linux-kernel - Re: Implementing NVMHCI...

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Date:	Mon, 13 Apr 2009 10:38:02 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Avi Kivity <avi@...hat.com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Szabolcs Szakacsits <szaka@...s-3g.com>,
	Grant Grundler <grundler@...gle.com>,
	Linux IDE mailing list <linux-ide@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: Implementing NVMHCI...

On Mon, 2009-04-13 at 08:10 -0700, Linus Torvalds wrote:
> On Mon, 13 Apr 2009, Avi Kivity wrote:
> > > Of course, the _really_ conclusive thing (in a virtualized environment) is
> > > to just make the virtual disk only able to do 16kB IO accesses (and with
> > > 16kB alignment). IOW, actually emulate a disk with a 16kB hard sector size,
> > > and reporting a 16kB sector size to the READ CAPACITY command. If it works
> > > then, then clearly WNT has no issues with bigger sectors.
> > 
> > I don't think IDE supports this?  And Windows 2008 doesn't like the LSI
> > emulated device we expose.
> 
> Yeah, you'd have to have the OS use the SCSI commands for disk discovery, 
> so at least a SATA interface. With IDE disks, the sector size always has 
> to be 512 bytes, I think.

Actually, the latest ATA rev supports different sector sizes in
preparation for native 4k sector size SATA disks (words 117-118 of
IDENTIFY).  Matthew Wilcox already has the patches for libata ready.

James


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