[Qemu-devel] [PATCH v3 2.1 0/4] Suppress error action on r/w beyond end

[Markus Armbruster]

When a device model's I/O operation fails, we execute the error
action.  This lets layers above QEMU implement thin provisioning, or
attempt to correct errors before they reach the guest.  But when the
I/O operation fails because its invalid, reporting the error to the
guest is the only sensible action.

SCSI does that, but virtio-blk and IDE don't.  Fix them.  No other
device model supports error actions.

v3:
* PATCH 2: Resolve semantic conflict with commit 671ec3f "virtio-blk:
  Convert VirtIOBlockReq.elem to pointer" [Kevin]
v2:
* PATCH 2: Commit message spelling fix [Fam]
* PATCH 4: New, covering IDE

Markus Armbruster (4):
  virtio-blk: Factor common checks out of virtio_blk_handle_read/write()
  virtio-blk: Bypass error action and I/O accounting on invalid r/w
  virtio-blk: Treat read/write beyond end as invalid
  ide: Treat read/write beyond end as invalid

 hw/block/virtio-blk.c | 45 +++++++++++++++++++++++++++++----------------
 hw/ide/core.c         | 28 ++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 16 deletions(-)

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1.9.3