Michael S. Tsirkin | return -1; |
708 | 6d74ca5a | Michael S. Tsirkin | } |
709 | fae054b0 | Michael S. Tsirkin | if (vdev->set_features)
|
710 | fae054b0 | Michael S. Tsirkin | vdev->set_features(vdev, features); |
711 | 704a76fc | Michael S. Tsirkin | vdev->guest_features = features; |
712 | 967f97fa | aliguori | vdev->config_len = qemu_get_be32(f); |
713 | 967f97fa | aliguori | qemu_get_buffer(f, vdev->config, vdev->config_len); |
714 | 967f97fa | aliguori | |
715 | 967f97fa | aliguori | num = qemu_get_be32(f); |
716 | 967f97fa | aliguori | |
717 | 967f97fa | aliguori | for (i = 0; i < num; i++) { |
718 | 967f97fa | aliguori | vdev->vq[i].vring.num = qemu_get_be32(f); |
719 | 53c25cea | Paul Brook | vdev->vq[i].pa = qemu_get_be64(f); |
720 | 967f97fa | aliguori | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
721 | 967f97fa | aliguori | |
722 | 53c25cea | Paul Brook | if (vdev->vq[i].pa) {
|
723 | 1abeb5a6 | Michael S. Tsirkin | uint16_t nheads; |
724 | 53c25cea | Paul Brook | virtqueue_init(&vdev->vq[i]); |
725 | 1abeb5a6 | Michael S. Tsirkin | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; |
726 | 1abeb5a6 | Michael S. Tsirkin | /* Check it isn't doing very strange things with descriptor numbers. */
|
727 | 1abeb5a6 | Michael S. Tsirkin | if (nheads > vdev->vq[i].vring.num) {
|
728 | 1abeb5a6 | Michael S. Tsirkin | error_report("VQ %d size 0x%x Guest index 0x%x "
|
729 | 1abeb5a6 | Michael S. Tsirkin | "inconsistent with Host index 0x%x: delta 0x%x\n",
|
730 | 1abeb5a6 | Michael S. Tsirkin | i, vdev->vq[i].vring.num, |
731 | 1abeb5a6 | Michael S. Tsirkin | vring_avail_idx(&vdev->vq[i]), |
732 | 1abeb5a6 | Michael S. Tsirkin | vdev->vq[i].last_avail_idx, nheads); |
733 | 1abeb5a6 | Michael S. Tsirkin | return -1; |
734 | 1abeb5a6 | Michael S. Tsirkin | } |
735 | 1abeb5a6 | Michael S. Tsirkin | } else if (vdev->vq[i].last_avail_idx) { |
736 | 1abeb5a6 | Michael S. Tsirkin | error_report("VQ %d address 0x0 "
|
737 | 1abeb5a6 | Michael S. Tsirkin | "inconsistent with Host index 0x%x\n",
|
738 | 1abeb5a6 | Michael S. Tsirkin | i, vdev->vq[i].last_avail_idx); |
739 | 1abeb5a6 | Michael S. Tsirkin | return -1; |
740 | 258dc7c9 | Michael S. Tsirkin | } |
741 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->load_queue) {
|
742 | ff24bd58 | Michael S. Tsirkin | ret = vdev->binding->load_queue(vdev->binding_opaque, i, f); |
743 | ff24bd58 | Michael S. Tsirkin | if (ret)
|
744 | ff24bd58 | Michael S. Tsirkin | return ret;
|
745 | 7055e687 | Michael S. Tsirkin | } |
746 | 967f97fa | aliguori | } |
747 | 967f97fa | aliguori | |
748 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
749 | ff24bd58 | Michael S. Tsirkin | return 0; |
750 | 967f97fa | aliguori | } |
751 | 967f97fa | aliguori | |
752 | b946a153 | aliguori | void virtio_cleanup(VirtIODevice *vdev)
|
753 | b946a153 | aliguori | { |
754 | 85cf2a8d | Michael S. Tsirkin | qemu_del_vm_change_state_handler(vdev->vmstate); |
755 | b946a153 | aliguori | if (vdev->config)
|
756 | b946a153 | aliguori | qemu_free(vdev->config); |
757 | b946a153 | aliguori | qemu_free(vdev->vq); |
758 | b946a153 | aliguori | } |
759 | b946a153 | aliguori | |
760 | 85cf2a8d | Michael S. Tsirkin | static void virtio_vmstate_change(void *opaque, int running, int reason) |
761 | 85cf2a8d | Michael S. Tsirkin | { |
