From patchwork Tue Dec 17 21:20:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Upton X-Patchwork-Id: 13912529 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 0A24EE7717F for ; Tue, 17 Dec 2024 21:29:02 +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=YE2j3A4NxVRVl2GQB2DLusxN7V/Z1D1qyrpkRyZqAjs=; b=St2uqj2/0IMMUsqa2VYQg4WHzU 6tmGhub+3Fpo5cBpJIvxBSIsVwJhgfvptqnNNp0d9QAmdsoR46vs7o8mkBRFkUdYF8XJHjN6Mk2C5 /8dsxsvnj6INkpkET1DIrgQMDL1o4VOclRNLJKAKv6aAEBXfg+Sv2XL07yzREW4dT9vzaTDB0L5JB k2T+iXgU5b2wbaNGEBWW2TnjaS8ODDKcAAC4BVWBtzs93X8TVutakdvHWfUpB9nWj1/blR5dSZ5sm SnuEkX1PaVZL33MjnpmoAyP3TC67SfWM/fJoDZSwt8RC7MbdvvIbhWURujGd4GwQfcUD8XcGeyPGm Rr18aqlw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tNf7d-0000000Erru-0125; Tue, 17 Dec 2024 21:28:53 +0000 Received: from out-186.mta1.migadu.com ([2001:41d0:203:375::ba]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tNf0J-0000000EqUd-351e for linux-arm-kernel@lists.infradead.org; Tue, 17 Dec 2024 21:21:21 +0000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1734470476; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YE2j3A4NxVRVl2GQB2DLusxN7V/Z1D1qyrpkRyZqAjs=; b=VUCz9OE/AV2KcJ4J/cF5KXrOcr3hPjieyyL33kZUsPDz3yA0S+1ZyfYmkt57QMq55xiumt 2F+dSum7cm/lECcbmlUGO6V3W5MyrylY4OZ19GHhM8/0JzSCzI8rnwAvzElEsh7+UzTBfw U3AvPtw0WbCp9WJejotPzL1AE5lyWyc= From: Oliver Upton To: kvmarm@lists.linux.dev Cc: Marc Zyngier , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Mingwei Zhang , Colton Lewis , Raghavendra Rao Ananta , Catalin Marinas , Will Deacon , Mark Rutland , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Oliver Upton Subject: [PATCH 06/18] KVM: arm64: Always support SW_INCR PMU event Date: Tue, 17 Dec 2024 13:20:36 -0800 Message-Id: <20241217212048.3709204-7-oliver.upton@linux.dev> In-Reply-To: <20241217212048.3709204-1-oliver.upton@linux.dev> References: <20241217212048.3709204-1-oliver.upton@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241217_132119_914582_C5B43E3A X-CRM114-Status: UNSURE ( 8.35 ) X-CRM114-Notice: Please train this message. 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 Support for SW_INCR is unconditional, as KVM traps accesses to PMSWINC_EL0 and emulates the intended event increment. While it is expected that ~all PMUv3 implementations already advertise this event, non-PMUv3 hardware may not. Signed-off-by: Oliver Upton --- arch/arm64/kvm/pmu-emul.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 809d65b912e8..7f20da32266e 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -875,6 +875,8 @@ static u64 compute_pmceid0(struct arm_pmu *pmu) { u64 val = __compute_pmceid(pmu, 0); + /* always support SW_INCR */ + val |= BIT(ARMV8_PMUV3_PERFCTR_SW_INCR); /* always support CHAIN */ val |= BIT(ARMV8_PMUV3_PERFCTR_CHAIN); return val;