From: Catalin Marinas <catalin.marinas@arm.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>,
Andrey Konovalov <andreyknvl@google.com>,
linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org,
dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org,
linux-media@vger.kernel.org, kvm@vger.kernel.org,
linux-kselftest@vger.kernel.org,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will.deacon@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kees Cook <keescook@chromium.org>,
Yishai Hadas <yishaih@mellanox.com>,
Felix Kuehling <Felix.Kuehling@amd.com>,
Alexander Deucher <Alexander.Deucher@amd.com>,
Christian Koenig <Christian.Koenig@amd.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Jens Wiklander <jens.wiklander@linaro.org>,
Alex Williamson <alex.williamson@redhat.com>,
Leon Romanovsky <leon@kernel.org>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
Dave Martin <Dave.Martin@arm.com>,
Khalid Aziz <khalid.aziz@oracle.com>, enh <enh@google.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
Christoph Hellwig <hch@infradead.org>,
Dmitry Vyukov <dvyukov@google.com>,
Kostya Serebryany <kcc@google.com>,
Evgeniy Stepanov <eugenis@google.com>,
Lee Smith <Lee.Smith@arm.com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Jacob Bramley <Jacob.Bramley@arm.com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
Szabolcs Nagy <Szabolcs.Nagy@arm.com>
Subject: Re: [PATCH v19 02/15] arm64: Introduce prctl() options to control the tagged user addresses ABI
Date: Fri, 2 Aug 2019 11:50:38 +0100 [thread overview]
Message-ID: <20190802105038.GC4175@arrakis.emea.arm.com> (raw)
In-Reply-To: <88c59d1e-eda9-fcfe-5ee3-64a331f34313@intel.com>
On Thu, Aug 01, 2019 at 09:45:05AM -0700, Dave Hansen wrote:
> On 8/1/19 5:38 AM, Kevin Brodsky wrote:
> > This patch series only changes what is allowed or not at the syscall
> > interface. It does not change the address space size. On arm64, TBI (Top
> > Byte Ignore) has always been enabled for userspace, so it has never been
> > possible to use the upper 8 bits of user pointers for addressing.
>
> Oh, so does the address space that's available already chop that out?
Yes. Currently the hardware only supports 52-bit virtual addresses. It
could be expanded (though it needs a 5th page table level) to 56-bit VA
but it's not currently on our (hardware) plans. Beyond 56-bit, it cannot
be done without breaking the software expectations (and hopefully I'll
retire before we need this ;)).
> > If other architectures were to support a similar functionality, then I
> > agree that a common and more generic interface (if needed) would be
> > helpful, but as it stands this is an arm64-specific prctl, and on arm64
> > the address tag is defined by the architecture as bits [63:56].
>
> It should then be an arch_prctl(), no?
I guess you just want renaming SET_TAGGED_ADDR_CTRL() to
arch_prctl_tagged_addr_ctrl_set()? (similarly for 'get')
--
Catalin
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
kvm@vger.kernel.org, Szabolcs Nagy <Szabolcs.Nagy@arm.com>,
Will Deacon <will.deacon@arm.com>,
dri-devel@lists.freedesktop.org, linux-mm@kvack.org,
Khalid Aziz <khalid.aziz@oracle.com>,
linux-kselftest@vger.kernel.org,
Felix Kuehling <Felix.Kuehling@amd.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Jacob Bramley <Jacob.Bramley@arm.com>,
Leon Romanovsky <leon@kernel.org>,
linux-rdma@vger.kernel.org, amd-gfx@lists.freedesktop.org,
Christoph Hellwig <hch@infradead.org>,
Jason Gunthorpe <jgg@ziepe.ca>,
Dmitry Vyukov <dvyukov@google.com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Dave Martin <Dave.Martin@arm.com>,
Evgeniy Stepanov <eugenis@google.com>,
linux-media@vger.kernel.org, Kees Cook <keescook@chromium.org>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
Andrey Konovalov <andreyknvl@google.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Alex Williamson <alex.williamson@redhat.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Kostya Serebryany <kcc@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Yishai Hadas <yishaih@mellanox.com>,
linux-kernel@vger.kernel.org,
Jens Wiklander <jens.wiklander@linaro.org>,
Lee Smith <Lee.Smith@arm.com>,
Alexander Deucher <Alexander.Deucher@amd.com>,
Andrew Morton <akpm@linux-foundation.org>, enh <enh@google.com>,
Robin Murphy <robin.murphy@arm.com>,
Christian Koenig <Christian.Koenig@amd.com>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Subject: Re: [PATCH v19 02/15] arm64: Introduce prctl() options to control the tagged user addresses ABI
Date: Fri, 2 Aug 2019 11:50:38 +0100 [thread overview]
Message-ID: <20190802105038.GC4175@arrakis.emea.arm.com> (raw)
In-Reply-To: <88c59d1e-eda9-fcfe-5ee3-64a331f34313@intel.com>
On Thu, Aug 01, 2019 at 09:45:05AM -0700, Dave Hansen wrote:
> On 8/1/19 5:38 AM, Kevin Brodsky wrote:
> > This patch series only changes what is allowed or not at the syscall
> > interface. It does not change the address space size. On arm64, TBI (Top
> > Byte Ignore) has always been enabled for userspace, so it has never been
> > possible to use the upper 8 bits of user pointers for addressing.
>
> Oh, so does the address space that's available already chop that out?
Yes. Currently the hardware only supports 52-bit virtual addresses. It
could be expanded (though it needs a 5th page table level) to 56-bit VA
but it's not currently on our (hardware) plans. Beyond 56-bit, it cannot
be done without breaking the software expectations (and hopefully I'll
retire before we need this ;)).
> > If other architectures were to support a similar functionality, then I
> > agree that a common and more generic interface (if needed) would be
> > helpful, but as it stands this is an arm64-specific prctl, and on arm64
> > the address tag is defined by the architecture as bits [63:56].
>
> It should then be an arch_prctl(), no?
I guess you just want renaming SET_TAGGED_ADDR_CTRL() to
arch_prctl_tagged_addr_ctrl_set()? (similarly for 'get')
--
Catalin
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
kvm@vger.kernel.org, Szabolcs Nagy <Szabolcs.Nagy@arm.com>,
Will Deacon <will.deacon@arm.com>,
dri-devel@lists.freedesktop.org, linux-mm@kvack.org,
Khalid Aziz <khalid.aziz@oracle.com>,
linux-kselftest@vger.kernel.org,
Felix Kuehling <Felix.Kuehling@amd.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Jacob Bramley <Jacob.Bramley@arm.com>,
Leon Romanovsky <leon@kernel.org>,
linux-rdma@vger.kernel.org, amd-gfx@lists.freedesktop.org,
Christoph Hellwig <hch@infradead.org>,
Jason Gunthorpe <jgg@ziepe.ca>,
Dmitry Vyukov <dvyukov@google.com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Dave Martin <Dave.Martin@arm.com>,
Evgeniy Stepanov <eugenis@google.com>,
linux-media@vger.kernel.org, Kees Cook <keescook@chromium.org>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
Andrey Konovalov <andreyknvl@google.com>, Kevin Brodsky <kevi>
Subject: Re: [PATCH v19 02/15] arm64: Introduce prctl() options to control the tagged user addresses ABI
Date: Fri, 2 Aug 2019 11:50:38 +0100 [thread overview]
Message-ID: <20190802105038.GC4175@arrakis.emea.arm.com> (raw)
In-Reply-To: <88c59d1e-eda9-fcfe-5ee3-64a331f34313@intel.com>
On Thu, Aug 01, 2019 at 09:45:05AM -0700, Dave Hansen wrote:
> On 8/1/19 5:38 AM, Kevin Brodsky wrote:
> > This patch series only changes what is allowed or not at the syscall
> > interface. It does not change the address space size. On arm64, TBI (Top
> > Byte Ignore) has always been enabled for userspace, so it has never been
> > possible to use the upper 8 bits of user pointers for addressing.
>
> Oh, so does the address space that's available already chop that out?
Yes. Currently the hardware only supports 52-bit virtual addresses. It
could be expanded (though it needs a 5th page table level) to 56-bit VA
but it's not currently on our (hardware) plans. Beyond 56-bit, it cannot
be done without breaking the software expectations (and hopefully I'll
retire before we need this ;)).
> > If other architectures were to support a similar functionality, then I
> > agree that a common and more generic interface (if needed) would be
> > helpful, but as it stands this is an arm64-specific prctl, and on arm64
> > the address tag is defined by the architecture as bits [63:56].
>
> It should then be an arch_prctl(), no?
I guess you just want renaming SET_TAGGED_ADDR_CTRL() to
arch_prctl_tagged_addr_ctrl_set()? (similarly for 'get')
--
Catalin
next prev parent reply other threads:[~2019-08-02 10:50 UTC|newest]
Thread overview: 175+ 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 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` 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 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 02/15] arm64: Introduce prctl() options to control the tagged user addresses ABI Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-31 17:05 ` Dave Hansen
2019-07-31 17:05 ` Dave Hansen
2019-07-31 17:05 ` Dave Hansen
2019-08-01 12:38 ` Kevin Brodsky
2019-08-01 12:38 ` Kevin Brodsky
2019-08-01 12:38 ` Kevin Brodsky
2019-08-01 16:45 ` Dave Hansen
2019-08-01 16:45 ` Dave Hansen
2019-08-01 16:45 ` Dave Hansen
2019-08-02 10:50 ` Catalin Marinas [this message]
2019-08-02 10:50 ` Catalin Marinas
2019-08-02 10:50 ` Catalin Marinas
2019-08-09 16:08 ` Catalin Marinas
2019-08-09 16:08 ` 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 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 04/15] mm: untag user pointers passed to memory syscalls Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-08-09 16:03 ` Catalin Marinas
2019-08-09 16:03 ` Catalin Marinas
