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 > > <kirill.shutemov@xxxxxxxxxxxxxxx> 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
