linux-kernel - Re: [PATCH v2 03/10] PCI/LUO: Forward prepare()/freeze()/cancel() callbacks to driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CACePvbXGq8Aau_sQiZx0pOQEB82GjoL2=ed4DCPU=N1XZRJ-5Q@mail.gmail.com>
Date: Fri, 3 Oct 2025 10:44:24 -0700
From: Chris Li <chrisl@...nel.org>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: David Matlack <dmatlack@...gle.com>, 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, 
	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 03/10] PCI/LUO: Forward prepare()/freeze()/cancel()
 callbacks to driver

On Fri, Oct 3, 2025 at 5:06 AM Jason Gunthorpe <jgg@...pe.ca> wrote:
>
> On Thu, Oct 02, 2025 at 10:24:59PM -0700, Chris Li wrote:
>
> > As David pointed out in the other email, the PCI also supports other
> > non vfio PCI devices which do not have the FD and FD related sessions.
> > That is the original intent for the LUO PCI subsystem.
>
> This doesn't make sense. We don't know how to solve this problem yet,
> but I'm pretty confident we will need to inject a FD and session into
> these drivers too.

Ack. I can start hacking on hook up the PCI layer to the vfio FD and
sessions. Not sure how to do that at this point yet, I will give it a
stab and report back.

>
> > away once we have the vfio-pci as the real user. Actually getting the
> > pci-pf-stub driver working would be a smaller and reasonable step to
> > justify the PF support in LUO PCI.
>
> In this contex pci-pf-stub is useless, just use vfio-pci as the SRIOV
> stub. I wouldn't invest in it. Especially since it creates more
> complexity because we don't have an obvious way to get the session FD.

Ack. I will not do pci-pf-stub then.

Chris