From nobody Mon Feb 9 00:03:45 2026 Received: from out-170.mta1.migadu.com (out-170.mta1.migadu.com [95.215.58.170]) (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 62FB820B217 for ; Tue, 3 Dec 2024 19:33:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733254410; cv=none; b=FwcgwLpjM3VEBnMHi4r3gxulxkiTik/DXaqC/mFAGwkkBq/TNdTJVFSHpoeog+LgPN1Pjlv6kN/tIYsTgfhUTLYbNjvusy+rQeIQLUAzhl139RUbww75jyJkdQbIcC7m1Xaxlwo6kB575bhzZVaj5C7IdCX+gfV8VVtoAy5WJGA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733254410; c=relaxed/simple; bh=zApNaI6tojKCcUw3gPguulWlel1yi3ixAh3M2UgEB0g=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ZNJHIEIoKtLyaEHBqlZozH/Az1L8hNfy5suTPbENOX2Cn5S04bKfqf+LS7pldcBwDXKyKY6vYVzi9azTh8ojS/F1+z0bKcKEbuN9Trk7Q88PH4nb5/b5k5LjGmI0uwq56NLJdx4pP9zKlW8jWNU7lJfga7/I2tspCvU48TUMlW0= 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=cJXK4INL; arc=none smtp.client-ip=95.215.58.170 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="cJXK4INL" 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=1733254406; 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=GjObVzSUPGyiRyx8ZPD/sAgeVRJoiPetpoC5aOxqHj0=; b=cJXK4INL5jtoZAsVKaT4wMa0IFT2vyHXw/V60yqBYaCbLzzagsQo2oxhgaGZBMFaxdA7xO uTM//NBSf6MXu/swHUQrOPQ3U0GI4KKCT/QYoSi7B97s9ihPnJVkaXM8HKQgP0edrmEz9a 6fyyV66ig91+6AszbHOSrlwLio0eemo= 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: [RFC PATCH 12/14] KVM: arm64: Advertise PMUv3 if IMPDEF traps are present Date: Tue, 3 Dec 2024 11:32:18 -0800 Message-Id: <20241203193220.1070811-13-oliver.upton@linux.dev> In-Reply-To: <20241203193220.1070811-1-oliver.upton@linux.dev> References: <20241203193220.1070811-1-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 8a565817a814..34d9c08af209 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -1260,7 +1260,17 @@ 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