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    SubjectRE: [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@sous-sol.org]
    Sent: Wednesday, September 30, 2009 6:17 PM
    To: Kay, Allen M
    Cc: Chris Wright; linux-kernel@vger.kernel.org; linux-pci@vger.kernel.org; jbarnes@virtuousgeek.org; matthew@wil.cx
    Subject: Re: [PATCH ACS v3 1/1]

    * Kay, Allen M (allen.m.kay@intel.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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