This will help us to avoid the scsi device disappearing after we took a reference to it. It doesn't by itself forbid case when we try to access an unrealized device Suggested-by: Stefan Hajnoczi <stefanha@gmail.com> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20200913160259.32145-9-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20201006123904.610658-13-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1064 lines
32 KiB
C
1064 lines
32 KiB
C
/*
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* Virtio SCSI HBA
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*
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* Copyright IBM, Corp. 2010
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* Copyright Red Hat, Inc. 2011
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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* Paolo Bonzini <pbonzini@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "standard-headers/linux/virtio_ids.h"
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#include "hw/virtio/virtio-scsi.h"
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#include "migration/qemu-file-types.h"
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#include "qemu/error-report.h"
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#include "qemu/iov.h"
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#include "qemu/module.h"
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#include "sysemu/block-backend.h"
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#include "hw/qdev-properties.h"
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#include "hw/scsi/scsi.h"
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#include "scsi/constants.h"
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#include "hw/virtio/virtio-bus.h"
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#include "hw/virtio/virtio-access.h"
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static inline int virtio_scsi_get_lun(uint8_t *lun)
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{
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return ((lun[2] << 8) | lun[3]) & 0x3FFF;
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}
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static inline SCSIDevice *virtio_scsi_device_get(VirtIOSCSI *s, uint8_t *lun)
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{
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if (lun[0] != 1) {
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return NULL;
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}
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if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) {
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return NULL;
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}
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return scsi_device_get(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun));
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}
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void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(s);
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const size_t zero_skip =
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offsetof(VirtIOSCSIReq, resp_iov) + sizeof(req->resp_iov);
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req->vq = vq;
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req->dev = s;
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qemu_sglist_init(&req->qsgl, DEVICE(s), 8, vdev->dma_as);
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qemu_iovec_init(&req->resp_iov, 1);
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memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip);
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}
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void virtio_scsi_free_req(VirtIOSCSIReq *req)
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{
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qemu_iovec_destroy(&req->resp_iov);
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qemu_sglist_destroy(&req->qsgl);
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g_free(req);
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}
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static void virtio_scsi_complete_req(VirtIOSCSIReq *req)
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{
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VirtIOSCSI *s = req->dev;
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VirtQueue *vq = req->vq;
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VirtIODevice *vdev = VIRTIO_DEVICE(s);
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qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size);
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virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size);
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if (s->dataplane_started && !s->dataplane_fenced) {
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virtio_notify_irqfd(vdev, vq);
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} else {
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virtio_notify(vdev, vq);
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}
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if (req->sreq) {
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req->sreq->hba_private = NULL;
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scsi_req_unref(req->sreq);
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}
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virtio_scsi_free_req(req);
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}
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static void virtio_scsi_bad_req(VirtIOSCSIReq *req)
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{
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virtio_error(VIRTIO_DEVICE(req->dev), "wrong size for virtio-scsi headers");
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virtqueue_detach_element(req->vq, &req->elem, 0);
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virtio_scsi_free_req(req);
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}
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static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov,
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hwaddr *addr, int num, size_t skip)
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{
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QEMUSGList *qsgl = &req->qsgl;
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size_t copied = 0;
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while (num) {
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if (skip >= iov->iov_len) {
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skip -= iov->iov_len;
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} else {
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qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip);
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copied += iov->iov_len - skip;
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skip = 0;
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}
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iov++;
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addr++;
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num--;
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}
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assert(skip == 0);
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return copied;
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}
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static int virtio_scsi_parse_req(VirtIOSCSIReq *req,
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unsigned req_size, unsigned resp_size)
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{
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VirtIODevice *vdev = (VirtIODevice *) req->dev;
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size_t in_size, out_size;
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if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0,
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&req->req, req_size) < req_size) {
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return -EINVAL;
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}
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if (qemu_iovec_concat_iov(&req->resp_iov,
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req->elem.in_sg, req->elem.in_num, 0,
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resp_size) < resp_size) {
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return -EINVAL;
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}
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req->resp_size = resp_size;
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/* Old BIOSes left some padding by mistake after the req_size/resp_size.
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* As a workaround, always consider the first buffer as the virtio-scsi
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* request/response, making the payload start at the second element
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* of the iovec.
