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Shutemov" 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 Subject: Re: [RFC 9/9] x86/mm: Implement PR_SET/GET_TAGGED_ADDR_CTRL with LAM Message-ID: <20210207140906.hdfzorevpmiqtryd@box> References: <20210205151631.43511-1-kirill.shutemov@linux.intel.com> <20210205151631.43511-11-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 wrote: > > > > On Fri, Feb 5, 2021 at 7:16 AM Kirill A. Shutemov > > 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