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=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 57950CA90AF for ; Wed, 13 May 2020 13:53:33 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 999F72054F for ; Wed, 13 May 2020 13:53:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="F56N+sGv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 999F72054F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=6FsT3Xv3fh2ls35QX268wby/9BXcxTiPJGnwIE5kMJc=; b=F56N+sGvYWbuxS eyB1CwXlbSXVef0DOUM26LSYT2vgB+TNbUBx52ifE0T6EIEuCWLtMDpEa1PTbRn2FbL5mCAmC/167 /C+Y3FZTitMZi0vAruDJlidPQ9dMmlhRH0IYDUMbSTu3HavHYK5mTd4mb5w5kvO+DkRKMvJ4+T+Ea AFLlhWu8zMZA5FwlyaFZO8To1EsuEce5wEBl/kc2tLgzxYqPZoekd2glpOgpAjON63LsFKht0dYCF ZIfLJ8ND5EzBzk0EfME0oQGFBol3/CtdC0Bc0L10dC86fXDn43qp59A0ddKeZhqil6w1IW0bUgwYD UBIr1WPNF2nKyBHBp4VA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jYrpE-0000Dn-Br; Wed, 13 May 2020 13:53:32 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jYrp9-0000Ct-PM for linux-arm-kernel@lists.infradead.org; Wed, 13 May 2020 13:53:29 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 029931FB; Wed, 13 May 2020 06:53:27 -0700 (PDT) Received: from arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1CF543F71E; Wed, 13 May 2020 06:53:26 -0700 (PDT) Date: Wed, 13 May 2020 14:53:24 +0100 From: Dave Martin To: "Michael Kerrisk (man-pages)" Subject: Re: [PATCH 10/14] prctl.2: Add PR_SPEC_INDIRECT_BRANCH for SPECULATION_CTRL prctls Message-ID: <20200513135323.GO21779@arm.com> References: <1589301419-24459-1-git-send-email-Dave.Martin@arm.com> <1589301419-24459-11-git-send-email-Dave.Martin@arm.com> <20200513114915.GL21779@arm.com> <604879eb-1c7e-d08b-a6b8-165e4259b60c@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <604879eb-1c7e-d08b-a6b8-165e4259b60c@gmail.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200513_065327_914930_F5CD452B X-CRM114-Status: GOOD ( 25.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, linux-man@vger.kernel.org, Thomas Gleixner , Tim Chen , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gV2VkLCBNYXkgMTMsIDIwMjAgYXQgMDI6MDY6MzhQTSArMDIwMCwgTWljaGFlbCBLZXJyaXNr IChtYW4tcGFnZXMpIHdyb3RlOgo+IE9uIDUvMTMvMjAgMTo0OSBQTSwgRGF2ZSBNYXJ0aW4gd3Jv dGU6Cj4gPiBPbiBXZWQsIE1heSAxMywgMjAyMCBhdCAwMToyMToxMlBNICswMjAwLCBNaWNoYWVs IEtlcnJpc2sgKG1hbi1wYWdlcykgd3JvdGU6Cj4gPj4gSGVsbG8gRGF2ZSwKPiA+Pgo+ID4+IE9u IDUvMTIvMjAgNjozNiBQTSwgRGF2ZSBNYXJ0aW4gd3JvdGU6Cj4gPj4+IEFkZCB0aGUgUFJfU1BF Q19JTkRJUkVDVF9CUkFOQ0ggIm1pc2ZlYXR1cmUiIGFkZGVkIGluIExpbnV4IDQuMjAKPiA+Pj4g Zm9yIFBSX1NFVF9TUEVDVUxBVElPTl9DVFJMIGFuZCBQUl9HRVRfU1BFQ1VMQVRJT05fQ1RSTC4K PiA+Pj4KPiA+Pj4gU2lnbmVkLW9mZi1ieTogRGF2ZSBNYXJ0aW4gPERhdmUuTWFydGluQGFybS5j b20+Cj4gPj4+IENjOiBUaW0gQ2hlbiA8dGltLmMuY2hlbkBsaW51eC5pbnRlbC5jb20+Cj4gPj4+ IENjOiBUaG9tYXMgR2xlaXhuZXIgPHRnbHhAbGludXRyb25peC5kZT4KPiA+Pgo+ID4+IFRoYW5r cy4gUGF0Y2ggYXBwbGllZCwgYnV0IG5vdCB5ZXQgcHVzaGVkIHdoaWxlIEkgd2FpdCB0byBzZWUg aWYgYW55Cj4gPj4gUmV2aWV3L0FjayBhcnJpdmVzLgo+ID4+Cj4gPj4gQWxzbywgY291bGQgeW91 IHBsZWFzZSBjaGVjayB0aGUgdHdlYWtzIEkgbm90ZSBiZWxvdy4KPiA+Pgo+ID4+PiAtLS0KPiA+ Pj4gIG1hbjIvcHJjdGwuMiB8IDI0ICsrKysrKysrKysrKysrKysrKy0tLS0tLQo+ID4+PiAgMSBm aWxlIGNoYW5nZWQsIDE4IGluc2VydGlvbnMoKyksIDYgZGVsZXRpb25zKC0pCj4gPj4+Cj4gPj4+ IGRpZmYgLS1naXQgYS9tYW4yL3ByY3RsLjIgYi9tYW4yL3ByY3RsLjIKPiA+Pj4gaW5kZXggZThl YWY5NS4uNjY0MTdjZiAxMDA2NDQKPiA+Pj4gLS0tIGEvbWFuMi9wcmN0bC4yCj4gPj4+ICsrKyBi L21hbjIvcHJjdGwuMgo+ID4+PiBAQCAtMTIxMywxMSArMTIxMywyMCBAQCBhcmd1bWVudHMgbXVz dCBiZSBzcGVjaWZpZWQgYXMgMDsgb3RoZXJ3aXNlIHRoZSBjYWxsIGZhaWxzIHdpdGggdGhlIGVy cm9yCj4gPj4+ICAuXCIgY29tbWl0IDM1NmU0YmZmZjJjNTQ4OWUwMTZmZGI5MjVhZGJmMTJhMWUz OTUwZWUKPiA+Pj4gIFNldHMgdGhlIHN0YXRlIG9mIHRoZSBzcGVjdWxhdGlvbiBtaXNmZWF0dXJl IHNwZWNpZmllZCBpbgo+ID4+PiAgLklSIGFyZzIgLgo+ID4+PiAtQ3VycmVudGx5LCB0aGUgb25s eSBwZXJtaXR0ZWQgdmFsdWUgZm9yIHRoaXMgYXJndW1lbnQgaXMKPiA+Pj4gK0N1cnJlbnRseSwg dGhpcyBhcmd1bWVudCBtdXN0IGJlIG9uZSBvZjoKPiA+Pj4gKy5SUwo+ID4+PiArLlRQCj4gPj4+ ICAuQiBQUl9TUEVDX1NUT1JFX0JZUEFTUwo+ID4+PiAtKG90aGVyd2lzZSB0aGUgY2FsbCBmYWls cyB3aXRoIHRoZSBlcnJvcgo+ID4+PiArc3BlY3VsYXRpdmUgc3RvcmUgYnlwYXNzIGNvbnRyb2ws IG9yCj4gPj4KPiA+PiBzL3NwZWN1bGF0aXZlL2VuYWJsZSBzcGVjdWxhdGl2ZS8KPiA+Pgo+ID4+ PiArLlwiIGNvbW1pdCA5MTM3YmIyN2U2MGU1NTRkYWI2OTRlYWZhNGNjYTI0MWZhM2E2OTRmCj4g Pj4+ICsuVFAKPiA+Pj4gKy5CUiBQUl9TUEVDX0lORElSRUNUX0JSQU5DSCAiIChzaW5jZSBMaW51 eCA0LjIwKSIKPiA+Pj4gK2luZGlyZWN0IGJyYW5jaCBzcGVjdWxhdGlvbiBjb250cm9sLgo+ID4+ Cj4gPj4gcy9pbmRpcmVjdC9lbmFibGUgaW5kaXJlY3QvCj4gPiAKPiA+IFRoYXQgZG9lc24ndCBz ZWVtIHF1aXRlIHJpZ2h0Lgo+IAo+IE15IGdvb2YsIG5vdCBsb29raW5nIGF0IHRoZSBiaWdnZXIg Y29udGV4dCBvZiB0aGUgcGF0Y2guCj4gCj4gPiAKPiA+IGFyZzIganVzdCBpZGVudGlmaWVzIHdo YXQgYmVoYXZpb3VyIHRvIGNvbmZpZ3VyZS4KPiA+IEl0J3MgYXJnMyB0aGF0IHNheXMgd2hldGhl ciB0byBkaXNhYmxlIC8gZW5hYmxlIGl0IG9yIHdoYXRldmVyLgo+ID4gCj4gPiAKPiA+IFdoaWxl IGVkaXRpbmcgdGhpcyBJIGRpZCB3b25kZXIgd2hldGhlciB0aGUgImNvbnRyb2wiIHdhcyBoZWxw ZnVsLgo+ID4gTWF5YmUganVzdCBkcm9wcGluZyB0aGF0IHdvcmQgZnJvbSB0aGVzZSBlbnRyaWVz IHdvdWxkIGhlbHAuCj4gCj4gT2theSBJIHRyaWVkIHRvIGZpeCB0aGluZ3MsIGFuZCBtYWRlIGFs c28gc29tZSBvdGhlciBlZGl0cy4KPiBIb3cgZG9lcyB0aGUgZm9sbG93aW5nIGxvb2sgdG8geW91 Pwo+IAo+ICAgICAgIFBSX1NFVF9TUEVDVUxBVElPTl9DVFJMIChzaW5jZSBMaW51eCA0LjE3KQo+ ICAgICAgICAgICAgICAgU2V0cyB0aGUgc3RhdGUgb2YgdGhlIHNwZWN1bGF0aW9uIG1pc2ZlYXR1 cmUgIHNwZWNpZmllZCAgaW4KPiAgICAgICAgICAgICAgIGFyZzIuICAgVGhlICBzcGVjdWxhdGlv bi1taXNmZWF0dXJlIHNldHRpbmdzIGFyZSBwZXItdGhyZWFkCj4gICAgICAgICAgICAgICBhdHRy aWJ1dGVzLgo+IAo+ICAgICAgICAgICAgICAgQ3VycmVudGx5LCBhcmcyIG11c3QgYmUgb25lIG9m Ogo+IAo+ICAgICAgICAgICAgICAgUFJfU1BFQ19TVE9SRV9CWVBBU1MKPiAgICAgICAgICAgICAg ICAgICAgICBTZXQgdGhlIHN0YXRlIG9mIHRoZSBzcGVjdWxhdGl2ZSBzdG9yZSAgYnlwYXNzICBt aXPigJAKPiAgICAgICAgICAgICAgICAgICAgICBmZWF0dXJlLgo+IAo+ICAgICAgICAgICAgICAg UFJfU1BFQ19JTkRJUkVDVF9CUkFOQ0ggKHNpbmNlIExpbnV4IDQuMjApCj4gICAgICAgICAgICAg ICAgICAgICAgU2V0ICB0aGUgIHN0YXRlICBvZiAgdGhlIGluZGlyZWN0IGJyYW5jaCBzcGVjdWxh dGlvbgo+ICAgICAgICAgICAgICAgICAgICAgIG1pc2ZlYXR1cmUuCj4gCj4gICAgICAgICAgICAg ICBJZiBhcmcyIGRvZXMgbm90IGhhdmUgb25lIG9mIHRoZSAgYWJvdmUgIHZhbHVlcywgIHRoZW4g IHRoZQo+ICAgICAgICAgICAgICAgY2FsbCBmYWlscyB3aXRoIHRoZSBlcnJvciBFTk9ERVYuCj4g Cj4gICAgICAgICAgICAgICBUaGUgIGFyZzMgIGFyZ3VtZW50ICBpcyAgdXNlZCB0byBoYW5kIGlu IHRoZSBjb250cm9sIHZhbHVlLAo+ICAgICAgICAgICAgICAgd2hpY2ggaXMgb25lIG9mIHRoZSBm b2xsb3dpbmc6Cj4gCj4gICAgICAgICAgICAgICAuLi4KCkxvb2sgT0sgdG8gbWUuCgpJIHRob3Vn aHQgaXQgc291bmRlZCBvZGQgdG8gInNldCB0aGUgc3RhdGUiIG9mIGEgc2lsaWNvbiBidWcsIGJ1 dCB0aGF0CndhcyBhIGJvZ3VzIGNvbmNlcm4uCgpUaGlzIGlzbid0IGFib3V0IGJ1Z3MsIGJ1dCBp bnRlbnRpb25hbCwgb2Z0ZW4gY29uZmlndXJhYmxlIGJlaGF2aW91cnMgaW4KdGhlIHNpbGljb24g dGhhdCBoYXBwZW4gdG8gaGF2ZSBoYXJtZnVsIHNpZGUgZWZmZWN0cy4KCkl0IGNvdWxkIGJlIG1v cmUgdGVyc2UgdG8gc2F5ICJjb25maWd1cmUiIGluc3RlYWQgb2YgInNldCB0aGUgc3RhdGUgb2Yi LApidXQgZWl0aGVyIHdheSB3b3JrcyBmb3IgbWUuCgpDaGVlcnMKLS0tRGF2ZQoKX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBt YWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9s aXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=