linux-kernel - ToDo: backport to v3.4 , v3.3 , v3.2 patches 1b) db63a4c8115a libata 1) cd006086fa5d ata_piix: defer disks to the Hyper-V drivers by default Fw: use hv_storvsc instead of ata_piix for IDE disks ( but not for the CD-ROM)

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Message-ID: <B06F99AAB8B64125808F01FCDD1F9909@local.st.by>
Date:	Tue, 5 Jun 2012 09:50:16 +0300
From:	"Victor Miasnikov" <vvm@....by>
To:	"Jonathan Nieder" <jrnieder@...il.com>,
	"Greg KH" <gregkh@...uxfoundation.org>
Cc:	"KY Srinivasan" <kys@...rosoft.com>, <stable@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	"Mike Sterling" <Mike.Sterling@...rosoft.com>
Subject: ToDo: backport to v3.4 , v3.3 , v3.2 patches 1b) db63a4c8115a libata 1) cd006086fa5d ata_piix: defer disks to the Hyper-V drivers by default Fw: use hv_storvsc instead of ata_piix for IDE disks ( but not for the CD-ROM)

Hi!


>>> use hv_storvsc instead of ata_piix to handle the IDE disks devices ( but not for the CD-ROM)

J.N.> the problem is that ata_piix and hv_storvscboth claim the (virtual) hard disk.  

 Yes:
{  About bug fixed by patches:

>>  see tranlate from Russian language issue described by Maksim Kramarenko:
>> http://lists.debian.org/debian-russian/2012/01/msg00324.html

>>> After [VVM: turn On in kernel source]  Hyper-V modules [compile and
>>> start use], a hard disk was determined as 2 with the same UUID.

}

J.N.> {
A workaround is to blacklist the ata_piix module.  
However, that means losing access to CD and DVD drives 
which are exposed by ata_piix and not hv_storvsc.
}

 Yes: work without CD-ROM is not super-fine, 
{
best backport patches from v3.5 ( de-facto reincarnation _tested_(!) patches from Ubuntu v12.04 and/or OpenSUSE ) :

J.N.> {
 The patch works by making ata_piix skip the disk during enumeration 
if hv_storvsc is enabled as a built-in driver or module.
 }

>> > VVM > > > Hyper-V admins need _worked_ Linux v3.4.X / v3.3.X / v3.2.X

  i.e. need backport to all actual version after 3.1

  cd006086fa5d ata_piix: defer disks to the Hyper-V drivers by default

and its prerequisite

  db63a4c8115a libata: add a host flag to ignore detected ATA devices

}


> --- I think this is what Greg was asking for.

 I supose . . .

 Thanks,
Best regards, Victor Miasnikov
Blog:  http://vvm.blog.tut.by/

P.S.

> Thanks

 No problem :-)

> Hoping that clarifies,

 Yes: very good description of problem and possible solution
Big thanks!

--


----- Original Message ----- 
From: "Jonathan Nieder" 
To: . . . Cc:  . . .
Sent: Tuesday, June 05, 2012 7:59 AM
Subject: Re: [PATCH 2/2] ata_piix: defer disks to the Hyper-V drivers by default

  . . . 

If I understand correctly, 
the problem is that ata_piix and hv_storvscboth claim the (virtual) hard disk.  
That sounds worth fixing.  
The patch works by making ata_piix skip the disk during enumeration 
if hv_storvsc is enabled as a built-in driver or module.

A workaround is to blacklist the ata_piix module.  
However, that means losing access to CD and DVD drives 
which are exposed by ata_piix and not hv_storvsc.
--


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