linux-kernel - RE: [PATCH 7/8] drivers: scsi: storvsc: Set srb

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Date:	Thu, 10 Jul 2014 22:22:57 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"apw@...onical.com" <apw@...onical.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH 7/8] drivers: scsi: storvsc: Set srb_flags in all cases



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Thursday, July 10, 2014 3:17 AM
> To: KY Srinivasan
> Cc: Christoph Hellwig; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; ohering@...e.com;
> jbottomley@...allels.com; jasowang@...hat.com; apw@...onical.com;
> linux-scsi@...r.kernel.org; stable@...r.kernel.org
> Subject: Re: [PATCH 7/8] drivers: scsi: storvsc: Set srb_flags in all cases
> 
> On Wed, Jul 09, 2014 at 06:40:09PM +0000, KY Srinivasan wrote:
> > > On Tue, Jul 08, 2014 at 05:46:51PM -0700, K. Y. Srinivasan wrote:
> > > > Correctly set SRB flags for all valid I/O directions. Some IHV
> > > > drivers on the Windows host require this.
> > >
> > > What are IHV drivers?
> >
> > If the target is a SAN device, the host simply passes the request over to the
> native driver stack on the host. Some specific hardware (IHV - independent
> hadware vendor) drivers on Windows require that SRB flags be correctly set
> in all cases.
> >
> 
> I'm fine with putting this in, but treating I/O request from guests as trusted in
> a hypervisor doesn't seem like a good idea in general..

The host does  validate the guest request before forwarding the request to the appropriate target.

K. Y
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