Re: [PATCH] scsi-disk: support setting CD-ROM block size via device options.

[Mark Cave-Ayland]

On 01/08/2022 12:08, John Millikin wrote:

> Gentle ping -- this is my first time sending a patch for QEMU and it
> hasn't shown up in the qemu-devel mailing list web UI yet, so I can't
> tell whether the mail is being sent/received successfully.
>
> On Tue, Jul 26, 2022 at 12:42:06PM +0900, John Millikin wrote:
> > SunOS expects CD-ROM devices to have a block size of 512, and will
> > fail to mount or install using QEMU's default block size of 2048.
> >
> > When initializing the SCSI device, allow the `physical_block_device'
> > block device option to override the default block size.
> >
> > Signed-off-by: John Millikin <john@john-millikin.com>
> > ---
> >   hw/scsi/scsi-disk.c | 7 ++++++-
> >   1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
> > index f5cdb9ad4b..acdf8dc05c 100644
> > --- a/hw/scsi/scsi-disk.c
> > +++ b/hw/scsi/scsi-disk.c
> > @@ -2533,6 +2533,7 @@ static void scsi_cd_realize(SCSIDevice *dev, Error **errp)
> >       SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
> >       AioContext *ctx;
> >       int ret;
> > +    uint32_t blocksize = 2048;
> >   
> >       if (!dev->conf.blk) {
> >           /* Anonymous BlockBackend for an empty drive. As we put it into
> > @@ -2542,9 +2543,13 @@ static void scsi_cd_realize(SCSIDevice *dev, Error 
> > **errp)
> >           assert(ret == 0);
> >       }
> >   
> > +    if (dev->conf.physical_block_size != 0) {
> > +        blocksize = dev->conf.physical_block_size;
> > +    }
> > +
> >       ctx = blk_get_aio_context(dev->conf.blk);
> >       aio_context_acquire(ctx);
> > -    s->qdev.blocksize = 2048;
> > +    s->qdev.blocksize = blocksize;
> >       s->qdev.type = TYPE_ROM;
> >       s->features |= 1 << SCSI_DISK_F_REMOVABLE;
> >       if (!s->product) {
> > --
> > 2.25.1

Hi John,

I saw this reply but didn't see the original patch - were you subscribed to the list 
before you first sent it? If not, it may be that it got caught in a moderation queue 
somewhere.

The CC email addresses look right, but do bear in mind that people are busy as the 
7.1 release is just around the corner and so may not get to your patch right away.

The reason your patch caught my eye is that I've been having a similar discussion on 
Gitlab at https://gitlab.com/qemu-project/qemu/-/issues/1127. Could you check your 
git send-email configuration and then try and resend your patch to see if it appears 
on the list?


ATB,

Mark.