From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 76DB3134AB; Wed, 8 Jan 2025 14:02:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736344972; cv=none; b=kBSu10+gYpU6DlxFOVqOpLYq7WkoV/7EkBXG5sny78EBFy345WiapoyLPbVI5tYOCUjF63CQkN/pjwCipH1VHdUp6pfMbky3WM/qfMrzcacrRHSwAWAVfUp8i+6L+V6Lr+rBPurTOmUYwCPqmsB30Det27UrcK8cpTpXMdwsFFk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736344972; c=relaxed/simple; bh=9dNRfXB4OfeAdPDgfa4xC8ckj17X/+Ol6//WEederRI=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=d/YuTkEvIDNGA4tQhddWFchzTK6NwiR5LQCG91Oo2p+pPlYxjy12mcq/QFRgk0+q49S/mDRLFH3DYbPIr4OdmgbP88i4hDCFVB/FQIlrKeON9Oyoagl2taxAPBzcPHzKvHSdeQ5fm1gmcJQhlLAlIeo/d1EBWLmPP6X0mHZSnok= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UQjHX4px; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UQjHX4px" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 00AAAC4CED3; Wed, 8 Jan 2025 14:02:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736344972; bh=9dNRfXB4OfeAdPDgfa4xC8ckj17X/+Ol6//WEederRI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=UQjHX4pxIrqQqJUhXqdLbhDEdSRsPT6cqEpEuVVEh+7Dn3B/Kh30OkyE/GphMleM/ O/cCoSTimnIh8HYdda4uPZR7IgSis7Odc/Rwxyu4y0bDt5sz169y0VdexCCaX57Lfi m5qvWICUYWKewnTTK7giKQ7Rv3JYD20NEzgHDdF4PZDvvxAZZkTPAKkaxF/VHzqwbU /VueXznXeyMgF5NPDgH1SPKANUuKwGWZNL6AENknE2nmn5TcwLgK2DMl+8vzNRM4pD uXj5Ph1r7YyB07Xf570EmucyfcKy9CFyus7ddmth013Y/6u+WuGZh6CFBWuIQzlKB6 ldygxAnVxUHyA== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1tVWe1-00ABHf-J8; Wed, 08 Jan 2025 14:02:49 +0000 Date: Wed, 08 Jan 2025 14:02:48 +0000 Message-ID: <86tta9wghj.wl-maz@kernel.org> From: Marc Zyngier To: Rob Herring Cc: Catalin Marinas , Anshuman Khandual , linux-arm-kernel@lists.infradead.org, Will Deacon , Ryan Roberts , Mark Rutland , Oliver Upton , Jonathan Corbet , Eric Auger , kvmarm@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/7] arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9 In-Reply-To: References: <20241220072240.1003352-1-anshuman.khandual@arm.com> <20250102160402.GB3990035-robh@kernel.org> <86wmf5wo8u.wl-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/29.4 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: robh@kernel.org, catalin.marinas@arm.com, anshuman.khandual@arm.com, linux-arm-kernel@lists.infradead.org, will@kernel.org, ryan.roberts@arm.com, mark.rutland@arm.com, oliver.upton@linux.dev, corbet@lwn.net, eric.auger@redhat.com, kvmarm@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Wed, 08 Jan 2025 13:47:16 +0000, Rob Herring wrote: > > Out of curiosity, why do we care if there's a splat or not for a not > well behaved guest? The only well behaved guest is the one that doesn't run. Getting that splat is an indication of a *KVM* bug which fails to correctly emulate the architecture (feature not advertised -> instructions must silently UNDEF). M. -- Without deviation from the norm, progress is not possible.