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=-12.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 48868C433DB for ; Fri, 19 Feb 2021 19:19:38 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 DDA6464E77 for ; Fri, 19 Feb 2021 19:19:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DDA6464E77 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+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=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=UmvlhAQYhoKcpfi2E8w5XDBkPN2LTRr55vfpTiHU8IA=; b=EaE8dnJfWmHJFKQzqKI8HpG38 KR4hl6FK1a73FMBA1f3QsBvo+YvwEYYtM0xdlWhjBAHooskTRWln/8K5GvJEtYcIunnXg9Rw2Ofrc QODDSgohKiumzDZCJa5V9y1SQO0Vtuo93Vvtp+G50IP0t/PXJBk5MlFS891nS1XRqcFubQvmHF3z4 QTDN2qJ0Au5kMHpwVe5JfubEpfX2w/4zGjXDe6OHdprS9TVN+CX5xFMzskoXi2TSAhutJP/xcUhVQ 8yOm4wVQ+50Mb+XVerW8FDg4dc7KaLJskyACoTE0/pA8oqt6sLKiBInltdIVHJFkXYR8W+pONEA+P f6/BaMjzQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1lDBHA-0005wG-0f; Fri, 19 Feb 2021 19:17:16 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1lDBH1-0005uS-Ql for linux-arm-kernel@lists.infradead.org; Fri, 19 Feb 2021 19:17:08 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0E49064E86; Fri, 19 Feb 2021 19:17:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1613762227; bh=v9jrOCMpsEdkY/0P3S+WQSC5g4c4F7J3JoYs3GGCBMs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=imjONuHlnTydVQ7biMnAr7iF3qDvjrgucxWpGYRFZ3qt/472o62IHWarjRs0xA8gX a3Oi8f6459ywUF3NjlpQ55gogSQUj5MXOlh88Z33F0JfE0bXx4OoL5SmGtuwsDlIy8 QY47Sc0AaYpZuHIre9zseGfZe7YMZnunD5mjnmAKk4I+aHKsn2a4T6BgjGrTVwmBdt J0D0h3+39Tbq+7pDijFSzGTSqzWjY8lInaOlj5VuKqu9iVCtSS/OHxQ/NJ0bXR4qfw 7ecuoBdrHGC0v/4WSd0T6BNita6wLo6l0Uq+I6rSi3q3H/PfBhDKYgWZiGSszrlW/a XSkSl6mVyWDFQ== From: Will Deacon To: Will Deacon , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2] arm64: spectre: Prevent lockdep splat on v4 mitigation enable path Date: Fri, 19 Feb 2021 19:16:56 +0000 Message-Id: <161375696575.288478.4483910605172607059.b4-ty@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210218140346.5224-1-will@kernel.org> References: <20210218140346.5224-1-will@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210219_141707_998813_0D717E89 X-CRM114-Status: GOOD ( 10.94 ) 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 , Lorenzo Pieralisi , Saravana Kannan , "Paul E . McKenney" , Peter Zijlstra , catalin.marinas@arm.com, Boqun Feng , Sami Tolvanen , Marc Zyngier , kernel-team@android.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 18 Feb 2021 14:03:46 +0000, Will Deacon wrote: > The Spectre-v4 workaround is re-configured when resuming from suspend, > as the firmware may have re-enabled the mitigation despite the user > previously asking for it to be disabled. > > Enabling or disabling the workaround can result in an undefined > instruction exception on CPUs which implement PSTATE.SSBS but only allow > it to be configured by adjusting the SPSR on exception return. We handle > this by installing an 'undef hook' which effectively emulates the access. > > [...] Applied to arm64 (for-next/fixes), thanks! [1/1] arm64: spectre: Prevent lockdep splat on v4 mitigation enable path https://git.kernel.org/arm64/c/a2c42bbabbe2 Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel