From patchwork Wed Dec 12 10:29:28 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Murray X-Patchwork-Id: 10726051 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DAFC891E for ; Wed, 12 Dec 2018 10:30:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C647F2ABC0 for ; Wed, 12 Dec 2018 10:30:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B78842AC53; Wed, 12 Dec 2018 10:30:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 5D6D72ABC0 for ; Wed, 12 Dec 2018 10:30:16 +0000 (UTC) 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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: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:In-Reply-To: References:List-Owner; bh=z7jYeO69+m3u3V8ub5ef2pLwgkCH7x5MRc7b+Diqtyk=; b=Rqo Ct2KH7lLjoPhz1r/6KjtdAHBNdAr1rkzcE6DO0VLpSWJAOZ3Tmw0g0iBTZwC882dQWWi9i7oHH+gj pK7MGb3IFgWx7j+gB8zW2qVeUGfFCo9kgUh5mGqaTLNJXw3XL4//0yuafxsgHEMYB/+F/vmszN1aj d/F+FTw2yPYQqGc5S5N7AP10p82gCxnfhgCyYxWbA9XT+cB7i9vyBlDD+kiy1PMqknihjUtbbeQSv 93DA3tw0X6b4CFkacZIBPls3gD9i6ZdWoUbtl7GwcS5rT9UqD4zbWcDEXjlCS3M58YFpb4oTzIRcv qdKWtCN3ykWSUXEvwUTpaogTCoPLw4A==; 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 1gX1mI-0005XG-DP; Wed, 12 Dec 2018 10:30:06 +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 1gX1m3-0005F1-Ll for linux-arm-kernel@lists.infradead.org; Wed, 12 Dec 2018 10:29:53 +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 65E6DA78; Wed, 12 Dec 2018 02:29:40 -0800 (PST) Received: from e119886-lin.cambridge.arm.com (unknown [10.37.6.11]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7A9673F575; Wed, 12 Dec 2018 02:29:38 -0800 (PST) From: Andrew Murray To: Christoffer Dall , Marc Zyngier , Catalin Marinas , Will Deacon , Mark Rutland Subject: [PATCH v8 0/5] arm64: Support perf event modifiers :G and :H Date: Wed, 12 Dec 2018 10:29:28 +0000 Message-Id: <1544610573-28446-1-git-send-email-andrew.murray@arm.com> X-Mailer: git-send-email 2.7.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181212_022951_735750_4AAB3068 X-CRM114-Status: GOOD ( 13.41 ) 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: Suzuki K Poulose , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Julien Thierry MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This patchset provides support for perf event modifiers :G and :H which allows for filtering of PMU events between host and guests when used with KVM. As the underlying hardware cannot distinguish between guest and host context, the performance counters must be stopped and started upon entry/exit to the guest. This is performed at EL2 in a way that minimizes overhead and improves accuracy of recording events that only occur in the requested context. This has been tested with VHE and non-VHE kernels with a KVM guest. Changes from v7: - Added additional patch to encapsulate kvm_cpu_context in kvm_host_data Changes from v6: - Move events_host/events_guest out of kvm_cpu_context Changes from v5: - Tweak logic in use of kvm_set_pmu_events Changes from v4: - Prevent unnecessary write_sysreg calls by improving __pmu_switch_to_xxx logic. Changes from v3: - Remove confusing _only suffix from bitfields in kvm_cpu_context - Remove unnecessary condition when clearing event bits in disable - Simplify API of KVM accessors - Prevent unnecessary setting of pmcnten when guest/host events are the same. Changes from v2: - Ensured that exclude_kernel works for guest - Removed unnecessary exclusion of EL2 with exclude_host on !VHE - Renamed kvm_clr_set_host_pmu_events to reflect args order - Added additional information to isb patch Changes from v1: - Removed unnecessary exclusion of EL1 with exclude_guest on VHE - Removed unnecessary isb from existing perf_event.c driver - Folded perf_event.c patches together - Added additional information to last patch commit message Andrew Murray (5): arm64: arm_pmu: remove unnecessary isb instruction arm64: KVM: encapsulate kvm_cpu_context in kvm_host_data arm64: KVM: add accessors to track guest/host only counters arm64: arm_pmu: Add support for exclude_host/exclude_guest attributes arm64: KVM: Enable support for :G/:H perf event modifiers arch/arm/include/asm/kvm_host.h | 8 ++++-- arch/arm64/include/asm/kvm_asm.h | 4 +-- arch/arm64/include/asm/kvm_host.h | 42 +++++++++++++++++++++++++++---- arch/arm64/kernel/asm-offsets.c | 2 +- arch/arm64/kernel/perf_event.c | 52 +++++++++++++++++++++++++++++++++------ arch/arm64/kvm/hyp/switch.c | 52 +++++++++++++++++++++++++++++++++++++++ virt/kvm/arm/arm.c | 10 +++++--- 7 files changed, 148 insertions(+), 22 deletions(-)