Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

> > [REQUEST SENSE while blanking]
> > MMC-3 5.2 and MMC-5 6.2.3

> Is this git master or 0.15? 

It is a git clone obtained on November 2 by
  git clone git://git.qemu.org/qemu.git

I see a file VERSION with date Nov 2 13:41 (+0100)

  $ cat VERSION
  0.15.90

  $ git describe
  fatal: No annotated tags can describe 'e072ea2fd8fdceef64159b9596d3c15ce01bea91'.
  However, there were unannotated tags: try --tags.

  $ git describe --tags
  v1.0-rc0


Should i run
  git pull git://git.qemu.org/qemu.git
? (My clone is still slightly altered. Will this be a problem ?)


> This is because QEMU always emulates REQUEST SENSE and always returns the
> sense data from the last request.

Is this realistic enough for passthrough ?
Shouldn't qemu forward all SCSI commands to the host operating system
in this case ?


> REQUEST SENSE would be used if
> SG_IO reports CHECK CONDITION without SG_ERR_DRIVER_SENSE (but modern OSes
> will always emulate autosense even if the HBA does not support it) and
> possibly if TEST UNIT READY returns GOOD which is allowed by deprecated in
> MMC.

Up to now it appeared better to use the explicitely prescribed
method with REQUEST SENSE.
It is not a showstopper anyway. Just a little beauty flaw.
There are also some drives which do not report proper progress.

I have this topic on my todo list, together with a more graceful
handling if SET STREAMING fails.

Currently i am at the item
 - Test all libburn write models of CD, DVD, and BD.
   Write a summary of all results.

I plan to check DVD+R tonight. BD-R and BD-RE tomorrow.


Have a nice day :)

Thomas