virtio-blk: remove SCSI passthrough functionality
The legacy SCSI passthrough functionality has never been enabled for
VIRTIO 1.0 and was deprecated more than four years ago.
Get rid of it---almost, because QEMU is advertising it unconditionally
for legacy virtio-blk devices. Just parse the header and return a
nonzero status.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 40585ca..4980d72 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -296,16 +296,6 @@
Emulated device options
'''''''''''''''''''''''
-``-device virtio-blk,scsi=on|off`` (since 5.0)
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-The virtio-blk SCSI passthrough feature is a legacy VIRTIO feature. VIRTIO 1.0
-and later do not support it because the virtio-scsi device was introduced for
-full SCSI support. Use virtio-scsi instead when SCSI passthrough is required.
-
-Note this also applies to ``-device virtio-blk-pci,scsi=on|off``, which is an
-alias.
-
``-device nvme-ns,eui64-default=on|off`` (since 7.1)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/docs/about/removed-features.rst b/docs/about/removed-features.rst
index fba0cfb..ae6269e 100644
--- a/docs/about/removed-features.rst
+++ b/docs/about/removed-features.rst
@@ -510,6 +510,14 @@
Removed along with the ``compression`` migration capability.
+``-device virtio-blk,scsi=on|off`` (since 9.1)
+''''''''''''''''''''''''''''''''''''''''''''''
+
+The virtio-blk SCSI passthrough feature is a legacy VIRTIO feature. VIRTIO 1.0
+and later do not support it because the virtio-scsi device was introduced for
+full SCSI support. Use virtio-scsi instead when SCSI passthrough is required.
+
+
User-mode emulator command line arguments
-----------------------------------------
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index bb86e65..73bdfd6 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -172,57 +172,6 @@
virtio_blk_free_request(req);
}
-#ifdef __linux__
-
-typedef struct {
- VirtIOBlockReq *req;
- struct sg_io_hdr hdr;
-} VirtIOBlockIoctlReq;
-
-static void virtio_blk_ioctl_complete(void *opaque, int status)
-{
- VirtIOBlockIoctlReq *ioctl_req = opaque;
- VirtIOBlockReq *req = ioctl_req->req;
- VirtIOBlock *s = req->dev;
- VirtIODevice *vdev = VIRTIO_DEVICE(s);
- struct virtio_scsi_inhdr *scsi;
- struct sg_io_hdr *hdr;
-
- scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base;
-
- if (status) {
- status = VIRTIO_BLK_S_UNSUPP;
- virtio_stl_p(vdev, &scsi->errors, 255);
- goto out;
- }
-
- hdr = &ioctl_req->hdr;
- /*
- * From SCSI-Generic-HOWTO: "Some lower level drivers (e.g. ide-scsi)
- * clear the masked_status field [hence status gets cleared too, see
- * block/scsi_ioctl.c] even when a CHECK_CONDITION or COMMAND_TERMINATED
- * status has occurred. However they do set DRIVER_SENSE in driver_status
- * field. Also a (sb_len_wr > 0) indicates there is a sense buffer.
- */
- if (hdr->status == 0 && hdr->sb_len_wr > 0) {
- hdr->status = CHECK_CONDITION;
- }
-
- virtio_stl_p(vdev, &scsi->errors,
- hdr->status | (hdr->msg_status << 8) |
- (hdr->host_status << 16) | (hdr->driver_status << 24));
- virtio_stl_p(vdev, &scsi->residual, hdr->resid);
- virtio_stl_p(vdev, &scsi->sense_len, hdr->sb_len_wr);
- virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len);
-
-out:
- virtio_blk_req_complete(req, status);
- virtio_blk_free_request(req);
- g_free(ioctl_req);
-}
-
-#endif
-
static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq)
{
VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq));
@@ -233,20 +182,14 @@
return req;
}
-static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
+static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
{
- int status = VIRTIO_BLK_S_OK;
- struct virtio_scsi_inhdr *scsi = NULL;
+ int status;
+ struct virtio_scsi_inhdr *scsi;
VirtIOBlock *blk = req->dev;
VirtIODevice *vdev = VIRTIO_DEVICE(blk);
VirtQueueElement *elem = &req->elem;
-#ifdef __linux__
- int i;
- VirtIOBlockIoctlReq *ioctl_req;
- BlockAIOCB *acb;
-#endif
-
/*
* We require at least one output segment each for the virtio_blk_outhdr
* and the SCSI command block.
@@ -262,95 +205,16 @@
/*
* The scsi inhdr is placed in the second-to-last input segment, just
* before the regular inhdr.
