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

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Message-ID: <20250613141807.GK1174925@nvidia.com>
Date: Fri, 13 Jun 2025 11:18:07 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Peter Xu <peterx@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, kvm@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Zi Yan <ziy@...dia.com>, Alex Mastro <amastro@...com>,
	David Hildenbrand <david@...hat.com>,
	Nico Pache <npache@...hat.com>
Subject: Re: [PATCH 4/5] vfio: Introduce vfio_device_ops.get_unmapped_area
 hook

On Fri, Jun 13, 2025 at 09:41:10AM -0400, 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>
> ---
>  drivers/vfio/vfio_main.c | 18 ++++++++++++++++++
>  include/linux/vfio.h     |  7 +++++++
>  2 files changed, 25 insertions(+)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason