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Date: Thu, 8 Oct 2020 08:49:28 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Borislav Petkov <bp@...en8.de> Cc: linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org, Michael Matz <matz@...e.de>, Dave Jiang <dave.jiang@...el.com>, Borislav Petkov <bp@...e.de>, Tony Luck <tony.luck@...el.com>, x86 <x86@...nel.org>, hjl.tools@...il.com, linux-toolchains@...r.kernel.org Subject: Re: [tip: x86/pasid] x86/asm: Carve out a generic movdir64b() helper for general usage On Wed, Oct 07, 2020 at 11:13:27PM +0200, Borislav Petkov wrote: > On Wed, Oct 07, 2020 at 07:08:35PM +0200, Peter Zijlstra wrote: > > (%rdx), %rax, surely? > > Right, later. Already tagged the branch so that Vinod can base stuff ontop. > > > Also, that's a horrible convention, but I suppose (%rdx), (%rax) was > > out? > > See the end of this mail: > > https://lkml.kernel.org/r/alpine.LSU.2.20.2009241356020.20802@wotan.suse.de That, 100x that. Why wasn't it fixed then? How about we fix binutils to accept the sane mnemonic as well? > > Can we pretty please get a binutils version that knows about this > > instruction, such that we know when we can get rid of the silly .byte > > encoded mess? > > It looks like support for this insn got introduced in this binutils commit: > > c0a30a9f0ab4 ("Enable Intel MOVDIRI, MOVDIR64B instructions") > > So I guess from 2.31 onwards: Then we'll just keep the byte code around until we reach the min binutils that's sane, but at least we can fix the comment to not be insane.
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