From: Dmitry Vyukov <dvyukov@google.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: "H.J. Lu" <hjl.tools@gmail.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"the arch/x86 maintainers" <x86@kernel.org>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Andi Kleen <ak@linux.intel.com>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
GNU C Library <libc-alpha@sourceware.org>,
GCC Development <gcc@gcc.gnu.org>
Subject: Re: [RFC 9/9] x86/mm: Implement PR_SET/GET_TAGGED_ADDR_CTRL with LAM
Date: Sun, 7 Feb 2021 15:11:39 +0100 [thread overview]
Message-ID: <CACT4Y+ZN_9QB1q9+TakyDz5O6M735S=1qWc+nXkgn30Hy7_9gw@mail.gmail.com> (raw)
In-Reply-To: <20210207140906.hdfzorevpmiqtryd@box>
On Sun, Feb 7, 2021 at 3:09 PM Kirill A. Shutemov <kirill@shutemov.name> wrote:
>
> On Sun, Feb 07, 2021 at 09:07:02AM +0100, Dmitry Vyukov wrote:
> > On Fri, Feb 5, 2021 at 4:43 PM H.J. Lu <hjl.tools@gmail.com> wrote:
> > >
> > > On Fri, Feb 5, 2021 at 7:16 AM Kirill A. Shutemov
> > > <kirill.shutemov@linux.intel.com> wrote:
> > > >
> > > > Provide prctl() interface to enabled LAM for user addresses. Depending
> > > > how many tag bits requested it may result in enabling LAM_U57 or
> > > > LAM_U48.
> > >
> > > I prefer the alternate kernel interface based on CET arch_prctl interface which
> > > is implemented in glibc on users/intel/lam/master branch:
> > >
> > > https://gitlab.com/x86-glibc/glibc/-/tree/users/intel/lam/master
> > >
> > > and in GCC on users/intel/lam/master branch:
> > >
> > > https://gitlab.com/x86-gcc/gcc/-/tree/users/intel/lam/master
> >
> > Hi Kirill, H.J.,
> >
> > I don't have strong preference for PR_SET/GET_TAGGED_ADDR_CTRL vs
> > ARCH_X86_FEATURE_1_ENABLE itself, but tying LAM to ELF and
> > GNU_PROPERTY in the second option looks strange. LAM can be used
> > outside of ELF/GNU, right?
>
> Sure. In both cases it's still a syscall.
Oh, I meant just the naming scheme. The consts are declared in elf.h
and are prefixed with GNU_PROPERTY.
next prev parent reply other threads:[~2021-02-07 14:12 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-05 15:16 [RFC 0/9] Linear Address Masking enabling Kirill A. Shutemov
2021-02-05 15:16 ` [RFC 1/9] mm, arm64: Update PR_SET/GET_TAGGED_ADDR_CTRL interface Kirill A. Shutemov
2021-02-11 16:57 ` Catalin Marinas
2021-02-11 17:06 ` Dave Hansen
2021-02-11 18:26 ` Catalin Marinas
2021-02-05 15:16 ` [QEMU] x86: Implement Linear Address Masking support Kirill A. Shutemov
2021-02-05 15:16 ` [RFC 2/9] x86/mm: Fix CR3_ADDR_MASK Kirill A. Shutemov
2021-02-05 15:16 ` [RFC 3/9] x86: CPUID and CR3/CR4 flags for Linear Address Masking Kirill A. Shutemov
2021-02-05 15:16 ` [RFC 4/9] x86/mm: Introduce TIF_LAM_U57 and TIF_LAM_U48 Kirill A. Shutemov
2021-02-05 15:16 ` [RFC 5/9] x86/mm: Provide untagged_addr() helper Kirill A. Shutemov
2021-02-05 15:16 ` [RFC 6/9] x86/uaccess: Remove tags from the address before checking Kirill A. Shutemov
2021-02-05 15:16 ` [RFC 7/9] x86/mm: Handle tagged memory accesses from kernel threads Kirill A. Shutemov
2021-02-05 15:16 ` [RFC 8/9] x86/mm: Make LAM_U48 and mappings above 47-bits mutually exclusive Kirill A. Shutemov
2021-02-05 15:16 ` [RFC 9/9] x86/mm: Implement PR_SET/GET_TAGGED_ADDR_CTRL with LAM Kirill A. Shutemov
2021-02-05 15:42 ` H.J. Lu
2021-02-05 15:42 ` H.J. Lu
2021-02-07 8:07 ` Dmitry Vyukov
2021-02-07 8:07 ` Dmitry Vyukov
2021-02-07 14:09 ` Kirill A. Shutemov
2021-02-07 14:11 ` Dmitry Vyukov [this message]
2021-02-07 14:11 ` Dmitry Vyukov
2021-02-05 15:16 ` [QEMU] x86: Implement Linear Address Masking support Kirill A. Shutemov
2021-02-05 15:49 ` [RFC 0/9] Linear Address Masking enabling Peter Zijlstra
2021-02-05 16:01 ` Kirill A. Shutemov
2021-02-05 16:19 ` Peter Zijlstra
2021-02-07 8:24 ` Dmitry Vyukov
2021-02-07 8:24 ` Dmitry Vyukov
2021-02-07 14:11 ` Kirill A. Shutemov
2021-09-21 16:52 ` Dmitry Vyukov
2021-09-21 16:52 ` Dmitry Vyukov
2021-09-21 17:15 ` H.J. Lu
2021-09-21 17:15 ` H.J. Lu
2021-09-22 1:15 ` Zhang, Xiang1
2021-09-22 12:54 ` Dmitry Vyukov
2021-09-22 12:54 ` Dmitry Vyukov
2021-09-22 20:03 ` Dmitry Vyukov
2021-09-22 20:03 ` Dmitry Vyukov
2021-09-22 21:33 ` Kirill A. Shutemov
2021-09-23 0:15 ` H.J. Lu
2021-09-23 0:15 ` H.J. Lu
2021-09-23 5:35 ` Dmitry Vyukov
2021-09-23 5:35 ` Dmitry Vyukov
2021-09-23 0:07 ` H.J. Lu
2021-09-23 0:07 ` H.J. Lu
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