linux-kernel - RE: [PATCH 24/40] Staging: hv: storvsc: On I/O get the correct IDE device

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Date:	Fri, 1 Jul 2011 13:01:43 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"Abhishek Kane (Mindtree Consulting PVT LTD)" 
	<v-abkane@...rosoft.com>, "Hank Janssen" <hjanssen@...rosoft.com>
Subject: RE: [PATCH 24/40] Staging: hv: storvsc: On I/O get the correct IDE
 device



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Friday, July 01, 2011 4:17 AM
> To: KY Srinivasan
> Cc: Christoph Hellwig; gregkh@...e.de; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; virtualization@...ts.osdl.org; Haiyang Zhang;
> Abhishek Kane (Mindtree Consulting PVT LTD); Hank Janssen
> Subject: Re: [PATCH 24/40] Staging: hv: storvsc: On I/O get the correct IDE device
> 
> On Thu, Jun 30, 2011 at 09:15:54PM +0000, KY Srinivasan wrote:
> > That is what I did initially. Then looking at the way we  were handling scsi
> devices
> > where each scsi controller configured for the guest results in an emulated HBA
> > (scsi host) in the guest and all the block devices under a given controller are
> > handled through this one host, I decided to mimic a similar structure  - one
> > scsi host for all the block devices configured as an IDE device.
> >
> > I can go back to my earlier implementation with one host per disk.
> 
> Was there any downside you noticed from using one host per emulated
> disk?
Nothing I could see from whatever testing I did. However, the guest will have
Scsi hosts that the user did not configure. This is certainly the case in both 
approaches - just the numbers are different!

K. Y 
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