* Re: [RFC 9/9] x86/mm: Implement PR_SET/GET_TAGGED_ADDR_CTRL with LAM
[not found] ` <20210205151631.43511-11-kirill.shutemov@linux.intel.com>
@ 2021-02-05 15:42 ` H.J. Lu
2021-02-07 8:07 ` Dmitry Vyukov
0 siblings, 1 reply; 4+ messages in thread
From: H.J. Lu @ 2021-02-05 15:42 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Dave Hansen, Andy Lutomirski, Peter Zijlstra,
the arch/x86 maintainers, Andrey Ryabinin, Alexander Potapenko,
Dmitry Vyukov, Catalin Marinas, Will Deacon, Andi Kleen,
Linux-MM, LKML, GNU C Library, GCC Development
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
--
H.J.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [RFC 9/9] x86/mm: Implement PR_SET/GET_TAGGED_ADDR_CTRL with LAM
2021-02-05 15:42 ` [RFC 9/9] x86/mm: Implement PR_SET/GET_TAGGED_ADDR_CTRL with LAM H.J. Lu
@ 2021-02-07 8:07 ` Dmitry Vyukov
2021-02-07 14:09 ` Kirill A. Shutemov
0 siblings, 1 reply; 4+ messages in thread
From: Dmitry Vyukov @ 2021-02-07 8:07 UTC (permalink / raw)
To: H.J. Lu
Cc: Kirill A. Shutemov, Dave Hansen, Andy Lutomirski, Peter Zijlstra,
the arch/x86 maintainers, Andrey Ryabinin, Alexander Potapenko,
Catalin Marinas, Will Deacon, Andi Kleen, Linux-MM, LKML,
GNU C Library, GCC Development
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?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [RFC 9/9] x86/mm: Implement PR_SET/GET_TAGGED_ADDR_CTRL with LAM
2021-02-07 8:07 ` Dmitry Vyukov
@ 2021-02-07 14:09 ` Kirill A. Shutemov
2021-02-07 14:11 ` Dmitry Vyukov
0 siblings, 1 reply; 4+ messages in thread
From: Kirill A. Shutemov @ 2021-02-07 14:09 UTC (permalink / raw)
To: Dmitry Vyukov
Cc: H.J. Lu, Kirill A. Shutemov, Dave Hansen, Andy Lutomirski,
Peter Zijlstra, the arch/x86 maintainers, Andrey Ryabinin,
Alexander Potapenko, Catalin Marinas, Will Deacon, Andi Kleen,
Linux-MM, LKML, GNU C Library, GCC Development
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.
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [RFC 9/9] x86/mm: Implement PR_SET/GET_TAGGED_ADDR_CTRL with LAM
2021-02-07 14:09 ` Kirill A. Shutemov
@ 2021-02-07 14:11 ` Dmitry Vyukov
0 siblings, 0 replies; 4+ messages in thread
From: Dmitry Vyukov @ 2021-02-07 14:11 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: H.J. Lu, Kirill A. Shutemov, Dave Hansen, Andy Lutomirski,
Peter Zijlstra, the arch/x86 maintainers, Andrey Ryabinin,
Alexander Potapenko, Catalin Marinas, Will Deacon, Andi Kleen,
Linux-MM, LKML, GNU C Library, GCC Development
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.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-02-07 14:11 UTC | newest]
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[not found] ` <20210205151631.43511-11-kirill.shutemov@linux.intel.com>
2021-02-05 15:42 ` [RFC 9/9] x86/mm: Implement PR_SET/GET_TAGGED_ADDR_CTRL with LAM H.J. Lu
2021-02-07 8:07 ` Dmitry Vyukov
2021-02-07 14:09 ` Kirill A. Shutemov
2021-02-07 14:11 ` Dmitry Vyukov
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