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 86A433A1E75 for ; Wed, 17 Dec 2025 09:18:26 +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=1765963106; cv=none; b=M9SZkL5RDqFN/BzUVfHkb7M3WYRuDvRr/MjhiyT3OR4TL0ehlYmj4WiLZsgKbvMbIKC9p4G0VkTE06y7RM9/aNN5A2BzMcPteSApe3wy2Eo2tucIzH8NGbpKNHOvxICTpIxPOJMbsnf1NeRG/C+G+buPFJxbTynOM7pmWM5xaDk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765963106; c=relaxed/simple; bh=7Y02OZvOxXnLNayVDBuC1N/CZtD5Y5yPcSygrhZZtUI=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=CDK6t2yyBSaiviryTadtn9SaCI8co//2pLhMsh1foLE1KnQAMGJWq1StCGscOw3Ws32gnv3b93tqrAUGtlxucqkP7Qx5iEC4bH3Glw9ZLH5dCXUTn+FWOmu0qalXb+P7H2ouDuN/1iVGT1Po+VVulDRwZg5QTousVkluAlZrUe4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=vFVNTP4E; 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="vFVNTP4E" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 583D5C4CEF5; Wed, 17 Dec 2025 09:18:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1765963106; bh=7Y02OZvOxXnLNayVDBuC1N/CZtD5Y5yPcSygrhZZtUI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=vFVNTP4EmLidG8cSKtBE1jZnLrlxPDNxtOgV5aSc38bboGUdCMd1zMphF0D0N0XGW zOn1LqSj3nV1pNyuTW6HhYop8NkiYg1n7H/P5mOrryJDI2ywwjVw21iA8vaxJCpkfF 2gbUYvZMs6TuA4Zhv29/qsPWi4+XTQVB68D+/jNXFIXM9RSLqrxP3dGL+Zjs78g5kw 80h52yCHpti8EKgZ8Yqa6B/RT8GrgaY1SEPtk8EjQL2kmxdIL5Zk15Iej4GMLDWNyM twNcb/k8wBk9yc1c9PRcIudU+Dlwbvnsh6k3Z+9gEa84CePiNjgjKF8Fc5xMxj0rsM GVGFXxlWjVISw== 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 1vVnfr-0000000DIRv-415h; Wed, 17 Dec 2025 09:18:24 +0000 Date: Wed, 17 Dec 2025 09:18:23 +0000 Message-ID: <867bulo49s.wl-maz@kernel.org> From: Marc Zyngier To: Alexandru Elisei Cc: oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, qperret@google.com, will@kernel.org, tabba@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev Subject: Re: [PATCH v3 0/4] KVM: arm64: pKVM fixes In-Reply-To: <20251216103053.47224-1-alexandru.elisei@arm.com> References: <20251216103053.47224-1-alexandru.elisei@arm.com> 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) Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev 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: alexandru.elisei@arm.com, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, qperret@google.com, will@kernel.org, tabba@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Tue, 16 Dec 2025 10:30:49 +0000, Alexandru Elisei wrote: > > v2 can be found at [1]. > > Similar to [2], when trying to run an unprotected VM on FVP with S1PIE enabled > and kvm-arm.mode=protected, writes to PIRE0_EL1 made by the guest in > __cpu_setup() are trapped by KVM and the BUG_ON(!r->access) is hit. That's > because HFGWTR_EL2.nPIRE0_EL1 is an inverse polarity trap and the FGT values for > the unprotected pKVM VCPU weren't being propagated from kvm_arch_vcpu_load(). > > Couldn't figure out how to run a protected pKVM VM, so that's untested. Reviewed-by: Marc Zyngier M. -- Without deviation from the norm, progress is not possible.