Re: [Qemu-devel] [Bug 1383857] Re: aarch64: virtio-scsi disks don't show up in guest

[Peter Maydell]

On 21 October 2014 22:15, Richard Jones <address@hidden> wrote:
> I have now also tried virtio-blk and that doesn't work either.  Same
> symptoms: no log messages at all (even with ignore_loglevel), and no
> disks appear.
>
>> Yeah, "regressed with this newer kernel" sounds more like a kernel
>> bug than a QEMU bug to me, especially if all the other virt devices
>> still work.
>
> It seems like no virtio drivers work, but it's very hard to tell when
> your guest has no disks and therefore no operating system.  How can I
> debug this further?

Oh. I assumed from the fact your commandline had other virtio
devices and you were only complaining about virtio-scsi that it
was a single-backend issue.

Suggestions:
 * bisect the kernel to find out when it broke
 * add a bunch of debug printks to the kernel to find out why
   it's not finding the disks. The logging here is terrible IMHO:
   the kernel usually detects a specific problem and then throws
   all this info away in favour of just silently deciding there's
   no hardware there

thanks
-- PMM