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Thu, 26 Jan 2023 09:42:09 -0500 (EST) Received: by box.shutemov.name (Postfix, from userid 1000) id C240510C9D0; Thu, 26 Jan 2023 17:42:06 +0300 (+03) Date: Thu, 26 Jan 2023 17:42:06 +0300 From: "Kirill A. Shutemov" To: Linus Torvalds Cc: "Kirill A. Shutemov" , Dave Hansen , Andy Lutomirski , Peter Zijlstra , x86@kernel.org, Kostya Serebryany , Andrey Ryabinin , Andrey Konovalov , Alexander Potapenko , Taras Madan , Dmitry Vyukov , "H . J . Lu" , Andi Kleen , Rick Edgecombe , Bharata B Rao , Jacob Pan , Ashok Raj , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCHv15 00/17] Linear Address Masking enabling Message-ID: <20230126144206.mebmtx5ku3qy6xf6@box.shutemov.name> References: <20230123220500.21077-1-kirill.shutemov@linux.intel.com> <20230124110158.bwqu3v2evoa3ffw6@box.shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230124110158.bwqu3v2evoa3ffw6@box.shutemov.name> X-Rspamd-Queue-Id: 76ABB80014 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: jccgoejokfuubqa384pdtigxyi8gui8m X-HE-Tag: 1674744133-222181 X-HE-Meta: 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 7K55o1RY b7HQLpJproSxsGeyjG00cvIVjAYyeZf2hSSbf/DRszl3CVvLqcfWYh2rmuqMzXbcrPhVLCgcnVhwTIw+BfxeOqmoUetXJYPT+Sex9+zs+fL/8o4zdhZC0dgdSWnArh7gsTm9WZtropPUPSxabwxgzWjBnlfV0zfm40PguWfztRq7a/RRh8ZDQN7bsNJ//g4fqrKbnorHqA7kVvNZc+0xL1FZZ1ehKcGYfHO0Wx2Ydv2gEQEwdepLLHWXTxC7xeJbIYo4iut5nlTRc3001+3qns9amluo4q3B/KSbCJxetcdaxpGay0QAsBFIxLxnj+GXQMeoTnhXv1I82B77NVEroKSPY+2VdrVx/L9t7fiXmFnbgoDb3cL/IwQKcmeSE0jq8uotEnYsyBwcGN/aXkDKvuMp9kA== 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 Tue, Jan 24, 2023 at 02:01:58PM +0300, Kirill A. Shutemov wrote: > On Mon, Jan 23, 2023 at 06:07:20PM -0800, Linus Torvalds wrote: > > On Mon, Jan 23, 2023 at 2:05 PM Kirill A. Shutemov > > wrote: > > > > > > Linear Address Masking[1] (LAM) modifies the checking that is applied to > > > 64-bit linear addresses, allowing software to use of the untranslated > > > address bits for metadata. > > > > > > The capability can be used for efficient address sanitizers (ASAN) > > > implementation and for optimizations in JITs and virtual machines. > > > > > > The patchset brings support for LAM for userspace addresses. Only LAM_U57 at > > > this time. > > > > I didn't react to anything objectionable in the series. > > > > My only reaction was actually to ask "when / what CPU cores are > > expected to support this feature"? > > > > Maybe it was mentioned somewhere, and I'm just blind and not finding > > it. But even the "Instruction Set Extensions and Future Features" > > paper seems to just be talking about the CPUID bits, not about any > > actual "this is when we expect it". > > There's no announced CPUs that have the feature. And it is above my pay > grade to disclose anything beyond that. I've asked around and if everything goes well it will be available early 2024. -- Kiryl Shutsemau / Kirill A. Shutemov