From nobody Thu Dec 18 09:45:22 2025 Received: from out-185.mta1.migadu.com (out-185.mta1.migadu.com [95.215.58.185]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 57B731FC7E2 for ; Tue, 17 Dec 2024 21:21:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.185 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734470501; cv=none; b=uw3pL4xTgbRhBxChrjIF/2xrYXmCCEb5Ht7o/UHS+lDVYmFqMFHDxyghMGNY4lSfPRRMXBBXbB1FMxuer+5ib0aSbaSndhpTkSHKpL3Cf5MVCcqkhIS9TmMlewYHdJbjgN7XVtLHiLiilxejhzsoiEzB6hvt+QyaE/ttPAw+0oU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734470501; c=relaxed/simple; bh=MXMO6HM+iSiZcB+0JlvSfCWzsqeO9iyIKaDuZHMuzgQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=WxvSTMpj1O9vt4PMD2OTkcqAhvj446BRDmNAUtCDuf/JS3/Kuwg0Y2lHq/h4gHlY1pBCwpJo8QZXZ2vnNEy3U1CGpEkiQkD3s1fOG5zH5dmUnGAXP0A7zPlXbAnwruT+A3xrPrOABgdT1Tf8LsJRibtfZ8c5ceHJhqAu4zrMbTA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=rZLNaTfC; arc=none smtp.client-ip=95.215.58.185 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="rZLNaTfC" 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=1734470497; 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=CJFymO38mcOTwo9Ozy+04D6XjuWZMyD8ycVX0URXSkM=; b=rZLNaTfCEsziEgMq9tNF0aLUYY9DIeVJcADzb38IxuwltCL3ddXw/uZcwoisq/I04YudCl TDdxzzPZy1KlvfB0bekieecTRrnaxG97ovgfCghK5WMTfb4zaYt9xyrnOnQJJXUMqlM/ux s9suG354SnWVyc1/NWCBR8pqThWhdQ8= 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 13/18] KVM: arm64: Advertise PMUv3 if IMPDEF traps are present Date: Tue, 17 Dec 2024 13:20:43 -0800 Message-Id: <20241217212048.3709204-14-oliver.upton@linux.dev> In-Reply-To: <20241217212048.3709204-1-oliver.upton@linux.dev> References: <20241217212048.3709204-1-oliver.upton@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" Advertise a baseline PMUv3 implementation when running on hardware with IMPDEF traps of the PMUv3 sysregs. Signed-off-by: Oliver Upton --- arch/arm64/kvm/pmu-emul.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 98690e53dc73..553d02a03877 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -1262,7 +1262,17 @@ u8 kvm_arm_pmu_get_pmuver_limit(void) pmuver =3D SYS_FIELD_GET(ID_AA64DFR0_EL1, PMUVer, read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1)); =20 - /* Treat IMPLEMENTATION DEFINED functionality as unimplemented */ + /* + * Spoof a barebones PMUv3 implementation if the system supports IMPDEF + * traps of the PMUv3 sysregs + */ + if (cpus_have_final_cap(ARM64_WORKAROUND_PMUV3_IMPDEF_TRAPS)) + return ID_AA64DFR0_EL1_PMUVer_IMP; + + /* + * Otherwise, treat IMPLEMENTATION DEFINED functionality as + * unimplemented + */ if (pmuver =3D=3D ID_AA64DFR0_EL1_PMUVer_IMP_DEF) return 0; =20 --=20 2.39.5