From: KY Srinivasan <kys@microsoft.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andy Whitcroft <apw@canonical.com>,
Jeff Garzik <jgarzik@pobox.com>,
"linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Mike Sterling <mike.sterling@microsoft.com>
Subject: RE: [PATCH 0/2] Hyper-V disk support V3
Date: Wed, 18 Apr 2012 20:21:48 +0000 [thread overview]
Message-ID: <426367E2313C2449837CD2DE46E7EAF92CE8E2@CH1PRD0310MB381.namprd03.prod.outlook.com> (raw)
In-Reply-To: <20120418211235.55b9befc@pyramind.ukuu.org.uk>
> -----Original Message-----
> From: Alan Cox [mailto:alan@lxorguk.ukuu.org.uk]
> Sent: Wednesday, April 18, 2012 4:13 PM
> To: KY Srinivasan
> Cc: Andy Whitcroft; Jeff Garzik; linux-ide@vger.kernel.org; linux-
> kernel@vger.kernel.org; Mike Sterling
> Subject: Re: [PATCH 0/2] Hyper-V disk support V3
>
> > The notion of "pass through" in Hyper-V is a little different. IDE devices can be
> configured
> > under either one of the supported controllers and these devices can either be
> virtual disks
> > (VHDs) or physical disks. In either case these will be presented to the guest as
> IDE devices.
>
> So what ensures that by skipping it at the ATA device level we will
> always find it as a VHD ?
If the Hyper-V storage driver is present, then the Hyper-V storage driver will
manage the root device (and other devices skipped by the ata driver).
So, the check if we are running on Hyper-V is not enough
to skip the device in the ata_piix driver; we need to also make sure that the Hyper-V
block driver is available to handle the skipped devices. I think the correct approach here is to
have a kernel (or an ata_piix module parameter) that can be set to override the skipping
of the block device by the ata driver. Distros that are including the Hyper-V storage driver
can set this parameter so that when running on Hyper-V, ata can skip the block device.
Regards,
K. Y
>
> Alan
>
>
next prev parent reply other threads:[~2012-04-18 20:23 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-29 17:28 [PATCH 1/1] ata_piix: defer disks to the Hyper-V paravirtualised drivers by default Andy Whitcroft
2012-03-30 9:14 ` Victor Miasnikov
2012-03-30 9:14 ` Victor Miasnikov
2012-04-10 16:08 ` KY Srinivasan
2012-04-12 15:55 ` Andy Whitcroft
2012-04-12 20:03 ` Jeff Garzik
2012-04-13 7:37 ` Andy Whitcroft
2012-04-14 15:53 ` [PATCH 0/2] Hyper-V disk support Andy Whitcroft
2012-04-14 15:53 ` [PATCH 1/2] libata: add a host flag to ignore detected ATA devices Andy Whitcroft
2012-04-14 15:53 ` [PATCH 2/2] ata_piix: defer disks to the Hyper-V drivers by default Andy Whitcroft
2012-04-14 16:02 ` Alan Cox
2012-04-15 0:10 ` KY Srinivasan
2012-04-16 11:20 ` [PATCH 0/2] Hyper-V disk support V3 Andy Whitcroft
2012-04-16 11:20 ` [PATCH 1/2] libata: add a host flag to ignore detected ATA devices Andy Whitcroft
2012-04-16 11:20 ` [PATCH 2/2] UBUNTU: SAUCE: ata_piix: defer disks to the Hyper-V drivers by default Andy Whitcroft
2012-04-16 11:28 ` Sergei Shtylyov
2012-04-16 11:26 ` [PATCH 0/2] Hyper-V disk support V3 Alan Cox
2012-04-16 18:29 ` Andy Whitcroft
2012-04-16 18:41 ` KY Srinivasan
2012-04-18 20:12 ` Alan Cox
2012-04-18 20:21 ` KY Srinivasan [this message]
2012-04-19 8:15 ` 1) boot flag to disable the Hyper-V IDE drivers: ata_piix.prefer_ms_hyperv=0 2) PIIX_IGNORE_ATA_ON_HYPERV Re: [PATCH 0/2] Hyper-V disk support V3 RE: use hv_storvsc instead of ata_piix to handle the IDE disks devices ( but not for the CD-ROM) Victor Miasnikov
2012-04-19 8:15 ` Victor Miasnikov
2012-04-19 7:40 ` [PATCH 0/2] Hyper-V disk support V3 Andy Whitcroft
2012-04-19 13:17 ` KY Srinivasan
2012-04-19 14:33 ` [PATCH 0/2] Hyper-V disk support V4 Andy Whitcroft
2012-04-19 14:33 ` [PATCH 1/2] libata: add a host flag to ignore detected ATA devices Andy Whitcroft
2012-04-19 14:33 ` [PATCH 2/2] ata_piix: defer disks to the Hyper-V drivers by default Andy Whitcroft
2012-04-19 15:54 ` Sergei Shtylyov
2012-05-04 21:15 ` [PATCH 0/2] Hyper-V disk support V5 Andy Whitcroft
2012-05-04 21:15 ` [PATCH 1/2] libata: add a host flag to ignore detected ATA devices Andy Whitcroft
2012-05-07 19:43 ` Jeff Garzik
2012-05-04 21:15 ` [PATCH 2/2] ata_piix: defer disks to the Hyper-V drivers by default Andy Whitcroft
2012-04-16 15:32 ` [PATCH 0/2] Hyper-V disk support V3 Jeff Garzik
2012-04-16 18:28 ` Andy Whitcroft
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