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=-4.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 4144FC43381 for ; Tue, 26 Mar 2019 03:55:55 +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 101F120811 for ; Tue, 26 Mar 2019 03:55:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="UWapYC2c" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 101F120811 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-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=SgZUb6kx4a87WWesq60GWiQM3fKfzeElJTcqEscBAyM=; b=UWapYC2cAId3jbmOg30Y9YwmB caGXjV21tBEuyXBcDk+eSyHLL1V3VTGZGIYH+RuOJlcSwYGO4t+jFIWKsJ44ToMTwqOblXzTx7ZmT wWYyHjHnN/OX3ta8DjX/vix0fxTP+w4gaLcTtWOU+zHOllxsoCX8X3AM51uOqC6pi7EAa/2yVWdsz s9UsorCeUqK/XI2uFXU2Jb9kGY+a/IbzucMT01j1TfvoDBPiY/1TtSpM7OfjpyvD3a/RmxsYlaMqj SsrUhdrmNKklyizTEZWjkJuQxedYaRiTZd3JBIN5DzWJ+ozdfUOEEQskepof4eLd3j78qWle7IGWJ GxVcvmShg==; 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 1h8dBl-0007Mr-5q; Tue, 26 Mar 2019 03:55:49 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h8dBh-0007M9-O3 for linux-arm-kernel@lists.infradead.org; Tue, 26 Mar 2019 03:55:47 +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 9CEC180D; Mon, 25 Mar 2019 20:55:42 -0700 (PDT) Received: from [10.162.0.144] (a075553-lin.blr.arm.com [10.162.0.144]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D6F353F59C; Mon, 25 Mar 2019 20:55:38 -0700 (PDT) Subject: Re: [PATCH v7 5/10] KVM: arm/arm64: preserve host MDCR_EL2 value To: Kristina Martsenko , linux-arm-kernel@lists.infradead.org References: <1552984243-7689-1-git-send-email-amit.kachhap@arm.com> <1552984243-7689-6-git-send-email-amit.kachhap@arm.com> <19c2bdb3-6917-286e-3f2a-35fd71f69f51@arm.com> From: Amit Daniel Kachhap Message-ID: Date: Tue, 26 Mar 2019 09:25:36 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <19c2bdb3-6917-286e-3f2a-35fd71f69f51@arm.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190325_205545_793760_2E1984E0 X-CRM114-Status: GOOD ( 15.33 ) 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 , Andrew Jones , Julien Thierry , Marc Zyngier , Catalin Marinas , Will Deacon , Christoffer Dall , kvmarm@lists.cs.columbia.edu, James Morse , Ramana Radhakrishnan , Dave Martin , linux-kernel@vger.kernel.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On 3/26/19 1:34 AM, Kristina Martsenko wrote: > On 19/03/2019 08:30, Amit Daniel Kachhap wrote: >> Save host MDCR_EL2 value during kvm HYP initialisation and restore >> after every switch from host to guest. There should not be any >> change in functionality due to this. >> >> The value of mdcr_el2 is now stored in struct kvm_cpu_context as >> both host and guest can now use this field in a common way. >> >> Signed-off-by: Amit Daniel Kachhap >> Acked-by: Mark Rutland >> Cc: Marc Zyngier >> Cc: Mark Rutland >> Cc: Christoffer Dall >> Cc: kvmarm@lists.cs.columbia.edu > > [...] > >> /** >> - * kvm_arm_init_debug - grab what we need for debug >> - * >> - * Currently the sole task of this function is to retrieve the initial >> - * value of mdcr_el2 so we can preserve MDCR_EL2.HPMN which has >> - * presumably been set-up by some knowledgeable bootcode. >> - * >> - * It is called once per-cpu during CPU hyp initialisation. >> - */ >> - >> -void kvm_arm_init_debug(void) >> -{ >> - __this_cpu_write(mdcr_el2, kvm_call_hyp_ret(__kvm_get_mdcr_el2)); >> -} > > The __kvm_get_mdcr_el2 function is no longer used anywhere, so can also > be removed. Nice catch. Will do. Thanks, Amit D > > Thanks, > Kristina > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel