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

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Message-ID: <20191119090628.7295cd7d@jacob-builder>
Date:   Tue, 19 Nov 2019 09:06:28 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Auger Eric <eric.auger@...hat.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        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 Tue, 19 Nov 2019 10:55:29 +0800
Lu Baolu <baolu.lu@...ux.intel.com> wrote:

> Hi,
> 
> On 11/19/19 5:48 AM, Jacob Pan wrote:
> > 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?  
> 
> It's okay for me.
> 
will squash then.
Thanks!
> Best regards,
> baolu

[Jacob Pan]