Re: [PATCH 2/2] ata_piix: defer disks to the Hyper-V drivers bydefault

From: Jonathan Nieder
Date: Tue Jun 05 2012 - 01:00:20 EST

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In reply to: Victor Miasnikov: "Re: Linux on Hyper-V 1) cd006086fa5d ata_piix: defer disks to the Hyper-V drivers by default 2) db63a4c8115a libata: add a host flag to ignore detected ATA device FW: use hv_storvsc instead of ata_piix to handle the IDE disks devices ( but not for the ..."
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Hi,

Victor Miasnikov wrote:

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

>> Correct, that is loaded without error, sleep and wake, for a small exception:
>>
>> At the conclusion of the system through the halt or when sending a
>> signal shutdown by ACPI to power down the console fell errors:
>> http://www.k-max.name/wp-content/uploads/2012/01/hyper-v.png
[That image shows the message

exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata1.00: failed command: STANDBY IMMEDIATE
]
>> Errors do not interfere with work, but sneaking suspicion about
>> future problems with the hard drive ...
[...]
>> in general, the source of the problem as follows:
>> 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.
[...]
>> connected to a drive:
>> http://www.k-max.name/wp-content/uploads/2012/01/hdd-e1327750214479.png
>> it is defined as a 2:
>> http://www.k-max.name/wp-content/uploads/2012/01/2hdd.png
>> Naturally, the same UUID:
>> http://www.k-max.name/wp-content/uploads/2012/01/blkid.png
>> That's what tells us the directory / dev:
>> http://www.k-max.name/wp-content/uploads/2012/01/uuid.png

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

If I understand correctly, the problem is that ata_piix and hv_storvsc
both 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.

Hoping that clarifies,
Jonathan
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