linux-kernel - Re: [PATCH v3 1/6] dmaengine: idxd: Add enable/disable device IOPF feature

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Message-ID: <f6445aed-bf35-7245-3d52-336ebe11a866@linux.intel.com>
Date:   Mon, 3 Apr 2023 13:49:22 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     iommu@...ts.linux.dev, dmaengine@...r.kernel.org
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Kevin Tian <kevin.tian@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/6] dmaengine: idxd: Add enable/disable device IOPF
 feature

On 3/24/23 8:02 PM, Lu Baolu wrote:
> The iommu subsystem requires IOMMU_DEV_FEAT_IOPF must be enabled before
> and disabled after IOMMU_DEV_FEAT_SVA, if device's I/O page faults rely
> on the IOMMU. Add explicit IOMMU_DEV_FEAT_IOPF enabling/disabling in this
> driver.
> 
> At present, missing IOPF enabling/disabling doesn't cause any real issue,
> because the IOMMU driver places the IOPF enabling/disabling in the path
> of SVA feature handling. But this may change.
> 
> Reviewed-by: Dave Jiang<dave.jiang@...el.com>
> Reviewed-by: Fenghua Yu<fenghua.yu@...el.com>
> Reviewed-by: Kevin Tian<kevin.tian@...el.com>
> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>

Hi Dave and Fenghua,

The following iommu patches depends on this one. Can I route it to
Linus through the iommu tree?

Best regards,
baolu