linux-kernel - Re: [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication

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Message-ID: <Y4oO8O4wCnWAeoGS@nvidia.com>
Date:   Fri, 2 Dec 2022 10:42:56 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Gerd Bayer <gbayer@...ux.ibm.com>, iommu@...ts.linux.dev,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>,
        linux-s390@...r.kernel.org, borntraeger@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, linux-kernel@...r.kernel.org,
        Julian Ruess <julianr@...ux.ibm.com>
Subject: Re: [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of
 resource indication

On Fri, Dec 02, 2022 at 03:29:50PM +0100, Niklas Schnelle wrote:

> @Robin @Joerg, if you are open to changing .iotlb_sync_map such that it
> can return and error and then failing the mapping operation I think
> this is a great approach. One advantage over the previous approach of
> flushing the queue isthat this should work for the pure IOMMU API too.

I think it is pretty important that the "pure" IOMMU API work with
whatever your solution its, the iommu_domain implementation in a
driver should not be sensitive to if the dma-iommu.c is operating the
domain or something else.

Jason