+ *
+ * Just put anything nonzero so that the ioctl fails in the guest.
*/
scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base;
-
- if (!virtio_has_feature(blk->host_features, VIRTIO_BLK_F_SCSI)) {
- status = VIRTIO_BLK_S_UNSUPP;
- goto fail;
- }
-
- /*
- * No support for bidirection commands yet.
- */
- if (elem->out_num > 2 && elem->in_num > 3) {
- status = VIRTIO_BLK_S_UNSUPP;
- goto fail;
- }
-
-#ifdef __linux__
- ioctl_req = g_new0(VirtIOBlockIoctlReq, 1);
- ioctl_req->req = req;
- ioctl_req->hdr.interface_id = 'S';
- ioctl_req->hdr.cmd_len = elem->out_sg[1].iov_len;
- ioctl_req->hdr.cmdp = elem->out_sg[1].iov_base;
- ioctl_req->hdr.dxfer_len = 0;
-
- if (elem->out_num > 2) {
- /*
- * If there are more than the minimally required 2 output segments
- * there is write payload starting from the third iovec.
- */
- ioctl_req->hdr.dxfer_direction = SG_DXFER_TO_DEV;
- ioctl_req->hdr.iovec_count = elem->out_num - 2;
-
- for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
- ioctl_req->hdr.dxfer_len += elem->out_sg[i + 2].iov_len;
- }
-
- ioctl_req->hdr.dxferp = elem->out_sg + 2;
-
- } else if (elem->in_num > 3) {
- /*
- * If we have more than 3 input segments the guest wants to actually
- * read data.
- */
- ioctl_req->hdr.dxfer_direction = SG_DXFER_FROM_DEV;
- ioctl_req->hdr.iovec_count = elem->in_num - 3;
- for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
- ioctl_req->hdr.dxfer_len += elem->in_sg[i].iov_len;
- }
-
- ioctl_req->hdr.dxferp = elem->in_sg;
- } else {
- /*
- * Some SCSI commands don't actually transfer any data.
- */
- ioctl_req->hdr.dxfer_direction = SG_DXFER_NONE;
- }
-
- ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base;
- ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len;
-
- acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
- virtio_blk_ioctl_complete, ioctl_req);
- if (!acb) {
- g_free(ioctl_req);
- status = VIRTIO_BLK_S_UNSUPP;
- goto fail;
- }
- return -EINPROGRESS;
-#else
- abort();
-#endif
+ virtio_stl_p(vdev, &scsi->errors, 255);
+ status = VIRTIO_BLK_S_UNSUPP;
fail:
- /* Just put anything nonzero so that the ioctl fails in the guest. */
- if (scsi) {
- virtio_stl_p(vdev, &scsi->errors, 255);
- }
- return status;
-}
-
-static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
-{
- int status;
-
- status = virtio_blk_handle_scsi_req(req);
- if (status != -EINPROGRESS) {
- virtio_blk_req_complete(req, status);
- virtio_blk_free_request(req);
- }
+ virtio_blk_req_complete(req, status);
+ virtio_blk_free_request(req);
}
static inline void submit_requests(VirtIOBlock *s, MultiReqBuffer *mrb,
@@ -1379,13 +1243,9 @@
virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
- if (virtio_has_feature(features, VIRTIO_F_VERSION_1)) {
- if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_SCSI)) {
- error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0");
- return 0;
- }
- } else {
+ if (!virtio_has_feature(features, VIRTIO_F_VERSION_1)) {
virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT);
+ /* Added for historical reasons, removing it could break migration. */
virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
}
@@ -2132,10 +1992,6 @@
DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial),
DEFINE_PROP_BIT64("config-wce", VirtIOBlock, host_features,
VIRTIO_BLK_F_CONFIG_WCE, true),
-#ifdef __linux__
- DEFINE_PROP_BIT64("scsi", VirtIOBlock, host_features,
- VIRTIO_BLK_F_SCSI, false),
-#endif
DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0,
true),
DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues,
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 8087026..17292b1 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -265,8 +265,6 @@
const size_t hw_compat_2_5_len = G_N_ELEMENTS(hw_compat_2_5);
GlobalProperty hw_compat_2_4[] = {
- /* Optional because the 'scsi' property is Linux-only */
- { "virtio-blk-device", "scsi", "true", .optional = true },
{ "e1000", "extra_mac_registers", "off" },
{ "virtio-pci", "x-disable-pcie", "on" },
{ "virtio-pci", "migrate-extra", "off" },
