Received: by 2002:a25:8b91:0:0:0:0:0 with SMTP id j17csp903913ybl; Tue, 28 Jan 2020 14:33:19 -0800 (PST) X-Google-Smtp-Source: APXvYqytx2b2vKuv+TaZh/+BWz6RT19mHPoHWl05+d8/7kQyluNGyyKqUTw/6QobhbgaRYvMTF6e X-Received: by 2002:a9d:7dc9:: with SMTP id k9mr18127369otn.117.1580250799491; Tue, 28 Jan 2020 14:33:19 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1580250799; cv=none; d=google.com; s=arc-20160816; b=lWvq6qrR6TV7uQGXsjwFOdBdtHUfO8/YOQPcGddrQPFx0/UJIkBx8mbkuA/758NczB vjptqco0vS0GxgjIsgosF5M9W7suKeAvQQ9MAHEsuSuR9kg5HzipN3inu0Q5ygRGDqVI g7o211Qk4F9dH/9JepGVBRBKBpz4ybRLxJXdqcNRIaTWXWElwtmrCCzK0rYjrGkg4YHs 2OSgyl67Fbq4nS+scvmTcRA9iqLRTXrqkM/hA+OnSPx+28eZtRN04FDSamTcD2vXOvRQ NRs2lnVsjmdq9/Yhc9VjtvRV3C12U0KXq2ogOEXc0IOC0A1MU/9bZPM1/KwXCu2uu9V3 B4Ew== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-transfer-encoding:content-disposition:mime-version :references:message-id:subject:cc:to:from:date; bh=GQyumSx3pXZR7CKJx/JmfpUy9GO9jLe38EWJm0fSQSo=; b=XEIkakNtnrCuWlk+hnbgmPTSkh89BbEyW3tewAoSsTbcXxQ/aH51FiFZejt+AU+VI3 8ODl5IBWMANLtm0yO+DMoEAt474rRyxyYxFt/XoWpyB1l3cENEY2wjxE2mL5nre9LDjN KRpU6NDDMpSSWCFhJJGIikKyFYY5mgKXQOow7KCboFZjVfluWQ8n9I5W/Z6jGYwae4YD sBxQ6sU7wOxKE/gkoyLG/CoD4GgJtHgJTKYRRvBjdVETQpsmT6yZGwYUM2sNry0kquqE m9NxNUhLgdbDqZ+eT7aWKKhCwK0ZQVdmBbiczbP1z8OtDjyfnqT98urrn21OAaC1pvv8 nHGg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id w2si46911otk.126.2020.01.28.14.33.06; Tue, 28 Jan 2020 14:33:19 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726393AbgA1WbX (ORCPT + 99 others); Tue, 28 Jan 2020 17:31:23 -0500 Received: from mx2.suse.de ([195.135.220.15]:38314 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726211AbgA1WbW (ORCPT ); Tue, 28 Jan 2020 17:31:22 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 12032ADD7; Tue, 28 Jan 2020 22:31:21 +0000 (UTC) Date: Tue, 28 Jan 2020 23:31:10 +0100 From: Borislav Petkov To: Linus Torvalds , "Luck, Tony" Cc: Ingo Molnar , Linux Kernel Mailing List , Thomas Gleixner , Borislav Petkov , Peter Zijlstra , Andrew Morton Subject: Re: [GIT PULL] x86/asm changes for v5.6 Message-ID: <20200128223110.GB6787@zn.tnic> References: <20200128165906.GA67781@gmail.com> <3908561D78D1C84285E8C5FCA982C28F7F5517F9@ORSMSX114.amr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: 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 Tue, Jan 28, 2020 at 01:04:19PM -0800, Linus Torvalds wrote: > On Tue, Jan 28, 2020 at 12:41 PM Luck, Tony wrote: > > > > Is there still some easy way to get gdb to disassemble from /dev/kmem > > to see what we ended up with after all the patching? > > Hmm. No, I think it's all gone. > > It _used_ to be easy to just do "objdump --disassemble /proc/kcore" as > root, but I think we've broken that long ago. Either booting with "debug-alternative" on baremetal or starting a guest and stopping it with gdb and examining the patched memory is what I've been using to hack on the alternatives in past years. Guest won't help you a whole lot with FSRM but you could "force it", for example. -- Regards/Gruss, Boris. SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg