From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70AF0C43441 for ; Thu, 22 Nov 2018 09:45:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2F3ED20866 for ; Thu, 22 Nov 2018 09:45:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="pjixrglp" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2F3ED20866 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393554AbeKVUYi (ORCPT ); Thu, 22 Nov 2018 15:24:38 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:56538 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387572AbeKVUYi (ORCPT ); Thu, 22 Nov 2018 15:24:38 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=nlxKCexDfinQ53v2cJbc6YlU4kK2dKSeKr4YrA6q0xs=; b=pjixrglpTj0KU/biYwq2Tt4oR CQxSy813S3hvXat5IXJuLxIza8qRO4hChoImNQaQWmt+SoyvfqJPuF/7FBAVVPtqu+4NWCdpM0Mn8 wqiGu0tSrVIv9YrwaUroWb+hJyhnYFYvmiTzp9QqfZPGtMJBnGBf4WFDvBrvgCS++ZepE8wkpBU4Y +glKTB5rD6ocevGUzAXeQXeS2gTqTNg4m09r0G2QhPDrSVHrC3wkzc4rHSs5FgPrBDqV7u/z671Qx U7QNW0KJro3eaMlIAr/SeuoZOBP8Qkfcb5Nyz54V9eQcF7Cox+xJQ986U0f08dE6kNimHjKZALyWK lQdsqQEIg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1gPlYR-0005wA-D5; Thu, 22 Nov 2018 09:45:48 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 095972029FD58; Thu, 22 Nov 2018 10:45:41 +0100 (CET) Date: Thu, 22 Nov 2018 10:45:41 +0100 From: Peter Zijlstra To: Thomas Gleixner Cc: LKML , x86@kernel.org, Andy Lutomirski , Linus Torvalds , Jiri Kosina , Tom Lendacky , Josh Poimboeuf , Andrea Arcangeli , David Woodhouse , Andi Kleen , Dave Hansen , Casey Schaufler , Asit Mallick , Arjan van de Ven , Jon Masters , Waiman Long , Greg KH , Dave Stewart , Kees Cook Subject: Re: [patch 00/24] x86/speculation: Remedy the STIBP/IBPB overhead Message-ID: <20181122094540.GL2131@hirez.programming.kicks-ass.net> References: <20181121201430.559770965@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181121201430.559770965@linutronix.de> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 21, 2018 at 09:14:30PM +0100, Thomas Gleixner wrote: > It's based on the x86/pti branch unfortunately, which contains the removal > of the minimal asm retpoline hackery. I noticed too late. If the minimal > asm stuff should not be backported it's trivial to rebase that series on > Linus tree. I see no problem with backporting those patches; the rationale for them also holds for the stable trees, people really should have a retpoline enabled compiler available by now. Also, that minimal thing provided about as much protection as thinking happy thoughts.