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 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` 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 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` 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 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 08/15] userfaultfd: untag user pointers Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 09/15] drm/amdgpu: " Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` 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 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 11/15] IB/mlx4: untag user pointers in mlx4_get_umem_mr Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-24 19:25 ` Jason Gunthorpe
2019-07-24 19:25 ` Jason Gunthorpe
2019-07-24 19:25 ` Jason Gunthorpe
2019-07-25 11:17 ` Andrey Konovalov
2019-07-25 11:17 ` Andrey Konovalov
2019-07-25 11:17 ` Andrey Konovalov
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 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` 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 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` 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 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` 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 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 17:58 ` Andrey Konovalov
2019-07-23 18:03 ` [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-07-23 18:03 ` Andrey Konovalov
2019-07-23 18:03 ` Andrey Konovalov
2019-07-23 18:03 ` Andrey Konovalov
2019-07-24 14:02 ` Will Deacon
2019-07-24 14:02 ` Will Deacon
2019-07-24 14:02 ` Will Deacon
2019-07-24 14:02 ` Will Deacon
2019-07-24 14:16 ` Andrey Konovalov
2019-07-24 14:16 ` Andrey Konovalov
2019-07-24 14:16 ` Andrey Konovalov
2019-07-24 14:16 ` Andrey Konovalov
2019-07-24 14:20 ` Will Deacon
2019-07-24 14:20 ` Will Deacon
2019-07-24 14:20 ` Will Deacon
2019-07-24 14:20 ` Will Deacon
2019-07-24 17:12 ` Vincenzo Frascino
2019-07-24 17:12 ` Vincenzo Frascino
2019-07-24 17:12 ` Vincenzo Frascino
2019-07-24 17:12 ` Vincenzo Frascino
2019-08-06 17:13 ` Will Deacon
2019-08-06 17:13 ` Will Deacon
2019-08-06 17:13 ` Will Deacon
2019-08-06 17:13 ` Will Deacon
2019-08-07 17:17 ` Andrey Konovalov
2019-08-07 17:17 ` Andrey Konovalov
2019-08-07 17:17 ` Andrey Konovalov
2019-08-07 17:17 ` Andrey Konovalov
2019-08-08 21:12 ` Kees Cook
2019-08-08 21:12 ` Kees Cook
2019-08-08 21:12 ` Kees Cook
2019-08-08 21:12 ` Kees Cook
2019-08-08 22:33 ` Andrew Morton
2019-08-08 22:33 ` Andrew Morton
2019-08-08 22:33 ` Andrew Morton
2019-08-08 22:33 ` Andrew Morton
2019-08-08 23:09 ` Kees Cook
2019-08-08 23:09 ` Kees Cook
2019-08-08 23:09 ` Kees Cook
2019-08-08 23:09 ` Kees Cook
2019-08-09 9:00 ` Catalin Marinas
2019-08-09 9:00 ` Catalin Marinas
2019-08-09 9:00 ` Catalin Marinas
2019-08-09 9:00 ` Catalin Marinas
2019-08-09 9:28 ` Dave Martin
2019-08-09 9:28 ` Dave Martin
2019-08-09 9:28 ` Dave Martin
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 ` Vincenzo Frascino
2019-07-25 13:50 ` [PATCH v6 1/2] arm64: Define Documentation/arm64/tagged-address-abi.rst Vincenzo Frascino
2019-07-25 13:50 ` Vincenzo Frascino
2019-07-30 10:32 ` Kevin Brodsky
2019-07-30 10:32 ` Kevin Brodsky
2019-07-30 13:25 ` Vincenzo Frascino
2019-07-30 13:25 ` Vincenzo Frascino
2019-07-30 13:57 ` Kevin Brodsky
2019-07-30 13:57 ` Kevin Brodsky
2019-07-30 14:24 ` Vincenzo Frascino
2019-07-30 14:24 ` Vincenzo Frascino
2019-07-30 14:48 ` Kevin Brodsky
2019-07-30 14:48 ` Kevin Brodsky
2019-07-31 16:43 ` Dave Hansen
2019-07-31 16:43 ` Dave Hansen
2019-08-02 10:08 ` Catalin Marinas
2019-08-02 10:08 ` Catalin Marinas
2019-07-25 13:50 ` [PATCH v6 2/2] arm64: Relax Documentation/arm64/tagged-pointers.rst Vincenzo Frascino
2019-07-25 13:50 ` Vincenzo Frascino
2019-07-31 16:50 ` [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Dave Hansen
2019-07-31 16:50 ` Dave Hansen
2019-07-31 16:50 ` Dave Hansen
2019-08-01 12:11 ` Kevin Brodsky
2019-08-01 12:11 ` Kevin Brodsky
2019-08-01 12:11 ` Kevin Brodsky
2019-08-01 12:48 ` Andrey Konovalov
2019-08-01 12:48 ` Andrey Konovalov
2019-08-01 12:48 ` Andrey Konovalov
2019-08-01 12:48 ` Andrey Konovalov
2019-08-01 15:36 ` Dave Hansen
2019-08-01 15:36 ` Dave Hansen
2019-08-01 15:36 ` Dave Hansen
2019-08-01 15:36 ` Dave Hansen
2019-08-02 10:20 ` Catalin Marinas
2019-08-02 10:20 ` Catalin Marinas
2019-08-02 10:20 ` Catalin Marinas
2019-08-02 10:20 ` Catalin Marinas
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