linux-kernel - Re: [RFC PATCH v2 0/6] powerpc: pSeries: vfio: iommu: Re-enable support for SPAPR TCE VFIO

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Date: Mon, 6 May 2024 14:43:57 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Shivaprasad G Bhat <sbhat@...ux.ibm.com>
Cc: Alexey Kardashevskiy <aik@....com>, mpe@...erman.id.au,
	tpearson@...torengineering.com, alex.williamson@...hat.com,
	linuxppc-dev@...ts.ozlabs.org, npiggin@...il.com,
	christophe.leroy@...roup.eu, aneesh.kumar@...nel.org,
	naveen.n.rao@...ux.ibm.com, gbatra@...ux.vnet.ibm.com,
	brking@...ux.vnet.ibm.com, aik@...abs.ru, ruscur@...sell.cc,
	robh@...nel.org, linux-kernel@...r.kernel.org, joel@....id.au,
	kvm@...r.kernel.org, msuchanek@...e.de, oohall@...il.com,
	mahesh@...ux.ibm.com, jroedel@...e.de, vaibhav@...ux.ibm.com,
	svaidy@...ux.ibm.com
Subject: Re: [RFC PATCH v2 0/6] powerpc: pSeries: vfio: iommu: Re-enable
 support for SPAPR TCE VFIO

On Sat, May 04, 2024 at 12:33:53AM +0530, Shivaprasad G Bhat wrote:
> We have legacy workloads using VFIO in userspace/kvm guests running
> on downstream distro kernels. We want these workloads to be able to
> continue running on our arch.

It has been broken since 2018, I don't find this reasoning entirely
reasonable :\

> I firmly believe the refactoring in this patch series is a step in
> that direction.

But fine, as long as we are going to fix it. PPC really needs this to
be resolved to keep working.

Jason