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=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 9FF0BC433E6 for ; Thu, 31 Dec 2020 00:34:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6F969212CC for ; Thu, 31 Dec 2020 00:34:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726596AbgLaAeK (ORCPT ); Wed, 30 Dec 2020 19:34:10 -0500 Received: from mail.kernel.org ([198.145.29.99]:57034 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726540AbgLaAeI (ORCPT ); Wed, 30 Dec 2020 19:34:08 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id A0BE522227; Thu, 31 Dec 2020 00:33:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1609374807; bh=YvoZijVIuexSHAs+IQ8IRrUPZpDueM3kvQ5ZKWpPiJI=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=omcCgltDx5ErCq/0sQtz1GNADqmso4RNI28oKTSL1Hoki4/hEa5JWncgLvHtTtepx UfBtRZL/hIADf1E787YyT2rgpQpKxB0ei2Mei7ETkAI4ZEmIf2NEEda7PMzmpZguzc rP8cYaFlLq7ONbO+tjalbao4ZEZl6L7yXP1eFE/O34HxzBaWive0/I5iSI5iNRvsGp melPelPzHpQE9iBqUBmVlVfXPRoPRnIQbYuoD35NDdfpVHdpbZPPJWWfyRe4TAc2lm lVm+y44IG9+rxLZcvr9CP6Hxs+TXvx6a3+fpKqFjumlQ39Z8PBI1IBWzZ+IEOjqBOb 0I5DvRETGGfaw== Received: by mail-io1-f53.google.com with SMTP id 81so15996545ioc.13; Wed, 30 Dec 2020 16:33:27 -0800 (PST) X-Gm-Message-State: AOAM531QvtZwCTrUzRymWTTfG1kYYt7Z2O7+hXoGFcWIhsY53uBeYdEc RqbDI3a/oX0qcQGBxLhlW43D/uIuuhDN1KgFCzY= X-Google-Smtp-Source: ABdhPJyhpA3o1P+7/7e+hMYGgFckNbaoDACSne2mJpBt853SevP7XxuyDumv9fp5JoOQyQDhmXZ1BSVoSR9IedURhZU= X-Received: by 2002:a02:c9cf:: with SMTP id c15mr47817173jap.57.1609374807095; Wed, 30 Dec 2020 16:33:27 -0800 (PST) MIME-Version: 1.0 References: <20201230032314.10042-1-jiaxun.yang@flygoat.com> <20201230032314.10042-3-jiaxun.yang@flygoat.com> In-Reply-To: <20201230032314.10042-3-jiaxun.yang@flygoat.com> From: Huacai Chen Date: Thu, 31 Dec 2020 08:33:15 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 3/3] MIPS: cpu-probe: Vulnerabilities for Loongson cores To: Jiaxun Yang Cc: "open list:MIPS" , Thomas Bogendoerfer , WANG Xuerui , Alexey Malahov , Serge Semin , =?UTF-8?B?5ZGo55Cw5p2wIChaaG91IFlhbmppZSk=?= , Paul Cercueil , Tiezhu Yang , YunQiang Su , Liangliang Huang , LKML Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Jiaxun, On Wed, Dec 30, 2020 at 11:26 AM Jiaxun Yang wrote: > > Loongson64C is known to be vulnerable to meltdown according to > PoC from Rui Wang . How about Loongson-3A1000/3B1500, and Loongson-2E/2F? Huacai > > Loongson64G defended these side-channel attack by silicon. > > Signed-off-by: Jiaxun Yang > --- > arch/mips/kernel/cpu-probe.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c > index 2460783dbdb1..24b21f51353c 100644 > --- a/arch/mips/kernel/cpu-probe.c > +++ b/arch/mips/kernel/cpu-probe.c > @@ -2092,6 +2092,8 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) > c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM | > MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2); > c->ases &= ~MIPS_ASE_VZ; /* VZ of Loongson-3A2000/3000 is incomplete */ > + c->vulnerabilities |= MIPS_VULNBL_MELTDOWN; > + c->vulnerable |= MIPS_VULNBL_MELTDOWN; > break; > case PRID_IMP_LOONGSON_64G: > c->cputype = CPU_LOONGSON64; > @@ -2100,6 +2102,8 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) > set_isa(c, MIPS_CPU_ISA_M64R2); > decode_cpucfg(c); > c->writecombine = _CACHE_UNCACHED_ACCELERATED; > + c->vulnerabilities |= MIPS_VULNBL_MELTDOWN | > + MIPS_VULNBL_SPECTRE_V1 | MIPS_VULNBL_SPECTRE_V2; > break; > default: > panic("Unknown Loongson Processor ID!"); > -- > 2.30.0 >