From patchwork Thu Jan 23 11:58:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Murray X-Patchwork-Id: 11347501 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6BA27139A for ; Thu, 23 Jan 2020 11:59:47 +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 4A43E20704 for ; Thu, 23 Jan 2020 11:59:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="S2SNzRHk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4A43E20704 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+patchwork-linux-arm=patchwork.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: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=U1TfYULeEljBhaqDSAr6NmdFVGuKJD45Kc61n8l6tpE=; b=S2SNzRHkR8shXt DonrU9/AKy7bfddFX8FoJMk6Oae6FTxV6sg8nisikCgc7PUFDSYtQAnSLvr1/fH2hbyiGhIruiLFP L60XzRLasGJ9uVOV6JrlgqqYOyrLaIxaKXyPme6kE6w2ruEL5h0TrMFeP9aUj4czhDJKY/2ABKdZL G4q/uleErcde4p7xre6lWdxAyaM35V/VF66zFkqo3FYV39feEfWWFAtgBQ3pz6R1hEmcnq5jIg6OL jKjhqEfMTYDybxjbbH1bJDtZAJBmhS+HYBZt8fBj+5eInXoxnVvtWAFPRoHXF0sH00ZjjOj19Y0tN 5KYNEK6RfjVTbF6rTw+w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iub9E-0000oh-VY; Thu, 23 Jan 2020 11:59:44 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iub8d-0000Nd-EG for linux-arm-kernel@lists.infradead.org; Thu, 23 Jan 2020 11:59:08 +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 3F466328; Thu, 23 Jan 2020 03:59:06 -0800 (PST) Received: from e119886-lin.cambridge.arm.com (unknown [10.37.6.20]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 42C9B3F6C4; Thu, 23 Jan 2020 03:59:04 -0800 (PST) From: Andrew Murray To: Catalin Marinas , Will Deacon , Marc Zyngier , Mark Rutland Subject: [PATCH v4 2/3] KVM: arm64: limit PMU version to ARMv8.4 Date: Thu, 23 Jan 2020 11:58:51 +0000 Message-Id: <20200123115852.55595-3-andrew.murray@arm.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200123115852.55595-1-andrew.murray@arm.com> References: <20200123115852.55595-1-andrew.murray@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200123_035907_534543_313571FB X-CRM114-Status: GOOD ( 10.03 ) X-Spam-Score: -0.7 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [217.140.110.172 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 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: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Suzuki K Poulose Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org ARMv8.5-PMU introduces 64-bit event counters, however KVM doesn't yet support this. Let's trap the Debug Feature Registers in order to limit PMUVer/PerfMon in the Debug Feature Registers to PMUv3 for ARMv8.4. Signed-off-by: Andrew Murray Reviewed-by: Suzuki K Poulose --- arch/arm64/include/asm/sysreg.h | 5 +++++ arch/arm64/kvm/sys_regs.c | 11 +++++++++++ 2 files changed, 16 insertions(+) diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index 6e919fafb43d..d969df417f88 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -672,6 +672,11 @@ #define ID_AA64DFR0_TRACEVER_SHIFT 4 #define ID_AA64DFR0_DEBUGVER_SHIFT 0 +#define ID_DFR0_PERFMON_SHIFT 24 + +#define ID_DFR0_EL1_PMUVER_8_4 5 +#define ID_AA64DFR0_EL1_PMUVER_8_4 5 + #define ID_ISAR5_RDM_SHIFT 24 #define ID_ISAR5_CRC32_SHIFT 16 #define ID_ISAR5_SHA2_SHIFT 12 diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 9f2165937f7d..028c93a88a51 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1085,6 +1085,17 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu, (0xfUL << ID_AA64ISAR1_API_SHIFT) | (0xfUL << ID_AA64ISAR1_GPA_SHIFT) | (0xfUL << ID_AA64ISAR1_GPI_SHIFT)); + } else if (id == SYS_ID_AA64DFR0_EL1) { + /* Limit guests to PMUv3 for ARMv8.4 */ + val = cpuid_feature_cap_signed_field_width(val, + ID_AA64DFR0_PMUVER_SHIFT, + 4, ID_AA64DFR0_EL1_PMUVER_8_4); + } else if (id == SYS_ID_DFR0_EL1) { + /* Limit guests to PMUv3 for ARMv8.4 */ + val = cpuid_feature_cap_signed_field_width(val, + ID_DFR0_PERFMON_SHIFT, + 4, ID_DFR0_EL1_PMUVER_8_4); + } return val;