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=-7.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,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 CE1D0C7618F for ; Mon, 22 Jul 2019 16:41:21 +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 9E2BD21901 for ; Mon, 22 Jul 2019 16:41:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="sd50zpwW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9E2BD21901 Authentication-Results: mail.kernel.org; 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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hpbNC-0000CJ-Tc; Mon, 22 Jul 2019 16:41:14 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hpbN9-0000Bj-Dn for linux-arm-kernel@lists.infradead.org; Mon, 22 Jul 2019 16:41:13 +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 4BEB728; Mon, 22 Jul 2019 09:41:08 -0700 (PDT) Received: from [10.1.197.61] (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id A72773F694; Mon, 22 Jul 2019 09:41:06 -0700 (PDT) Subject: Re: [PATCH v2] arm64: Force SSBS on context switch To: Will Deacon , Neeraj Upadhyay References: <20190722135309.43186-1-marc.zyngier@arm.com> <8c89dbc4-50ba-6802-e582-d4fe54426261@codeaurora.org> <20190722160429.wasox4nfl6t5jrew@willie-the-truck> From: Marc Zyngier Openpgp: preference=signencrypt Autocrypt: addr=marc.zyngier@arm.com; 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Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190722160429.wasox4nfl6t5jrew@willie-the-truck> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190722_094112_149134_D661C7A9 X-CRM114-Status: GOOD ( 12.51 ) 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: Mark Rutland , Catalin Marinas , linux-arm-kernel@lists.infradead.org, Anshuman Khandual Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 22/07/2019 17:04, Will Deacon wrote: > On Mon, Jul 22, 2019 at 08:28:15PM +0530, Neeraj Upadhyay wrote: >> On 7/22/19 7:23 PM, Marc Zyngier wrote: >>> +static void ssbs_thread_switch(struct task_struct *next) >>> +{ >>> + if (likely(!(next->flags & PF_KTHREAD)) && >>> + arm64_get_ssbd_state() != ARM64_SSBD_FORCE_ENABLE && >>> + !test_tsk_thread_flag(next, TIF_SSBD)) { >>> + struct pt_regs *regs = task_pt_regs(next); >>> + >>> + if (compat_user_mode(regs)) >>> + set_compat_ssbs_bit(regs); >>> + else if (user_mode(regs)) >>> + set_ssbs_bit(regs); >>> + } >>> +} >>> + >>> /* >>> * We store our current task in sp_el0, which is clobbered by userspace. Keep a >>> * shadow copy so that we can restore this upon entry from userspace. >>> @@ -471,6 +485,7 @@ __notrace_funcgraph struct task_struct *__switch_to(struct task_struct *prev, >>> entry_task_switch(next); >>> uao_thread_switch(next); >>> ptrauth_thread_switch(next); >>> + ssbs_thread_switch(next); >>> /* >>> * Complete any pending TLB or cache maintenance on this CPU in case >> >> Looks good to me. > > I inverted the logic in ssbs_thread_switch() so I could add some comments. > Please double check: > > https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/commit/?h=for-next/fixes&id=cbdf8a189a66001c36007bf0f5c975d0376c5c3a Looks good to me! Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel