From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792591494; b=NXNJwlwyUdVTymemT5RTCdhEIqOBZhkM+ZQDPy2ZPr5Hhmc/PctIvBG5VCU/dJN8Ll0W kLlw1FSc5PmyVLl3G9ikvjnkVjlDyCBtaH030w0t8YLGYiFTo1ZsBJsWWreEZJ8F/oq73 WxG5yTEn1JV1IBlEp8JIS216zCzur7tCwG4BUUaiWE0slRTufRAfAi3Z9eOkpyScSQRWa 7mZpBdyGojwIlgOyMI4WYFCXDY0eJAiEXFpvZpCx8glqyBHAka24vuOkhhyXjzv0TCsOz IPUSNEhEAYth3jPCJFkG+kjpD3KSNHFg+iWBoQWr7yNLTVrJQhX/tDKuYQHz/nz1WJw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792591494; h=Received:DKIM-Signature:Received:Date:Message-ID:From:To:Cc:Subject: In-Reply-To:References:User-Agent:MIME-Version:Content-Type: X-SA-Exim-Connect-IP:X-SA-Exim-Rcpt-To:X-SA-Exim-Mail-From: X-SA-Exim-Scanned; bh=yA/d7xHCvimeiSgT5X9qinEfD4f+i9hf+y7HDZY8TE0=; b=4srHYibEpUGb37QoOiHF3T2nAXrwr/PLQzj7yAroGvZXv5B2wyvyfgZ1cywwhuw5rfOy RUqudQIzRNvdl7rNbZu7OY5S0eYuGa6J9J9he80LNLTLIfrTGjHHxt85wC188Z9WaYhFW Em9Z0K1d5hx91nrp/DttatE2ospgz5J6m8BaZm17QhRtVJvt+wtbu01MRJzKaSLiuBGiB SC489Z0AiH1yFNqhUPUqh9j8DKL0GVmnQgoAquHEuXOWqKKKuBq9x/8G9I3Q6nP5mGVnX QCRHmpYMps3lrIg1VaWleA3PFvyooIuJe1C4SLF9u1EigAD4givsA2E/0NVX3m9dGyQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=UZT563FZ; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 841E9606A31D; Wed, 21 Oct 2026 14:04:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=UZT563FZ Received: by smtp.kernel.org (Postfix) with ESMTPSA id 585A91F000C4; Wed, 21 Oct 2026 14:04:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792591494; bh=yA/d7xHCvimeiSgT5X9qinEfD4f+i9hf+y7HDZY8TE0=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=UZT563FZdUGP4XEOxzleadiPXVItt+IukRA8Q0pvDTxGiRM352eYfiFV3ZpR+mAVS TOQjs7SZu0k5T4qA1b3jK/KenlsAX5Z/ktvQeei+NBo+GiJYMU1Zjl7ApteFHRINEI hSq9E9Ev9QMZzgUGPeHOlyrcDVwA8fX+4LWiRb554HkCtBIupo0D0UlBbWpJXsszA8 fqCSms+YgllcSe8692GwRRjbTBNRea9tv5t7GhH9rz0zx+k55jhqDusib5AfuhpXlz uJSq+QtrtEsYVgA4KaAFAP6JAc1qfAqd9zwfAXk21T1y+5S8qY4UOCdilEeKp0VqcD I1xsQEQ7V0lVQ== 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 4.98.2) (envelope-from ) id 1xJWw0-00000005dRI-1xo7; Wed, 21 Oct 2026 14:04:52 +0000 Date: Wed, 21 Oct 2026 15:04:51 +0100 Message-ID: <86mrs7ywsc.wl-maz@kernel.org> From: Marc Zyngier To: Mark Brown Cc: Fuad Tabba , Oliver Upton , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Stoakes , Fuad Tabba , linux-kernel@vger.kernel.org Subject: Re: [PATCH v3] KVM: arm64: Sanitise ID_AA64MMFR3_EL1.S1P[IO]E In-Reply-To: References: <20261020064306.1542865-1-fuad.tabba@linux.dev> 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/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list 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: broonie@kernel.org, fuad.tabba@linux.dev, oupton@kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, joey.gouly@arm.com, seiden@linux.ibm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, ljs@kernel.org, tabba@google.com, 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, 21 Oct 2026 14:02:54 +0100, Mark Brown wrote: > > It would be nice to have it be more obvious to the VMM and/or it's users > that it messed up, as things stand features it thought it had set will > just silently vanish from the guest - they'd need to know that this is > something that might happen and check after finalization or similar. > That's probably more a documentation/education thing than anything for > the patch. The VMM is an integral part of implementing the architecture. If the VMM doesn't cooperate, that's its problem. M. -- Without deviation from the norm, progress is not possible.