linux-kernel - Re: [PATCH v2 02/10] PCI/LUO: Create requested liveupdate device list

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Message-ID: <20251003140457.GO3195829@ziepe.ca>
Date: Fri, 3 Oct 2025 11:04:57 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Chris Li <chrisl@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, Len Brown <lenb@...nel.org>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, David Matlack <dmatlack@...gle.com>,
	Pasha Tatashin <tatashin@...gle.com>,
	Jason Miu <jasonmiu@...gle.com>, Vipin Sharma <vipinsh@...gle.com>,
	Saeed Mahameed <saeedm@...dia.com>,
	Adithya Jayachandran <ajayachandra@...dia.com>,
	Parav Pandit <parav@...dia.com>, William Tu <witu@...dia.com>,
	Mike Rapoport <rppt@...nel.org>, Leon Romanovsky <leon@...nel.org>
Subject: Re: [PATCH v2 02/10] PCI/LUO: Create requested liveupdate device list

On Thu, Oct 02, 2025 at 10:33:20PM -0700, Chris Li wrote:
> The consideration is that some non vfio device like IDPF is preserved
> as well. Does the iommufd encapsulate all the PCI device hierarchy? I
> was thinking the PCI layer knows about the PCI device hierarchy,
> therefore using pci_dev->dev.lu.flags to indicate the participation of
> the PCI liveupdate. Not sure how to drive that from iommufd. Can you
> explain a bit more?

I think you need to start from here and explain what is minimally
needed and identify what gets put in the luo session and what has to
be luo global.

Jason