linux-kernel - Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

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Message-ID: <4F3A3017.4060202@redhat.com>
Date:	Tue, 14 Feb 2012 10:57:43 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	ronnie sahlberg <ronniesahlberg@...il.com>,
	Hannes Reinecke <hare@...e.de>, Dor Laor <dlaor@...hat.com>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Christian Hoff <christian.hoff@...ibm.com>,
	borntrae@...ux.vnet.ibm.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	rusty@...tcorp.com.au, Stefan Hajnoczi <stefanha@...il.com>,
	target-devel <target-devel@...r.kernel.org>
Subject: Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

On 02/14/2012 02:11 AM, Michael S. Tsirkin wrote:
> On Tue, Feb 14, 2012 at 11:49:55AM +1100, ronnie sahlberg wrote:
>> By just exposing this device to the kernel, the kernel keeps sending,
>> or if not the kernel maybe some other process trying to poll the
>> status?
>>
>> every few seconds :
>> PREVENT_ALLOW_MEDIUM_REMOVAL  prevent removal
>> PREVENT_ALLOW_MEDIUM_REMOVAL  to immediatel change it back to allow
>> removal again
>> TEST_UNIT_READY
>>
>>
>> After I run this
>> mount /dev/sdd1 /mnt
>>
>> The kernel sends a single
>> PREVENT_ALLOW_MEDIUM_REMOVAL to prevent removal
>> then every few seconds a
>> TEST_UNIT_READY

Sorry to interrupt you again guys, but: the discussion started with 
virtio-blk hotplug and now we're talking about SCSI commands?  Sure 
somebody switched topic at some point :) and anyway this is irrelevant 
to what virtio-blk can/cannot do.

BTW, for virtio-scsi the spec provides a way to do hotplug and hotunplug 
without any polling, though it's not implemented yet in the driver.

Paolo
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