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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT 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 151CEC10F12 for ; Mon, 15 Apr 2019 18:46:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D172C218D3 for ; Mon, 15 Apr 2019 18:46:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555353988; bh=Eb4rEwUZ6RXNtzNjbG+XVZsj6T3Gm4TRFGCWKXhEZf4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GWrU5WmcTZz1VqTJFm4MbaR0ZQch39iexgeLKpEvlr7M04ZPIc+jww3C6O68pKsHh DTYLZeyS7wptqm0TZVMukPn061kYCz+Ep/6qkKBUB4ZRgt3OTGtKY/Ka5T9txxbmAa 3AOHi//MBjj1OOvupsxJwoZeYEoTD+g7EK2IUI20= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728614AbfDOSq2 (ORCPT ); Mon, 15 Apr 2019 14:46:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:49144 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728589AbfDOSqZ (ORCPT ); Mon, 15 Apr 2019 14:46:25 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7179D2073F; Mon, 15 Apr 2019 18:46:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555353985; bh=Eb4rEwUZ6RXNtzNjbG+XVZsj6T3Gm4TRFGCWKXhEZf4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=x3aHBzkdIUyN5Qem/mhT780VhJAHNzBPpsMK+kFSq+G5RJcCy6pUU+w0DyfpXrRYU tn0qlpyE12fPz4LpqOorxsdRIzbFrpaIPe/wn8emiiVgW8zeDxQP0J9fqZja1/MREh fZvb+VlAVEPuhmd1Fgl4WdOZw7KVK7pOPaUu4Pqc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Michael Ellerman , Sasha Levin Subject: [PATCH 4.9 28/76] powerpc/64s: Add new security feature flags for count cache flush Date: Mon, 15 Apr 2019 20:43:52 +0200 Message-Id: <20190415183715.164988720@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190415183707.712011689@linuxfoundation.org> References: <20190415183707.712011689@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org commit dc8c6cce9a26a51fc19961accb978217a3ba8c75 upstream. Add security feature flags to indicate the need for software to flush the count cache on context switch, and for the presence of a hardware assisted count cache flush. Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin --- arch/powerpc/include/asm/security_features.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/powerpc/include/asm/security_features.h b/arch/powerpc/include/asm/security_features.h index 44989b22383c..a0d47bc18a5c 100644 --- a/arch/powerpc/include/asm/security_features.h +++ b/arch/powerpc/include/asm/security_features.h @@ -59,6 +59,9 @@ static inline bool security_ftr_enabled(unsigned long feature) // Indirect branch prediction cache disabled #define SEC_FTR_COUNT_CACHE_DISABLED 0x0000000000000020ull +// bcctr 2,0,0 triggers a hardware assisted count cache flush +#define SEC_FTR_BCCTR_FLUSH_ASSIST 0x0000000000000800ull + // Features indicating need for Spectre/Meltdown mitigations @@ -74,6 +77,9 @@ static inline bool security_ftr_enabled(unsigned long feature) // Firmware configuration indicates user favours security over performance #define SEC_FTR_FAVOUR_SECURITY 0x0000000000000200ull +// Software required to flush count cache on context switch +#define SEC_FTR_FLUSH_COUNT_CACHE 0x0000000000000400ull + // Features enabled by default #define SEC_FTR_DEFAULT \ -- 2.19.1