Message-ID: <4F3A3017.4060202@redhat.com>
Date: Tue, 14 Feb 2012 10:57:43 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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To: "Michael S. Tsirkin" <mst@redhat.com>
CC: ronnie sahlberg <ronniesahlberg@gmail.com>, Hannes Reinecke <hare@suse.de>,
        Dor Laor <dlaor@redhat.com>,
        "Nicholas A. Bellinger" <nab@linux-iscsi.org>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        James Bottomley <James.Bottomley@hansenpartnership.com>,
        Christian Hoff <christian.hoff@de.ibm.com>,
        borntrae@linux.vnet.ibm.com, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
        rusty@rustcorp.com.au, Stefan Hajnoczi <stefanha@gmail.com>,
        target-devel <target-devel@vger.kernel.org>
Subject: Re: Pe: [PATCH v5 1/3] virtio-scsi: first version
References: <20120213130005.GB26773@redhat.com> <CAN05THTOY894httm5PjzsHELBB-P8DmpZ4bGoBR7FH1s6Tmcrg@mail.gmail.com> <20120213131848.GD26773@redhat.com> <4F39287A.9030808@suse.de> <CAN05THT=7xJhqAMrAvDsK2Z1_4d+=tV9yhOFkr5Z-i43k5hAGA@mail.gmail.com> <CAN05THT6t_w=9Zt+o-B4s8E3jUMWsxiBvTyySxNEK2QfvLe-BA@mail.gmail.com> <20120213225623.GA2988@redhat.com> <CAN05THS_zTf2VRz6QdccHbkOacnE86LNhtxp7b8twe+XezBU6Q@mail.gmail.com> <20120213233334.GC4430@redhat.com> <CAN05THTTva709Dab9f_PBWxehMWnP9Gg4T7Nnmg7Swk3xuz7aQ@mail.gmail.com> <20120214011144.GB5192@redhat.com>
In-Reply-To: <20120214011144.GB5192@redhat.com>
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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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