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-rw-r--r--hw/block/virtio-blk.c125
1 files changed, 79 insertions, 46 deletions
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index 60cb1d88ed..4032fcae27 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -115,6 +115,56 @@ static void virtio_blk_flush_complete(void *opaque, int ret)
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;
+ VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
+ 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)
{
VirtIOBlockReq *req = virtio_blk_alloc_request(s);
@@ -137,7 +187,7 @@ static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
#ifdef __linux__
int i;
- struct sg_io_hdr hdr;
+ VirtIOBlockIoctlReq *ioctl_req;
#endif
/*
@@ -172,71 +222,52 @@ static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
}
#ifdef __linux__
- memset(&hdr, 0, sizeof(struct sg_io_hdr));
- hdr.interface_id = 'S';
- hdr.cmd_len = elem->out_sg[1].iov_len;
- hdr.cmdp = elem->out_sg[1].iov_base;
- hdr.dxfer_len = 0;
+ 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.
*/
- hdr.dxfer_direction = SG_DXFER_TO_DEV;
- hdr.iovec_count = elem->out_num - 2;
+ ioctl_req->hdr.dxfer_direction = SG_DXFER_TO_DEV;
+ ioctl_req->hdr.iovec_count = elem->out_num - 2;
- for (i = 0; i < hdr.iovec_count; i++)
- hdr.dxfer_len += elem->out_sg[i + 2].iov_len;
+ for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
+ ioctl_req->hdr.dxfer_len += elem->out_sg[i + 2].iov_len;
+ }
- hdr.dxferp = elem->out_sg + 2;
+ 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.
*/
- hdr.dxfer_direction = SG_DXFER_FROM_DEV;
- hdr.iovec_count = elem->in_num - 3;
- for (i = 0; i < hdr.iovec_count; i++)
- hdr.dxfer_len += elem->in_sg[i].iov_len;
+ 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;
+ }
- hdr.dxferp = elem->in_sg;
+ ioctl_req->hdr.dxferp = elem->in_sg;
} else {
/*
* Some SCSI commands don't actually transfer any data.
*/
- hdr.dxfer_direction = SG_DXFER_NONE;
+ ioctl_req->hdr.dxfer_direction = SG_DXFER_NONE;
}
- hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base;
- hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len;
-
- status = blk_ioctl(blk->blk, SG_IO, &hdr);
- if (status) {
- status = VIRTIO_BLK_S_UNSUPP;
- goto fail;
- }
+ 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;
- /*
- * 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);
-
- return status;
+ blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
+ virtio_blk_ioctl_complete, ioctl_req);
+ return -EINPROGRESS;
#else
abort();
#endif
@@ -254,8 +285,10 @@ static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
int status;
status = virtio_blk_handle_scsi_req(req);
- virtio_blk_req_complete(req, status);
- virtio_blk_free_request(req);
+ if (status != -EINPROGRESS) {
+ virtio_blk_req_complete(req, status);
+ virtio_blk_free_request(req);
+ }
}
void virtio_submit_multiwrite(BlockBackend *blk, MultiReqBuffer *mrb)
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-23 02:10:44 +0000