762 | 85cf2a8d | Michael S. Tsirkin | VirtIODevice *vdev = opaque; |
763 | 85cf2a8d | Michael S. Tsirkin | bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK);
|
764 | 85cf2a8d | Michael S. Tsirkin | vdev->vm_running = running; |
765 | 85cf2a8d | Michael S. Tsirkin | |
766 | 85cf2a8d | Michael S. Tsirkin | if (backend_run) {
|
767 | 85cf2a8d | Michael S. Tsirkin | virtio_set_status(vdev, vdev->status); |
768 | 85cf2a8d | Michael S. Tsirkin | } |
769 | 85cf2a8d | Michael S. Tsirkin | |
770 | 85cf2a8d | Michael S. Tsirkin | if (vdev->binding->vmstate_change) {
|
771 | 85cf2a8d | Michael S. Tsirkin | vdev->binding->vmstate_change(vdev->binding_opaque, backend_run); |
772 | 85cf2a8d | Michael S. Tsirkin | } |
773 | 85cf2a8d | Michael S. Tsirkin | |
774 | 85cf2a8d | Michael S. Tsirkin | if (!backend_run) {
|
775 | 85cf2a8d | Michael S. Tsirkin | virtio_set_status(vdev, vdev->status); |
776 | 85cf2a8d | Michael S. Tsirkin | } |
777 | 85cf2a8d | Michael S. Tsirkin | } |
778 | 85cf2a8d | Michael S. Tsirkin | |
779 | 53c25cea | Paul Brook | VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, |
780 | 53c25cea | Paul Brook | size_t config_size, size_t struct_size) |
781 | 967f97fa | aliguori | { |
782 | 967f97fa | aliguori | VirtIODevice *vdev; |
783 | b8193adb | Michael S. Tsirkin | int i;
|
784 | 967f97fa | aliguori | |
785 | 53c25cea | Paul Brook | vdev = qemu_mallocz(struct_size); |
786 | 967f97fa | aliguori | |
787 | 53c25cea | Paul Brook | vdev->device_id = device_id; |
788 | 967f97fa | aliguori | vdev->status = 0;
|
789 | 967f97fa | aliguori | vdev->isr = 0;
|
790 | 967f97fa | aliguori | vdev->queue_sel = 0;
|
791 | 7055e687 | Michael S. Tsirkin | vdev->config_vector = VIRTIO_NO_VECTOR; |
792 | 967f97fa | aliguori | vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
793 | 1cbdabe2 | Michael S. Tsirkin | for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
794 | b8193adb | Michael S. Tsirkin | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
795 | 1cbdabe2 | Michael S. Tsirkin | vdev->vq[i].vdev = vdev; |
796 | 1cbdabe2 | Michael S. Tsirkin | } |
797 | 967f97fa | aliguori | |
798 | 967f97fa | aliguori | vdev->name = name; |
799 | 967f97fa | aliguori | vdev->config_len = config_size; |
800 | 967f97fa | aliguori | if (vdev->config_len)
|
801 | 967f97fa | aliguori | vdev->config = qemu_mallocz(config_size); |
802 | 967f97fa | aliguori | else
|
803 | 967f97fa | aliguori | vdev->config = NULL;
|
804 | 967f97fa | aliguori | |
805 | 85cf2a8d | Michael S. Tsirkin | vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change, vdev); |
806 | 85cf2a8d | Michael S. Tsirkin | |
807 | 967f97fa | aliguori | return vdev;
|
808 | 967f97fa | aliguori | } |
809 | 53c25cea | Paul Brook | |
810 | 53c25cea | Paul Brook | void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding, |
811 | 53c25cea | Paul Brook | void *opaque)
|
812 | 53c25cea | Paul Brook | { |
813 | 53c25cea | Paul Brook | vdev->binding = binding; |
814 | 53c25cea | Paul Brook | vdev->binding_opaque = opaque; |
815 | 53c25cea | Paul Brook | } |
816 | 1cbdabe2 | Michael S. Tsirkin | |
817 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)
|
818 | 1cbdabe2 | Michael S. Tsirkin | { |
819 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.desc;
|
820 | 1cbdabe2 | Michael S. Tsirkin | } |
821 | 1cbdabe2 | Michael S. Tsirkin | |
