linux-kernel - Re: [PATCH v11 0/8] Re-enable IDXD kernel workqueue under DMA API

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Message-ID: <ZMptngQ3vzpJLRTG@nvidia.com>
Date:   Wed, 2 Aug 2023 11:52:14 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, iommu@...ts.linux.dev,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        "Tian, Kevin" <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH v11 0/8] Re-enable IDXD kernel workqueue under DMA API

On Mon, Jul 24, 2023 at 03:25:30PM -0700, Jacob Pan wrote:
> Hi Joerg and all,
> 
> IDXD kernel work queues were disabled due to the flawed use of kernel VA
> and SVA API.
> Link: https://lore.kernel.org/linux-iommu/20210511194726.GP1002214@nvidia.com/
> 
> The solution is to enable it under DMA API where IDXD shared workqueue users
> can use ENQCMDS to submit work on buffers mapped by DMA API.
> 
> This patchset adds support for attaching PASID to the device's default
> domain and the ability to allocate global PASIDs from IOMMU APIs. IDXD driver
> can then re-enable the kernel work queues and use them under DMA API.
> 
> This depends on the IOASID removal series. (merged)
> https://lore.kernel.org/all/ZCaUBJvUMsJyD7EW@8bytes.org/

If the vt-d driver bits are fine I think this series is OK

Thanks,
Jason