16e790746SPaolo Bonzini /* 26e790746SPaolo Bonzini * Virtio Block Device 36e790746SPaolo Bonzini * 46e790746SPaolo Bonzini * Copyright IBM, Corp. 2007 56e790746SPaolo Bonzini * 66e790746SPaolo Bonzini * Authors: 76e790746SPaolo Bonzini * Anthony Liguori <aliguori@us.ibm.com> 86e790746SPaolo Bonzini * 96e790746SPaolo Bonzini * This work is licensed under the terms of the GNU GPL, version 2. See 106e790746SPaolo Bonzini * the COPYING file in the top-level directory. 116e790746SPaolo Bonzini * 126e790746SPaolo Bonzini */ 136e790746SPaolo Bonzini 1480c71a24SPeter Maydell #include "qemu/osdep.h" 15da34e65cSMarkus Armbruster #include "qapi/error.h" 166e790746SPaolo Bonzini #include "qemu-common.h" 17827805a2SFam Zheng #include "qemu/iov.h" 186e790746SPaolo Bonzini #include "qemu/error-report.h" 196e790746SPaolo Bonzini #include "trace.h" 206e790746SPaolo Bonzini #include "hw/block/block.h" 214be74634SMarkus Armbruster #include "sysemu/block-backend.h" 226e790746SPaolo Bonzini #include "sysemu/blockdev.h" 236e790746SPaolo Bonzini #include "hw/virtio/virtio-blk.h" 246e790746SPaolo Bonzini #include "dataplane/virtio-blk.h" 2508e2c9f1SPaolo Bonzini #include "scsi/constants.h" 266e790746SPaolo Bonzini #ifdef __linux__ 276e790746SPaolo Bonzini # include <scsi/sg.h> 286e790746SPaolo Bonzini #endif 296e790746SPaolo Bonzini #include "hw/virtio/virtio-bus.h" 30783d1897SRusty Russell #include "hw/virtio/virtio-access.h" 316e790746SPaolo Bonzini 32d14dde5eSGreg Kurz static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq, 33edaffd9fSStefan Hajnoczi VirtIOBlockReq *req) 34671ec3f0SFam Zheng { 35671ec3f0SFam Zheng req->dev = s; 36edaffd9fSStefan Hajnoczi req->vq = vq; 37869d66afSStefan Hajnoczi req->qiov.size = 0; 382a6cdd6dSPaolo Bonzini req->in_len = 0; 39869d66afSStefan Hajnoczi req->next = NULL; 4095f7142aSPeter Lieven req->mr_next = NULL; 41671ec3f0SFam Zheng } 42671ec3f0SFam Zheng 43d14dde5eSGreg Kurz static void virtio_blk_free_request(VirtIOBlockReq *req) 44671ec3f0SFam Zheng { 45c84b3192SPaolo Bonzini g_free(req); 46671ec3f0SFam Zheng } 47671ec3f0SFam Zheng 4803de2f52SPaolo Bonzini static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status) 496e790746SPaolo Bonzini { 506e790746SPaolo Bonzini VirtIOBlock *s = req->dev; 516e790746SPaolo Bonzini VirtIODevice *vdev = VIRTIO_DEVICE(s); 526e790746SPaolo Bonzini 53a576ceacSStefan Hajnoczi trace_virtio_blk_req_complete(vdev, req, status); 546e790746SPaolo Bonzini 556e790746SPaolo Bonzini stb_p(&req->in->status, status); 56edaffd9fSStefan Hajnoczi virtqueue_push(req->vq, &req->elem, req->in_len); 57eb41cf78SPaolo Bonzini if (s->dataplane_started && !s->dataplane_disabled) { 58edaffd9fSStefan Hajnoczi virtio_blk_data_plane_notify(s->dataplane, req->vq); 5903de2f52SPaolo Bonzini } else { 60edaffd9fSStefan Hajnoczi virtio_notify(vdev, req->vq); 616e790746SPaolo Bonzini } 62bf4bd461SFam Zheng } 63bf4bd461SFam Zheng 646e790746SPaolo Bonzini static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, 656e790746SPaolo Bonzini bool is_read) 666e790746SPaolo Bonzini { 674be74634SMarkus Armbruster BlockErrorAction action = blk_get_error_action(req->dev->blk, 684be74634SMarkus Armbruster is_read, error); 696e790746SPaolo Bonzini VirtIOBlock *s = req->dev; 706e790746SPaolo Bonzini 71a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_STOP) { 72466138dcSFam Zheng /* Break the link as the next request is going to be parsed from the 73466138dcSFam Zheng * ring again. Otherwise we may end up doing a double completion! */ 74466138dcSFam Zheng req->mr_next = NULL; 756e790746SPaolo Bonzini req->next = s->rq; 766e790746SPaolo Bonzini s->rq = req; 77a589569fSWenchao Xia } else if (action == BLOCK_ERROR_ACTION_REPORT) { 786e790746SPaolo Bonzini virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); 7901762e03SAlberto Garcia block_acct_failed(blk_get_stats(s->blk), &req->acct); 80671ec3f0SFam Zheng virtio_blk_free_request(req); 816e790746SPaolo Bonzini } 826e790746SPaolo Bonzini 834be74634SMarkus Armbruster blk_error_action(s->blk, action, is_read, error); 84a589569fSWenchao Xia return action != BLOCK_ERROR_ACTION_IGNORE; 856e790746SPaolo Bonzini } 866e790746SPaolo Bonzini 876e790746SPaolo Bonzini static void virtio_blk_rw_complete(void *opaque, int ret) 886e790746SPaolo Bonzini { 8995f7142aSPeter Lieven VirtIOBlockReq *next = opaque; 90b9e413ddSPaolo Bonzini VirtIOBlock *s = next->dev; 91a576ceacSStefan Hajnoczi VirtIODevice *vdev = VIRTIO_DEVICE(s); 926e790746SPaolo Bonzini 93b9e413ddSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); 9495f7142aSPeter Lieven while (next) { 9595f7142aSPeter Lieven VirtIOBlockReq *req = next; 9695f7142aSPeter Lieven next = req->mr_next; 97a576ceacSStefan Hajnoczi trace_virtio_blk_rw_complete(vdev, req, ret); 986e790746SPaolo Bonzini 9995f7142aSPeter Lieven if (req->qiov.nalloc != -1) { 10095f7142aSPeter Lieven /* If nalloc is != 1 req->qiov is a local copy of the original 10195f7142aSPeter Lieven * external iovec. It was allocated in submit_merged_requests 10295f7142aSPeter Lieven * to be able to merge requests. */ 10395f7142aSPeter Lieven qemu_iovec_destroy(&req->qiov); 10495f7142aSPeter Lieven } 10595f7142aSPeter Lieven 1066e790746SPaolo Bonzini if (ret) { 107783d1897SRusty Russell int p = virtio_ldl_p(VIRTIO_DEVICE(req->dev), &req->out.type); 108783d1897SRusty Russell bool is_read = !(p & VIRTIO_BLK_T_OUT); 1092a6cdd6dSPaolo Bonzini /* Note that memory may be dirtied on read failure. If the 1102a6cdd6dSPaolo Bonzini * virtio request is not completed here, as is the case for 1112a6cdd6dSPaolo Bonzini * BLOCK_ERROR_ACTION_STOP, the memory may not be copied 1122a6cdd6dSPaolo Bonzini * correctly during live migration. While this is ugly, 1132a6cdd6dSPaolo Bonzini * it is acceptable because the device is free to write to 1142a6cdd6dSPaolo Bonzini * the memory until the request is completed (which will 1152a6cdd6dSPaolo Bonzini * happen on the other side of the migration). 1162a6cdd6dSPaolo Bonzini */ 11795f7142aSPeter Lieven if (virtio_blk_handle_rw_error(req, -ret, is_read)) { 11895f7142aSPeter Lieven continue; 11995f7142aSPeter Lieven } 1206e790746SPaolo Bonzini } 1216e790746SPaolo Bonzini 1226e790746SPaolo Bonzini virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 1234be74634SMarkus Armbruster block_acct_done(blk_get_stats(req->dev->blk), &req->acct); 124671ec3f0SFam Zheng virtio_blk_free_request(req); 1256e790746SPaolo Bonzini } 126b9e413ddSPaolo Bonzini aio_context_release(blk_get_aio_context(s->conf.conf.blk)); 12795f7142aSPeter Lieven } 1286e790746SPaolo Bonzini 1296e790746SPaolo Bonzini static void virtio_blk_flush_complete(void *opaque, int ret) 1306e790746SPaolo Bonzini { 1316e790746SPaolo Bonzini VirtIOBlockReq *req = opaque; 132b9e413ddSPaolo Bonzini VirtIOBlock *s = req->dev; 1336e790746SPaolo Bonzini 134b9e413ddSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); 1356e790746SPaolo Bonzini if (ret) { 1366e790746SPaolo Bonzini if (virtio_blk_handle_rw_error(req, -ret, 0)) { 137b9e413ddSPaolo Bonzini goto out; 1386e790746SPaolo Bonzini } 1396e790746SPaolo Bonzini } 1406e790746SPaolo Bonzini 1416e790746SPaolo Bonzini virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 1424be74634SMarkus Armbruster block_acct_done(blk_get_stats(req->dev->blk), &req->acct); 143671ec3f0SFam Zheng virtio_blk_free_request(req); 144b9e413ddSPaolo Bonzini 145b9e413ddSPaolo Bonzini out: 146b9e413ddSPaolo Bonzini aio_context_release(blk_get_aio_context(s->conf.conf.blk)); 1476e790746SPaolo Bonzini } 1486e790746SPaolo Bonzini 1491dc936aaSFam Zheng #ifdef __linux__ 1501dc936aaSFam Zheng 1511dc936aaSFam Zheng typedef struct { 1521dc936aaSFam Zheng VirtIOBlockReq *req; 1531dc936aaSFam Zheng struct sg_io_hdr hdr; 1541dc936aaSFam Zheng } VirtIOBlockIoctlReq; 1551dc936aaSFam Zheng 1561dc936aaSFam Zheng static void virtio_blk_ioctl_complete(void *opaque, int status) 1571dc936aaSFam Zheng { 1581dc936aaSFam Zheng VirtIOBlockIoctlReq *ioctl_req = opaque; 1591dc936aaSFam Zheng VirtIOBlockReq *req = ioctl_req->req; 1609d456654SPaolo Bonzini VirtIOBlock *s = req->dev; 1619d456654SPaolo Bonzini VirtIODevice *vdev = VIRTIO_DEVICE(s); 1621dc936aaSFam Zheng struct virtio_scsi_inhdr *scsi; 1631dc936aaSFam Zheng struct sg_io_hdr *hdr; 1641dc936aaSFam Zheng 1651dc936aaSFam Zheng scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base; 1661dc936aaSFam Zheng 1671dc936aaSFam Zheng if (status) { 1681dc936aaSFam Zheng status = VIRTIO_BLK_S_UNSUPP; 1691dc936aaSFam Zheng virtio_stl_p(vdev, &scsi->errors, 255); 1701dc936aaSFam Zheng goto out; 1711dc936aaSFam Zheng } 1721dc936aaSFam Zheng 1731dc936aaSFam Zheng hdr = &ioctl_req->hdr; 1741dc936aaSFam Zheng /* 1751dc936aaSFam Zheng * From SCSI-Generic-HOWTO: "Some lower level drivers (e.g. ide-scsi) 1761dc936aaSFam Zheng * clear the masked_status field [hence status gets cleared too, see 1771dc936aaSFam Zheng * block/scsi_ioctl.c] even when a CHECK_CONDITION or COMMAND_TERMINATED 1781dc936aaSFam Zheng * status has occurred. However they do set DRIVER_SENSE in driver_status 1791dc936aaSFam Zheng * field. Also a (sb_len_wr > 0) indicates there is a sense buffer. 1801dc936aaSFam Zheng */ 1811dc936aaSFam Zheng if (hdr->status == 0 && hdr->sb_len_wr > 0) { 1821dc936aaSFam Zheng hdr->status = CHECK_CONDITION; 1831dc936aaSFam Zheng } 1841dc936aaSFam Zheng 1851dc936aaSFam Zheng virtio_stl_p(vdev, &scsi->errors, 1861dc936aaSFam Zheng hdr->status | (hdr->msg_status << 8) | 1871dc936aaSFam Zheng (hdr->host_status << 16) | (hdr->driver_status << 24)); 1881dc936aaSFam Zheng virtio_stl_p(vdev, &scsi->residual, hdr->resid); 1891dc936aaSFam Zheng virtio_stl_p(vdev, &scsi->sense_len, hdr->sb_len_wr); 1901dc936aaSFam Zheng virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len); 1911dc936aaSFam Zheng 1921dc936aaSFam Zheng out: 193b9e413ddSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); 1941dc936aaSFam Zheng virtio_blk_req_complete(req, status); 1951dc936aaSFam Zheng virtio_blk_free_request(req); 196b9e413ddSPaolo Bonzini aio_context_release(blk_get_aio_context(s->conf.conf.blk)); 1971dc936aaSFam Zheng g_free(ioctl_req); 1981dc936aaSFam Zheng } 1991dc936aaSFam Zheng 2001dc936aaSFam Zheng #endif 2011dc936aaSFam Zheng 202edaffd9fSStefan Hajnoczi static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq) 2036e790746SPaolo Bonzini { 204edaffd9fSStefan Hajnoczi VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq)); 2056e790746SPaolo Bonzini 20651b19ebeSPaolo Bonzini if (req) { 207edaffd9fSStefan Hajnoczi virtio_blk_init_request(s, vq, req); 2086e790746SPaolo Bonzini } 2096e790746SPaolo Bonzini return req; 2106e790746SPaolo Bonzini } 2116e790746SPaolo Bonzini 21275344fa4SFam Zheng static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req) 2136e790746SPaolo Bonzini { 2146e790746SPaolo Bonzini int status = VIRTIO_BLK_S_OK; 2155a05cbeeSFam Zheng struct virtio_scsi_inhdr *scsi = NULL; 21675344fa4SFam Zheng VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 21775344fa4SFam Zheng VirtQueueElement *elem = &req->elem; 21875344fa4SFam Zheng VirtIOBlock *blk = req->dev; 219783d1897SRusty Russell 2205a05cbeeSFam Zheng #ifdef __linux__ 2215a05cbeeSFam Zheng int i; 2221dc936aaSFam Zheng VirtIOBlockIoctlReq *ioctl_req; 223a209f461SFam Zheng BlockAIOCB *acb; 2245a05cbeeSFam Zheng #endif 2256e790746SPaolo Bonzini 2266e790746SPaolo Bonzini /* 2276e790746SPaolo Bonzini * We require at least one output segment each for the virtio_blk_outhdr 2286e790746SPaolo Bonzini * and the SCSI command block. 2296e790746SPaolo Bonzini * 2306e790746SPaolo Bonzini * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr 2316e790746SPaolo Bonzini * and the sense buffer pointer in the input segments. 2326e790746SPaolo Bonzini */ 2335a05cbeeSFam Zheng if (elem->out_num < 2 || elem->in_num < 3) { 2345a05cbeeSFam Zheng status = VIRTIO_BLK_S_IOERR; 2355a05cbeeSFam Zheng goto fail; 2366e790746SPaolo Bonzini } 2376e790746SPaolo Bonzini 2386e790746SPaolo Bonzini /* 2396e790746SPaolo Bonzini * The scsi inhdr is placed in the second-to-last input segment, just 2406e790746SPaolo Bonzini * before the regular inhdr. 2416e790746SPaolo Bonzini */ 2425a05cbeeSFam Zheng scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base; 2436e790746SPaolo Bonzini 2442a30307fSMarkus Armbruster if (!blk->conf.scsi) { 2456e790746SPaolo Bonzini status = VIRTIO_BLK_S_UNSUPP; 2466e790746SPaolo Bonzini goto fail; 2476e790746SPaolo Bonzini } 2486e790746SPaolo Bonzini 2496e790746SPaolo Bonzini /* 2506e790746SPaolo Bonzini * No support for bidirection commands yet. 2516e790746SPaolo Bonzini */ 2525a05cbeeSFam Zheng if (elem->out_num > 2 && elem->in_num > 3) { 2536e790746SPaolo Bonzini status = VIRTIO_BLK_S_UNSUPP; 2546e790746SPaolo Bonzini goto fail; 2556e790746SPaolo Bonzini } 2566e790746SPaolo Bonzini 2576e790746SPaolo Bonzini #ifdef __linux__ 2581dc936aaSFam Zheng ioctl_req = g_new0(VirtIOBlockIoctlReq, 1); 2591dc936aaSFam Zheng ioctl_req->req = req; 2601dc936aaSFam Zheng ioctl_req->hdr.interface_id = 'S'; 2611dc936aaSFam Zheng ioctl_req->hdr.cmd_len = elem->out_sg[1].iov_len; 2621dc936aaSFam Zheng ioctl_req->hdr.cmdp = elem->out_sg[1].iov_base; 2631dc936aaSFam Zheng ioctl_req->hdr.dxfer_len = 0; 2646e790746SPaolo Bonzini 2655a05cbeeSFam Zheng if (elem->out_num > 2) { 2666e790746SPaolo Bonzini /* 2676e790746SPaolo Bonzini * If there are more than the minimally required 2 output segments 2686e790746SPaolo Bonzini * there is write payload starting from the third iovec. 