822 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n)
|
823 | 1cbdabe2 | Michael S. Tsirkin | { |
824 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.avail;
|
825 | 1cbdabe2 | Michael S. Tsirkin | } |
826 | 1cbdabe2 | Michael S. Tsirkin | |
827 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n)
|
828 | 1cbdabe2 | Michael S. Tsirkin | { |
829 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.used;
|
830 | 1cbdabe2 | Michael S. Tsirkin | } |
831 | 1cbdabe2 | Michael S. Tsirkin | |
832 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n)
|
833 | 1cbdabe2 | Michael S. Tsirkin | { |
834 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.desc;
|
835 | 1cbdabe2 | Michael S. Tsirkin | } |
836 | 1cbdabe2 | Michael S. Tsirkin | |
837 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n)
|
838 | 1cbdabe2 | Michael S. Tsirkin | { |
839 | 1cbdabe2 | Michael S. Tsirkin | return sizeof(VRingDesc) * vdev->vq[n].vring.num; |
840 | 1cbdabe2 | Michael S. Tsirkin | } |
841 | 1cbdabe2 | Michael S. Tsirkin | |
842 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
|
843 | 1cbdabe2 | Michael S. Tsirkin | { |
844 | 1cbdabe2 | Michael S. Tsirkin | return offsetof(VRingAvail, ring) +
|
845 | 2b3af999 | Stefan Weil | sizeof(uint64_t) * vdev->vq[n].vring.num;
|
846 | 1cbdabe2 | Michael S. Tsirkin | } |
847 | 1cbdabe2 | Michael S. Tsirkin | |
848 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n)
|
849 | 1cbdabe2 | Michael S. Tsirkin | { |
850 | 1cbdabe2 | Michael S. Tsirkin | return offsetof(VRingUsed, ring) +
|
851 | 1cbdabe2 | Michael S. Tsirkin | sizeof(VRingUsedElem) * vdev->vq[n].vring.num;
|
852 | 1cbdabe2 | Michael S. Tsirkin | } |
853 | 1cbdabe2 | Michael S. Tsirkin | |
854 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n)
|
855 | 1cbdabe2 | Michael S. Tsirkin | { |
856 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.used - vdev->vq[n].vring.desc +
|
857 | 1cbdabe2 | Michael S. Tsirkin | virtio_queue_get_used_size(vdev, n); |
858 | 1cbdabe2 | Michael S. Tsirkin | } |
859 | 1cbdabe2 | Michael S. Tsirkin | |
860 | 1cbdabe2 | Michael S. Tsirkin | uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
|
861 | 1cbdabe2 | Michael S. Tsirkin | { |
862 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].last_avail_idx;
|
863 | 1cbdabe2 | Michael S. Tsirkin | } |
864 | 1cbdabe2 | Michael S. Tsirkin | |
865 | 1cbdabe2 | Michael S. Tsirkin | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) |
866 | 1cbdabe2 | Michael S. Tsirkin | { |
867 | 1cbdabe2 | Michael S. Tsirkin | vdev->vq[n].last_avail_idx = idx; |
868 | 1cbdabe2 | Michael S. Tsirkin | } |
869 | 1cbdabe2 | Michael S. Tsirkin | |
870 | 1cbdabe2 | Michael S. Tsirkin | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n)
|
871 | 1cbdabe2 | Michael S. Tsirkin | { |
872 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq + n;
|
873 | 1cbdabe2 | Michael S. Tsirkin | } |
874 | 1cbdabe2 | Michael S. Tsirkin | |
875 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
876 | 1cbdabe2 | Michael S. Tsirkin | { |
877 | 1cbdabe2 | Michael S. Tsirkin | return &vq->guest_notifier;
|
878 | 1cbdabe2 | Michael S. Tsirkin | } |
879 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
880 | 1cbdabe2 | Michael S. Tsirkin | { |
881 | 1cbdabe2 | Michael S. Tsirkin | return &vq->host_notifier;
|
882 | 1cbdabe2 | Michael S. Tsirkin | } |