linux-kernel - Re: [PATCH v2 04/22] vfio/pci: Register a file handler with Live Update Orchestrator

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Message-ID: <aYZ15u120FEa8Qw2@google.com>
Date: Fri, 6 Feb 2026 23:14:46 +0000
From: David Matlack <dmatlack@...gle.com>
To: "Yanjun.Zhu" <yanjun.zhu@...ux.dev>
Cc: Alex Williamson <alex@...zbot.org>,
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Subject: Re: [PATCH v2 04/22] vfio/pci: Register a file handler with Live
 Update Orchestrator

On 2026-02-06 02:37 PM, Yanjun.Zhu wrote:
> On 1/29/26 1:24 PM, David Matlack wrote:

> > +int __init vfio_pci_liveupdate_init(void)
> > +{
> > +	if (!liveupdate_enabled())
> > +		return 0;
> 813 int liveupdate_register_file_handler(struct liveupdate_file_handler *fh)
> 814 {
> 815         struct liveupdate_file_handler *fh_iter;
> 816         int err;
> 817
> 818         if (!liveupdate_enabled())
> 
> 819                 return -EOPNOTSUPP;
> 
> In the function liveupdate_register_file_handler, liveupdate_enabled is also checked.
> as such, it is not necessary to check here?

Yeah that is a bit odd. I see that memfd_luo_init() just checks for
-EOPNOTSUPP. We can do the same thing here.