From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 3582347987E; Fri, 31 Jul 2026 18:51:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785523914; cv=none; b=mN2WG/QCekCGE9wlsyupGHBUVzYByes2tCeIUA1Ag3QXhc9WHgzoq5ILeXMY8XwR5Ewl1+flHxD2zzmdD9RJ0G4aab5wGibLJywCyelQSD4vPkzB7DTTuFb6r72+z80XibhovY0wUk2cr9z+UQJt3AoN49Xig8ASbwmw2nbFJhU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785523914; c=relaxed/simple; bh=Xk98sFUvrCpMxkX85+qDFdjYRwm+QTgOL6cUrk3dQgE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=HWGpidng3LEkt2+pZkejMXA3EP3Js+X5Srkay/lZXzKF0GvAyFG3CdKzyZ4zbtNfroyFU90uMdtWdt6fVnAsN2dNISlLqaxbpm0OiZIY1NWWAEnicBQYNXH+q+UntvtEw8e6lnYHErJVqlJEmgBX8IVwnJ2gFOoEkrzobklNEMw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cWj+jl6+; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cWj+jl6+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1B221F00AC4; Fri, 31 Jul 2026 18:51:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785523913; bh=WZot6GFuhy9a+s0IugMlJ70eCJTGgM/zB3nf4mCWRaw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=cWj+jl6+CIO586r12U21up84e9GPZCTcTt1faCSxLcxizMMQQYcGKJGz/RvwNUsY/ aNz08ZnrEy2GS4PI9u7HWHsjdy2cEuPiuw4/2ICAhpkLXV+jfknNspSWeB8GuyJdiZ v4l033aztqBDf7SJKezD1t/ki1Ul0fh+H749i48g6EUXUccI/Kk1nM9juxWpPQahEK hS5gBep5O6YqbxDTAEq0IbrHvL+dXmHxuPf6At3kVig8G23cbWX8/SnAMmXWMwo/vw xdCfQCzCunPoMu9xqGAK4A18oKbFIOUJQhxkIJYMXhgFS/Ms+YHadkGCkOuth+dJTa j/oVHggj+p9Hg== From: Oliver Upton To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Congkai Tan Cc: Oliver Upton , Marc Zyngier , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Paolo Bonzini , Jonathan Corbet , Shuah Khan , Haris Okanovic , Geoff Blake , Stanislav Spassov , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 0/4] KVM: arm64: Expose PMMIR_EL1.SLOTS to guests Date: Fri, 31 Jul 2026 11:51:44 -0700 Message-ID: <178552142318.30097.12495596662819704320.b4-ty@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260722202702.4165917-1-congkai@amazon.com> References: <20260722202702.4165917-1-congkai@amazon.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit On Wed, 22 Jul 2026 20:26:58 +0000, Congkai Tan wrote: > Today when the perf tool runs in a guest on cores with PMUv3p4, it fails > to parse the default metrics with "Failure to read '#slots'", since perf > can only read 0 from sysfs caps/slots, which is backed by PMMIR_EL1.SLOTS > that KVM traps as RAZ/WI. > > Taking into account backward compatibility and heterogeneous systems, the > exposure of PMMIR_EL1.SLOTS is gated behind a new vCPU feature flag: > > [...] Applied to next, thanks! [1/4] KVM: arm64: Expose PMMIR_EL1.SLOTS under strict PMUv3 UAPI https://git.kernel.org/kvmarm/kvmarm/c/453f6ff04b8d [2/4] KVM: arm64: Advertise STALL_SLOT* in PMCEID1 under strict PMUv3 UAPI https://git.kernel.org/kvmarm/kvmarm/c/203b22f76dc3 [3/4] KVM: arm64: Ignore writes to PMCR_EL0.N when using strict UAPI https://git.kernel.org/kvmarm/kvmarm/c/bbef6317f97b [4/4] KVM: arm64: Add KVM_ARM_VCPU_PMU_V3_STRICT vCPU feature https://git.kernel.org/kvmarm/kvmarm/c/ad220e275c39 -- Best, Oliver