2696e790746SPaolo Bonzini */ 2701dc936aaSFam Zheng ioctl_req->hdr.dxfer_direction = SG_DXFER_TO_DEV; 2711dc936aaSFam Zheng ioctl_req->hdr.iovec_count = elem->out_num - 2; 2726e790746SPaolo Bonzini 2731dc936aaSFam Zheng for (i = 0; i < ioctl_req->hdr.iovec_count; i++) { 2741dc936aaSFam Zheng ioctl_req->hdr.dxfer_len += elem->out_sg[i + 2].iov_len; 2751dc936aaSFam Zheng } 2766e790746SPaolo Bonzini 2771dc936aaSFam Zheng ioctl_req->hdr.dxferp = elem->out_sg + 2; 2786e790746SPaolo Bonzini 2795a05cbeeSFam Zheng } else if (elem->in_num > 3) { 2806e790746SPaolo Bonzini /* 2816e790746SPaolo Bonzini * If we have more than 3 input segments the guest wants to actually 2826e790746SPaolo Bonzini * read data. 2836e790746SPaolo Bonzini */ 2841dc936aaSFam Zheng ioctl_req->hdr.dxfer_direction = SG_DXFER_FROM_DEV; 2851dc936aaSFam Zheng ioctl_req->hdr.iovec_count = elem->in_num - 3; 2861dc936aaSFam Zheng for (i = 0; i < ioctl_req->hdr.iovec_count; i++) { 2871dc936aaSFam Zheng ioctl_req->hdr.dxfer_len += elem->in_sg[i].iov_len; 2881dc936aaSFam Zheng } 2896e790746SPaolo Bonzini 2901dc936aaSFam Zheng ioctl_req->hdr.dxferp = elem->in_sg; 2916e790746SPaolo Bonzini } else { 2926e790746SPaolo Bonzini /* 2936e790746SPaolo Bonzini * Some SCSI commands don't actually transfer any data. 2946e790746SPaolo Bonzini */ 2951dc936aaSFam Zheng ioctl_req->hdr.dxfer_direction = SG_DXFER_NONE; 2966e790746SPaolo Bonzini } 2976e790746SPaolo Bonzini 2981dc936aaSFam Zheng ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base; 2991dc936aaSFam Zheng ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len; 3006e790746SPaolo Bonzini 301a209f461SFam Zheng acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr, 3021dc936aaSFam Zheng virtio_blk_ioctl_complete, ioctl_req); 303a209f461SFam Zheng if (!acb) { 304a209f461SFam Zheng g_free(ioctl_req); 305a209f461SFam Zheng status = VIRTIO_BLK_S_UNSUPP; 306a209f461SFam Zheng goto fail; 307a209f461SFam Zheng } 3081dc936aaSFam Zheng return -EINPROGRESS; 3096e790746SPaolo Bonzini #else 3106e790746SPaolo Bonzini abort(); 3116e790746SPaolo Bonzini #endif 3126e790746SPaolo Bonzini 3136e790746SPaolo Bonzini fail: 3146e790746SPaolo Bonzini /* Just put anything nonzero so that the ioctl fails in the guest. */ 3155a05cbeeSFam Zheng if (scsi) { 316783d1897SRusty Russell virtio_stl_p(vdev, &scsi->errors, 255); 3175a05cbeeSFam Zheng } 3185a05cbeeSFam Zheng return status; 3195a05cbeeSFam Zheng } 3205a05cbeeSFam Zheng 3215a05cbeeSFam Zheng static void virtio_blk_handle_scsi(VirtIOBlockReq *req) 3225a05cbeeSFam Zheng { 3235a05cbeeSFam Zheng int status; 3245a05cbeeSFam Zheng 32575344fa4SFam Zheng status = virtio_blk_handle_scsi_req(req); 3261dc936aaSFam Zheng if (status != -EINPROGRESS) { 3276e790746SPaolo Bonzini virtio_blk_req_complete(req, status); 328671ec3f0SFam Zheng virtio_blk_free_request(req); 3296e790746SPaolo Bonzini } 3301dc936aaSFam Zheng } 3316e790746SPaolo Bonzini 33295f7142aSPeter Lieven static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb, 33395f7142aSPeter Lieven int start, int num_reqs, int niov) 3346e790746SPaolo Bonzini { 33595f7142aSPeter Lieven QEMUIOVector *qiov = &mrb->reqs[start]->qiov; 33695f7142aSPeter Lieven int64_t sector_num = mrb->reqs[start]->sector_num; 33795f7142aSPeter Lieven bool is_write = mrb->is_write; 3386e790746SPaolo Bonzini 33995f7142aSPeter Lieven if (num_reqs > 1) { 34095f7142aSPeter Lieven int i; 34195f7142aSPeter Lieven struct iovec *tmp_iov = qiov->iov; 34295f7142aSPeter Lieven int tmp_niov = qiov->niov; 34395f7142aSPeter Lieven 34495f7142aSPeter Lieven /* mrb->reqs[start]->qiov was initialized from external so we can't 345b5772fddSEric Blake * modify it here. We need to initialize it locally and then add the 34695f7142aSPeter Lieven * external iovecs. */ 34795f7142aSPeter Lieven qemu_iovec_init(qiov, niov); 34895f7142aSPeter Lieven 34995f7142aSPeter Lieven for (i = 0; i < tmp_niov; i++) { 35095f7142aSPeter Lieven qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len); 35195f7142aSPeter Lieven } 35295f7142aSPeter Lieven 35395f7142aSPeter Lieven for (i = start + 1; i < start + num_reqs; i++) { 35495f7142aSPeter Lieven qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0, 35595f7142aSPeter Lieven mrb->reqs[i]->qiov.size); 35695f7142aSPeter Lieven mrb->reqs[i - 1]->mr_next = mrb->reqs[i]; 35795f7142aSPeter Lieven } 35895f7142aSPeter Lieven 359a576ceacSStefan Hajnoczi trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb->reqs[start]->dev), 360a576ceacSStefan Hajnoczi mrb, start, num_reqs, 361b5772fddSEric Blake sector_num << BDRV_SECTOR_BITS, 362b5772fddSEric Blake qiov->size, is_write); 36395f7142aSPeter Lieven block_acct_merge_done(blk_get_stats(blk), 36495f7142aSPeter Lieven is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ, 36595f7142aSPeter Lieven num_reqs - 1); 36695f7142aSPeter Lieven } 36795f7142aSPeter Lieven 36895f7142aSPeter Lieven if (is_write) { 369b5772fddSEric Blake blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0, 37095f7142aSPeter Lieven virtio_blk_rw_complete, mrb->reqs[start]); 37195f7142aSPeter Lieven } else { 372b5772fddSEric Blake blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0, 37395f7142aSPeter Lieven virtio_blk_rw_complete, mrb->reqs[start]); 37495f7142aSPeter Lieven } 37595f7142aSPeter Lieven } 37695f7142aSPeter Lieven 37795f7142aSPeter Lieven static int multireq_compare(const void *a, const void *b) 37895f7142aSPeter Lieven { 37995f7142aSPeter Lieven const VirtIOBlockReq *req1 = *(VirtIOBlockReq **)a, 38095f7142aSPeter Lieven *req2 = *(VirtIOBlockReq **)b; 38195f7142aSPeter Lieven 38295f7142aSPeter Lieven /* 38395f7142aSPeter Lieven * Note that we can't simply subtract sector_num1 from sector_num2 38495f7142aSPeter Lieven * here as that could overflow the return value. 38595f7142aSPeter Lieven */ 38695f7142aSPeter Lieven if (req1->sector_num > req2->sector_num) { 38795f7142aSPeter Lieven return 1; 38895f7142aSPeter Lieven } else if (req1->sector_num < req2->sector_num) { 38995f7142aSPeter Lieven return -1; 39095f7142aSPeter Lieven } else { 39195f7142aSPeter Lieven return 0; 39295f7142aSPeter Lieven } 39395f7142aSPeter Lieven } 39495f7142aSPeter Lieven 395d14dde5eSGreg Kurz static void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb) 39695f7142aSPeter Lieven { 39795f7142aSPeter Lieven int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0; 3985def6b80SEric Blake uint32_t max_transfer; 39995f7142aSPeter Lieven int64_t sector_num = 0; 40095f7142aSPeter Lieven 40195f7142aSPeter Lieven if (mrb->num_reqs == 1) { 40295f7142aSPeter Lieven submit_requests(blk, mrb, 0, 1, -1); 40395f7142aSPeter Lieven mrb->num_reqs = 0; 4046e790746SPaolo Bonzini return; 4056e790746SPaolo Bonzini } 4066e790746SPaolo Bonzini 4075def6b80SEric Blake max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk); 40895f7142aSPeter Lieven 40995f7142aSPeter Lieven qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs), 41095f7142aSPeter Lieven &multireq_compare); 41195f7142aSPeter Lieven 41295f7142aSPeter Lieven for (i = 0; i < mrb->num_reqs; i++) { 41395f7142aSPeter Lieven VirtIOBlockReq *req = mrb->reqs[i]; 41495f7142aSPeter Lieven if (num_reqs > 0) { 41549cffbc6SGonglei /* 41649cffbc6SGonglei * NOTE: We cannot merge the requests in below situations: 41749cffbc6SGonglei * 1. requests are not sequential 41849cffbc6SGonglei * 2. merge would exceed maximum number of IOVs 41949cffbc6SGonglei * 3. merge would exceed maximum transfer length of backend device 42049cffbc6SGonglei */ 42149cffbc6SGonglei if (sector_num + nb_sectors != req->sector_num || 422222565f6SStefan Hajnoczi niov > blk_get_max_iov(blk) - req->qiov.niov || 4235def6b80SEric Blake req->qiov.size > max_transfer || 4245def6b80SEric Blake nb_sectors > (max_transfer - 4255def6b80SEric Blake req->qiov.size) / BDRV_SECTOR_SIZE) { 42695f7142aSPeter Lieven submit_requests(blk, mrb, start, num_reqs, niov); 42795f7142aSPeter Lieven num_reqs = 0; 4286e790746SPaolo Bonzini } 4296e790746SPaolo Bonzini } 4306e790746SPaolo Bonzini 43195f7142aSPeter Lieven if (num_reqs == 0) { 43295f7142aSPeter Lieven sector_num = req->sector_num; 43395f7142aSPeter Lieven nb_sectors = niov = 0; 43495f7142aSPeter Lieven start = i; 43595f7142aSPeter Lieven } 43695f7142aSPeter Lieven 43795f7142aSPeter Lieven nb_sectors += req->qiov.size / BDRV_SECTOR_SIZE; 43895f7142aSPeter Lieven niov += req->qiov.niov; 43995f7142aSPeter Lieven num_reqs++; 44095f7142aSPeter Lieven } 44195f7142aSPeter Lieven 44295f7142aSPeter Lieven submit_requests(blk, mrb, start, num_reqs, niov); 44395f7142aSPeter Lieven mrb->num_reqs = 0; 4446e790746SPaolo Bonzini } 4456e790746SPaolo Bonzini 4466e790746SPaolo Bonzini static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb) 4476e790746SPaolo Bonzini { 4484be74634SMarkus Armbruster block_acct_start(blk_get_stats(req->dev->blk), &req->acct, 0, 4495366d0c8SBenoît Canet BLOCK_ACCT_FLUSH); 4506e790746SPaolo Bonzini 4516e790746SPaolo Bonzini /* 4526e790746SPaolo Bonzini * Make sure all outstanding writes are posted to the backing device. 4536e790746SPaolo Bonzini */ 45495f7142aSPeter Lieven if (mrb->is_write && mrb->num_reqs > 0) { 45595f7142aSPeter Lieven virtio_blk_submit_multireq(req->dev->blk, mrb); 45695f7142aSPeter Lieven } 4574be74634SMarkus Armbruster blk_aio_flush(req->dev->blk, virtio_blk_flush_complete, req); 4586e790746SPaolo Bonzini } 4596e790746SPaolo Bonzini 460d0e14376SMarkus Armbruster static bool virtio_blk_sect_range_ok(VirtIOBlock *dev, 461d0e14376SMarkus Armbruster uint64_t sector, size_t size) 462d0e14376SMarkus Armbruster { 4633c2daac0SMarkus Armbruster uint64_t nb_sectors = size >> BDRV_SECTOR_BITS; 4643c2daac0SMarkus Armbruster uint64_t total_sectors; 4653c2daac0SMarkus Armbruster 46675af1f34SPeter Lieven if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) { 46795f7142aSPeter Lieven return false; 46895f7142aSPeter Lieven } 469d0e14376SMarkus Armbruster if (sector & dev->sector_mask) { 470d0e14376SMarkus Armbruster return false; 471d0e14376SMarkus Armbruster } 4722a30307fSMarkus Armbruster if (size % dev->conf.conf.logical_block_size) { 473d0e14376SMarkus Armbruster return false; 474d0e14376SMarkus Armbruster } 4754be74634SMarkus Armbruster blk_get_geometry(dev->blk, &total_sectors); 4763c2daac0SMarkus Armbruster if (sector > total_sectors || nb_sectors > total_sectors - sector) { 4773c2daac0SMarkus Armbruster return false; 4783c2daac0SMarkus Armbruster } 479d0e14376SMarkus Armbruster return true; 480d0e14376SMarkus Armbruster } 481d0e14376SMarkus Armbruster 48220ea686aSGreg Kurz static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) 4836e790746SPaolo Bonzini { 4846e790746SPaolo Bonzini uint32_t type; 485f897bf75SStefan Hajnoczi struct iovec *in_iov = req->elem.in_sg; 486f897bf75SStefan Hajnoczi struct iovec *iov = req->elem.out_sg; 487f897bf75SStefan Hajnoczi unsigned in_num = req->elem.in_num; 488f897bf75SStefan Hajnoczi unsigned out_num = req->elem.out_num; 48920ea686aSGreg Kurz VirtIOBlock *s = req->dev; 49020ea686aSGreg Kurz VirtIODevice *vdev = VIRTIO_DEVICE(s); 4916e790746SPaolo Bonzini 492f897bf75SStefan Hajnoczi if (req->elem.out_num < 1 || req->elem.in_num < 1) { 49320ea686aSGreg Kurz virtio_error(vdev, "virtio-blk missing headers"); 49420ea686aSGreg Kurz return -1; 4956e790746SPaolo Bonzini } 4966e790746SPaolo Bonzini 497827805a2SFam Zheng if (unlikely(iov_to_buf(iov, out_num, 0, &req->out, 498827805a2SFam Zheng sizeof(req->out)) != sizeof(req->out))) { 49920ea686aSGreg Kurz virtio_error(vdev, "virtio-blk request outhdr too short"); 50020ea686aSGreg Kurz return -1; 501827805a2SFam Zheng } 502ee17e848SFam Zheng 503827805a2SFam Zheng iov_discard_front(&iov, &out_num, sizeof(req->out)); 504ee17e848SFam Zheng 50512048545SGonglei if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) { 50620ea686aSGreg Kurz virtio_error(vdev, "virtio-blk request inhdr too short"); 50720ea686aSGreg Kurz return -1; 508ee17e848SFam Zheng } 509ee17e848SFam Zheng 5102a6cdd6dSPaolo Bonzini /* We always touch the last byte, so just see how big in_iov is. */ 5112a6cdd6dSPaolo Bonzini req->in_len = iov_size(in_iov, in_num); 512ee17e848SFam Zheng req->in = (void *)in_iov[in_num - 1].iov_base 513ee17e848SFam Zheng + in_iov[in_num - 1].iov_len 514ee17e848SFam Zheng - sizeof(struct virtio_blk_inhdr); 515ee17e848SFam Zheng iov_discard_back(in_iov, &in_num, sizeof(struct virtio_blk_inhdr)); 5166e790746SPaolo Bonzini 517783d1897SRusty Russell type = virtio_ldl_p(VIRTIO_DEVICE(req->dev), &req->out.type); 5186e790746SPaolo Bonzini 51995f7142aSPeter Lieven /* VIRTIO_BLK_T_OUT defines the command direction. VIRTIO_BLK_T_BARRIER 520631b22eaSStefan Weil * is an optional flag. Although a guest should not send this flag if 52195f7142aSPeter Lieven * not negotiated we ignored it in the past. So keep ignoring it. */ 52295f7142aSPeter Lieven switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) { 52395f7142aSPeter Lieven case VIRTIO_BLK_T_IN: 52495f7142aSPeter Lieven { 52595f7142aSPeter Lieven bool is_write = type & VIRTIO_BLK_T_OUT; 52695f7142aSPeter Lieven req->sector_num = virtio_ldq_p(VIRTIO_DEVICE(req->dev), 52795f7142aSPeter Lieven &req->out.sector); 52895f7142aSPeter Lieven 52995f7142aSPeter Lieven if (is_write) { 53095f7142aSPeter Lieven qemu_iovec_init_external(&req->qiov, iov, out_num); 531a576ceacSStefan Hajnoczi trace_virtio_blk_handle_write(vdev, req, req->sector_num, 53295f7142aSPeter Lieven req->qiov.size / BDRV_SECTOR_SIZE); 53395f7142aSPeter Lieven } else { 53495f7142aSPeter Lieven qemu_iovec_init_external(&req->qiov, in_iov, in_num); 535a576ceacSStefan Hajnoczi trace_virtio_blk_handle_read(vdev, req, req->sector_num, 53695f7142aSPeter Lieven req->qiov.size / BDRV_SECTOR_SIZE); 53795f7142aSPeter Lieven } 53895f7142aSPeter Lieven 53995f7142aSPeter Lieven if (!virtio_blk_sect_range_ok(req->dev, req->sector_num, 54095f7142aSPeter Lieven req->qiov.size)) { 54195f7142aSPeter Lieven virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); 54201762e03SAlberto Garcia block_acct_invalid(blk_get_stats(req->dev->blk), 54301762e03SAlberto Garcia is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ); 54495f7142aSPeter Lieven virtio_blk_free_request(req); 54520ea686aSGreg Kurz return 0; 54695f7142aSPeter Lieven } 54795f7142aSPeter Lieven 54895f7142aSPeter Lieven block_acct_start(blk_get_stats(req->dev->blk), 54995f7142aSPeter Lieven &req->acct, req->qiov.size, 55095f7142aSPeter Lieven is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ); 55195f7142aSPeter Lieven 55295f7142aSPeter Lieven /* merge would exceed maximum number of requests or IO direction 55395f7142aSPeter Lieven * changes */ 55495f7142aSPeter Lieven if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS || 555c99495acSPeter Lieven is_write != mrb->is_write || 556c99495acSPeter Lieven !req->dev->conf.request_merging)) { 55795f7142aSPeter Lieven virtio_blk_submit_multireq(req->dev->blk, mrb); 55895f7142aSPeter Lieven } 55995f7142aSPeter Lieven 56095f7142aSPeter Lieven assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS); 56195f7142aSPeter Lieven mrb->reqs[mrb->num_reqs++] = req; 56295f7142aSPeter Lieven mrb->is_write = is_write; 56395f7142aSPeter Lieven break; 56495f7142aSPeter Lieven } 56595f7142aSPeter Lieven case VIRTIO_BLK_T_FLUSH: 5666e790746SPaolo Bonzini virtio_blk_handle_flush(req, mrb); 56795f7142aSPeter Lieven break; 56895f7142aSPeter Lieven case VIRTIO_BLK_T_SCSI_CMD: 5696e790746SPaolo Bonzini virtio_blk_handle_scsi(req); 57095f7142aSPeter Lieven break; 57195f7142aSPeter Lieven case VIRTIO_BLK_T_GET_ID: 57295f7142aSPeter Lieven { 5736e790746SPaolo Bonzini VirtIOBlock *s = req->dev; 5746e790746SPaolo Bonzini 5756e790746SPaolo Bonzini /* 5766e790746SPaolo Bonzini * NB: per existing s/n string convention the string is 5776e790746SPaolo Bonzini * terminated by '\0' only when shorter than buffer. 5786e790746SPaolo Bonzini */ 5792a30307fSMarkus Armbruster const char *serial = s->conf.serial ? s->conf.serial : ""; 580a83ceea8SMarc Marí size_t size = MIN(strlen(serial) + 1, 581a83ceea8SMarc Marí MIN(iov_size(in_iov, in_num), 582a83ceea8SMarc Marí VIRTIO_BLK_ID_BYTES)); 583a83ceea8SMarc Marí iov_from_buf(in_iov, in_num, 0, serial, size); 5846e790746SPaolo Bonzini virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 585671ec3f0SFam Zheng virtio_blk_free_request(req); 58695f7142aSPeter Lieven break; 58795f7142aSPeter Lieven } 58895f7142aSPeter Lieven default: 5896e790746SPaolo Bonzini virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); 590671ec3f0SFam Zheng virtio_blk_free_request(req); 5916e790746SPaolo Bonzini } 59220ea686aSGreg Kurz return 0; 5936e790746SPaolo Bonzini } 5946e790746SPaolo Bonzini 59507931698SFam Zheng bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq) 5966e790746SPaolo Bonzini { 5976e790746SPaolo Bonzini VirtIOBlockReq *req; 59895f7142aSPeter Lieven MultiReqBuffer mrb = {}; 59907931698SFam Zheng bool progress = false; 6006e790746SPaolo Bonzini 6019d456654SPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->blk)); 602fc73548eSStefan Hajnoczi blk_io_plug(s->blk); 603fc73548eSStefan Hajnoczi 6049ef9d402SStefan Hajnoczi do { 6059ef9d402SStefan Hajnoczi virtio_queue_set_notification(vq, 0); 6069ef9d402SStefan Hajnoczi 607edaffd9fSStefan Hajnoczi while ((req = virtio_blk_get_request(s, vq))) { 60807931698SFam Zheng progress = true; 60920ea686aSGreg Kurz if (virtio_blk_handle_request(req, &mrb)) { 61020ea686aSGreg Kurz virtqueue_detach_element(req->vq, &req->elem, 0); 61120ea686aSGreg Kurz virtio_blk_free_request(req); 61220ea686aSGreg Kurz break; 61320ea686aSGreg Kurz } 6146e790746SPaolo Bonzini } 6156e790746SPaolo Bonzini 6169ef9d402SStefan Hajnoczi virtio_queue_set_notification(vq, 1); 6179ef9d402SStefan Hajnoczi } while (!virtio_queue_empty(vq)); 6189ef9d402SStefan Hajnoczi 61995f7142aSPeter Lieven if (mrb.num_reqs) { 62095f7142aSPeter Lieven virtio_blk_submit_multireq(s->blk, &mrb); 62195f7142aSPeter Lieven } 622fc73548eSStefan Hajnoczi 623fc73548eSStefan Hajnoczi blk_io_unplug(s->blk); 6249d456654SPaolo Bonzini aio_context_release(blk_get_aio_context(s->blk)); 62507931698SFam Zheng return progress; 62607931698SFam Zheng } 62707931698SFam Zheng 62807931698SFam Zheng static void virtio_blk_handle_output_do(VirtIOBlock *s, VirtQueue *vq) 62907931698SFam Zheng { 63007931698SFam Zheng virtio_blk_handle_vq(s, vq); 6316e790746SPaolo Bonzini } 6326e790746SPaolo Bonzini 6338a2fad57SMichael S. Tsirkin static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) 6348a2fad57SMichael S. Tsirkin { 6358a2fad57SMichael S. Tsirkin VirtIOBlock *s = (VirtIOBlock *)vdev; 6368a2fad57SMichael S. Tsirkin 6378a2fad57SMichael S. Tsirkin if (s->dataplane) { 6388a2fad57SMichael S. Tsirkin /* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start 6398a2fad57SMichael S. Tsirkin * dataplane here instead of waiting for .set_status(). 6408a2fad57SMichael S. Tsirkin */ 6419ffe337cSPaolo Bonzini virtio_device_start_ioeventfd(vdev); 6428a2fad57SMichael S. Tsirkin if (!s->dataplane_disabled) { 6438a2fad57SMichael S. Tsirkin return; 6448a2fad57SMichael S. Tsirkin } 6458a2fad57SMichael S. Tsirkin } 64607931698SFam Zheng virtio_blk_handle_output_do(s, vq); 6478a2fad57SMichael S. Tsirkin } 6488a2fad57SMichael S. Tsirkin 6496e790746SPaolo Bonzini static void virtio_blk_dma_restart_bh(void *opaque) 6506e790746SPaolo Bonzini { 6516e790746SPaolo Bonzini VirtIOBlock *s = opaque; 6526e790746SPaolo Bonzini VirtIOBlockReq *req = s->rq; 65395f7142aSPeter Lieven MultiReqBuffer mrb = {}; 6546e790746SPaolo Bonzini 6556e790746SPaolo Bonzini qemu_bh_delete(s->bh); 6566e790746SPaolo Bonzini s->bh = NULL; 6576e790746SPaolo Bonzini 6586e790746SPaolo Bonzini s->rq = NULL; 6596e790746SPaolo Bonzini 6601919631eSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); 6616e790746SPaolo Bonzini while (req) { 6621bdb176aSzhanghailiang VirtIOBlockReq *next = req->next; 66320ea686aSGreg Kurz if (virtio_blk_handle_request(req, &mrb)) { 66420ea686aSGreg Kurz /* Device is now broken and won't do any processing until it gets 66520ea686aSGreg Kurz * reset. Already queued requests will be lost: let's purge them. 66620ea686aSGreg Kurz */ 66720ea686aSGreg Kurz while (req) { 66820ea686aSGreg Kurz next = req->next; 66920ea686aSGreg Kurz virtqueue_detach_element(req->vq, &req->elem, 0); 67020ea686aSGreg Kurz virtio_blk_free_request(req); 67120ea686aSGreg Kurz req = next; 67220ea686aSGreg Kurz } 67320ea686aSGreg Kurz break; 67420ea686aSGreg Kurz } 6751bdb176aSzhanghailiang req = next; 6766e790746SPaolo Bonzini } 6776e790746SPaolo Bonzini 67895f7142aSPeter Lieven if (mrb.num_reqs) { 67995f7142aSPeter Lieven virtio_blk_submit_multireq(s->blk, &mrb); 68095f7142aSPeter Lieven } 6811919631eSPaolo Bonzini aio_context_release(blk_get_aio_context(s->conf.conf.blk)); 6826e790746SPaolo Bonzini } 6836e790746SPaolo Bonzini 6846e790746SPaolo Bonzini static void virtio_blk_dma_restart_cb(void *opaque, int running, 6856e790746SPaolo Bonzini RunState state) 6866e790746SPaolo Bonzini { 6876e790746SPaolo Bonzini VirtIOBlock *s = opaque; 6886e790746SPaolo Bonzini 6896e790746SPaolo Bonzini if (!running) { 6906e790746SPaolo Bonzini return; 6916e790746SPaolo Bonzini } 6926e790746SPaolo Bonzini 6936e790746SPaolo Bonzini if (!s->bh) { 6944be74634SMarkus Armbruster s->bh = aio_bh_new(blk_get_aio_context(s->conf.conf.blk), 6954407c1c5SFam Zheng virtio_blk_dma_restart_bh, s); 6966e790746SPaolo Bonzini qemu_bh_schedule(s->bh); 6976e790746SPaolo Bonzini } 6986e790746SPaolo Bonzini } 6996e790746SPaolo Bonzini 7006e790746SPaolo Bonzini static void virtio_blk_reset(VirtIODevice *vdev) 7016e790746SPaolo Bonzini { 7026e790746SPaolo Bonzini VirtIOBlock *s = VIRTIO_BLK(vdev); 7036e40b3bfSAlexander Yarygin AioContext *ctx; 70426307f6aSFam Zheng VirtIOBlockReq *req; 7056e790746SPaolo Bonzini 7066e40b3bfSAlexander Yarygin ctx = blk_get_aio_context(s->blk); 7076e40b3bfSAlexander Yarygin aio_context_acquire(ctx); 7086e40b3bfSAlexander Yarygin blk_drain(s->blk); 7096e40b3bfSAlexander Yarygin 71026307f6aSFam Zheng /* We drop queued requests after blk_drain() because blk_drain() itself can 71126307f6aSFam Zheng * produce them. */ 71226307f6aSFam Zheng while (s->rq) { 71326307f6aSFam Zheng req = s->rq; 71426307f6aSFam Zheng s->rq = req->next; 71597b93c8aSStefan Hajnoczi virtqueue_detach_element(req->vq, &req->elem, 0); 71626307f6aSFam Zheng virtio_blk_free_request(req); 71726307f6aSFam Zheng } 71826307f6aSFam Zheng 7196e40b3bfSAlexander Yarygin aio_context_release(ctx); 7206e40b3bfSAlexander Yarygin 7219ffe337cSPaolo Bonzini assert(!s->dataplane_started); 7224be74634SMarkus Armbruster blk_set_enable_write_cache(s->blk, s->original_wce); 7236e790746SPaolo Bonzini } 7246e790746SPaolo Bonzini 7256e790746SPaolo Bonzini /* coalesce internal state, copy to pci i/o region 0 7266e790746SPaolo Bonzini */ 7276e790746SPaolo Bonzini static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) 7286e790746SPaolo Bonzini { 7296e790746SPaolo Bonzini VirtIOBlock *s = VIRTIO_BLK(vdev); 7302a30307fSMarkus Armbruster BlockConf *conf = &s->conf.conf; 7316e790746SPaolo Bonzini struct virtio_blk_config blkcfg; 7326e790746SPaolo Bonzini uint64_t capacity; 73317d0bc01SStefan Hajnoczi int64_t length; 734f7516731SMarkus Armbruster int blk_size = conf->logical_block_size; 7356e790746SPaolo Bonzini 7364be74634SMarkus Armbruster blk_get_geometry(s->blk, &capacity); 7376e790746SPaolo Bonzini memset(&blkcfg, 0, sizeof(blkcfg)); 738783d1897SRusty Russell virtio_stq_p(vdev, &blkcfg.capacity, capacity); 739783d1897SRusty Russell virtio_stl_p(vdev, &blkcfg.seg_max, 128 - 2); 740907eb3e5SMichael S. Tsirkin virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls); 741783d1897SRusty Russell virtio_stl_p(vdev, &blkcfg.blk_size, blk_size); 742f7516731SMarkus Armbruster virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size); 743f7516731SMarkus Armbruster virtio_stw_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size); 744907eb3e5SMichael S. Tsirkin blkcfg.geometry.heads = conf->heads; 7456e790746SPaolo Bonzini /* 7466e790746SPaolo Bonzini * We must ensure that the block device capacity is a multiple of 747e03ba136SPeter Maydell * the logical block size. If that is not the case, let's use 7486e790746SPaolo Bonzini * sector_mask to adopt the geometry to have a correct picture. 7496e790746SPaolo Bonzini * For those devices where the capacity is ok for the given geometry 750e03ba136SPeter Maydell * we don't touch the sector value of the geometry, since some devices 7516e790746SPaolo Bonzini * (like s390 dasd) need a specific value. Here the capacity is already 7526e790746SPaolo Bonzini * cyls*heads*secs*blk_size and the sector value is not block size 7536e790746SPaolo Bonzini * divided by 512 - instead it is the amount of blk_size blocks 7546e790746SPaolo Bonzini * per track (cylinder). 7556e790746SPaolo Bonzini */ 75617d0bc01SStefan Hajnoczi length = blk_getlength(s->blk); 75717d0bc01SStefan Hajnoczi if (length > 0 && length / conf->heads / conf->secs % blk_size) { 758907eb3e5SMichael S. Tsirkin blkcfg.geometry.sectors = conf->secs & ~s->sector_mask; 7596e790746SPaolo Bonzini } else { 760907eb3e5SMichael S. Tsirkin blkcfg.geometry.sectors = conf->secs; 7616e790746SPaolo Bonzini } 7626e790746SPaolo Bonzini blkcfg.size_max = 0; 763f7516731SMarkus Armbruster blkcfg.physical_block_exp = get_physical_block_exp(conf); 7646e790746SPaolo Bonzini blkcfg.alignment_offset = 0; 7654be74634SMarkus Armbruster blkcfg.wce = blk_enable_write_cache(s->blk); 7662f270590SStefan Hajnoczi virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues); 7676e790746SPaolo Bonzini memcpy(config, &blkcfg, sizeof(struct virtio_blk_config)); 7686e790746SPaolo Bonzini } 7696e790746SPaolo Bonzini 7706e790746SPaolo Bonzini static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config) 7716e790746SPaolo Bonzini { 7726e790746SPaolo Bonzini VirtIOBlock *s = VIRTIO_BLK(vdev); 7736e790746SPaolo Bonzini struct virtio_blk_config blkcfg; 7746e790746SPaolo Bonzini 7756e790746SPaolo Bonzini memcpy(&blkcfg, config, sizeof(blkcfg)); 7766d7e73d6SFam Zheng 7774be74634SMarkus Armbruster aio_context_acquire(blk_get_aio_context(s->blk)); 7784be74634SMarkus Armbruster blk_set_enable_write_cache(s->blk, blkcfg.wce != 0); 7794be74634SMarkus Armbruster aio_context_release(blk_get_aio_context(s->blk)); 7806e790746SPaolo Bonzini } 7816e790746SPaolo Bonzini 7829d5b731dSJason Wang static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features, 7839d5b731dSJason Wang Error **errp) 7846e790746SPaolo Bonzini { 7856e790746SPaolo Bonzini VirtIOBlock *s = VIRTIO_BLK(vdev); 7866e790746SPaolo Bonzini 7870cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX); 7880cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY); 7890cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY); 7900cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE); 79195129d6fSCornelia Huck if (virtio_has_feature(features, VIRTIO_F_VERSION_1)) { 792efb8206cSJason Wang if (s->conf.scsi) { 793efb8206cSJason Wang error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0"); 794efb8206cSJason Wang return 0; 795efb8206cSJason Wang } 796efb8206cSJason Wang } else { 797c9b11f97SJason Wang virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT); 798efb8206cSJason Wang virtio_add_feature(&features, VIRTIO_BLK_F_SCSI); 799efb8206cSJason Wang } 8006e790746SPaolo Bonzini 8012a30307fSMarkus Armbruster if (s->conf.config_wce) { 8020cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_CONFIG_WCE); 8036e790746SPaolo Bonzini } 8044be74634SMarkus Armbruster if (blk_enable_write_cache(s->blk)) { 8050cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_WCE); 8064be74634SMarkus Armbruster } 8074be74634SMarkus Armbruster if (blk_is_read_only(s->blk)) { 8080cd09c3aSCornelia Huck virtio_add_feature(&features, VIRTIO_BLK_F_RO); 8094be74634SMarkus Armbruster } 8102f270590SStefan Hajnoczi if (s->conf.num_queues > 1) { 8112f270590SStefan Hajnoczi virtio_add_feature(&features, VIRTIO_BLK_F_MQ); 8122f270590SStefan Hajnoczi } 8136e790746SPaolo Bonzini 8146e790746SPaolo Bonzini return features; 8156e790746SPaolo Bonzini } 8166e790746SPaolo Bonzini 8176e790746SPaolo Bonzini static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status) 8186e790746SPaolo Bonzini { 8196e790746SPaolo Bonzini VirtIOBlock *s = VIRTIO_BLK(vdev); 8206e790746SPaolo Bonzini 8219ffe337cSPaolo Bonzini if (!(status & (VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK))) { 8229ffe337cSPaolo Bonzini assert(!s->dataplane_started); 8236e790746SPaolo Bonzini } 8246e790746SPaolo Bonzini 8256e790746SPaolo Bonzini if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { 8266e790746SPaolo Bonzini return; 8276e790746SPaolo Bonzini } 8286e790746SPaolo Bonzini 829ef5bc962SPaolo Bonzini /* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send 830ef5bc962SPaolo Bonzini * cache flushes. Thus, the "auto writethrough" behavior is never 831ef5bc962SPaolo Bonzini * necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature. 832ef5bc962SPaolo Bonzini * Leaving it enabled would break the following sequence: 833ef5bc962SPaolo Bonzini * 834ef5bc962SPaolo Bonzini * Guest started with "-drive cache=writethrough" 835ef5bc962SPaolo Bonzini * Guest sets status to 0 836ef5bc962SPaolo Bonzini * Guest sets DRIVER bit in status field 837ef5bc962SPaolo Bonzini * Guest reads host features (WCE=0, CONFIG_WCE=1) 838ef5bc962SPaolo Bonzini * Guest writes guest features (WCE=0, CONFIG_WCE=1) 839ef5bc962SPaolo Bonzini * Guest writes 1 to the WCE configuration field (writeback mode) 840ef5bc962SPaolo Bonzini * Guest sets DRIVER_OK bit in status field 841ef5bc962SPaolo Bonzini * 8424be74634SMarkus Armbruster * s->blk would erroneously be placed in writethrough mode. 843ef5bc962SPaolo Bonzini */ 84495129d6fSCornelia Huck if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) { 8454be74634SMarkus Armbruster aio_context_acquire(blk_get_aio_context(s->blk)); 8464be74634SMarkus Armbruster blk_set_enable_write_cache(s->blk, 84795129d6fSCornelia Huck virtio_vdev_has_feature(vdev, 84895129d6fSCornelia Huck VIRTIO_BLK_F_WCE)); 8494be74634SMarkus Armbruster aio_context_release(blk_get_aio_context(s->blk)); 8506e790746SPaolo Bonzini } 851ef5bc962SPaolo Bonzini } 8526e790746SPaolo Bonzini 853b2b295a7SGreg Kurz static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f) 854b2b295a7SGreg Kurz { 855b2b295a7SGreg Kurz VirtIOBlock *s = VIRTIO_BLK(vdev); 856b2b295a7SGreg Kurz VirtIOBlockReq *req = s->rq; 8576e790746SPaolo Bonzini 8586e790746SPaolo Bonzini while (req) { 8596e790746SPaolo Bonzini qemu_put_sbyte(f, 1); 86030d8bf6dSStefan Hajnoczi 86130d8bf6dSStefan Hajnoczi if (s->conf.num_queues > 1) { 86230d8bf6dSStefan Hajnoczi qemu_put_be32(f, virtio_get_queue_index(req->vq)); 86330d8bf6dSStefan Hajnoczi } 86430d8bf6dSStefan Hajnoczi 865ab281c17SPaolo Bonzini qemu_put_virtqueue_element(f, &req->elem); 8666e790746SPaolo Bonzini req = req->next; 8676e790746SPaolo Bonzini } 8686e790746SPaolo Bonzini qemu_put_sbyte(f, 0); 8696e790746SPaolo Bonzini } 8706e790746SPaolo Bonzini 871b2b295a7SGreg Kurz static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f, 872b2b295a7SGreg Kurz int version_id) 873b2b295a7SGreg Kurz { 874b2b295a7SGreg Kurz VirtIOBlock *s = VIRTIO_BLK(vdev); 875b2b295a7SGreg Kurz 8766e790746SPaolo Bonzini while (qemu_get_sbyte(f)) { 87730d8bf6dSStefan Hajnoczi unsigned nvqs = s->conf.num_queues; 87830d8bf6dSStefan Hajnoczi unsigned vq_idx = 0; 879ab281c17SPaolo Bonzini VirtIOBlockReq *req; 88030d8bf6dSStefan Hajnoczi 88130d8bf6dSStefan Hajnoczi if (nvqs > 1) { 88230d8bf6dSStefan Hajnoczi vq_idx = qemu_get_be32(f); 88330d8bf6dSStefan Hajnoczi 88430d8bf6dSStefan Hajnoczi if (vq_idx >= nvqs) { 88530d8bf6dSStefan Hajnoczi error_report("Invalid virtqueue index in request list: %#x", 88630d8bf6dSStefan Hajnoczi vq_idx); 88730d8bf6dSStefan Hajnoczi return -EINVAL; 88830d8bf6dSStefan Hajnoczi } 88930d8bf6dSStefan Hajnoczi } 89030d8bf6dSStefan Hajnoczi 8918607f5c3SJason Wang req = qemu_get_virtqueue_element(vdev, f, sizeof(VirtIOBlockReq)); 89230d8bf6dSStefan Hajnoczi virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req); 8936e790746SPaolo Bonzini req->next = s->rq; 8946e790746SPaolo Bonzini s->rq = req; 8956e790746SPaolo Bonzini } 8966e790746SPaolo Bonzini 8976e790746SPaolo Bonzini return 0; 8986e790746SPaolo Bonzini } 8996e790746SPaolo Bonzini 9006e790746SPaolo Bonzini static void virtio_blk_resize(void *opaque) 9016e790746SPaolo Bonzini { 9026e790746SPaolo Bonzini VirtIODevice *vdev = VIRTIO_DEVICE(opaque); 9036e790746SPaolo Bonzini 9046e790746SPaolo Bonzini virtio_notify_config(vdev); 9056e790746SPaolo Bonzini } 9066e790746SPaolo Bonzini 9076e790746SPaolo Bonzini static const BlockDevOps virtio_block_ops = { 9086e790746SPaolo Bonzini .resize_cb = virtio_blk_resize, 9096e790746SPaolo Bonzini }; 9106e790746SPaolo Bonzini 91175884afdSAndreas Färber static void virtio_blk_device_realize(DeviceState *dev, Error **errp) 9126e790746SPaolo Bonzini { 91375884afdSAndreas Färber VirtIODevice *vdev = VIRTIO_DEVICE(dev); 914179b417eSAndreas Färber VirtIOBlock *s = VIRTIO_BLK(dev); 9152a30307fSMarkus Armbruster VirtIOBlkConf *conf = &s->conf; 9163ffeeef7SAndreas Färber Error *err = NULL; 9172f270590SStefan Hajnoczi unsigned i; 9186e790746SPaolo Bonzini 9194be74634SMarkus Armbruster if (!conf->conf.blk) { 92075884afdSAndreas Färber error_setg(errp, "drive property not set"); 92175884afdSAndreas Färber return; 9226e790746SPaolo Bonzini } 9234be74634SMarkus Armbruster if (!blk_is_inserted(conf->conf.blk)) { 92475884afdSAndreas Färber error_setg(errp, "Device needs media, but drive is empty"); 92575884afdSAndreas Färber return; 9266e790746SPaolo Bonzini } 9272f270590SStefan Hajnoczi if (!conf->num_queues) { 9282f270590SStefan Hajnoczi error_setg(errp, "num-queues property must be larger than 0"); 9292f270590SStefan Hajnoczi return; 9302f270590SStefan Hajnoczi } 9316e790746SPaolo Bonzini 9322a30307fSMarkus Armbruster blkconf_serial(&conf->conf, &conf->serial); 933*ceff3e1fSMao Zhongyi if (!blkconf_apply_backend_options(&conf->conf, 934a17c17a2SKevin Wolf blk_is_read_only(conf->conf.blk), true, 935*ceff3e1fSMao Zhongyi errp)) { 936a17c17a2SKevin Wolf return; 937a17c17a2SKevin Wolf } 9384be74634SMarkus Armbruster s->original_wce = blk_enable_write_cache(conf->conf.blk); 939*ceff3e1fSMao Zhongyi if (!blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, errp)) { 94075884afdSAndreas Färber return; 9416e790746SPaolo Bonzini } 942*ceff3e1fSMao Zhongyi 9430eb28a42SEkaterina Tumanova blkconf_blocksizes(&conf->conf); 9446e790746SPaolo Bonzini 9456e790746SPaolo Bonzini virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK, 9466e790746SPaolo Bonzini sizeof(struct virtio_blk_config)); 9476e790746SPaolo Bonzini 9484be74634SMarkus Armbruster s->blk = conf->conf.blk; 9496e790746SPaolo Bonzini s->rq = NULL; 9502a30307fSMarkus Armbruster s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1; 9516e790746SPaolo Bonzini 9522f270590SStefan Hajnoczi for (i = 0; i < conf->num_queues; i++) { 9539ffe337cSPaolo Bonzini virtio_add_queue(vdev, 128, virtio_blk_handle_output); 9542f270590SStefan Hajnoczi } 9552a30307fSMarkus Armbruster virtio_blk_data_plane_create(vdev, conf, &s->dataplane, &err); 9563ffeeef7SAndreas Färber if (err != NULL) { 95775884afdSAndreas Färber error_propagate(errp, err); 9586a1a8cc7SKONRAD Frederic virtio_cleanup(vdev); 95975884afdSAndreas Färber return; 9606e790746SPaolo Bonzini } 9616e790746SPaolo Bonzini 9626e790746SPaolo Bonzini s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); 9634be74634SMarkus Armbruster blk_set_dev_ops(s->blk, &virtio_block_ops, s); 9644be74634SMarkus Armbruster blk_set_guest_block_size(s->blk, s->conf.conf.logical_block_size); 9656e790746SPaolo Bonzini 9664be74634SMarkus Armbruster blk_iostatus_enable(s->blk); 9676e790746SPaolo Bonzini } 9686e790746SPaolo Bonzini 969306ec6c3SAndreas Färber static void virtio_blk_device_unrealize(DeviceState *dev, Error **errp) 9706e790746SPaolo Bonzini { 971306ec6c3SAndreas Färber VirtIODevice *vdev = VIRTIO_DEVICE(dev); 972306ec6c3SAndreas Färber VirtIOBlock *s = VIRTIO_BLK(dev); 973306ec6c3SAndreas Färber 9746e790746SPaolo Bonzini virtio_blk_data_plane_destroy(s->dataplane); 9756e790746SPaolo Bonzini s->dataplane = NULL; 9766e790746SPaolo Bonzini qemu_del_vm_change_state_handler(s->change); 9774be74634SMarkus Armbruster blockdev_mark_auto_del(s->blk); 9786a1a8cc7SKONRAD Frederic virtio_cleanup(vdev); 9796e790746SPaolo Bonzini } 9806e790746SPaolo Bonzini 981467b3f33SStefan Hajnoczi static void virtio_blk_instance_init(Object *obj) 982467b3f33SStefan Hajnoczi { 983467b3f33SStefan Hajnoczi VirtIOBlock *s = VIRTIO_BLK(obj); 984467b3f33SStefan Hajnoczi 9852a30307fSMarkus Armbruster device_add_bootindex_property(obj, &s->conf.conf.bootindex, 9863342ec32SGonglei "bootindex", "/disk@0,0", 9873342ec32SGonglei DEVICE(obj), NULL); 988467b3f33SStefan Hajnoczi } 989467b3f33SStefan Hajnoczi 990977a117fSHalil Pasic static const VMStateDescription vmstate_virtio_blk = { 991977a117fSHalil Pasic .name = "virtio-blk", 992977a117fSHalil Pasic .minimum_version_id = 2, 993977a117fSHalil Pasic .version_id = 2, 994977a117fSHalil Pasic .fields = (VMStateField[]) { 995977a117fSHalil Pasic VMSTATE_VIRTIO_DEVICE, 996977a117fSHalil Pasic VMSTATE_END_OF_LIST() 997977a117fSHalil Pasic }, 998977a117fSHalil Pasic }; 999bbded32cSDr. David Alan Gilbert 10006e790746SPaolo Bonzini static Property virtio_blk_properties[] = { 10012a30307fSMarkus Armbruster DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf), 10028c398252SKevin Wolf DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf), 10032a30307fSMarkus Armbruster DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf), 10042a30307fSMarkus Armbruster DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial), 10052a30307fSMarkus Armbruster DEFINE_PROP_BIT("config-wce", VirtIOBlock, conf.config_wce, 0, true), 100632a877e4SStefan Hajnoczi #ifdef __linux__ 1007ed65fd1aSCornelia Huck DEFINE_PROP_BIT("scsi", VirtIOBlock, conf.scsi, 0, false), 100832a877e4SStefan Hajnoczi #endif 1009c99495acSPeter Lieven DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0, 1010c99495acSPeter Lieven true), 10112f270590SStefan Hajnoczi DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues, 1), 1012d679ac09SFam Zheng DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD, 1013d679ac09SFam Zheng IOThread *), 10146e790746SPaolo Bonzini DEFINE_PROP_END_OF_LIST(), 10156e790746SPaolo Bonzini }; 10166e790746SPaolo Bonzini 10176e790746SPaolo Bonzini static void virtio_blk_class_init(ObjectClass *klass, void *data) 10186e790746SPaolo Bonzini { 10196e790746SPaolo Bonzini DeviceClass *dc = DEVICE_CLASS(klass); 10206e790746SPaolo Bonzini VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 102175884afdSAndreas Färber 10226e790746SPaolo Bonzini dc->props = virtio_blk_properties; 1023bbded32cSDr. David Alan Gilbert dc->vmsd = &vmstate_virtio_blk; 1024125ee0edSMarcel Apfelbaum set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 102575884afdSAndreas Färber vdc->realize = virtio_blk_device_realize; 1026306ec6c3SAndreas Färber vdc->unrealize = virtio_blk_device_unrealize; 10276e790746SPaolo Bonzini vdc->get_config = virtio_blk_update_config; 10286e790746SPaolo Bonzini vdc->set_config = virtio_blk_set_config; 10296e790746SPaolo Bonzini vdc->get_features = virtio_blk_get_features; 10306e790746SPaolo Bonzini vdc->set_status = virtio_blk_set_status; 10316e790746SPaolo Bonzini vdc->reset = virtio_blk_reset; 1032b2b295a7SGreg Kurz vdc->save = virtio_blk_save_device; 1033b2b295a7SGreg Kurz vdc->load = virtio_blk_load_device; 10349ffe337cSPaolo Bonzini vdc->start_ioeventfd = virtio_blk_data_plane_start; 10359ffe337cSPaolo Bonzini vdc->stop_ioeventfd = virtio_blk_data_plane_stop; 10366e790746SPaolo Bonzini } 10376e790746SPaolo Bonzini 1038b5c7ceafSChanglong Xie static const TypeInfo virtio_blk_info = { 10396e790746SPaolo Bonzini .name = TYPE_VIRTIO_BLK, 10406e790746SPaolo Bonzini .parent = TYPE_VIRTIO_DEVICE, 10416e790746SPaolo Bonzini .instance_size = sizeof(VirtIOBlock), 1042467b3f33SStefan Hajnoczi .instance_init = virtio_blk_instance_init, 10436e790746SPaolo Bonzini .class_init = virtio_blk_class_init, 10446e790746SPaolo Bonzini }; 10456e790746SPaolo Bonzini 10466e790746SPaolo Bonzini static void virtio_register_types(void) 10476e790746SPaolo Bonzini { 1048b5c7ceafSChanglong Xie type_register_static(&virtio_blk_info); 10496e790746SPaolo Bonzini } 10506e790746SPaolo Bonzini 10516e790746SPaolo Bonzini type_init(virtio_register_types) 1052