linux-kernel - [PATCH RFC 0/3] MAP_POPULATE for device memory

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Message-Id: <20220306053211.135762-1-jarkko@kernel.org>
Date:   Sun,  6 Mar 2022 07:32:04 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     linux-mm@...ck.org
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Nathaniel McCallum <nathaniel@...fian.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Matthew Auld <matthew.auld@...el.com>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Jason Ekstrand <jason@...kstrand.net>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Vasily Averin <vvs@...tuozzo.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Michal Hocko <mhocko@...e.com>,
        zhangyiru <zhangyiru3@...wei.com>,
        Alexey Gladkov <legion@...nel.org>,
        Alexander Mikhalitsyn <alexander.mikhalitsyn@...tuozzo.com>,
        linux-mips@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, codalist@...a.cs.cmu.edu,
        linux-unionfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH RFC 0/3] MAP_POPULATE for device memory

For device memory (aka VM_IO | VM_PFNMAP) MAP_POPULATE does nothing. Allow
to use that for initializing the device memory by providing a new callback
f_ops->populate() for the purpose.

SGX patches are provided to show the callback in context.

An obvious alternative is a ioctl but it is less elegant and requires
two syscalls (mmap + ioctl) per memory range, instead of just one
(mmap).

Jarkko Sakkinen (3):
  mm: Add f_ops->populate()
  x86/sgx: Export sgx_encl_page_alloc()
  x86/sgx: Implement EAUG population with MAP_POPULATE

 arch/mips/kernel/vdso.c                    |   2 +-
 arch/x86/kernel/cpu/sgx/driver.c           | 129 +++++++++++++++++++++
 arch/x86/kernel/cpu/sgx/encl.c             |  38 ++++++
 arch/x86/kernel/cpu/sgx/encl.h             |   3 +
 arch/x86/kernel/cpu/sgx/ioctl.c            |  38 ------
 drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c |   2 +-
 fs/coda/file.c                             |   2 +-
 fs/overlayfs/file.c                        |   2 +-
 include/linux/fs.h                         |  12 +-
 include/linux/mm.h                         |   2 +-
 ipc/shm.c                                  |   2 +-
 mm/mmap.c                                  |  10 +-
 mm/nommu.c                                 |   4 +-
 13 files changed, 193 insertions(+), 53 deletions(-)

-- 
2.35.1