On Tue, Nov 17, 2020 at 11:36:36AM +0000, Stefan Hajnoczi wrote:
On Fri, Nov 13, 2020 at 02:47:12PM +0100, Stefano Garzarella wrote:
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
index 8e41b3ab98d5..68e74383322f 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
@@ -7,6 +7,7 @@
*/
#include <linux/module.h>
+#include <linux/blkdev.h>
#include <uapi/linux/virtio_blk.h>
#include "vdpa_sim.h"
@@ -24,10 +25,137 @@
static struct vdpasim *vdpasim_blk_dev;
+static int vdpasim_blk_handle_req(struct vdpasim *vdpasim,
+ struct vdpasim_virtqueue *vq)
This function has a non-standard int return value. Please document it.
Yes, I'll do.
+{
+ size_t wrote = 0, to_read = 0, to_write = 0;
+ struct virtio_blk_outhdr hdr;
+ uint8_t status;
+ uint32_t type;
+ ssize_t bytes;
+ loff_t offset;
+ int i, ret;
+
+ vringh_kiov_cleanup(&vq->riov);
+ vringh_kiov_cleanup(&vq->wiov);
+
+ ret = vringh_getdesc_iotlb(&vq->vring, &vq->riov, &vq->wiov,
+ &vq->head, GFP_ATOMIC);
+ if (ret != 1)
+ return ret;
+
+ for (i = 0; i < vq->wiov.used; i++)
+ to_write += vq->wiov.iov[i].iov_len;
+ to_write -= 1; /* last byte is the status */
What if vq->wiov.used == 0?
Right, we should discard the descriptor.
+
+ for (i = 0; i < vq->riov.used; i++)
+ to_read += vq->riov.iov[i].iov_len;
+
+ bytes = vringh_iov_pull_iotlb(&vq->vring, &vq->riov, &hdr, sizeof(hdr));
+ if (bytes != sizeof(hdr))
+ return 0;
+
+ to_read -= bytes;
+
+ type = le32_to_cpu(hdr.type);
+ offset = le64_to_cpu(hdr.sector) << SECTOR_SHIFT;
+ status = VIRTIO_BLK_S_OK;
+
+ switch (type) {
+ case VIRTIO_BLK_T_IN:
+ if (offset + to_write > VDPASIM_BLK_CAPACITY << SECTOR_SHIFT) {
Integer overflow is not handled.
I'll fix.
Thanks,
Stefano
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