From patchwork Fri Oct 4 15:27:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13822820 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 92920CF8853 for ; Fri, 4 Oct 2024 17:09:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=3/mXj7fsmVKWVuRHWenFPaQOmuxvjIyAIe6paDxx0vc=; b=KyUlMHc0EEz1QpoCVD3wq9Gj5u fna8wrPCJN6xPT+S+rcI857zj0Fm3SB9y4G46Jhpwyu2jBxvvL4ec+1PwOER1v7uIam/SCWdNKuBa LKblUe4mnW6cAtpEPBNZVPv2ljsbfuRsDcl+MDiZ064GQFCGJdSyZkrqRRAR+dULMISQsY+hXeT7t R0gjvjAsJNYlUBSLbafjFQ+9dfuXUV1NunfvFOXjGQpfD2luQ1jw4Wk+NjX2WWSvc8DbAg54LPQlb klfbiNodWkE/i60iacRUqVnrAm7h401I00OTmWPPAAKdRx+YfFqpzbu+l1AsC0ohu2TxLzJvzvvPl SlXTSiRw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1swloL-0000000DQ2G-2twj; Fri, 04 Oct 2024 17:09:49 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1swkGS-0000000D0ZP-29Im for linux-arm-kernel@lists.infradead.org; Fri, 04 Oct 2024 15:30:45 +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 7C2FE150C; Fri, 4 Oct 2024 08:31:13 -0700 (PDT) Received: from e122027.cambridge.arm.com (unknown [10.1.25.25]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BE2103F640; Fri, 4 Oct 2024 08:30:39 -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 , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" Subject: [PATCH v5 32/43] arm_pmu: Provide a mechanism for disabling the physical IRQ Date: Fri, 4 Oct 2024 16:27:53 +0100 Message-Id: <20241004152804.72508-33-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241004152804.72508-1-steven.price@arm.com> References: <20241004152804.72508-1-steven.price@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241004_083044_613681_728CB215 X-CRM114-Status: GOOD ( 12.86 ) 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 --- v3: Add a dummy function for the !CONFIG_ARM_PMU case. --- drivers/perf/arm_pmu.c | 15 +++++++++++++++ include/linux/perf/arm_pmu.h | 5 +++++ 2 files changed, 20 insertions(+) diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index 398cce3d76fc..2cdcdda8f638 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 4b5b83677e3f..6c2631e2cbd7 100644 --- a/include/linux/perf/arm_pmu.h +++ b/include/linux/perf/arm_pmu.h @@ -172,6 +172,7 @@ 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); @@ -182,6 +183,10 @@ void armpmu_free_irq(int irq, int cpu); #define ARMV8_PMU_PDEV_NAME "armv8-pmu" +#else /* CONFIG_ARM_PMU */ + +static inline void arm_pmu_set_phys_irq(bool enable) {} + #endif /* CONFIG_ARM_PMU */ #define ARMV8_SPE_PDEV_NAME "arm,spe-v1"