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

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Date:   Mon, 18 Nov 2019 21:33:53 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        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>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>, Yi Liu <yi.l.liu@...el.com>
Subject: Re: [PATCH v2 01/10] iommu/vt-d: Introduce native SVM capable flag

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.

Thanks

Eric
>  
>  extern int intel_iommu_sm;
>  
>