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SubjectRE: [PATCH 08/25] Staging: hv: vmbus_driver cannot be unloaded; cleanup accordingly
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> -----Original Message-----
> From: Greg KH [mailto:greg@kroah.com]
> Sent: Tuesday, April 26, 2011 6:46 PM
> To: KY Srinivasan
> Cc: gregkh@suse.de; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; virtualization@lists.osdl.org; Haiyang Zhang;
> Abhishek Kane (Mindtree Consulting PVT LTD)
> Subject: Re: [PATCH 08/25] Staging: hv: vmbus_driver cannot be unloaded;
> cleanup accordingly
>
> On Tue, Apr 26, 2011 at 09:20:25AM -0700, K. Y. Srinivasan wrote:
> > The vmbus driver cannot be unloaded; the windows host does not
> > permit this. Cleanup accordingly.
>
> Woah, you just prevented this driver from ever being able to be
> unloaded.

It was never unloadable; while the driver defined an exit routine,
there were couple of issues unloading the vmbus driver:

1) All guest resources given to the host could not be recovered.

2) Windows host would not permit reloading the driver without
rebooting the guest.

All I did was acknowledge the current state and cleanup
accordingly. This is not unique to Hyper-V; for what it is worth,
the Xen platform_pci driver which is equivalent to the vmbus driver
is also not unlodable (the last time I checked).

>
> That's not a "cleanup" that's a major change in how things work. I'm
> sure, if you want to continue down this line, there are more things you
> can remove from the code, right?
>
> What is the real issue here? What happens if you unload the bus? What
> goes wrong? Can it be fixed?

This needs to be fixed on the host side. I have notified them of the issue.

>
> This is a pretty big commitment...

These drivers only load when Linux is hosted on a Hyper-V platform;
I am not sure why it is a "big commitment" given that the host does not
permit reloading this driver without rebooting the guest.

Regards,

K. Y



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