From: Catalin Marinas <catalin.marinas@arm.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>,
linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
Will Deacon <will.deacon@arm.com>,
Andrey Konovalov <andreyknvl@google.com>,
Szabolcs Nagy <szabolcs.nagy@arm.com>
Subject: Re: [PATCH v6 1/2] arm64: Define Documentation/arm64/tagged-address-abi.rst
Date: Fri, 2 Aug 2019 11:08:35 +0100 [thread overview]
Message-ID: <20190802100835.GA4175@arrakis.emea.arm.com> (raw)
In-Reply-To: <b74e7ce7-d58a-68a0-2f28-6648ec6302c0@intel.com>
Hi Dave,
On Wed, Jul 31, 2019 at 09:43:46AM -0700, Dave Hansen wrote:
> On 7/25/19 6:50 AM, Vincenzo Frascino wrote:
> > With the relaxed ABI proposed through this document, it is now possible
> > to pass tagged pointers to the syscalls, when these pointers are in
> > memory ranges obtained by an anonymous (MAP_ANONYMOUS) mmap().
>
> I don't see a lot of description of why this restriction is necessary.
> What's the problem with supporting MAP_SHARED?
We could support MAP_SHARED | MAP_ANONYMOUS (and based on some internal
discussions, this would be fine with the hardware memory tagging as
well). What we don't want in the ABI is to support file mmap() for
top-byte-ignore (or MTE). If you see a use-case, please let us know.
--
Catalin
next prev parent reply other threads:[~2019-08-02 10:08 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-23 17:58 [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 01/15] arm64: untag user pointers in access_ok and __uaccess_mask_ptr Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 02/15] arm64: Introduce prctl() options to control the tagged user addresses ABI Andrey Konovalov
2019-07-31 17:05 ` Dave Hansen
2019-08-01 12:38 ` Kevin Brodsky
2019-08-01 16:45 ` Dave Hansen
2019-08-02 10:50 ` Catalin Marinas
2019-08-09 16:08 ` Catalin Marinas
2019-07-23 17:58 ` [PATCH v19 03/15] lib: untag user pointers in strn*_user Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 04/15] mm: untag user pointers passed to memory syscalls Andrey Konovalov
2019-08-09 16:03 ` Catalin Marinas
2019-07-23 17:58 ` [PATCH v19 05/15] mm: untag user pointers in mm/gup.c Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 06/15] mm: untag user pointers in get_vaddr_frames Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 07/15] fs/namespace: untag user pointers in copy_mount_options Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 08/15] userfaultfd: untag user pointers Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 09/15] drm/amdgpu: " Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 10/15] drm/radeon: untag user pointers in radeon_gem_userptr_ioctl Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 11/15] IB/mlx4: untag user pointers in mlx4_get_umem_mr Andrey Konovalov
2019-07-24 19:25 ` Jason Gunthorpe
2019-07-25 11:17 ` Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 12/15] media/v4l2-core: untag user pointers in videobuf_dma_contig_user_get Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 13/15] tee/shm: untag user pointers in tee_shm_register Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 14/15] vfio/type1: untag user pointers in vaddr_get_pfn Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 15/15] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov
2019-07-23 18:03 ` [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-07-24 14:02 ` Will Deacon
2019-07-24 14:16 ` Andrey Konovalov
2019-07-24 14:20 ` Will Deacon
2019-07-24 17:12 ` Vincenzo Frascino
2019-08-06 17:13 ` Will Deacon
2019-08-07 17:17 ` Andrey Konovalov
2019-08-08 21:12 ` Kees Cook
2019-08-08 22:33 ` Andrew Morton
2019-08-08 23:09 ` Kees Cook
2019-08-09 9:00 ` Catalin Marinas
2019-08-09 9:28 ` Dave Martin
2019-07-25 13:50 ` [PATCH v6 0/2] arm64 relaxed ABI Vincenzo Frascino
2019-07-25 13:50 ` [PATCH v6 1/2] arm64: Define Documentation/arm64/tagged-address-abi.rst Vincenzo Frascino
2019-07-30 10:32 ` Kevin Brodsky
2019-07-30 13:25 ` Vincenzo Frascino
2019-07-30 13:57 ` Kevin Brodsky
2019-07-30 14:24 ` Vincenzo Frascino
2019-07-30 14:48 ` Kevin Brodsky
2019-07-31 16:43 ` Dave Hansen
2019-08-02 10:08 ` Catalin Marinas [this message]
2019-07-25 13:50 ` [PATCH v6 2/2] arm64: Relax Documentation/arm64/tagged-pointers.rst Vincenzo Frascino
2019-07-31 16:50 ` [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Dave Hansen
2019-08-01 12:11 ` Kevin Brodsky
2019-08-01 12:48 ` Andrey Konovalov
2019-08-01 15:36 ` Dave Hansen
2019-08-02 10:20 ` Catalin Marinas
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