linux-kernel - Re: [PATCH v7 12/12] iommu: Improve iopf_queue_flush

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Date:   Mon, 4 Dec 2023 09:27:32 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Baolu Lu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>,
        Yi Liu <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Yan Zhao <yan.y.zhao@...el.com>, iommu@...ts.linux.dev,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 12/12] iommu: Improve iopf_queue_flush_dev()

On Mon, Dec 04, 2023 at 11:46:30AM +0800, Baolu Lu wrote:
> On 12/2/23 4:35 AM, Jason Gunthorpe wrote:

> I am wondering whether we can take patch 1/12 ~ 10/12 of this series as
> a first step, a refactoring effort to support delivering iopf to
> userspace? I will follow up with one or multiple series to add the
> optimizations.

I think that is reasonable, though I would change the earlier patch to
use RCU to obtain the fault data.

Jason