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

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Message-ID: <20240501140942.GA1723318@ziepe.ca>
Date: Wed, 1 May 2024 11:09:42 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Shivaprasad G Bhat <sbhat@...ux.ibm.com>
Cc: mpe@...erman.id.au, tpearson@...torengineering.com,
	alex.williamson@...hat.com, linuxppc-dev@...ts.ozlabs.org,
	aik@....com, 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 Tue, Apr 30, 2024 at 03:05:34PM -0500, Shivaprasad G Bhat wrote:
> RFC v1 was posted here [1]. As I was testing more and fixing the
> issues, I realized its clean to have the table_group_ops implemented
> the way it is done on PowerNV and stop 'borrowing' the DMA windows
> for pSeries.
> 
> This patch-set implements the iommu table_group_ops for pSeries for
> VFIO SPAPR TCE sub-driver thereby enabling the VFIO support on POWER
> pSeries machines.

Wait, did they previously not have any support?

Again, this TCE stuff needs to go away, not grow. I can grudgingly
accept fixing it where it used to work, but not enabling more HW that
never worked before! :(

Jason