linux-kernel - Re: [PATCH v2 1/5] dmaengine: idxd: Add enable/disable device IOPF feature

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Date:   Wed, 8 Mar 2023 19:51:36 -0800
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>, <iommu@...ts.linux.dev>,
        <dmaengine@...r.kernel.org>
CC:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "Robin Murphy" <robin.murphy@....com>,
        Kevin Tian <kevin.tian@...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 v2 1/5] dmaengine: idxd: Add enable/disable device IOPF
 feature



On 3/8/23 18:56, 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>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

Reviewed-by: Fenghua Yu <fenghua.yu@...el.com>

Thanks.

-Fenghua