linux-kernel - Re: [RFC PATCH v6 1/2] mm: guestmem: introduce guestmem library

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Message-ID: <aMjEt1JKjf789o24@casper.infradead.org>
Date: Tue, 16 Sep 2025 03:00:23 +0100
From: Matthew Wilcox <willy@...radead.org>
To: "Kalyazin, Nikita" <kalyazin@...zon.co.uk>
Cc: "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"david@...hat.com" <david@...hat.com>,
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	"Manwaring, Derek" <derekmn@...zon.com>,
	"Cali, Marco" <xmarcalx@...zon.co.uk>
Subject: Re: [RFC PATCH v6 1/2] mm: guestmem: introduce guestmem library

On Mon, Sep 15, 2025 at 04:18:27PM +0000, Kalyazin, Nikita wrote:
> From: Nikita Kalyazin <kalyazin@...zon.com>
> 
> Move MM-generic parts of guest_memfd from KVM to MM.  This allows other
> hypervisors to use guestmem code and enables UserfaultFD implementation
> for guest_memfd [1].  Previously it was not possible because KVM (and
> guest_memfd code) might be built as a module.

https://lore.kernel.org/kvm/Z0DOdTRAaK3whZKW@casper.infradead.org/
remains un-addressed.

ie this entire approach is garbage.  throw it away and start again.