Re: [PATCH for-9.0?] usb-storage: Fix BlockConf defaults

[Peter Maydell]

On Tue, 16 Apr 2024 at 10:26, Hanna Czenczek <hreitz@redhat.com> wrote:
>
> On 12.04.24 16:42, Kevin Wolf wrote:
> > Commit 30896374 started to pass the full BlockConf from usb-storage to
> > scsi-disk, while previously only a few select properties would be
> > forwarded. This enables the user to set more properties, e.g. the block
> > size, that are actually taking effect.
> >
> > However, now the calls to blkconf_apply_backend_options() and
> > blkconf_blocksizes() in usb_msd_storage_realize() that modify some of
> > these properties take effect, too, instead of being silently ignored.
> > This means at least that the block sizes get an unconditional default of
> > 512 bytes before the configuration is passed to scsi-disk.
> >
> > Before commit 30896374, the property wouldn't be set for scsi-disk and
> > therefore the device dependent defaults would apply - 512 for scsi-hd,
> > but 2048 for scsi-cd. The latter default has now become 512, too, which
> > makes at least Windows 11 installation fail when installing from
> > usb-storage.
> >
> > Fix this by simply not calling these functions any more in usb-storage
> > and passing BlockConf on unmodified (except for the BlockBackend). The
> > same functions are called by the SCSI code anyway and it sets the right
> > defaults for the actual media type.
> >
> > Fixes: 308963746169 ('scsi: Don't ignore most usb-storage properties')
> > Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2260
> > Reported-by: Jonas Svensson
> > Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> > ---
> > Considering this a candidate for 9.0 given that we're already having an
> > rc4, it's a regression from 8.2 and breaks installing Windows from USB
> >
> >   hw/usb/dev-storage-classic.c | 9 ---------
> >   1 file changed, 9 deletions(-)
>
> Reviewed-by: Hanna Czenczek <hreitz@redhat.com>

Thanks; I've now applied this to git directly (following
discussion with Kevin on IRC.)

-- PMM