linux-kernel - Re: [PATCH 4/5] vfio: Introduce vfio_device_ops.get_unmapped

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Message-ID: <a47f33d3-fe50-4e4e-871b-bddc99a27264@redhat.com>
Date: Fri, 13 Jun 2025 20:03:32 +0200
From: David Hildenbrand <david@...hat.com>
To: Peter Xu <peterx@...hat.com>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, kvm@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Alex Williamson <alex.williamson@...hat.com>, Zi Yan <ziy@...dia.com>,
 Jason Gunthorpe <jgg@...dia.com>, Alex Mastro <amastro@...com>,
 Nico Pache <npache@...hat.com>
Subject: Re: [PATCH 4/5] vfio: Introduce vfio_device_ops.get_unmapped_area
 hook

On 13.06.25 15:41, Peter Xu wrote:
> Add a hook to vfio_device_ops to allow sub-modules provide virtual
> addresses for an mmap() request.
> 
> Note that the fallback will be mm_get_unmapped_area(), which should
> maintain the old behavior of generic VA allocation (__get_unmapped_area).
> It's a bit unfortunate that is needed, as the current get_unmapped_area()
> file ops cannot support a retval which fallbacks to the default.  So that
> is needed both here and whenever sub-module will opt-in with its own.
> 
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb