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 93C4D3DC4A8; Mon, 6 Jul 2026 18:28:22 +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=1783362503; cv=none; b=sHOJNz1iL69KoGAqvquR6quXdtat5NxYn/Kl+8vSnAhz8jEfI96Mtae+wgXzXClxvZoeRhnUjFAqd9NSntyrcVRZAAr1q7tdbBSGinjG3NJAtTa11BZLcgtHMD7mTIbFL8Fq38hsI3c6m7gbAcepNl7z2a/w8L9S1phlB00nyLY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783362503; c=relaxed/simple; bh=p+sl2mcxLvLGIayzJN8kQT/LVY5dLfuU6k33HZgg0d4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ObUOmoGEKYGPxk45MrQzMskuzMDRrixDoGKKTb9zTvtAdJ4L04Q0BQ38Bmg7oESFHLmEOUAxp3oU76PEUykEvF2/1TRL1SeBY4mHjTze6fgkhS860j0aS/1RQN5Wax6gVk5NWlWCruRWzYa7d1wTfsUlAGcFBXiN6yxo9lJzWjQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OtEwGHPJ; 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="OtEwGHPJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE1851F000E9; Mon, 6 Jul 2026 18:28:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783362502; bh=+aIUat1jATCZ6Y0HWmZRfqf3fPfOHunP2DqpN7t2mWI=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=OtEwGHPJb9dNat2pDDCdWaRNwPuhB79FT/k4d7QeHvuOpngT7uk2YJXIpwxRU7dSg hL7ucRIloAeRfJyWtxjsIMObTY7Ur5FgnUBD0MNnBdPcrrvqwf/CuQk7iTWvgdUEkl if+rWtqzNlxH/rQ6PYRip0/b/3RlnA/B/z4ZhPV50WrvewSrTwxscvXYFeOR2orJau ssmhBD5FkRnAut7zPu6ciMjVNxD2mTeRWqXc/iuPleBVPDsuP1NjkDLSmFK+9ehpuj H3zvnlwueIcKxIbpoT0tdcA+Wu9pae7LIKouhwFaHjOuLzd9eh939HFMuTvUivL2VU jp6qcVhrimzdA== Date: Mon, 6 Jul 2026 11:28:20 -0700 From: Oliver Upton To: Akihiko Odaki Cc: Marc Zyngier , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Kees Cook , "Gustavo A. R. Silva" , Paolo Bonzini , Jonathan Corbet , Shuah Khan , Shuah Khan , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, devel@daynix.com, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v8 0/7] KVM: arm64: PMU: Use multiple host PMUs Message-ID: References: <20260706-hybrid-v8-0-de459617b59d@rsg.ci.i.u-tokyo.ac.jp> 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=us-ascii Content-Disposition: inline In-Reply-To: <20260706-hybrid-v8-0-de459617b59d@rsg.ci.i.u-tokyo.ac.jp> On Mon, Jul 06, 2026 at 07:03:23PM +0900, Akihiko Odaki wrote: > Akihiko Odaki (7): > KVM: arm64: Disallow vPMU when pPMUs do not cover all CPUs > KVM: arm64: PMU: Protect the list of PMUs with RCU > KVM: arm64: PMU: Pass the pPMU to kvm_map_pmu_event() > KVM: arm64: PMU: Pass the target CPU to kvm_pmu_probe_armpmu() > KVM: arm64: PMU: Implement fixed-counters-only emulation > KVM: arm64: PMU: Introduce FIXED_COUNTERS_ONLY > KVM: arm64: selftests: Test PMU_V3_FIXED_COUNTERS_ONLY Thanks for respinning the series, I left some comments. I'd really like to get this feature picked up, hope you have cycles to work on it soon. FWIW, we're considering adding a new vCPU feature flag to deprecate all the ugliness of the old PMUv3 UAPI. I'm tempted to say that the FIXED_COUNTERS_ONLY feature is conditioned on the new feature flag... https://lore.kernel.org/kvmarm/20260702190421.420992-1-congkai@amazon.com/ Thanks, Oliver