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

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To: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
Subject: Re: [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication
From: Jason Gunthorpe <jgg@xxxxxxxxxx>
Date: Fri, 2 Dec 2022 11:24:48 -0400
Cc: Robin Murphy <robin.murphy@xxxxxxx>, Matthew Rosato <mjrosato@xxxxxxxxxxxxx>, Gerd Bayer <gbayer@xxxxxxxxxxxxx>, iommu@xxxxxxxxxxxxxxx, Joerg Roedel <joro@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Wenjia Zhang <wenjia@xxxxxxxxxxxxx>, Pierre Morel <pmorel@xxxxxxxxxxxxx>, linux-s390@xxxxxxxxxxxxxxx, borntraeger@xxxxxxxxxxxxx, hca@xxxxxxxxxxxxx, gor@xxxxxxxxxxxxx, gerald.schaefer@xxxxxxxxxxxxx, agordeev@xxxxxxxxxxxxx, svens@xxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Julian Ruess <julianr@xxxxxxxxxxxxx>
In-reply-to: <175d97e1a9d29d712f0334e37fc207a50c3ac5e7.camel@linux.ibm.com>
References: <20221116171656.4128212-1-schnelle@linux.ibm.com> <20221116171656.4128212-8-schnelle@linux.ibm.com> <cf0fed35-2d9d-3d19-3538-1ddcbfd563b0@arm.com> <8ae4c9b196aec34df4644ffecb66cfa4ce953244.camel@linux.ibm.com> <6cd52999-7b01-a613-a9fb-f09a845a27b3@arm.com> <c6c4458bb49d1144a304e34c65a70dc2ebbb4082.camel@linux.ibm.com> <c06dc451129127b660d40886afe89c92471a913a.camel@linux.ibm.com> <Y4oO8O4wCnWAeoGS@nvidia.com> <175d97e1a9d29d712f0334e37fc207a50c3ac5e7.camel@linux.ibm.com>

On Fri, Dec 02, 2022 at 04:12:50PM +0100, Niklas Schnelle wrote:

> https://git.kernel.org/pub/scm/linux/kernel/git/niks/linux.git/commit/?h=dma_iommu_v3&id=a2aecd821fe3c5e2549946a68d8b07e05b288a9b

This patch makes sense to me, if the sync-map is optimally a
hypervisor call and the hypervisor is allowed to fail it, then
propagating the failure seems necessary.

Jason

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References:
- [PATCH v2 0/7] iommu/dma: s390 DMA API conversion and optimized IOTLB flushing
  - From: Niklas Schnelle
- [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication
  - From: Niklas Schnelle
- Re: [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication
  - From: Robin Murphy
- Re: [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication
  - From: Niklas Schnelle
- Re: [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication
  - From: Robin Murphy
- Re: [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication
  - From: Niklas Schnelle
- Re: [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication
  - From: Niklas Schnelle
- Re: [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication
  - From: Jason Gunthorpe
- Re: [PATCH v2 7/7] iommu/s390: flush queued IOVAs on RPCIT out of resource indication
  - From: Niklas Schnelle

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