From nobody Thu Dec 18 18:47:15 2025 Received: from out-179.mta0.migadu.com (out-179.mta0.migadu.com [91.218.175.179]) (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 7950620E022 for ; Mon, 3 Feb 2025 18:32:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.179 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738607571; cv=none; b=dMmjmdRDR64RCPZS2m0glEv8b3rJC9YfnU7uXO0jOpkd8Ikbg84QL7tH/gAcOt67oE6Tp6qsrKpVVHP3poSButu+4vazlgJ9a9SPPI5E2cpbwlK/E/7ge4Fb5M46Z7igNY+N4bCwocXkOaVonhkaWIfMcgT6geilxH57muqmhC4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738607571; c=relaxed/simple; bh=AH+nkSEjSOmGlcRzTX6OKf73NS+zmT79gH8M3qzluS4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=j9mW+KxtU1s5j4yqLzVbUdmEW5jDZsFzwK3abbcdGhwYdPzlI+DCYzPaC2be8+gotjKHeoW5D4dXOKBcqm334kCs/q1XsgLRXieoI6Kteqejq/g8BMfpgKdzckBrzxTTuOkQOsE7+djBFqmnCcaMsBtuhMCj6eY+kKefuNCgOAc= 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=ASPv2DWs; arc=none smtp.client-ip=91.218.175.179 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="ASPv2DWs" 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=1738607562; 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=tsB8DsHJdiQoqXPS3Rw6NkqRDeCazk+YgKLVcGUuCus=; b=ASPv2DWsSwlCcEkU96RkM6PGoyvIht2TDFL/inVk8yPyCKy2mLCUUN222fgZQee9DgABM2 4QZAfFnvlRePJ5Drk4uDoCt+AFlkWHkGVuKJpVqEPGF0SvTddMP6bWlIuh3EQGfGLDzwmy vay3ZczDkikQOVpNJAZqwnJH5KOIH44= 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 , Janne Grunau Subject: [PATCH v2 12/14] KVM: arm64: Advertise PMUv3 if IMPDEF traps are present Date: Mon, 3 Feb 2025 10:31:09 -0800 Message-Id: <20250203183111.191519-13-oliver.upton@linux.dev> In-Reply-To: <20250203183111.191519-1-oliver.upton@linux.dev> References: <20250203183111.191519-1-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 57ef4f2814fc..97f29153193f 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -1243,7 +1243,17 @@ 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