Re: [Qemu-devel] [PATCH v2 3/3] raw-posix: Re-open host CD-ROM after media change

[Avi Kivity]

On 04/05/2011 11:09 AM, Amit Shah wrote:
> On (Tue) 05 Apr 2011 [10:48:16], Avi Kivity wrote:
> >  On 04/05/2011 09:41 AM, Amit Shah wrote:
> >  >See http://www.spinics.net/lists/linux-scsi/msg51504.html
> >
> >  I see this is quite fresh.  What are the plans here?
>
> We're still discussing where the fix should be, but it certainly is a
> kernel bug and should be fixed there, and then applied to stable.
>
> However, there are other bugs in qemu which will prevent the right
> size changes to be visible in the guest (the RFC series I sent out
> earlier in this thread need to be applied to QEMU at the least, the
> series has grown in my development tree since the time I sent that one
> out).  So essentially we need to update both, the hypervisor and the
> guest to get proper CDROM media change support.

Why do we need to update the guest for a qemu bug?  What is the qemu bug?

> It also looks like we can't have a workaround in QEMU to get older
> guests to work.

Older guests?  or older hosts?

> However, a hack in the kernel can be used without any QEMU changes
> (revalidate disk on each sr_open() call, irrespective of detecting any
> media change).  I'm against doing that for upstream, but downstreams
> could do that for new guest - old hypervisor compat.

Seriously confused.  Please use the kernels "host kernel" and "qemu" 
instead of "hypervisor" which is ambiguous.

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