Re: [Qemu-devel] Regression opening read-only cdroms

[Anthony Liguori]

Jamie Lokier wrote:
> > Indeed.
> > I have a patch that adds bdrv_set_read_only that set bs->read_only = 1
> > so that bdrv_open2 can check if the flag is set and act accordingly.
> > The problem is that in xen we read whether the device should be opened
> > read only in the VM config file, I don't think the user can specify to
> > open a drive read-only in qemu.
> >     
>
> What's missing is a "ro" sub-option to "-drive".
>   

It only is useful if we can expose that read-only attribute to the 
guest.  You can't do that consistently with all block devices so the 
result would be that you'll fail write operations causing a guest to crash.

This is not friendly to a user who expects that ro would Just Work.

Regards,

Anthony Liguori

> -- Jamie
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