From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 74991E77188 for ; Wed, 8 Jan 2025 14:04:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: References:In-Reply-To:Subject:Cc:To:From:Message-ID:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=c8IgbRvapdQ1nro0kgRt5ie7NEaVTpaPkDdCly2nF5o=; b=peVlKllijXTEjpp4K7OpJmJeYz UPFC/BE01iHbwuTdpkbx+gI3vGtI7ZsSTJFThHAW+a5+sG9ya57SCcAH6u7tYBx9tWAX6QM+x7SAX 14QDpvzzt4APJrvkSVydGhwhJCgNDEqDrjsqup4mUCUPIW4aXmCUZvo61NhILS6knCuUfktlTJzww AAxRGEYBtAVVHGWwX2Vp6xJa28YSWJAbXptkmp+I3RxzSU9jJbMjb41GMOvZT1+e3JEtp1WQUH3v0 yj28KbwjIxWRSS+Rf20sxERHyr6WWyR1tG5fFMBIIIVEfefJsYulrDfh7QqlGQsu0vgR6W/8Zckja e3G89wIA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tVWfJ-00000008jQg-3bE1; Wed, 08 Jan 2025 14:04:09 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tVWe5-00000008jAz-29Wd for linux-arm-kernel@lists.infradead.org; Wed, 08 Jan 2025 14:02:54 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 44B9B5C495D; Wed, 8 Jan 2025 14:02:11 +0000 (UTC) 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) 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250108_060253_593315_14A91B78 X-CRM114-Status: GOOD ( 13.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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.