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: 13627218 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 3B11012C47E; Fri, 12 Apr 2024 08:44:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712911475; cv=none; b=eQOeh5dlgLjhI7y8IgG4AHosQd+9F3fE6FSlSmw/zVAlH5K9WXLiFQ//sZBy4KtPqjxdTGwEAR1Tb3KA9kccNfT8hlkeuONDpKEC0EtUwjtchwl6jej4h0ONcDuXaFSSjontfkmkTec2sLan9QB6ly3SdjBl42g0VXOsg6X+rkQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712911475; c=relaxed/simple; bh=LJRHZqLpgUFHNZGkOH+yE7+yRBDI8CIMirCPstAOYYk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=jD+10XKkrY9zJrP+aoazpus4BoRaWz8CDz8CnQpc1H8H+L4PU0kJn765QmtIP1wShGJspQe8e2owiQJeSajcQ73wgDE+qgvxsvusqGrWz63U5/QapYgysGd356u8fyfgHB8FMonBfg8IGfg422kQg2BRN4fwH7nzM3II1i14Cbs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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);