linux-kernel - Re: [RFC 13/18] vfio: add ioctl to define persistent pgtables on container

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Message-ID: <20240205170839.GA31743@ziepe.ca>
Date: Mon, 5 Feb 2024 13:08:39 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: James Gowans <jgowans@...zon.com>
Cc: linux-kernel@...r.kernel.org, Eric Biederman <ebiederm@...ssion.com>,
	kexec@...ts.infradead.org, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, iommu@...ts.linux.dev,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	linux-fsdevel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Alexander Graf <graf@...zon.com>,
	David Woodhouse <dwmw@...zon.co.uk>,
	"Jan H . Schoenherr" <jschoenh@...zon.de>,
	Usama Arif <usama.arif@...edance.com>,
	Anthony Yznaga <anthony.yznaga@...cle.com>,
	Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>,
	madvenka@...ux.microsoft.com, steven.sistare@...cle.com,
	yuleixzhang@...cent.com
Subject: Re: [RFC 13/18] vfio: add ioctl to define persistent pgtables on
 container

On Mon, Feb 05, 2024 at 12:01:58PM +0000, James Gowans wrote:
> The previous commits added a file type in pkernfs for IOMMU persistent
> page tables. Now support actually setting persistent page tables on an
> IOMMU domain. This is done via a VFIO ioctl on a VFIO container.

Please no changes to VFIO in the iommu area, new features need to be
implemented on top of iommufd instead.

We already have the infrastructure there to customize iommu_domain
allocations that this can be implemented on top of.

Jason