From: John Levon <john.levon@nutanix.com>
To: Naman Gulati <namangulati@google.com>
Cc: qemu-devel@nongnu.org,
"Thanos Makatos" <thanos.makatos@nutanix.com>,
"Cédric Le Goater" <clg@redhat.com>,
"Alex Williamson" <alex@shazbot.org>,
"Pierrick Bouvier" <pierrick.bouvier@oss.qualcomm.com>,
"Matt Evans" <matt@ozlabs.org>
Subject: Re: [PATCH v5 1/4] vfio-user: add multi-fd region mmap capability
Date: Tue, 20 Oct 2026 16:37:48 +0100 [thread overview]
Message-ID: <ateKzEbdNeV5BaSB@lent> (raw)
In-Reply-To: <20261014211041.1087331-2-namangulati@google.com>
On Wed, Oct 14, 2026 at 09:10:38PM +0000, Naman Gulati wrote:
> Extend the vfio-user protocol specification to allow servers to pass
> multiple file descriptors for different sparse memory areas within a
> single device region with capability
> VFIO_REGION_INFO_CAP_SPARSE_MMAP_FDS (0x8001), negotiated via the
> "sparse_mmap_fds" capability in VFIO_USER_VERSION.
>
> VFIO_REGION_INFO_CAP_SPARSE_MMAP_FDS defines an array of sparse mmap
> areas where each area contains:
> - offset: Start of the area within the device region (BAR).
> - fd_offset: Start of the mapping within the backing file descriptor.
> - size: Size of the mappable area.
> - fd_index: Zero-based index into the array of file descriptors
> received in the SCM_RIGHTS ancillary data of the
> VFIO_USER_DEVICE_GET_REGION_INFO reply message.
>
> Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>
> Signed-off-by: Naman Gulati <namangulati@google.com>
Reviewed-by: John Levon <john.levon@nutanix.com>
regards
john
next prev parent reply other threads:[~2026-10-20 15:38 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-14 21:10 [PATCH v5 0/4] vfio-user: support multiple FDs backing region mmaps Naman Gulati
2026-10-14 21:10 ` [PATCH v5 1/4] vfio-user: add multi-fd region mmap capability Naman Gulati
2026-10-20 15:37 ` John Levon [this message]
2026-10-14 21:10 ` [PATCH v5 2/4] vfio: add 'fd' and 'fd_offset' to VFIOMmap Naman Gulati
2026-10-15 7:39 ` Cédric Le Goater
2026-10-20 15:37 ` John Levon
2026-10-14 21:10 ` [PATCH v5 3/4] vfio: add setup_sparse_mmaps hook to VFIODeviceIOOps Naman Gulati
2026-10-15 7:39 ` Cédric Le Goater
2026-10-15 7:41 ` Cédric Le Goater
2026-10-20 15:38 ` John Levon
2026-10-14 21:10 ` [PATCH v5 4/4] vfio-user: support multiple FDs for sparse mmap regions Naman Gulati
2026-10-15 7:45 ` Cédric Le Goater
2026-10-20 15:35 ` John Levon
2026-10-20 21:27 ` Thanos Makatos
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