From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "DRI Development" <dri-devel@lists.freedesktop.org>,
LKML <linux-kernel@vger.kernel.org>,
kvm@vger.kernel.org, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org,
linux-s390@vger.kernel.org,
"Daniel Vetter" <daniel.vetter@intel.com>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Kees Cook" <keescook@chromium.org>,
"Dan Williams" <dan.j.williams@intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"John Hubbard" <jhubbard@nvidia.com>,
"Jérôme Glisse" <jglisse@redhat.com>, "Jan Kara" <jack@suse.cz>,
"Bjorn Helgaas" <bhelgaas@google.com>,
linux-pci@vger.kernel.org,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Christian Brauner" <christian.brauner@ubuntu.com>,
"David S. Miller" <davem@davemloft.net>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"Sourabh Jain" <sourabhjain@linux.ibm.com>,
"Mauro Carvalho Chehab" <mchehab+huawei@kernel.org>,
"Nayna Jain" <nayna@linux.ibm.com>
Subject: Re: [PATCH v2 15/17] sysfs: Support zapping of binary attr mmaps
Date: Fri, 9 Oct 2020 12:58:03 +0200 [thread overview]
Message-ID: <20201009105803.GA505688@kroah.com> (raw)
In-Reply-To: <20201009075934.3509076-16-daniel.vetter@ffwll.ch>
On Fri, Oct 09, 2020 at 09:59:32AM +0200, Daniel Vetter wrote:
> We want to be able to revoke pci mmaps so that the same access rules
> applies as for /dev/kmem. Revoke support for devmem was added in
> 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims the
> region").
>
> The simplest way to achieve this is by having the same filp->f_mapping
> for all mappings, so that unmap_mapping_range can find them all, no
> matter through which file they've been created. Since this must be set
> at open time we need sysfs support for this.
>
> Add an optional mapping parameter bin_attr, which is only consulted
> when there's also an mmap callback, since without mmap support
> allowing to adjust the ->f_mapping makes no sense.
>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Jason Gunthorpe <jgg@ziepe.ca>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: John Hubbard <jhubbard@nvidia.com>
> Cc: Jérôme Glisse <jglisse@redhat.com>
> Cc: Jan Kara <jack@suse.cz>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: linux-mm@kvack.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-samsung-soc@vger.kernel.org
> Cc: linux-media@vger.kernel.org
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: linux-pci@vger.kernel.org
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Christian Brauner <christian.brauner@ubuntu.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Sourabh Jain <sourabhjain@linux.ibm.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> Cc: Nayna Jain <nayna@linux.ibm.com>
> ---
> fs/sysfs/file.c | 11 +++++++++++
> include/linux/sysfs.h | 2 ++
> 2 files changed, 13 insertions(+)
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
next prev parent reply other threads:[~2020-10-09 10:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20201009075934.3509076-1-daniel.vetter@ffwll.ch>
2020-10-09 7:59 ` [PATCH v2 12/17] PCI: Obey iomem restrictions for procfs mmap Daniel Vetter
2020-10-09 7:59 ` [PATCH v2 15/17] sysfs: Support zapping of binary attr mmaps Daniel Vetter
2020-10-09 10:58 ` Greg Kroah-Hartman [this message]
2020-10-09 7:59 ` [PATCH v2 16/17] PCI: Revoke mappings like devmem Daniel Vetter
2020-10-09 7:59 ` [PATCH v2 17/17] drm/i915: Properly request PCI BARs Daniel Vetter
2020-10-09 9:47 ` Ville Syrjälä
2020-10-09 10:01 ` Daniel Vetter
2020-10-09 10:41 ` Ville Syrjälä
2020-10-09 14:18 ` Daniel Vetter
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