From patchwork Fri Apr 12 08:42:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13627269 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 577D3C04FF6 for ; Fri, 12 Apr 2024 08:47:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=NBQTq5/iOCrWLNQTAxRuEq8gGp2Rqetx3Frm+0eAvUE=; b=ccALT4zn4bch7b bxj59C/w85UiHGFDdvySW4HYs1THcJ42e8lCJpBW3uhyi3iG8LXjtzrj22pfhhyTKohHrMDYDCW9c 6MGMGLGRy0ywXVO4T7R5Hc1NpkWHu0436Peb1Q184jB+Pqantl51Hn3hitepZBkYdH/yyG5Jlm+EI fiIaIg1j3aECzRKqnD75b1ERgRO8Hqg/crT6EG6xdMIr+xDFkJVf0MnQ1lFI1UVlaEIIDPZkw/VdX ePcaLVKucXz5wV/RxJdugWHcXh79BKD3lAGjmUXPYZTcqjlCu3dzJ+UnFIXCIOs5CkVCVLUGX/uv4 6QKCgsvuprFRiReRRGqA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rvCZF-0000000GAWc-1x5f; Fri, 12 Apr 2024 08:47:29 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rvCWQ-0000000G8iz-0Jh6 for linux-arm-kernel@lists.infradead.org; Fri, 12 Apr 2024 08:44:35 +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 E2D5614BF; Fri, 12 Apr 2024 01:45:02 -0700 (PDT) Received: from e112269-lin.cambridge.arm.com (e112269-lin.cambridge.arm.com [10.1.194.51]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 86B0F3F6C4; Fri, 12 Apr 2024 01:44:31 -0700 (PDT) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni Subject: [PATCH v2 32/43] arm_pmu: Provide a mechanism for disabling the physical IRQ Date: Fri, 12 Apr 2024 09:42:58 +0100 Message-Id: <20240412084309.1733783-33-steven.price@arm.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240412084309.1733783-1-steven.price@arm.com> References: <20240412084056.1733704-1-steven.price@arm.com> <20240412084309.1733783-1-steven.price@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240412_014434_240436_A44B1412 X-CRM114-Status: GOOD ( 12.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Arm CCA assigns the physical PMU device to the guest running in realm world, however the IRQs are routed via the host. To enter a realm guest while a PMU IRQ is pending it is necessary to block the physical IRQ to prevent an immediate exit. Provide a mechanism in the PMU driver for KVM to control the physical IRQ. Signed-off-by: Steven Price --- drivers/perf/arm_pmu.c | 15 +++++++++++++++ include/linux/perf/arm_pmu.h | 1 + 2 files changed, 16 insertions(+) diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index 8458fe2cebb4..1e024acc98bb 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -735,6 +735,21 @@ static int arm_perf_teardown_cpu(unsigned int cpu, struct hlist_node *node) return 0; } +void arm_pmu_set_phys_irq(bool enable) +{ + int cpu = get_cpu(); + struct arm_pmu *pmu = per_cpu(cpu_armpmu, cpu); + int irq; + + irq = armpmu_get_cpu_irq(pmu, cpu); + if (irq && !enable) + per_cpu(cpu_irq_ops, cpu)->disable_pmuirq(irq); + else if (irq && enable) + per_cpu(cpu_irq_ops, cpu)->enable_pmuirq(irq); + + put_cpu(); +} + #ifdef CONFIG_CPU_PM static void cpu_pm_pmu_setup(struct arm_pmu *armpmu, unsigned long cmd) { diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h index b3b34f6670cf..fd5e2e63b7fb 100644 --- a/include/linux/perf/arm_pmu.h +++ b/include/linux/perf/arm_pmu.h @@ -168,6 +168,7 @@ void kvm_host_pmu_init(struct arm_pmu *pmu); #endif bool arm_pmu_irq_is_nmi(void); +void arm_pmu_set_phys_irq(bool enable); /* Internal functions only for core arm_pmu code */ struct arm_pmu *armpmu_alloc(void);