linux-kernel - RE: [PATCH ACS v3 1/1]

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Date:	Tue, 6 Oct 2009 13:15:54 -0700
From:	"Kay, Allen M" <allen.m.kay@...el.com>
To:	Chris Wright <chrisw@...s-sol.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"matthew@....cx" <matthew@....cx>
Subject: RE: [PATCH ACS v3 1/1]

> I was thinking that ACS could be enabled if an IOMMU is enabled.  Not a
> perfect fit, but seems reasonably close.

Chris, I'm working on a new version of the patch that incorporates iommu check.  I'm also adding a check for dom0 kernel as HW iommu is not visible to dom0.

Allen

-----Original Message-----
From: Chris Wright [mailto:chrisw@...s-sol.org] 
Sent: Wednesday, September 30, 2009 6:17 PM
To: Kay, Allen M
Cc: Chris Wright; linux-kernel@...r.kernel.org; linux-pci@...r.kernel.org; jbarnes@...tuousgeek.org; matthew@....cx
Subject: Re: [PATCH ACS v3 1/1]

* Kay, Allen M (allen.m.kay@...el.com) wrote:
> On the other hand, can we say VT-d PT mode is mainly for KVM
> virtualization use case?  If so, is it reasonable to say performance of
> host P2P in this mode is not of highest priority?

Guess it depends on the workload.  Would be helpful to identify a use
case that is p2p heavy (and then the impact of enabling ACS).

> If not, another option is to have a kernel boot parameter to
> configure an kernel boot instance to be either host kernel optimized or
> virtualization optimized.  I don't know whether this is a reasonable or
> not ...

I was thinking that ACS could be enabled if an IOMMU is enabled.  Not a
perfect fit, but seems reasonably close.

thanks,
-chris
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