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1 | 6e02c38d | aliguori | /*
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2 | 6e02c38d | aliguori | * Virtio Block Device
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3 | 6e02c38d | aliguori | *
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4 | 6e02c38d | aliguori | * Copyright IBM, Corp. 2007
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5 | 6e02c38d | aliguori | *
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6 | 6e02c38d | aliguori | * Authors:
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7 | 6e02c38d | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | 6e02c38d | aliguori | *
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9 | 6e02c38d | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 6e02c38d | aliguori | * the COPYING file in the top-level directory.
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11 | 6e02c38d | aliguori | *
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12 | 6e02c38d | aliguori | */
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13 | 6e02c38d | aliguori | |
14 | 869a5c6d | aliguori | #include <qemu-common.h> |
15 | 869a5c6d | aliguori | #include <sysemu.h> |
16 | 6e02c38d | aliguori | #include "virtio-blk.h" |
17 | 6e02c38d | aliguori | #include "block_int.h" |
18 | 1063b8b1 | Christoph Hellwig | #ifdef __linux__
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19 | 1063b8b1 | Christoph Hellwig | # include <scsi/sg.h> |
20 | 1063b8b1 | Christoph Hellwig | #endif
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21 | 6e02c38d | aliguori | |
22 | 6e02c38d | aliguori | typedef struct VirtIOBlock |
23 | 6e02c38d | aliguori | { |
24 | 6e02c38d | aliguori | VirtIODevice vdev; |
25 | 6e02c38d | aliguori | BlockDriverState *bs; |
26 | 6e02c38d | aliguori | VirtQueue *vq; |
27 | 869a5c6d | aliguori | void *rq;
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28 | 213189ab | Markus Armbruster | QEMUBH *bh; |
29 | 9752c371 | Christoph Hellwig | BlockConf *conf; |
30 | 6e02c38d | aliguori | } VirtIOBlock; |
31 | 6e02c38d | aliguori | |
32 | 6e02c38d | aliguori | static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev)
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33 | 6e02c38d | aliguori | { |
34 | 6e02c38d | aliguori | return (VirtIOBlock *)vdev;
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35 | 6e02c38d | aliguori | } |
36 | 6e02c38d | aliguori | |
37 | 6e02c38d | aliguori | typedef struct VirtIOBlockReq |
38 | 6e02c38d | aliguori | { |
39 | 6e02c38d | aliguori | VirtIOBlock *dev; |
40 | 6e02c38d | aliguori | VirtQueueElement elem; |
41 | 6e02c38d | aliguori | struct virtio_blk_inhdr *in;
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42 | 6e02c38d | aliguori | struct virtio_blk_outhdr *out;
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43 | 1063b8b1 | Christoph Hellwig | struct virtio_scsi_inhdr *scsi;
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44 | d28a1b6e | aliguori | QEMUIOVector qiov; |
45 | 869a5c6d | aliguori | struct VirtIOBlockReq *next;
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46 | 6e02c38d | aliguori | } VirtIOBlockReq; |
47 | 6e02c38d | aliguori | |
48 | 869a5c6d | aliguori | static void virtio_blk_req_complete(VirtIOBlockReq *req, int status) |
49 | 869a5c6d | aliguori | { |
50 | 869a5c6d | aliguori | VirtIOBlock *s = req->dev; |
51 | 869a5c6d | aliguori | |
52 | 869a5c6d | aliguori | req->in->status = status; |
53 | d28a1b6e | aliguori | virtqueue_push(s->vq, &req->elem, req->qiov.size + sizeof(*req->in));
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54 | 869a5c6d | aliguori | virtio_notify(&s->vdev, s->vq); |
55 | 869a5c6d | aliguori | |
56 | 869a5c6d | aliguori | qemu_free(req); |
57 | 869a5c6d | aliguori | } |
58 | 869a5c6d | aliguori | |
59 | f35d68f0 | Kevin Wolf | static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, |
60 | f35d68f0 | Kevin Wolf | int is_read)
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61 | 869a5c6d | aliguori | { |
62 | f35d68f0 | Kevin Wolf | BlockInterfaceErrorAction action = |
63 | f35d68f0 | Kevin Wolf | drive_get_on_error(req->dev->bs, is_read); |
64 | 869a5c6d | aliguori | VirtIOBlock *s = req->dev; |
65 | 869a5c6d | aliguori | |
66 | eaa6c85f | Luiz Capitulino | if (action == BLOCK_ERR_IGNORE) {
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67 | eaa6c85f | Luiz Capitulino | bdrv_mon_event(req->dev->bs, BDRV_ACTION_IGNORE, is_read); |
68 | 869a5c6d | aliguori | return 0; |
69 | eaa6c85f | Luiz Capitulino | } |
70 | 869a5c6d | aliguori | |
71 | 869a5c6d | aliguori | if ((error == ENOSPC && action == BLOCK_ERR_STOP_ENOSPC)
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72 | 869a5c6d | aliguori | || action == BLOCK_ERR_STOP_ANY) { |
73 | 869a5c6d | aliguori | req->next = s->rq; |
74 | 869a5c6d | aliguori | s->rq = req; |
75 | 869a5c6d | aliguori | vm_stop(0);
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76 | eaa6c85f | Luiz Capitulino | bdrv_mon_event(req->dev->bs, BDRV_ACTION_STOP, is_read); |
77 | 869a5c6d | aliguori | } else {
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78 | 869a5c6d | aliguori | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
79 | eaa6c85f | Luiz Capitulino | bdrv_mon_event(req->dev->bs, BDRV_ACTION_REPORT, is_read); |
80 | 869a5c6d | aliguori | } |
81 | 869a5c6d | aliguori | |
82 | 869a5c6d | aliguori | return 1; |
83 | 869a5c6d | aliguori | } |
84 | 869a5c6d | aliguori | |
85 | 6e02c38d | aliguori | static void virtio_blk_rw_complete(void *opaque, int ret) |
86 | 6e02c38d | aliguori | { |
87 | 6e02c38d | aliguori | VirtIOBlockReq *req = opaque; |
88 | 6e02c38d | aliguori | |
89 | f35d68f0 | Kevin Wolf | if (ret) {
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90 | f35d68f0 | Kevin Wolf | int is_read = !(req->out->type & VIRTIO_BLK_T_OUT);
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91 | f35d68f0 | Kevin Wolf | if (virtio_blk_handle_rw_error(req, -ret, is_read))
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92 | 869a5c6d | aliguori | return;
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93 | 6e02c38d | aliguori | } |
94 | 6e02c38d | aliguori | |
95 | f35d68f0 | Kevin Wolf | virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
96 | 869a5c6d | aliguori | } |
97 | 6e02c38d | aliguori | |
98 | aa659be3 | Christoph Hellwig | static void virtio_blk_flush_complete(void *opaque, int ret) |
99 | aa659be3 | Christoph Hellwig | { |
100 | aa659be3 | Christoph Hellwig | VirtIOBlockReq *req = opaque; |
101 | aa659be3 | Christoph Hellwig | |
102 | aa659be3 | Christoph Hellwig | virtio_blk_req_complete(req, ret ? VIRTIO_BLK_S_IOERR : VIRTIO_BLK_S_OK); |
103 | aa659be3 | Christoph Hellwig | } |
104 | aa659be3 | Christoph Hellwig | |
105 | 869a5c6d | aliguori | static VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s)
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106 | 869a5c6d | aliguori | { |
107 | 869a5c6d | aliguori | VirtIOBlockReq *req = qemu_mallocz(sizeof(*req));
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108 | 487414f1 | aliguori | req->dev = s; |
109 | 869a5c6d | aliguori | return req;
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110 | 6e02c38d | aliguori | } |
111 | 6e02c38d | aliguori | |
112 | 6e02c38d | aliguori | static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s)
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113 | 6e02c38d | aliguori | { |
114 | 869a5c6d | aliguori | VirtIOBlockReq *req = virtio_blk_alloc_request(s); |
115 | 6e02c38d | aliguori | |
116 | 869a5c6d | aliguori | if (req != NULL) { |
117 | 869a5c6d | aliguori | if (!virtqueue_pop(s->vq, &req->elem)) {
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118 | 869a5c6d | aliguori | qemu_free(req); |
119 | 869a5c6d | aliguori | return NULL; |
120 | 869a5c6d | aliguori | } |
121 | 6e02c38d | aliguori | } |
122 | 6e02c38d | aliguori | |
123 | 6e02c38d | aliguori | return req;
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124 | 6e02c38d | aliguori | } |
125 | 6e02c38d | aliguori | |
126 | 1063b8b1 | Christoph Hellwig | #ifdef __linux__
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127 | 1063b8b1 | Christoph Hellwig | static void virtio_blk_handle_scsi(VirtIOBlockReq *req) |
128 | 1063b8b1 | Christoph Hellwig | { |
129 | 1063b8b1 | Christoph Hellwig | struct sg_io_hdr hdr;
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130 | 4277906d | Christoph Hellwig | int ret;
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131 | 1063b8b1 | Christoph Hellwig | int status;
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132 | 1063b8b1 | Christoph Hellwig | int i;
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133 | 1063b8b1 | Christoph Hellwig | |
134 | 1063b8b1 | Christoph Hellwig | /*
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135 | 1063b8b1 | Christoph Hellwig | * We require at least one output segment each for the virtio_blk_outhdr
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136 | 1063b8b1 | Christoph Hellwig | * and the SCSI command block.
