linux-kernel - Re:RE: [PATCH 08/25] Staging: hv: vmbus_driver cannot be unloaded; cleanup accordingly

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Date:	Wed, 27 Apr 2011 12:55:19 +0800 (CST)
From:	uabuntsu@...e.com
To:	"KY Srinivasan" <kys@...rosoft.com>
Cc:	"Greg KH" <greg@...ah.com>, "gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>,
	"Haiyang Zhang" <haiyangz@...rosoft.com>,
	"Abhishek Kane (Mindtree Consulting PVT LTD)" 
	<v-abkane@...rosoft.com>
Subject: Re:RE: [PATCH 08/25] Staging: hv: vmbus_driver cannot be unloaded;
 cleanup accordingly

unsubscribe linux-kernel
At 2011-04-27 10:31:18，"KY Srinivasan" <kys@...rosoft.com> wrote:
>
>
>> -----Original Message-----
>> From: Greg KH [mailto:greg@...ah.com]
>> Sent: Tuesday, April 26, 2011 6:46 PM
>> To: KY Srinivasan
>> Cc: gregkh@...e.de; linux-kernel@...r.kernel.org;
>> devel@...uxdriverproject.org; virtualization@...ts.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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