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=-11.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 0B675C43457 for ; Sat, 17 Oct 2020 03:32:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8331520789 for ; Sat, 17 Oct 2020 03:32:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8331520789 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BA7DF6B005D; Fri, 16 Oct 2020 23:32:08 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B33AC900002; Fri, 16 Oct 2020 23:32:08 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A1F276B0068; Fri, 16 Oct 2020 23:32:08 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0063.hostedemail.com [216.40.44.63]) by kanga.kvack.org (Postfix) with ESMTP id 6C0D56B005D for ; Fri, 16 Oct 2020 23:32:08 -0400 (EDT) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id E0C95362C for ; Sat, 17 Oct 2020 03:32:07 +0000 (UTC) X-FDA: 77379993894.06.aunt48_5d1583827222 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin06.hostedemail.com (Postfix) with ESMTP id BB7B4102631DF for ; Sat, 17 Oct 2020 03:32:07 +0000 (UTC) X-HE-Tag: aunt48_5d1583827222 X-Filterd-Recvd-Size: 4318 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by imf35.hostedemail.com (Postfix) with ESMTP for ; Sat, 17 Oct 2020 03:32:06 +0000 (UTC) IronPort-SDR: TeQ05z7meXlN1oaEo2WmoG44BiDsHKfhNlWmqZksUjuzXSrMSbV9UMj048F017JYnIsJKPYDDY oYIxDN0gs4LA== X-IronPort-AV: E=McAfee;i="6000,8403,9776"; a="146041664" X-IronPort-AV: E=Sophos;i="5.77,385,1596524400"; d="scan'208";a="146041664" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2020 20:32:03 -0700 IronPort-SDR: kvyfzP2MmHEewAuij6J97fqoPkF27+6ntcl4pUo67Y0ey7WhiD8GVW1pnB6mjR8DSQp0w+kBVn R3ZScB5JlEAA== X-IronPort-AV: E=Sophos;i="5.77,385,1596524400"; d="scan'208";a="521393708" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2020 20:32:03 -0700 Date: Fri, 16 Oct 2020 20:32:03 -0700 From: Ira Weiny To: Peter Zijlstra Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Andy Lutomirski , Fenghua Yu , x86@kernel.org, Dave Hansen , Dan Williams , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH RFC V3 2/9] x86/fpu: Refactor arch_set_user_pkey_access() for PKS support Message-ID: <20201017033202.GV2046448@iweiny-DESK2.sc.intel.com> References: <20201009194258.3207172-1-ira.weiny@intel.com> <20201009194258.3207172-3-ira.weiny@intel.com> <20201016105743.GK2611@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201016105743.GK2611@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.11.1 (2018-12-01) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Oct 16, 2020 at 12:57:43PM +0200, Peter Zijlstra wrote: > On Fri, Oct 09, 2020 at 12:42:51PM -0700, ira.weiny@intel.com wrote: > > From: Fenghua Yu > > > > Define a helper, update_pkey_val(), which will be used to support both > > Protection Key User (PKU) and the new Protection Key for Supervisor > > (PKS) in subsequent patches. > > > > Co-developed-by: Ira Weiny > > Signed-off-by: Ira Weiny > > Signed-off-by: Fenghua Yu > > --- > > arch/x86/include/asm/pkeys.h | 2 ++ > > arch/x86/kernel/fpu/xstate.c | 22 ++++------------------ > > arch/x86/mm/pkeys.c | 21 +++++++++++++++++++++ > > 3 files changed, 27 insertions(+), 18 deletions(-) > > This is not from Fenghua. > > https://lkml.kernel.org/r/20200717085442.GX10769@hirez.programming.kicks-ass.net > > This is your patch based on the code I wrote. Ok, I apologize. Yes the code below was all yours. Is it ok to add? Co-developed-by: Peter Zijlstra Signed-off-by: Peter Zijlstra ? Thanks, Ira > > > diff --git a/arch/x86/mm/pkeys.c b/arch/x86/mm/pkeys.c > > index f5efb4007e74..3cf8f775f36d 100644 > > --- a/arch/x86/mm/pkeys.c > > +++ b/arch/x86/mm/pkeys.c > > @@ -208,3 +208,24 @@ static __init int setup_init_pkru(char *opt) > > return 1; > > } > > __setup("init_pkru=", setup_init_pkru); > > + > > +/* > > + * Update the pk_reg value and return it. > > + * > > + * Kernel users use the same flags as user space: > > + * PKEY_DISABLE_ACCESS > > + * PKEY_DISABLE_WRITE > > + */ > > +u32 update_pkey_val(u32 pk_reg, int pkey, unsigned int flags) > > +{ > > + int pkey_shift = pkey * PKR_BITS_PER_PKEY; > > + > > + pk_reg &= ~(((1 << PKR_BITS_PER_PKEY) - 1) << pkey_shift); > > + > > + if (flags & PKEY_DISABLE_ACCESS) > > + pk_reg |= PKR_AD_BIT << pkey_shift; > > + if (flags & PKEY_DISABLE_WRITE) > > + pk_reg |= PKR_WD_BIT << pkey_shift; > > + > > + return pk_reg; > > +} > > -- > > 2.28.0.rc0.12.gb6a658bd00c9 > >