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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-Archived-By: 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 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-6.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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.