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*
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* The actual length of the response header, stored in req->resp_size,
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* does not change.
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*
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* TODO: always disable this workaround for virtio 1.0 devices.
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*/
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if (!virtio_vdev_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) {
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if (req->elem.out_num) {
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req_size = req->elem.out_sg[0].iov_len;
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}
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if (req->elem.in_num) {
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resp_size = req->elem.in_sg[0].iov_len;
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}
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}
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out_size = qemu_sgl_concat(req, req->elem.out_sg,
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&req->elem.out_addr[0], req->elem.out_num,
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req_size);
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in_size = qemu_sgl_concat(req, req->elem.in_sg,
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&req->elem.in_addr[0], req->elem.in_num,
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resp_size);
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if (out_size && in_size) {
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return -ENOTSUP;
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}
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if (out_size) {
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req->mode = SCSI_XFER_TO_DEV;
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} else if (in_size) {
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req->mode = SCSI_XFER_FROM_DEV;
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}
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return 0;
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}
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static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq)
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{
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VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s;
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VirtIOSCSIReq *req;
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req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + vs->cdb_size);
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if (!req) {
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return NULL;
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}
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virtio_scsi_init_req(s, vq, req);
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return req;
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}
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static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq)
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{
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VirtIOSCSIReq *req = sreq->hba_private;
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev);
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VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
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uint32_t n = virtio_get_queue_index(req->vq) - VIRTIO_SCSI_VQ_NUM_FIXED;
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assert(n < vs->conf.num_queues);
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qemu_put_be32s(f, &n);
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qemu_put_virtqueue_element(vdev, f, &req->elem);
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}
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static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
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{
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SCSIBus *bus = sreq->bus;
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VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
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VirtIODevice *vdev = VIRTIO_DEVICE(s);
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VirtIOSCSIReq *req;
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uint32_t n;
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qemu_get_be32s(f, &n);
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assert(n < vs->conf.num_queues);
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req = qemu_get_virtqueue_element(vdev, f,
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sizeof(VirtIOSCSIReq) + vs->cdb_size);
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virtio_scsi_init_req(s, vs->cmd_vqs[n], req);
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if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
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sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) {
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error_report("invalid SCSI request migration data");
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exit(1);
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}
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scsi_req_ref(sreq);
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req->sreq = sreq;
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if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
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assert(req->sreq->cmd.mode == req->mode);
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}
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return req;
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}
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typedef struct {
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Notifier notifier;
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VirtIOSCSIReq *tmf_req;
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} VirtIOSCSICancelNotifier;
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static void virtio_scsi_cancel_notify(Notifier *notifier, void *data)
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{
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VirtIOSCSICancelNotifier *n = container_of(notifier,
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VirtIOSCSICancelNotifier,
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notifier);
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if (--n->tmf_req->remaining == 0) {
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virtio_scsi_complete_req(n->tmf_req);
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}
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g_free(n);
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}
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static inline void virtio_scsi_ctx_check(VirtIOSCSI *s, SCSIDevice *d)
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{
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if (s->dataplane_started && d && blk_is_available(d->conf.blk)) {
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assert(blk_get_aio_context(d->conf.blk) == s->ctx);
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}
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}
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/* Return 0 if the request is ready to be completed and return to guest;
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* -EINPROGRESS if the request is submitted and will be completed later, in the
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* case of async cancellation. */
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static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req)
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{
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SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun);
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SCSIRequest *r, *next;
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BusChild *kid;
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int target;
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int ret = 0;
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virtio_scsi_ctx_check(s, d);
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/* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
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req->resp.tmf.response = VIRTIO_SCSI_S_OK;
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/*
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* req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s()
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* to avoid compiler errors.
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*/
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req->req.tmf.subtype =
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virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype);
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switch (req->req.tmf.subtype) {
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case VIRTIO_SCSI_T_TMF_ABORT_TASK:
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case VIRTIO_SCSI_T_TMF_QUERY_TASK:
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if (!d) {
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goto fail;
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}
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if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
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goto incorrect_lun;
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}
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QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
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VirtIOSCSIReq *cmd_req = r->hba_private;
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if (cmd_req && cmd_req->req.cmd.tag == req->req.tmf.tag) {
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break;
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}
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}
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if (r) {
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/*
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* Assert that the request has not been completed yet, we
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* check for it in the loop above.
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*/
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assert(r->hba_private);
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if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) {
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/* "If the specified command is present in the task set, then
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* return a service response set to FUNCTION SUCCEEDED".
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*/
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req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
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} else {
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VirtIOSCSICancelNotifier *notifier;
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req->remaining = 1;
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notifier = g_new(VirtIOSCSICancelNotifier, 1);
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notifier->tmf_req = req;
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notifier->notifier.notify = virtio_scsi_cancel_notify;
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scsi_req_cancel_async(r, ¬ifier->notifier);
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ret = -EINPROGRESS;
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}
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}
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break;
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case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET:
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if (!d) {
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goto fail;
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}
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if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
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goto incorrect_lun;
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}
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s->resetting++;
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qdev_reset_all(&d->qdev);
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s->resetting--;
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break;
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case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
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case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
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case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET:
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if (!d) {
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goto fail;
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}
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if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
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goto incorrect_lun;
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}
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/* Add 1 to "remaining" until virtio_scsi_do_tmf returns.
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* This way, if the bus starts calling back to the notifiers
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* even before we finish the loop, virtio_scsi_cancel_notify
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* will not complete the TMF too early.
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*/
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req->remaining = 1;
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QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
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if (r->hba_private) {
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if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) {
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/* "If there is any command present in the task set, then
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* return a service response set to FUNCTION SUCCEEDED".
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*/
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req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
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break;
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} else {
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VirtIOSCSICancelNotifier *notifier;
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req->remaining++;
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notifier = g_new(VirtIOSCSICancelNotifier, 1);
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notifier->notifier.notify = virtio_scsi_cancel_notify;
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notifier->tmf_req = req;
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scsi_req_cancel_async(r, ¬ifier->notifier);
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}
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}
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}
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if (--req->remaining > 0) {
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ret = -EINPROGRESS;
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}
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break;
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case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
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target = req->req.tmf.lun[1];
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s->resetting++;
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|
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rcu_read_lock();
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QTAILQ_FOREACH_RCU(kid, &s->bus.qbus.children, sibling) {
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SCSIDevice *d1 = SCSI_DEVICE(kid->child);
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if (d1->channel == 0 && d1->id == target) {
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qdev_reset_all(&d1->qdev);
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}
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}
|
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rcu_read_unlock();
|
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|
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s->resetting--;
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break;
|
|
|
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case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
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default:
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req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
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break;
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}
|
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|
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object_unref(OBJECT(d));
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return ret;
|
|
|
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incorrect_lun:
|
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req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN;
|
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object_unref(OBJECT(d));
|
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return ret;
|
|
|
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fail:
|
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req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET;
|
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object_unref(OBJECT(d));
|
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return ret;
|
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}
|
|
|
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static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req)
|
|
{
|
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VirtIODevice *vdev = (VirtIODevice *)s;
|
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uint32_t type;
|
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int r = 0;
|
|
|
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if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0,
|
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&type, sizeof(type)) < sizeof(type)) {
|
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virtio_scsi_bad_req(req);
|
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return;
|
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}
|
|
|
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virtio_tswap32s(vdev, &type);
|
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if (type == VIRTIO_SCSI_T_TMF) {
|
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if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq),
|
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sizeof(VirtIOSCSICtrlTMFResp)) < 0) {
|
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virtio_scsi_bad_req(req);
|
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return;
|
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} else {
|
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r = virtio_scsi_do_tmf(s, req);
|
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}
|
|
|
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} else if (type == VIRTIO_SCSI_T_AN_QUERY ||
|
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type == VIRTIO_SCSI_T_AN_SUBSCRIBE) {
|
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if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq),
|
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sizeof(VirtIOSCSICtrlANResp)) < 0) {
|
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virtio_scsi_bad_req(req);
|
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return;
|
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} else {
|
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req->resp.an.event_actual = 0;
|
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req->resp.an.response = VIRTIO_SCSI_S_OK;
|
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}
|
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}
|
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if (r == 0) {
|
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virtio_scsi_complete_req(req);
|
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} else {
|
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assert(r == -EINPROGRESS);
|
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}
|
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}
|
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|
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bool virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq)
|
|
{
|
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VirtIOSCSIReq *req;
|
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bool progress = false;
|
|
|
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while ((req = virtio_scsi_pop_req(s, vq))) {
|
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progress = true;
|
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virtio_scsi_handle_ctrl_req(s, req);
|
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}
|
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return progress;
|
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}
|
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|
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static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIOSCSI *s = (VirtIOSCSI *)vdev;
|
|
|
|
if (s->ctx) {
|
|
virtio_device_start_ioeventfd(vdev);
|
|
if (!s->dataplane_fenced) {
|
|
return;
|
|
}
|
|
}
|
|
virtio_scsi_acquire(s);
|
|
virtio_scsi_handle_ctrl_vq(s, vq);
|
|
virtio_scsi_release(s);
|
|
}
|
|
|
|
static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req)
|
|
{
|
|
/* Sense data is not in req->resp and is copied separately
|
|
* in virtio_scsi_command_complete.
|
|
*/
|
|
req->resp_size = sizeof(VirtIOSCSICmdResp);
|
|
virtio_scsi_complete_req(req);
|
|
}
|
|
|
|
static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status,
|
|
size_t resid)
|
|
{
|
|
VirtIOSCSIReq *req = r->hba_private;
|
|
uint8_t sense[SCSI_SENSE_BUF_SIZE];
|
|
uint32_t sense_len;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
|
|
|
|
if (r->io_canceled) {
|
|
return;
|
|
}
|
|
|
|
req->resp.cmd.response = VIRTIO_SCSI_S_OK;
|
|
req->resp.cmd.status = status;
|
|
if (req->resp.cmd.status == GOOD) {
|
|
req->resp.cmd.resid = virtio_tswap32(vdev, resid);
|
|
} else {
|
|
req->resp.cmd.resid = 0;
|
|
sense_len = scsi_req_get_sense(r, sense, sizeof(sense));
|
|
sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd));
|
|
qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd),
|
|
sense, sense_len);
|
|
req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len);
|
|
}
|
|
virtio_scsi_complete_cmd_req(req);
|
|
}
|
|
|
|
static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd,
|
|
uint8_t *buf, void *hba_private)
|
|
{
|
|
VirtIOSCSIReq *req = hba_private;
|
|
|
|
if (cmd->len == 0) {
|
|
cmd->len = MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE, SCSI_CMD_BUF_SIZE);
|
|
memcpy(cmd->buf, buf, cmd->len);
|
|
}
|
|
|
|
/* Extract the direction and mode directly from the request, for
|
|
* host device passthrough.
|
|
*/
|
|
cmd->xfer = req->qsgl.size;
|
|
cmd->mode = req->mode;
|
|
return 0;
|
|
}
|
|
|
|
static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
|
|
{
|
|
VirtIOSCSIReq *req = r->hba_private;
|
|
|
|
return &req->qsgl;
|
|
}
|
|
|
|
static void virtio_scsi_request_cancelled(SCSIRequest *r)
|
|
{
|
|
VirtIOSCSIReq *req = r->hba_private;
|
|
|
|
if (!req) {
|
|
return;
|
|
}
|
|
if (req->dev->resetting) {
|
|
req->resp.cmd.response = VIRTIO_SCSI_S_RESET;
|
|
} else {
|
|
req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED;
|
|
}
|
|
virtio_scsi_complete_cmd_req(req);
|
|
}
|
|
|
|
static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)
|
|
{
|
|
req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE;
|
|
virtio_scsi_complete_cmd_req(req);
|
|
}
|
|
|
|
static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req)
|
|
{
|
|
VirtIOSCSICommon *vs = &s->parent_obj;
|
|
SCSIDevice *d;
|
|
int rc;
|
|
|
|
rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
|
|
sizeof(VirtIOSCSICmdResp) + vs->sense_size);
|
|
if (rc < 0) {
|
|
if (rc == -ENOTSUP) {
|
|
virtio_scsi_fail_cmd_req(req);
|
|
return -ENOTSUP;
|
|
} else {
|
|
virtio_scsi_bad_req(req);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
d = virtio_scsi_device_get(s, req->req.cmd.lun);
|
|
if (!d) {
|
|
req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
|
|
virtio_scsi_complete_cmd_req(req);
|
|
return -ENOENT;
|
|
}
|
|
virtio_scsi_ctx_check(s, d);
|
|
req->sreq = scsi_req_new(d, req->req.cmd.tag,
|
|
virtio_scsi_get_lun(req->req.cmd.lun),
|
|
req->req.cmd.cdb, req);
|
|
|
|
if (req->sreq->cmd.mode != SCSI_XFER_NONE
|
|
&& (req->sreq->cmd.mode != req->mode ||
|
|
req->sreq->cmd.xfer > req->qsgl.size)) {
|
|
req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN;
|
|
virtio_scsi_complete_cmd_req(req);
|
|
object_unref(OBJECT(d));
|
|
return -ENOBUFS;
|
|
}
|
|
scsi_req_ref(req->sreq);
|
|
blk_io_plug(d->conf.blk);
|
|
object_unref(OBJECT(d));
|
|
return 0;
|
|
}
|
|
|
|
static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req)
|
|
{
|
|
SCSIRequest *sreq = req->sreq;
|
|
if (scsi_req_enqueue(sreq)) {
|
|
scsi_req_continue(sreq);
|
|
}
|
|
blk_io_unplug(sreq->dev->conf.blk);
|
|
scsi_req_unref(sreq);
|
|
}
|
|
|
|
bool virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq)
|
|
{
|
|
VirtIOSCSIReq *req, *next;
|
|
int ret = 0;
|
|
bool suppress_notifications = virtio_queue_get_notification(vq);
|
|
bool progress = false;
|
|
|
|
QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs);
|
|
|
|
do {
|
|
if (suppress_notifications) {
|
|
virtio_queue_set_notification(vq, 0);
|
|
}
|
|
|
|
while ((req = virtio_scsi_pop_req(s, vq))) {
|
|
progress = true;
|
|
ret = virtio_scsi_handle_cmd_req_prepare(s, req);
|
|
if (!ret) {
|
|
QTAILQ_INSERT_TAIL(&reqs, req, next);
|
|
} else if (ret == -EINVAL) {
|
|
/* The device is broken and shouldn't process any request */
|
|
while (!QTAILQ_EMPTY(&reqs)) {
|
|
req = QTAILQ_FIRST(&reqs);
|
|
QTAILQ_REMOVE(&reqs, req, next);
|
|
blk_io_unplug(req->sreq->dev->conf.blk);
|
|
scsi_req_unref(req->sreq);
|
|
virtqueue_detach_element(req->vq, &req->elem, 0);
|
|
virtio_scsi_free_req(req);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (suppress_notifications) {
|
|
virtio_queue_set_notification(vq, 1);
|
|
}
|
|
} while (ret != -EINVAL && !virtio_queue_empty(vq));
|
|
|
|
QTAILQ_FOREACH_SAFE(req, &reqs, next, next) {
|
|
virtio_scsi_handle_cmd_req_submit(s, req);
|
|
}
|
|
return progress;
|
|
}
|
|
|
|
static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
/* use non-QOM casts in the data path */
|
|
VirtIOSCSI *s = (VirtIOSCSI *)vdev;
|
|
|
|
if (s->ctx) {
|
|
virtio_device_start_ioeventfd(vdev);
|
|
if (!s->dataplane_fenced) {
|
|
return;
|
|
}
|
|
}
|
|
virtio_scsi_acquire(s);
|
|
virtio_scsi_handle_cmd_vq(s, vq);
|
|
virtio_scsi_release(s);
|
|
}
|
|
|
|
static void virtio_scsi_get_config(VirtIODevice *vdev,
|
|
uint8_t *config)
|
|
{
|
|
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
|
|
VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev);
|
|
|
|
virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues);
|
|
virtio_stl_p(vdev, &scsiconf->seg_max,
|
|
s->conf.seg_max_adjust ? s->conf.virtqueue_size - 2 : 128 - 2);
|
|
virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors);
|
|
virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun);
|
|
virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
|
|
virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size);
|
|
virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size);
|
|
virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
|
|
virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
|
|
virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
|
|
}
|
|
|
|
static void virtio_scsi_set_config(VirtIODevice *vdev,
|
|
const uint8_t *config)
|
|
{
|
|
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
|
|
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
|
|
|
|
if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 ||
|
|
(uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) {
|
|
virtio_error(vdev,
|
|
"bad data written to virtio-scsi configuration space");
|
|
return;
|
|
}
|
|
|
|
vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size);
|
|
vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size);
|
|
}
|
|
|
|
static uint64_t virtio_scsi_get_features(VirtIODevice *vdev,
|
|
uint64_t requested_features,
