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=-3.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT 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 9B116C43387 for ; Mon, 14 Jan 2019 15:56:47 +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 6B0A1206B7 for ; Mon, 14 Jan 2019 15:56:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="fqSIYhS4" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6B0A1206B7 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=8FzthXa96zlPTHJCgMClxvblPXNm+UU1tdUv0GIyrqI=; b=fqSIYhS4gFtiHC IvJGtVoHFEmWEkzeCagXO3Prt7PuJC3dCv0kJHMG7GTn5v7s6Wnx0DyGHuZ+TZLJvPH4WrsChIQ4F GBlxIU/TXNReBBPVMbLEEGTD+KmqGS2U1qBbBXWyu3LOoZHz2NmnbBmDCPHsLmUIcc6lderYYlmJb nAEG0k57+pxRSTtU3FRbBS+ZNwlsEc7V4S4SJ2we8jftyWfkoopsVBJDluWlKTMKe7QQn2jBXIbY9 x8lavikDidSlglKOCmJYL87OLudoFqdli+OuyqGdlhsAF5LuqiPI+6QgXxkGLl7rYCprhN3SqkCsc sZXPWGfDAKjhY0NdOfKw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gj4bW-0000Mk-AZ; Mon, 14 Jan 2019 15:56:46 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gj4bT-0000Ln-N2 for linux-arm-kernel@lists.infradead.org; Mon, 14 Jan 2019 15:56:44 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 09D1D80D; Mon, 14 Jan 2019 07:56:40 -0800 (PST) Received: from arrakis.emea.arm.com (arrakis.cambridge.arm.com [10.1.196.113]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C85113F70D; Mon, 14 Jan 2019 07:56:37 -0800 (PST) Date: Mon, 14 Jan 2019 15:56:35 +0000 From: Catalin Marinas To: Julien Thierry Subject: Re: [PATCH v8 01/26] arm64: Fix HCR.TGE status for NMI contexts Message-ID: <20190114155634.GB84430@arrakis.emea.arm.com> References: <1546956464-48825-1-git-send-email-julien.thierry@arm.com> <1546956464-48825-2-git-send-email-julien.thierry@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1546956464-48825-2-git-send-email-julien.thierry@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190114_075643_754556_5F29BCAE X-CRM114-Status: GOOD ( 10.90 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, linux-arch@vger.kernel.org, daniel.thompson@linaro.org, Arnd Bergmann , marc.zyngier@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org, christoffer.dall@arm.com, james.morse@arm.com, joel@joelfernandes.org, linux-arm-kernel@lists.infradead.org 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 Tue, Jan 08, 2019 at 02:07:19PM +0000, Julien Thierry wrote: > When using VHE, the host needs to clear HCR_EL2.TGE bit in order > to interract with guest TLBs, switching from EL2&0 translation regime > to EL1&0. > > However, some non-maskable asynchronous event could happen while TGE is > cleared like SDEI. Because of this address translation operations > relying on EL2&0 translation regime could fail (tlb invalidation, > userspace access, ...). Why would an NMI context need to access user space? (just curious what breaks exactly without this patch; otherwise it looks fine) -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel