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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 2D155C2D0DB for ; Thu, 30 Jan 2020 13:29:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0353F22522 for ; Thu, 30 Jan 2020 13:29:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580390958; bh=CbHPtKyFMFA04kYNssF+KSdsLNo857UpAUH3+sLYGIA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=aS2dc5b/y498L794ydnopCj2UT7JV0+wzktSNl46v1nLsiBBpYbpvHOGd+OJjkNhF b47dFL5dEs4pH+ajiBldIWbs1sj4ncGyDJfhV0+YPgu8E7R3N8jwQTO7BQ9aHS59fT 6/eCVCc+UoYsuhb8wicQd9FrQZTNQRZ9QBb8Ux2U= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727389AbgA3N3R (ORCPT ); Thu, 30 Jan 2020 08:29:17 -0500 Received: from mail.kernel.org ([198.145.29.99]:48064 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727132AbgA3N3Q (ORCPT ); Thu, 30 Jan 2020 08:29:16 -0500 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 88289214DB; Thu, 30 Jan 2020 13:29:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580390955; bh=CbHPtKyFMFA04kYNssF+KSdsLNo857UpAUH3+sLYGIA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=le+aD9REqLdsgjil37xhXT7cIq94yWkXuMK0l2vqeDcxZ4U+P4XEbCgAVccrgY4SJ CjHBxbQeMN11XGhs749HXQMnOQBlzOKl+i9xX04CVijrKcdnq1+4s9i24hKB71rEeT ABjHUkpK9P/J9ANynN9AnAo3ztYxWfeWtbf7NE40= Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ix9pv-002BmW-Gq; Thu, 30 Jan 2020 13:26:23 +0000 From: Marc Zyngier To: Paolo Bonzini Cc: Alexandru Elisei , Andrew Jones , Andrew Murray , Beata Michalska , Christoffer Dall , Eric Auger , Gavin Shan , Haibin Wang , James Morse , Mark Brown , Mark Rutland , Russell King , Shannon Zhao , Steven Price , Will Deacon , YueHaibing , Zenghui Yu , Julien Thierry , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH 14/23] arm64: KVM: Add UAPI notes for swapped registers Date: Thu, 30 Jan 2020 13:25:49 +0000 Message-Id: <20200130132558.10201-15-maz@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200130132558.10201-1-maz@kernel.org> References: <20200130132558.10201-1-maz@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: pbonzini@redhat.com, alexandru.elisei@arm.com, drjones@redhat.com, andrew.murray@arm.com, beata.michalska@linaro.org, christoffer.dall@arm.com, eric.auger@redhat.com, gshan@redhat.com, wanghaibin.wang@huawei.com, james.morse@arm.com, broonie@kernel.org, mark.rutland@arm.com, rmk+kernel@armlinux.org.uk, shannon.zhao@linux.alibaba.com, steven.price@arm.com, will@kernel.org, yuehaibing@huawei.com, yuzenghui@huawei.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Andrew Jones Two UAPI system register IDs do not derive their values from the ARM system register encodings. This is because their values were accidentally swapped. As the IDs are API, they cannot be changed. Add WARNING notes to point them out. Suggested-by: Marc Zyngier Signed-off-by: Andrew Jones [maz: turned XXX into WARNING] Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20200120130825.28838-1-drjones@redhat.com --- Documentation/virt/kvm/api.txt | 9 +++++++++ arch/arm64/include/uapi/asm/kvm.h | 12 ++++++++++-- 2 files changed, 19 insertions(+), 2 deletions(-) diff --git a/Documentation/virt/kvm/api.txt b/Documentation/virt/kvm/api.txt index ebb37b34dcfc..3a0c819c3573 100644 --- a/Documentation/virt/kvm/api.txt +++ b/Documentation/virt/kvm/api.txt @@ -2196,6 +2196,15 @@ arm64 CCSIDR registers are demultiplexed by CSSELR value: arm64 system registers have the following id bit patterns: 0x6030 0000 0013 +WARNING: + Two system register IDs do not follow the specified pattern. These + are KVM_REG_ARM_TIMER_CVAL and KVM_REG_ARM_TIMER_CNT, which map to + system registers CNTV_CVAL_EL0 and CNTVCT_EL0 respectively. These + two had their values accidentally swapped, which means TIMER_CVAL is + derived from the register encoding for CNTVCT_EL0 and TIMER_CNT is + derived from the register encoding for CNTV_CVAL_EL0. As this is + API, it must remain this way. + arm64 firmware pseudo-registers have the following bit pattern: 0x6030 0000 0014 diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 820e5751ada7..ba85bb23f060 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -220,10 +220,18 @@ struct kvm_vcpu_events { #define KVM_REG_ARM_PTIMER_CVAL ARM64_SYS_REG(3, 3, 14, 2, 2) #define KVM_REG_ARM_PTIMER_CNT ARM64_SYS_REG(3, 3, 14, 0, 1) -/* EL0 Virtual Timer Registers */ +/* + * EL0 Virtual Timer Registers + * + * WARNING: + * KVM_REG_ARM_TIMER_CVAL and KVM_REG_ARM_TIMER_CNT are not defined + * with the appropriate register encodings. Their values have been + * accidentally swapped. As this is set API, the definitions here + * must be used, rather than ones derived from the encodings. + */ #define KVM_REG_ARM_TIMER_CTL ARM64_SYS_REG(3, 3, 14, 3, 1) -#define KVM_REG_ARM_TIMER_CNT ARM64_SYS_REG(3, 3, 14, 3, 2) #define KVM_REG_ARM_TIMER_CVAL ARM64_SYS_REG(3, 3, 14, 0, 2) +#define KVM_REG_ARM_TIMER_CNT ARM64_SYS_REG(3, 3, 14, 3, 2) /* KVM-as-firmware specific pseudo-registers */ #define KVM_REG_ARM_FW (0x0014 << KVM_REG_ARM_COPROC_SHIFT) -- 2.20.1