|
|
Error **errp)
|
|
{
|
|
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
|
|
|
|
/* Firstly sync all virtio-scsi possible supported features */
|
|
requested_features |= s->host_features;
|
|
return requested_features;
|
|
}
|
|
|
|
static void virtio_scsi_reset(VirtIODevice *vdev)
|
|
{
|
|
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
|
|
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
|
|
|
|
assert(!s->dataplane_started);
|
|
s->resetting++;
|
|
qbus_reset_all(BUS(&s->bus));
|
|
s->resetting--;
|
|
|
|
vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE;
|
|
vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE;
|
|
s->events_dropped = false;
|
|
}
|
|
|
|
void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
|
|
uint32_t event, uint32_t reason)
|
|
{
|
|
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
|
|
VirtIOSCSIReq *req;
|
|
VirtIOSCSIEvent *evt;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
|
return;
|
|
}
|
|
|
|
req = virtio_scsi_pop_req(s, vs->event_vq);
|
|
if (!req) {
|
|
s->events_dropped = true;
|
|
return;
|
|
}
|
|
|
|
if (s->events_dropped) {
|
|
event |= VIRTIO_SCSI_T_EVENTS_MISSED;
|
|
s->events_dropped = false;
|
|
}
|
|
|
|
if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) {
|
|
virtio_scsi_bad_req(req);
|
|
return;
|
|
}
|
|
|
|
evt = &req->resp.event;
|
|
memset(evt, 0, sizeof(VirtIOSCSIEvent));
|
|
evt->event = virtio_tswap32(vdev, event);
|
|
evt->reason = virtio_tswap32(vdev, reason);
|
|
if (!dev) {
|
|
assert(event == VIRTIO_SCSI_T_EVENTS_MISSED);
|
|
} else {
|
|
evt->lun[0] = 1;
|
|
evt->lun[1] = dev->id;
|
|
|
|
/* Linux wants us to keep the same encoding we use for REPORT LUNS. */
|
|
if (dev->lun >= 256) {
|
|
evt->lun[2] = (dev->lun >> 8) | 0x40;
|
|
}
|
|
evt->lun[3] = dev->lun & 0xFF;
|
|
}
|
|
virtio_scsi_complete_req(req);
|
|
}
|
|
|
|
bool virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq)
|
|
{
|
|
if (s->events_dropped) {
|
|
virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
|
|
|
|
if (s->ctx) {
|
|
virtio_device_start_ioeventfd(vdev);
|
|
if (!s->dataplane_fenced) {
|
|
return;
|
|
}
|
|
}
|
|
virtio_scsi_acquire(s);
|
|
virtio_scsi_handle_event_vq(s, vq);
|
|
virtio_scsi_release(s);
|
|
}
|
|
|
|
static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
|
|
{
|
|
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) &&
|
|
dev->type != TYPE_ROM) {
|
|
virtio_scsi_acquire(s);
|
|
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE,
|
|
sense.asc | (sense.ascq << 8));
|
|
virtio_scsi_release(s);
|
|
}
|
|
}
|
|
|
|
static void virtio_scsi_pre_hotplug(HotplugHandler *hotplug_dev,
|
|
DeviceState *dev, Error **errp)
|
|
{
|
|
SCSIDevice *sd = SCSI_DEVICE(dev);
|
|
sd->hba_supports_iothread = true;
|
|
}
|
|
|
|
static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
|
|
Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev);
|
|
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
|
|
SCSIDevice *sd = SCSI_DEVICE(dev);
|
|
int ret;
|
|
|
|
if (s->ctx && !s->dataplane_fenced) {
|
|
if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
|
|
return;
|
|
}
|
|
virtio_scsi_acquire(s);
|
|
ret = blk_set_aio_context(sd->conf.blk, s->ctx, errp);
|
|
virtio_scsi_release(s);
|
|
if (ret < 0) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
|
|
virtio_scsi_acquire(s);
|
|
virtio_scsi_push_event(s, sd,
|
|
VIRTIO_SCSI_T_TRANSPORT_RESET,
|
|
VIRTIO_SCSI_EVT_RESET_RESCAN);
|
|
virtio_scsi_release(s);
|
|
}
|
|
}
|
|
|
|
static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev,
|
|
Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev);
|
|
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
|
|
SCSIDevice *sd = SCSI_DEVICE(dev);
|
|
AioContext *ctx = s->ctx ?: qemu_get_aio_context();
|
|
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
|
|
virtio_scsi_acquire(s);
|
|
virtio_scsi_push_event(s, sd,
|
|
VIRTIO_SCSI_T_TRANSPORT_RESET,
|
|
VIRTIO_SCSI_EVT_RESET_REMOVED);
|
|
virtio_scsi_release(s);
|
|
}
|
|
|
|
aio_disable_external(ctx);
|
|
qdev_simple_device_unplug_cb(hotplug_dev, dev, errp);
|
|
aio_enable_external(ctx);
|
|
|
|
if (s->ctx) {
|
|
virtio_scsi_acquire(s);
|
|
/* If other users keep the BlockBackend in the iothread, that's ok */
|
|
blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL);
|
|
virtio_scsi_release(s);
|
|
}
|
|
}
|
|
|
|
static struct SCSIBusInfo virtio_scsi_scsi_info = {
|
|
.tcq = true,
|
|
.max_channel = VIRTIO_SCSI_MAX_CHANNEL,
|
|
.max_target = VIRTIO_SCSI_MAX_TARGET,
|
|
.max_lun = VIRTIO_SCSI_MAX_LUN,
|
|
|
|
.complete = virtio_scsi_command_complete,
|
|
.cancel = virtio_scsi_request_cancelled,
|
|
.change = virtio_scsi_change,
|
|
.parse_cdb = virtio_scsi_parse_cdb,
|
|
.get_sg_list = virtio_scsi_get_sg_list,
|
|
.save_request = virtio_scsi_save_request,
|
|
.load_request = virtio_scsi_load_request,
|
|
};
|
|
|
|
void virtio_scsi_common_realize(DeviceState *dev,
|
|
VirtIOHandleOutput ctrl,
|
|
VirtIOHandleOutput evt,
|
|
VirtIOHandleOutput cmd,
|
|
Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev);
|
|
int i;
|
|
|
|
virtio_init(vdev, "virtio-scsi", VIRTIO_ID_SCSI,
|
|
sizeof(VirtIOSCSIConfig));
|
|
|
|
if (s->conf.num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
|
|
s->conf.num_queues = 1;
|
|
}
|
|
if (s->conf.num_queues == 0 ||
|
|
s->conf.num_queues > VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED) {
|
|
error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
|
|
"must be a positive integer less than %d.",
|
|
s->conf.num_queues,
|
|
VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED);
|
|
virtio_cleanup(vdev);
|
|
return;
|
|
}
|
|
if (s->conf.virtqueue_size <= 2) {
|
|
error_setg(errp, "invalid virtqueue_size property (= %" PRIu32 "), "
|
|
"must be > 2", s->conf.virtqueue_size);
|
|
return;
|
|
}
|
|
s->cmd_vqs = g_new0(VirtQueue *, s->conf.num_queues);
|
|
s->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE;
|
|
s->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE;
|
|
|
|
s->ctrl_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, ctrl);
|
|
s->event_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, evt);
|
|
for (i = 0; i < s->conf.num_queues; i++) {
|
|
s->cmd_vqs[i] = virtio_add_queue(vdev, s->conf.virtqueue_size, cmd);
|
|
}
|
|
}
|
|
|
|
static void virtio_scsi_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOSCSI *s = VIRTIO_SCSI(dev);
|
|
Error *err = NULL;
|
|
|
|
virtio_scsi_common_realize(dev,
|
|
virtio_scsi_handle_ctrl,
|
|
virtio_scsi_handle_event,
|
|
virtio_scsi_handle_cmd,
|
|
&err);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
|
|
scsi_bus_new(&s->bus, sizeof(s->bus), dev,
|
|
&virtio_scsi_scsi_info, vdev->bus_name);
|
|
/* override default SCSI bus hotplug-handler, with virtio-scsi's one */
|
|
qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev));
|
|
|
|
virtio_scsi_dataplane_setup(s, errp);
|
|
}
|
|
|
|
void virtio_scsi_common_unrealize(DeviceState *dev)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
|
|
int i;
|
|
|
|
virtio_delete_queue(vs->ctrl_vq);
|
|
virtio_delete_queue(vs->event_vq);
|
|
for (i = 0; i < vs->conf.num_queues; i++) {
|
|
virtio_delete_queue(vs->cmd_vqs[i]);
|
|
}
|
|
g_free(vs->cmd_vqs);
|
|
virtio_cleanup(vdev);
|
|
}
|
|
|
|
static void virtio_scsi_device_unrealize(DeviceState *dev)
|
|
{
|
|
VirtIOSCSI *s = VIRTIO_SCSI(dev);
|
|
|
|
qbus_set_hotplug_handler(BUS(&s->bus), NULL);
|
|
virtio_scsi_common_unrealize(dev);
|
|
}
|
|
|
|
static Property virtio_scsi_properties[] = {
|
|
DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues,
|
|
VIRTIO_SCSI_AUTO_NUM_QUEUES),
|
|
DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI,
|
|
parent_obj.conf.virtqueue_size, 256),
|
|
DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI,
|
|
parent_obj.conf.seg_max_adjust, true),
|
|
DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI, parent_obj.conf.max_sectors,
|
|
0xFFFF),
|
|
DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI, parent_obj.conf.cmd_per_lun,
|
|
128),
|
|
DEFINE_PROP_BIT("hotplug", VirtIOSCSI, host_features,
|
|
VIRTIO_SCSI_F_HOTPLUG, true),
|
|
DEFINE_PROP_BIT("param_change", VirtIOSCSI, host_features,
|
|
VIRTIO_SCSI_F_CHANGE, true),
|
|
DEFINE_PROP_LINK("iothread", VirtIOSCSI, parent_obj.conf.iothread,
|
|
TYPE_IOTHREAD, IOThread *),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio_scsi = {
|
|
.name = "virtio-scsi",
|
|
.minimum_version_id = 1,
|
|
.version_id = 1,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_VIRTIO_DEVICE,
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
static void virtio_scsi_common_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
vdc->get_config = virtio_scsi_get_config;
|
|
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
|
|
}
|
|
|
|
static void virtio_scsi_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
|
|
|
|
device_class_set_props(dc, virtio_scsi_properties);
|
|
dc->vmsd = &vmstate_virtio_scsi;
|
|
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
|
|
vdc->realize = virtio_scsi_device_realize;
|
|
vdc->unrealize = virtio_scsi_device_unrealize;
|
|
vdc->set_config = virtio_scsi_set_config;
|
|
vdc->get_features = virtio_scsi_get_features;
|
|
vdc->reset = virtio_scsi_reset;
|
|
vdc->start_ioeventfd = virtio_scsi_dataplane_start;
|
|
vdc->stop_ioeventfd = virtio_scsi_dataplane_stop;
|
|
hc->pre_plug = virtio_scsi_pre_hotplug;
|
|
hc->plug = virtio_scsi_hotplug;
|
|
hc->unplug = virtio_scsi_hotunplug;
|
|
}
|
|
|
|
static const TypeInfo virtio_scsi_common_info = {
|
|
.name = TYPE_VIRTIO_SCSI_COMMON,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(VirtIOSCSICommon),
|
|
.abstract = true,
|
|
.class_init = virtio_scsi_common_class_init,
|
|
};
|
|
|
|
static const TypeInfo virtio_scsi_info = {
|
|
.name = TYPE_VIRTIO_SCSI,
|
|
.parent = TYPE_VIRTIO_SCSI_COMMON,
|
|
.instance_size = sizeof(VirtIOSCSI),
|
|
.class_init = virtio_scsi_class_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ TYPE_HOTPLUG_HANDLER },
|
|
{ }
|
|
}
|
|
};
|
|
|
|
static void virtio_register_types(void)
|
|
{
|
|
type_register_static(&virtio_scsi_common_info);
|
|
type_register_static(&virtio_scsi_info);
|
|
}
|
|
|
|
type_init(virtio_register_types)
|