linux-kernel - Re: [RFC PATCH 13/15] iommufd: Persist iommu domains for live update

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Message-ID: <CA+CK2bAvnTTz+vPg7v38_1dajRZQHyPQ8iDmziiW8GFUqy6=Ag@mail.gmail.com>
Date: Wed, 1 Oct 2025 15:28:56 -0400
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: Samiullah Khawaja <skhawaja@...gle.com>, David Woodhouse <dwmw2@...radead.org>, 
	Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>, 
	Will Deacon <will@...nel.org>, iommu@...ts.linux.dev, YiFei Zhu <zhuyifei@...gle.com>, 
	Robin Murphy <robin.murphy@....com>, Pratyush Yadav <pratyush@...nel.org>, 
	Kevin Tian <kevin.tian@...el.com>, linux-kernel@...r.kernel.org, 
	Saeed Mahameed <saeedm@...dia.com>, Adithya Jayachandran <ajayachandra@...dia.com>, 
	Parav Pandit <parav@...dia.com>, Leon Romanovsky <leonro@...dia.com>, William Tu <witu@...dia.com>, 
	Vipin Sharma <vipinsh@...gle.com>, dmatlack@...gle.com, Chris Li <chrisl@...nel.org>, 
	praan@...gle.com
Subject: Re: [RFC PATCH 13/15] iommufd: Persist iommu domains for live update

> > 3. On FINISH, the IOMMU core updates the context entries of preserved
> > devices to point to the new domain.
>
> No, finish should never do anything on the restore path, IMHO. User
> should directly attach the newly created HWPT when it is ready.

But, finish is our indicator that a particular session (VM) is out of
blackout, and now we are free to do slow things, such as
re-allocating/recreating page tables. Why start it before a VM is out
of blackout?