Re: [Qemu-block] [Qemu-devel] [PATCH] block.c: fix real cdrom detection

[Peter Maydell]

On 25 June 2015 at 18:56, Programmingkid <address@hidden> wrote:
> Nice to hear from you again Laurent. The only way a solution in
> hdev_open() would work is if it could prevent find_image_format()
> from executing. Otherwise find_image_format() would just quit QEMU
> with an error.

The question you should be asking is "what is Linux doing for
raw CDROM devices that is different, such that it works there
but doesn't work on OSX?".

It would also be helpful to know which is the case that doesn't
work. Does QEMU fail in all cases, or only if the cdrom drive is
empty, or only if there's a disk in the drive?

My initial suspicion is that we need OSX support in raw-posix.c
for handling the host CDROM specially -- note that Linux and
FreeBSD register a bdrv_host_cdrom with an is_inserted
function.

thanks
-- PMM