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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 39546C3F2CD for ; Fri, 28 Feb 2020 21:47:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 015AC246A8 for ; Fri, 28 Feb 2020 21:47:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="JHb/wjcz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726658AbgB1Vru (ORCPT ); Fri, 28 Feb 2020 16:47:50 -0500 Received: from mail.skyhub.de ([5.9.137.197]:40118 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726046AbgB1Vru (ORCPT ); Fri, 28 Feb 2020 16:47:50 -0500 Received: from zn.tnic (p200300EC2F08460085C27F132DF541F6.dip0.t-ipconnect.de [IPv6:2003:ec:2f08:4600:85c2:7f13:2df5:41f6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 581061EC0273; Fri, 28 Feb 2020 22:47:48 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1582926468; 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: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=KAekNbpydsrWNM0VycDBvsuED4RKjUysHUmbFrTNoE4=; b=JHb/wjczOVtUjNcbrSqW1jF8NXoV4d5nMXMq/nJhPmEaZrLh4f5uANXD/Rs3pUnjw602Ti itP4idDjFWy+H/zrrtRARZ1rVUbouG5VhZ8DWfWuJVXL3Wt2dN3aE/rMOoy3yTP+PHwLPm RqEtlxcXw/kVh/nm37kKoLMZkaW53+8= Date: Fri, 28 Feb 2020 22:47:42 +0100 From: Borislav Petkov To: Yu-cheng Yu Cc: linux-kernel@vger.kernel.org, x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , Dave Hansen , Tony Luck , Andy Lutomirski , Rik van Riel , "Ravi V. Shankar" , Sebastian Andrzej Siewior , Fenghua Yu , Peter Zijlstra Subject: Re: [PATCH v2 8/8] x86/fpu/xstate: Restore supervisor xstates for __fpu__restore_sig() Message-ID: <20200228214742.GF25261@zn.tnic> References: <20200221175859.GL25747@zn.tnic> <77f3841a92df5d0c819699ee3612118d566b7445.camel@intel.com> <20200228121724.GA25261@zn.tnic> <89bcab262d6dad4c08c4a21e522796fea2320db3.camel@intel.com> <20200228162359.GC25261@zn.tnic> <6f91699c91f9ea0f527e80ed3ea2999444a8d2d1.camel@intel.com> <20200228172202.GD25261@zn.tnic> <9a283ad42da140d73de680b1975da142e62e016e.camel@intel.com> <20200228183131.GE25261@zn.tnic> <7c6560b067436e2ec52121bba6bff64833e28d8d.camel@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <7c6560b067436e2ec52121bba6bff64833e28d8d.camel@intel.com> 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 Fri, Feb 28, 2020 at 01:22:39PM -0800, Yu-cheng Yu wrote: > The code is for sigreturn only. Because of lazy-restore, > copy_xregs_to_kernel() does not happen all the time. What does "not all the time" mean? You need to quantify this more precisely. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette