linux-kernel - Re: [PATCH v2 01/10] iommu/vt-d: Introduce native SVM capable flag

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Date:   Mon, 18 Nov 2019 13:48:09 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Auger Eric <eric.auger@...hat.com>
Cc:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v2 01/10] iommu/vt-d: Introduce native SVM capable flag

On Mon, 18 Nov 2019 21:33:53 +0100
Auger Eric <eric.auger@...hat.com> wrote:

> Hi Jacob,
> 
> On 11/18/19 8:42 PM, Jacob Pan wrote:
> > Shared Virtual Memory(SVM) is based on a collective set of hardware
> > features detected at runtime. There are requirements for matching
> > CPU and IOMMU capabilities.
> > 
> > This patch introduces a flag which will be used to mark and test the
> > capability of SVM.
> > 
> > Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> > Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>
> > ---
> >  include/linux/intel-iommu.h | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/include/linux/intel-iommu.h
> > b/include/linux/intel-iommu.h index ed11ef594378..63118991824c
> > 100644 --- a/include/linux/intel-iommu.h
> > +++ b/include/linux/intel-iommu.h
> > @@ -433,6 +433,7 @@ enum {
> >  
> >  #define VTD_FLAG_TRANS_PRE_ENABLED	(1 << 0)
> >  #define VTD_FLAG_IRQ_REMAP_PRE_ENABLED	(1 << 1)
> > +#define VTD_FLAG_SVM_CAPABLE		(1 << 2)  
> 
> I think I would rather squash this into the next patch as there is no
> user here.
> 
Sure, I don't have strong preference. Baolu, what is your call?

> Thanks
> 
> Eric
> >  
> >  extern int intel_iommu_sm;
> >  
> >   
> 

[Jacob Pan]