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

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Message-ID: <CACePvbWbW-YVHAL0rO-6Ao16LELnd8R70Gj0+QZHptVRk0C50A@mail.gmail.com>
Date: Fri, 3 Oct 2025 14:10:01 -0700
From: Chris Li <chrisl@...nel.org>
To: David Matlack <dmatlack@...gle.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	"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>, Jason Gunthorpe <jgg@...pe.ca>, 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 11:28 AM David Matlack <dmatlack@...gle.com> wrote:
>
> On Fri, Oct 3, 2025 at 10:49 AM Chris Li <chrisl@...nel.org> wrote:
> >
> > On Fri, Oct 3, 2025 at 5:26 AM Greg Kroah-Hartman
> > NVME is not a GPU. The internal reason to have NVME participate in the
> > liveupdate is because the NVME shutdown of the IO queue is very slow,
> > it contributes the largest chunk of delay in the black out window for
> > liveupdate. The NVME participation is just an optimization to avoid
> > resetting the NVME queue. Consider it as (optional ) speed
> > optimization.
>
> This is not true. We haven't made any changes to the nvme driver
> within Google for Live Update.
>
> The reason I mentioned nvme in another email chain is because Google
> has some hosts where we want to preserve VFs bound to vfio-pci across
> Live Update where the PF is bound to nvme. But Jason is suggesting we
> seriously explore switching the PF driver to vfio-pci before trying to
> upstream nvme support for Live Update, which I think is fair.

Ah, thanks for the clarification and sorry for my confusion. I think I
was thinking of a different storage driver, not the NVME you have in
mind.

Chris