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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4D4AEC433F5 for ; Wed, 9 Mar 2022 06:57:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230168AbiCIG6Y (ORCPT ); Wed, 9 Mar 2022 01:58:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229501AbiCIG6W (ORCPT ); Wed, 9 Mar 2022 01:58:22 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id CF9B5161129 for ; Tue, 8 Mar 2022 22:57:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1646809043; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=uQZVhMRBRFZnnKX2zkJLC/T4eTixzo4LpDh1ov3v/B8=; b=WLWkIvBAmgGcYfmTSW0ZN/wwRriFlkVfcNsEZ4lluzWdZL+bYTgwIwGOkFER1NLVveVYvl s06BhZ6r5V2033THJIQUVvfZZkZeyzkJC7eBwI7I9x2rEfYpCz7X2R6aU4ilYXnQav/dSS s6GoEAb2w8afkorzVaMF2kXrcfi6dsE= Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-108-i36aYWzJO2O6ufpasZajLw-1; Wed, 09 Mar 2022 01:57:23 -0500 X-MC-Unique: i36aYWzJO2O6ufpasZajLw-1 Received: by mail-io1-f69.google.com with SMTP id w25-20020a6bd619000000b00640ddd0ad11so1196294ioa.2 for ; Tue, 08 Mar 2022 22:57:22 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=uQZVhMRBRFZnnKX2zkJLC/T4eTixzo4LpDh1ov3v/B8=; b=UBj9JxFae6nQpgEAm2PUzPvOe/g515CA/BgdOf2HzPz0Wtld05W8rf/LFrfHsaWB4C I41XMHuLMKvRMwpjhoYYxBPTawQZ6T9WIBFTfHaExtfLwXY6BgqY2Npb4q9qiObY43mW UQvDvK9PYyUjWLfoGQr/sKnEI+B1Jg1e80aeilHM6zvnqVA007icticXXVqrJVRMau/8 dMBP83kRVVQE3jWPJMjuMVSaTEGmEMzq+aucrwOLMh8ta0nLuzPbfxjbMCNpe6UXANw4 R3+iPw+0eHubgiP9hLv75nqG+debuygON/FpHEE1e/dcXlw2JUmzKXWr27BnRuK1dZeE yA7w== X-Gm-Message-State: AOAM532zfjXCxpntWhofdU8mCClwlvwijrWw0/+hKa4+4TSCidBGrFuh zX545/zDPFP6kfDvASyY1g95pV2vO+yoyaTT8VvQqnYfFvqkvU7bLkJluSO1uquqGd7cmFXNNd2 zEx0DcTGT2PVzmuohYUw1ZFCE X-Received: by 2002:a02:782b:0:b0:317:ddef:fa78 with SMTP id p43-20020a02782b000000b00317ddeffa78mr4607889jac.226.1646809042187; Tue, 08 Mar 2022 22:57:22 -0800 (PST) X-Google-Smtp-Source: ABdhPJydiT/IcXzAEqQoDSaZupQDRdDRXGP1/vSHgDFZUSQ1ZWy+U3Vctkw+exsRQ+dmuJJRMFgHcA== X-Received: by 2002:a02:782b:0:b0:317:ddef:fa78 with SMTP id p43-20020a02782b000000b00317ddeffa78mr4607877jac.226.1646809041893; Tue, 08 Mar 2022 22:57:21 -0800 (PST) Received: from treble ([2600:1700:6e32:6c00::35]) by smtp.gmail.com with ESMTPSA id m7-20020a056e02158700b002c61541edd7sm671684ilu.3.2022.03.08.22.57.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Mar 2022 22:57:21 -0800 (PST) Date: Tue, 8 Mar 2022 22:57:18 -0800 From: Josh Poimboeuf To: Peter Zijlstra Cc: x86@kernel.org, joao@overdrivepizza.com, hjl.tools@gmail.com, andrew.cooper3@citrix.com, linux-kernel@vger.kernel.org, ndesaulniers@google.com, keescook@chromium.org, samitolvanen@google.com, mark.rutland@arm.com, alyssa.milburn@intel.com, mbenes@suse.cz, rostedt@goodmis.org, mhiramat@kernel.org, alexei.starovoitov@gmail.com Subject: Re: [PATCH v4 00/45] x86: Kernel IBT Message-ID: <20220309065718.e4k2el2mlqn23yh2@treble> References: <20220308153011.021123062@infradead.org> <20220308200614.gyhp657bdq3rxapl@treble> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20220308200614.gyhp657bdq3rxapl@treble> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 08, 2022 at 12:06:18PM -0800, Josh Poimboeuf wrote: > As talked about on IRC there are still a few outstanding issues, that > I'm fine with fixing after the merge window during the upcoming -next > cycle: > > - xen hypercall page functions need 'ret' - (I think you already fixed) > > - why don't unreachables need to fill up the entire sym hole? > > - get rid of the 'c_file' hack > > - improve cmdline option intuitive-ness > > - properly integrate the retpoline "demotion" with the new Spectre BHI > related patches - probably still needs more discussion - for example > we might instead want to disable IBT and warn One more: - Changing objtool should force a vmlinux re-link. -- Josh