[Bug 52821] New: ata_piix ATA_HOST_IGNORE_ATA for Hyper-V also affects Virtual PC 7

[Bug 52821] New: ata_piix ATA_HOST_IGNORE_ATA for Hyper-V also affects Virtual PC 7

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=52821

           Summary: ata_piix ATA_HOST_IGNORE_ATA for Hyper-V also affects
                    Virtual PC 7
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 3.4+
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: IDE
        AssignedTo: io_ide@kernel-bugs.osdl.org
        ReportedBy: linuxuser330250@gmx.net
        Regression: No


[PATCH 2/2] ata_piix: defer disks to the Hyper-V drivers by default
Sat, 14 Apr 2012 16:53:16 +0100

https://lkml.org/lkml/2012/4/14/136

This patch apparently also affects Virtual PC 7.0.3 for Mac, with the result
that only the emulated CD/DVD drive is visible to the system due to a missing
paravirtualised
driver for the ATA device. An installation of Linux (with a kernel 3.4 and
newer) in the emulated environment of VPC7 is therefor impossible.

The problem seems to be that VPC7 also provides DMI 2.3, which also contains
the strings "Microsoft Corporation" and "Virtual Machine" -- just like Hyper-V.

VPC6 (Connectix Virtual PC 6.0) is not affected. (UNCONFIRMED, but 99% sure:
there cannot be "Microsoft Corporation" in it, because it was from Connectix!)

I don’t know how, but piix_ignore_devices_quirk should either be more thorough
in identifying Hyper-V or it should confirm that it is not running inside
Virtual PC.

I would be happy to help with inside data, like a DMI dump or anything, but
you’d have to tell me exactly what to do.

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[Bug 52821] ata_piix ATA_HOST_IGNORE_ATA for Hyper-V also affects Virtual PC 7

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=52821





--- Comment #1 from Andreas <linuxuser330250@gmx.net>  2013-01-19 00:35:41 ---
I’ve just found that the kernel parameter ata_piix.prefer_ms_hyperv=0 works,
but it is a very inconvenient way to work around this problem.

On the other hand, who is still using PowerPC-based Macs with Microsoft Virtual
PC 7.0 and with modern Linux distributions?

As long as this parameter to disable the Hyper-V patch is there, at least it
does work with a little extra work.

Still, if there is a way to cleanly identify Hyper-V but not Virtual PC 7, this
would be great!

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[Bug 52821] ata_piix ATA_HOST_IGNORE_ATA for Hyper-V also affects Virtual PC 7

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=52821


Andreas <linuxuser330250@gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |PATCH_ALREADY_AVAILABLE




--- Comment #2 from Andreas <linuxuser330250@gmx.net>  2013-01-30 22:19:21 ---
First appearance:
https://bugzilla.novell.com/show_bug.cgi?id=737532
Patch:
https://lkml.org/lkml/2012/9/18/306

Since I discovered the bug in a recent version of a bootable ISO, I assume a
lot of recent distros are still affected.
Anyway, future releases should be fixed. Thanks.

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