From nobody Sun Feb 8 05:07:32 2026 Received: from out-177.mta1.migadu.com (out-177.mta1.migadu.com [95.215.58.177]) (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 C868025BAD0 for ; Wed, 5 Mar 2025 20:27:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741206448; cv=none; b=Yeaak0sCzCuw8jlcuLOjiu9L760pamqWAAtgPcNH4eTkv/5z1jyOREKocN25KVD97gGqXaO8UNPE8wRXb/IjnHGU+i1lUAnNgZvYF4RojY8CS4KsEjNsK6Mw61h6HOs6yxPGxPn4nvD0mEjMYdTP28HaqwA/fzLRkbZhBVGv+hU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741206448; c=relaxed/simple; bh=2Zvff9DSxDiWX36E1VtM6LDxSAojrVJGu+d6/O1PddI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=JdQQm1oR8JH07eNOu3BBGhLu8IA8b275D0E3k/C5uJUSsOElW58sTI50sdpk2U9XIoYsLCE+cySb3bPl1obfxrQO5rrhRdOpHqst0khb3MbEScwk8Bf/ZCd739eBDx6qDoyc7+ipFkppKElya3es5knEg3UrbyNYvKV1MOpKRng= 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=CvRjYyN5; arc=none smtp.client-ip=95.215.58.177 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="CvRjYyN5" 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=1741206445; 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=2bDDTqqIerMygPlFTbXBzR4bAQlHdxowEVy28NROPr0=; b=CvRjYyN52Un6ydpsuq1SFFaX1v1zahr9DggPQ2o4kQKHj7xsiRct/cl1sDD4Js7F6m51gC 6HmY7UHb8yHaH5vQm5rJdloqsTjnh5LgD5Y+wszGXySE+fNvqfwlUFIQL9Lw3JyJdpEep/ lBy3A9y3J8Mm6t/qt9Ye0ux8/lDZG1o= 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, Janne Grunau , Oliver Upton Subject: [PATCH v3 10/14] KVM: arm64: Advertise PMUv3 if IMPDEF traps are present Date: Wed, 5 Mar 2025 12:26:37 -0800 Message-Id: <20250305202641.428114-11-oliver.upton@linux.dev> In-Reply-To: <20250305202641.428114-1-oliver.upton@linux.dev> References: <20250305202641.428114-1-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. Tested-by: Janne Grunau 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 0a2023aabe18..38d9490c17fd 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -1231,7 +1231,17 @@ 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