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137 | 1063b8b1 | Christoph Hellwig | *
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138 | 1063b8b1 | Christoph Hellwig | * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr
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139 | 1063b8b1 | Christoph Hellwig | * and the sense buffer pointer in the input segments.
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140 | 1063b8b1 | Christoph Hellwig | */
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141 | 1063b8b1 | Christoph Hellwig | if (req->elem.out_num < 2 || req->elem.in_num < 3) { |
142 | 1063b8b1 | Christoph Hellwig | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
143 | 1063b8b1 | Christoph Hellwig | return;
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144 | 1063b8b1 | Christoph Hellwig | } |
145 | 1063b8b1 | Christoph Hellwig | |
146 | 1063b8b1 | Christoph Hellwig | /*
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147 | 1063b8b1 | Christoph Hellwig | * No support for bidirection commands yet.
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148 | 1063b8b1 | Christoph Hellwig | */
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149 | 1063b8b1 | Christoph Hellwig | if (req->elem.out_num > 2 && req->elem.in_num > 3) { |
150 | 1063b8b1 | Christoph Hellwig | virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); |
151 | 1063b8b1 | Christoph Hellwig | return;
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152 | 1063b8b1 | Christoph Hellwig | } |
153 | 1063b8b1 | Christoph Hellwig | |
154 | 1063b8b1 | Christoph Hellwig | /*
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155 | 1063b8b1 | Christoph Hellwig | * The scsi inhdr is placed in the second-to-last input segment, just
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156 | 1063b8b1 | Christoph Hellwig | * before the regular inhdr.
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157 | 1063b8b1 | Christoph Hellwig | */
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158 | 1063b8b1 | Christoph Hellwig | req->scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base; |
159 | 1063b8b1 | Christoph Hellwig | |
160 | 1063b8b1 | Christoph Hellwig | memset(&hdr, 0, sizeof(struct sg_io_hdr)); |
161 | 1063b8b1 | Christoph Hellwig | hdr.interface_id = 'S';
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162 | 1063b8b1 | Christoph Hellwig | hdr.cmd_len = req->elem.out_sg[1].iov_len;
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163 | 1063b8b1 | Christoph Hellwig | hdr.cmdp = req->elem.out_sg[1].iov_base;
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164 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_len = 0;
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165 | 1063b8b1 | Christoph Hellwig | |
166 | 1063b8b1 | Christoph Hellwig | if (req->elem.out_num > 2) { |
167 | 1063b8b1 | Christoph Hellwig | /*
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168 | 1063b8b1 | Christoph Hellwig | * If there are more than the minimally required 2 output segments
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169 | 1063b8b1 | Christoph Hellwig | * there is write payload starting from the third iovec.
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170 | 1063b8b1 | Christoph Hellwig | */
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171 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_direction = SG_DXFER_TO_DEV; |
172 | 1063b8b1 | Christoph Hellwig | hdr.iovec_count = req->elem.out_num - 2;
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173 | 1063b8b1 | Christoph Hellwig | |
174 | 1063b8b1 | Christoph Hellwig | for (i = 0; i < hdr.iovec_count; i++) |
175 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_len += req->elem.out_sg[i + 2].iov_len;
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176 | 1063b8b1 | Christoph Hellwig | |
177 | 1063b8b1 | Christoph Hellwig | hdr.dxferp = req->elem.out_sg + 2;
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178 | 1063b8b1 | Christoph Hellwig | |
179 | 1063b8b1 | Christoph Hellwig | } else if (req->elem.in_num > 3) { |
180 | 1063b8b1 | Christoph Hellwig | /*
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181 | 1063b8b1 | Christoph Hellwig | * If we have more than 3 input segments the guest wants to actually
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182 | 1063b8b1 | Christoph Hellwig | * read data.
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183 | 1063b8b1 | Christoph Hellwig | */
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184 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_direction = SG_DXFER_FROM_DEV; |
185 | 1063b8b1 | Christoph Hellwig | hdr.iovec_count = req->elem.in_num - 3;
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186 | 1063b8b1 | Christoph Hellwig | for (i = 0; i < hdr.iovec_count; i++) |
187 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_len += req->elem.in_sg[i].iov_len; |
188 | 1063b8b1 | Christoph Hellwig | |
189 | 1063b8b1 | Christoph Hellwig | hdr.dxferp = req->elem.in_sg; |
190 | 1063b8b1 | Christoph Hellwig | } else {
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191 | 1063b8b1 | Christoph Hellwig | /*
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192 | 1063b8b1 | Christoph Hellwig | * Some SCSI commands don't actually transfer any data.
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193 | 1063b8b1 | Christoph Hellwig | */
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194 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_direction = SG_DXFER_NONE; |
195 | 1063b8b1 | Christoph Hellwig | } |
196 | 1063b8b1 | Christoph Hellwig | |
197 | 1063b8b1 | Christoph Hellwig | hdr.sbp = req->elem.in_sg[req->elem.in_num - 3].iov_base;
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198 | 1063b8b1 | Christoph Hellwig | hdr.mx_sb_len = req->elem.in_sg[req->elem.in_num - 3].iov_len;
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199 | 1063b8b1 | Christoph Hellwig | |
200 | 1063b8b1 | Christoph Hellwig | ret = bdrv_ioctl(req->dev->bs, SG_IO, &hdr); |
201 | 1063b8b1 | Christoph Hellwig | if (ret) {
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202 | 1063b8b1 | Christoph Hellwig | status = VIRTIO_BLK_S_UNSUPP; |
203 | 1063b8b1 | Christoph Hellwig | hdr.status = ret; |
204 | 1063b8b1 | Christoph Hellwig | hdr.resid = hdr.dxfer_len; |
205 | 1063b8b1 | Christoph Hellwig | } else if (hdr.status) { |
206 | 1063b8b1 | Christoph Hellwig | status = VIRTIO_BLK_S_IOERR; |
207 | 1063b8b1 | Christoph Hellwig | } else {
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208 | 1063b8b1 | Christoph Hellwig | status = VIRTIO_BLK_S_OK; |
209 | 1063b8b1 | Christoph Hellwig | } |
210 | 1063b8b1 | Christoph Hellwig | |
211 | 1063b8b1 | Christoph Hellwig | req->scsi->errors = hdr.status; |
212 | 1063b8b1 | Christoph Hellwig | req->scsi->residual = hdr.resid; |
213 | 1063b8b1 | Christoph Hellwig | req->scsi->sense_len = hdr.sb_len_wr; |
214 | 1063b8b1 | Christoph Hellwig | req->scsi->data_len = hdr.dxfer_len; |
215 | 1063b8b1 | Christoph Hellwig | |
216 | 1063b8b1 | Christoph Hellwig | virtio_blk_req_complete(req, status); |
217 | 1063b8b1 | Christoph Hellwig | } |
218 | 1063b8b1 | Christoph Hellwig | #else
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219 | 1063b8b1 | Christoph Hellwig | static void virtio_blk_handle_scsi(VirtIOBlockReq *req) |
220 | 1063b8b1 | Christoph Hellwig | { |
221 | 1063b8b1 | Christoph Hellwig | virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); |
222 | 1063b8b1 | Christoph Hellwig | } |
223 | 1063b8b1 | Christoph Hellwig | #endif /* __linux__ */ |
224 | 1063b8b1 | Christoph Hellwig | |
225 | 91553dcc | Kevin Wolf | static void do_multiwrite(BlockDriverState *bs, BlockRequest *blkreq, |
226 | 91553dcc | Kevin Wolf | int num_writes)
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227 | 869a5c6d | aliguori | { |
228 | 91553dcc | Kevin Wolf | int i, ret;
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229 | 91553dcc | Kevin Wolf | ret = bdrv_aio_multiwrite(bs, blkreq, num_writes); |
230 | 91553dcc | Kevin Wolf | |
231 | 91553dcc | Kevin Wolf | if (ret != 0) { |
232 | 91553dcc | Kevin Wolf | for (i = 0; i < num_writes; i++) { |
233 | 91553dcc | Kevin Wolf | if (blkreq[i].error) {
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234 | 6c510fbf | Kevin Wolf | virtio_blk_rw_complete(blkreq[i].opaque, -EIO); |
235 | 91553dcc | Kevin Wolf | } |
236 | 91553dcc | Kevin Wolf | } |
237 | 91553dcc | Kevin Wolf | } |
238 | 91553dcc | Kevin Wolf | } |
239 | 87b245db | Christoph Hellwig | |
240 | aa659be3 | Christoph Hellwig | static void virtio_blk_handle_flush(VirtIOBlockReq *req) |
241 | aa659be3 | Christoph Hellwig | { |
242 | aa659be3 | Christoph Hellwig | BlockDriverAIOCB *acb; |
243 | aa659be3 | Christoph Hellwig | |
244 | aa659be3 | Christoph Hellwig | acb = bdrv_aio_flush(req->dev->bs, virtio_blk_flush_complete, req); |
245 | aa659be3 | Christoph Hellwig | if (!acb) {
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246 | aa659be3 | Christoph Hellwig | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
247 | aa659be3 | Christoph Hellwig | } |
248 | aa659be3 | Christoph Hellwig | } |
249 | aa659be3 | Christoph Hellwig | |
250 | 91553dcc | Kevin Wolf | static void virtio_blk_handle_write(BlockRequest *blkreq, int *num_writes, |
251 | 91553dcc | Kevin Wolf | VirtIOBlockReq *req, BlockDriverState **old_bs) |
252 | 91553dcc | Kevin Wolf | { |
253 | 91553dcc | Kevin Wolf | if (req->dev->bs != *old_bs || *num_writes == 32) { |
254 | 91553dcc | Kevin Wolf | if (*old_bs != NULL) { |
255 | 91553dcc | Kevin Wolf | do_multiwrite(*old_bs, blkreq, *num_writes); |
256 | 91553dcc | Kevin Wolf | } |
257 | 91553dcc | Kevin Wolf | *num_writes = 0;
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258 | 91553dcc | Kevin Wolf | *old_bs = req->dev->bs; |
259 | 87b245db | Christoph Hellwig | } |
260 | 91553dcc | Kevin Wolf | |
261 | 91553dcc | Kevin Wolf | blkreq[*num_writes].sector = req->out->sector; |
262 | 91553dcc | Kevin Wolf | blkreq[*num_writes].nb_sectors = req->qiov.size / 512;
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263 | 91553dcc | Kevin Wolf | blkreq[*num_writes].qiov = &req->qiov; |
264 | 91553dcc | Kevin Wolf | blkreq[*num_writes].cb = virtio_blk_rw_complete; |
265 | 91553dcc | Kevin Wolf | blkreq[*num_writes].opaque = req; |
266 | 91553dcc | Kevin Wolf | blkreq[*num_writes].error = 0;
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267 | 91553dcc | Kevin Wolf | |
268 | 91553dcc | Kevin Wolf | (*num_writes)++; |
269 | d28a1b6e | aliguori | } |
270 | 869a5c6d | aliguori | |
271 | d28a1b6e | aliguori | static void virtio_blk_handle_read(VirtIOBlockReq *req) |
272 | d28a1b6e | aliguori | { |
273 | 87b245db | Christoph Hellwig | BlockDriverAIOCB *acb; |
274 | 87b245db | Christoph Hellwig | |
275 | 87b245db | Christoph Hellwig | acb = bdrv_aio_readv(req->dev->bs, req->out->sector, &req->qiov, |
276 | 87b245db | Christoph Hellwig | req->qiov.size / 512, virtio_blk_rw_complete, req);
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277 | 87b245db | Christoph Hellwig | if (!acb) {
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278 | 6c510fbf | Kevin Wolf | virtio_blk_rw_complete(req, -EIO); |
279 | 87b245db | Christoph Hellwig | } |
280 | 869a5c6d | aliguori | } |
281 | 869a5c6d | aliguori | |
282 | bc6694d4 | Kevin Wolf | typedef struct MultiReqBuffer { |
283 | bc6694d4 | Kevin Wolf | BlockRequest blkreq[32];
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284 | bc6694d4 | Kevin Wolf | int num_writes;
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285 | bc6694d4 | Kevin Wolf | BlockDriverState *old_bs; |
286 | bc6694d4 | Kevin Wolf | } MultiReqBuffer; |
287 | bc6694d4 | Kevin Wolf | |
288 | bc6694d4 | Kevin Wolf | static void virtio_blk_handle_request(VirtIOBlockReq *req, |
289 | bc6694d4 | Kevin Wolf | MultiReqBuffer *mrb) |
290 | bc6694d4 | Kevin Wolf | { |
291 | bc6694d4 | Kevin Wolf | if (req->elem.out_num < 1 || req->elem.in_num < 1) { |
292 | bc6694d4 | Kevin Wolf | fprintf(stderr, "virtio-blk missing headers\n");
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293 | bc6694d4 | Kevin Wolf | exit(1);
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294 | bc6694d4 | Kevin Wolf | } |
295 | bc6694d4 | Kevin Wolf | |
296 | bc6694d4 | Kevin Wolf | if (req->elem.out_sg[0].iov_len < sizeof(*req->out) || |
297 | bc6694d4 | Kevin Wolf | req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) { |
298 | bc6694d4 | Kevin Wolf | fprintf(stderr, "virtio-blk header not in correct element\n");
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299 | bc6694d4 | Kevin Wolf | exit(1);
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300 | bc6694d4 | Kevin Wolf | } |
301 | bc6694d4 | Kevin Wolf | |
302 | bc6694d4 | Kevin Wolf | req->out = (void *)req->elem.out_sg[0].iov_base; |
303 | bc6694d4 | Kevin Wolf | req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base; |
304 | bc6694d4 | Kevin Wolf | |
305 | bc6694d4 | Kevin Wolf | if (req->out->type & VIRTIO_BLK_T_FLUSH) {
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306 | bc6694d4 | Kevin Wolf | virtio_blk_handle_flush(req); |
307 | bc6694d4 | Kevin Wolf | } else if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) { |
308 | bc6694d4 | Kevin Wolf | virtio_blk_handle_scsi(req); |
309 | bc6694d4 | Kevin Wolf | } else if (req->out->type & VIRTIO_BLK_T_OUT) { |
310 | bc6694d4 | Kevin Wolf | qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
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311 | bc6694d4 | Kevin Wolf | req->elem.out_num - 1);
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312 | bc6694d4 | Kevin Wolf | virtio_blk_handle_write(mrb->blkreq, &mrb->num_writes, |
313 | bc6694d4 | Kevin Wolf | req, &mrb->old_bs); |
314 | bc6694d4 | Kevin Wolf | } else {
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315 | bc6694d4 | Kevin Wolf | qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
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316 | bc6694d4 | Kevin Wolf | req->elem.in_num - 1);
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317 | bc6694d4 | Kevin Wolf | virtio_blk_handle_read(req); |
318 | bc6694d4 | Kevin Wolf | } |
319 | bc6694d4 | Kevin Wolf | } |
320 | bc6694d4 | Kevin Wolf | |
321 | 6e02c38d | aliguori | static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
322 | 6e02c38d | aliguori | { |
323 | 6e02c38d | aliguori | VirtIOBlock *s = to_virtio_blk(vdev); |
324 | 6e02c38d | aliguori | VirtIOBlockReq *req; |
325 | bc6694d4 | Kevin Wolf | MultiReqBuffer mrb = { |
326 | bc6694d4 | Kevin Wolf | .num_writes = 0,
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327 | bc6694d4 | Kevin Wolf | .old_bs = NULL,
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328 | bc6694d4 | Kevin Wolf | }; |
329 | 6e02c38d | aliguori | |
330 | 6e02c38d | aliguori | while ((req = virtio_blk_get_request(s))) {
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331 | bc6694d4 | Kevin Wolf | virtio_blk_handle_request(req, &mrb); |
332 | 6e02c38d | aliguori | } |
333 | 91553dcc | Kevin Wolf | |
334 | bc6694d4 | Kevin Wolf | if (mrb.num_writes > 0) { |
335 | bc6694d4 | Kevin Wolf | do_multiwrite(mrb.old_bs, mrb.blkreq, mrb.num_writes); |
336 | 91553dcc | Kevin Wolf | } |
337 | 91553dcc | Kevin Wolf | |
338 | 6e02c38d | aliguori | /*
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339 | 6e02c38d | aliguori | * FIXME: Want to check for completions before returning to guest mode,
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340 | 6e02c38d | aliguori | * so cached reads and writes are reported as quickly as possible. But
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341 | 6e02c38d | aliguori | * that should be done in the generic block layer.
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342 | 6e02c38d | aliguori | */
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343 | 6e02c38d | aliguori | } |
344 | 6e02c38d | aliguori | |
345 | 213189ab | Markus Armbruster | static void virtio_blk_dma_restart_bh(void *opaque) |
346 | 869a5c6d | aliguori | { |
347 | 869a5c6d | aliguori | VirtIOBlock *s = opaque; |
348 | 869a5c6d | aliguori | VirtIOBlockReq *req = s->rq; |
349 | f1b52868 | Kevin Wolf | MultiReqBuffer mrb = { |
350 | f1b52868 | Kevin Wolf | .num_writes = 0,
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351 | f1b52868 | Kevin Wolf | .old_bs = NULL,
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352 | f1b52868 | Kevin Wolf | }; |
353 | 869a5c6d | aliguori | |
354 | 213189ab | Markus Armbruster | qemu_bh_delete(s->bh); |
355 | 213189ab | Markus Armbruster | s->bh = NULL;
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356 | 869a5c6d | aliguori | |
357 | 869a5c6d | aliguori | s->rq = NULL;
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358 | 869a5c6d | aliguori | |
359 | 869a5c6d | aliguori | while (req) {
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360 | f1b52868 | Kevin Wolf | virtio_blk_handle_request(req, &mrb); |
361 | 869a5c6d | aliguori | req = req->next; |
362 | 869a5c6d | aliguori | } |
363 | f1b52868 | Kevin Wolf | |
364 | f1b52868 | Kevin Wolf | if (mrb.num_writes > 0) { |
365 | f1b52868 | Kevin Wolf | do_multiwrite(mrb.old_bs, mrb.blkreq, mrb.num_writes); |
366 | f1b52868 | Kevin Wolf | } |
367 | 869a5c6d | aliguori | } |
368 | 869a5c6d | aliguori | |
369 | 213189ab | Markus Armbruster | static void virtio_blk_dma_restart_cb(void *opaque, int running, int reason) |
370 | 213189ab | Markus Armbruster | { |
371 | 213189ab | Markus Armbruster | VirtIOBlock *s = opaque; |
372 | 213189ab | Markus Armbruster | |
373 | 213189ab | Markus Armbruster | if (!running)
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374 | 213189ab | Markus Armbruster | return;
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375 | 213189ab | Markus Armbruster | |
376 | 213189ab | Markus Armbruster | if (!s->bh) {
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377 | 213189ab | Markus Armbruster | s->bh = qemu_bh_new(virtio_blk_dma_restart_bh, s); |
378 | 213189ab | Markus Armbruster | qemu_bh_schedule(s->bh); |
379 | 213189ab | Markus Armbruster | } |
380 | 213189ab | Markus Armbruster | } |
381 | 213189ab | Markus Armbruster | |
382 | 6e02c38d | aliguori | static void virtio_blk_reset(VirtIODevice *vdev) |
383 | 6e02c38d | aliguori | { |
384 | 6e02c38d | aliguori | /*
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385 | 6e02c38d | aliguori | * This should cancel pending requests, but can't do nicely until there
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386 | 6e02c38d | aliguori | * are per-device request lists.
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387 | 6e02c38d | aliguori | */
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388 | 6e02c38d | aliguori | qemu_aio_flush(); |
389 | 6e02c38d | aliguori | } |
390 | 6e02c38d | aliguori | |
391 | bf011293 | john cooper | /* coalesce internal state, copy to pci i/o region 0
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392 | bf011293 | john cooper | */
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393 | 6e02c38d | aliguori | static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) |
394 | 6e02c38d | aliguori | { |
395 | 6e02c38d | aliguori | VirtIOBlock *s = to_virtio_blk(vdev); |
396 | 6e02c38d | aliguori | struct virtio_blk_config blkcfg;
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397 | 6e02c38d | aliguori | uint64_t capacity; |
398 | 6e02c38d | aliguori | int cylinders, heads, secs;
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399 | 6e02c38d | aliguori | |
400 | 6e02c38d | aliguori | bdrv_get_geometry(s->bs, &capacity); |
401 | 6e02c38d | aliguori | bdrv_get_geometry_hint(s->bs, &cylinders, &heads, &secs); |
402 | 5c5dafdc | Gerd Hoffmann | memset(&blkcfg, 0, sizeof(blkcfg)); |
403 | 6e02c38d | aliguori | stq_raw(&blkcfg.capacity, capacity); |
404 | 6e02c38d | aliguori | stl_raw(&blkcfg.seg_max, 128 - 2); |
405 | 6e02c38d | aliguori | stw_raw(&blkcfg.cylinders, cylinders); |
406 | 6e02c38d | aliguori | blkcfg.heads = heads; |
407 | 6e02c38d | aliguori | blkcfg.sectors = secs; |
408 | c7085da7 | Blue Swirl | blkcfg.size_max = 0;
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409 | 9752c371 | Christoph Hellwig | blkcfg.physical_block_exp = get_physical_block_exp(s->conf); |
410 | 9752c371 | Christoph Hellwig | blkcfg.alignment_offset = 0;
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411 | 9752c371 | Christoph Hellwig | blkcfg.min_io_size = s->conf->min_io_size / 512;
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412 | 9752c371 | Christoph Hellwig | blkcfg.opt_io_size = s->conf->opt_io_size / 512;
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413 | 37d5ddd6 | hch@lst.de | memcpy(config, &blkcfg, sizeof(struct virtio_blk_config)); |
414 | 6e02c38d | aliguori | } |
415 | 6e02c38d | aliguori | |
416 | 8172539d | Michael S. Tsirkin | static uint32_t virtio_blk_get_features(VirtIODevice *vdev, uint32_t features)
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417 | 6e02c38d | aliguori | { |
418 | bf011293 | john cooper | VirtIOBlock *s = to_virtio_blk(vdev); |
419 | 1063b8b1 | Christoph Hellwig | |
420 | 1063b8b1 | Christoph Hellwig | features |= (1 << VIRTIO_BLK_F_SEG_MAX);
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421 | 1063b8b1 | Christoph Hellwig | features |= (1 << VIRTIO_BLK_F_GEOMETRY);
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422 | 9752c371 | Christoph Hellwig | features |= (1 << VIRTIO_BLK_F_TOPOLOGY);
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423 | aa659be3 | Christoph Hellwig | |
424 | aa659be3 | Christoph Hellwig | if (bdrv_enable_write_cache(s->bs))
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425 | aa659be3 | Christoph Hellwig | features |= (1 << VIRTIO_BLK_F_WCACHE);
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426 | c79662f7 | Naphtali Sprei | |
427 | c79662f7 | Naphtali Sprei | if (bdrv_is_read_only(s->bs))
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428 | c79662f7 | Naphtali Sprei | features |= 1 << VIRTIO_BLK_F_RO;
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429 | 1063b8b1 | Christoph Hellwig | |
430 | 1063b8b1 | Christoph Hellwig | return features;
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431 | 6e02c38d | aliguori | } |
432 | 6e02c38d | aliguori | |
433 | 6e02c38d | aliguori | static void virtio_blk_save(QEMUFile *f, void *opaque) |
434 | 6e02c38d | aliguori | { |
435 | 6e02c38d | aliguori | VirtIOBlock *s = opaque; |
436 | 869a5c6d | aliguori | VirtIOBlockReq *req = s->rq; |
437 | 869a5c6d | aliguori | |
438 | 6e02c38d | aliguori | virtio_save(&s->vdev, f); |
439 | 869a5c6d | aliguori | |
440 | 869a5c6d | aliguori | while (req) {
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441 | 869a5c6d | aliguori | qemu_put_sbyte(f, 1);
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442 | 869a5c6d | aliguori | qemu_put_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); |
443 | 869a5c6d | aliguori | req = req->next; |
444 | 869a5c6d | aliguori | } |
445 | 869a5c6d | aliguori | qemu_put_sbyte(f, 0);
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446 | 6e02c38d | aliguori | } |
447 | 6e02c38d | aliguori | |
448 | 6e02c38d | aliguori | static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id) |
449 | 6e02c38d | aliguori | { |
450 | 6e02c38d | aliguori | VirtIOBlock *s = opaque; |
451 | 6e02c38d | aliguori | |
452 | 869a5c6d | aliguori | if (version_id != 2) |
453 | 6e02c38d | aliguori | return -EINVAL;
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454 | 6e02c38d | aliguori | |
455 | 6e02c38d | aliguori | virtio_load(&s->vdev, f); |
456 | 869a5c6d | aliguori | while (qemu_get_sbyte(f)) {
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457 | 869a5c6d | aliguori | VirtIOBlockReq *req = virtio_blk_alloc_request(s); |
458 | 869a5c6d | aliguori | qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); |
459 | 869a5c6d | aliguori | req->next = s->rq; |
460 | 869a5c6d | aliguori | s->rq = req->next; |
461 | 869a5c6d | aliguori | } |
462 | 6e02c38d | aliguori | |
463 | 6e02c38d | aliguori | return 0; |
464 | 6e02c38d | aliguori | } |
465 | 6e02c38d | aliguori | |
466 | 428c149b | Christoph Hellwig | VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf) |
467 | 6e02c38d | aliguori | { |
468 | 6e02c38d | aliguori | VirtIOBlock *s; |
469 | 6e02c38d | aliguori | int cylinders, heads, secs;
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470 | 6e02c38d | aliguori | static int virtio_blk_id; |
471 | cf21e106 | Paul Brook | |
472 | 53c25cea | Paul Brook | s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
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473 | 37d5ddd6 | hch@lst.de | sizeof(struct virtio_blk_config), |
474 | 53c25cea | Paul Brook | sizeof(VirtIOBlock));
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475 | 6e02c38d | aliguori | |
476 | 6e02c38d | aliguori | s->vdev.get_config = virtio_blk_update_config; |
477 | 6e02c38d | aliguori | s->vdev.get_features = virtio_blk_get_features; |
478 | 6e02c38d | aliguori | s->vdev.reset = virtio_blk_reset; |
479 | 428c149b | Christoph Hellwig | s->bs = conf->dinfo->bdrv; |
480 | 9752c371 | Christoph Hellwig | s->conf = conf; |
481 | 869a5c6d | aliguori | s->rq = NULL;
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482 | 6e02c38d | aliguori | bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs); |
483 | 6e02c38d | aliguori | bdrv_set_geometry_hint(s->bs, cylinders, heads, secs); |
484 | 6e02c38d | aliguori | |
485 | 6e02c38d | aliguori | s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output);
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486 | 6e02c38d | aliguori | |
487 | 869a5c6d | aliguori | qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); |
488 | 869a5c6d | aliguori | register_savevm("virtio-blk", virtio_blk_id++, 2, |
489 | 6e02c38d | aliguori | virtio_blk_save, virtio_blk_load, s); |
490 | 6e02c38d | aliguori | |
491 | 53c25cea | Paul Brook | return &s->vdev;
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492 | 6e02c38d | aliguori | } |