On 9/15/23 00:19, Jeuk Kim wrote:
First, ufs-lu has a feature called "unit descriptor". This feature shows
the status of the ufs-lu
and only works with UFS-specific "query request" commands, not SCSI
commands.
This looks like something that can be implemented in the UFS subsystem.
UFS also has something called a well-known lu. Unlike typical SCSI
devices, where each lu is independent,
UFS can control other lu's through the well-known lu.
This can also be implemented in UfsBus.
Finally, UFS-LU will have features that SCSI-HD does not have, such as
the zone block command.
These should be implemented in scsi-hd as well.
In addition to this, I wanted some scsi commands to behave differently
from scsi-hd, for example,
the Inquiry command should read "QEMU UFS" instead of "QEMU HARDDISK",
and the mode_sense_page command should have a different result.
Some of these don't have much justification, and others (such as the
control page) could be done in scsi-hd as well.
We should look into cleaning this up and making ufs-lu share a lot more
code with scsi-hd; possibly even supporting -device scsi-hd with UFS
devices. I am not going to ask you for a revert, but if this is not
done before 8.2 is out, I will ask you to disable it by default in
hw/ufs/Kconfig.
In the future, please Cc the SCSI maintainers for UFS patches.
Paolo
