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 771BDC43458 for ; Thu, 2 Jul 2026 06:17:30 +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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From: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=1opG8KVKCkJTM4GDzfVHg07XwVYvSaDsnS3cERZdy7E=; b=vqsVpJpBIrz8imR9SdgczcUZY/ A3OkwfK8RWTUHu+pBZLtbLxdOWKU408x9e1q5iP/3/pIIDuXy5NCdVBLNkTHQ2XSvxzOjVEvejE7o ZO8V6bZJVVlxEZHPtqe/UGog6rDqWl1tj+uCSS5v0QYZzr0xVZ5X9P4Su716S1kJpkMuxjcf7PLYl MP45clcTntV8IrmNTOLDNxaHZRr+Sn5czWFR84E5i0XGPQPPtCg4RwoVhQPSWcLA8X5RsahT+sECK AYma3Ghuze31i6/64lzYntJKGk3x1Wqpcjyo1jNCg7uZ33bWab6kjBakljSwWn6DXOU9PTLRBIwYh ufJhg0YA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wfAji-00000003dVU-3Snp; Thu, 02 Jul 2026 06:17:22 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wfAji-00000003dVK-1N0M for linux-arm-kernel@lists.infradead.org; Thu, 02 Jul 2026 06:17:22 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 9EB3360172; Thu, 2 Jul 2026 06:17:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2E021F000E9; Thu, 2 Jul 2026 06:17:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1782973041; bh=1opG8KVKCkJTM4GDzfVHg07XwVYvSaDsnS3cERZdy7E=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=JGq1OIOPdp5JvKbv9Ct4JH5C2W5v3DSnOAMEt8X8r/QJlSz9G05k39jJkjDG3BiF/ llHrDHXFGXRax0Er6yiKTZWCgyI3p6KZONQHurhZ4P8urH07VCMjlueXpFsOw9oOWi hF7B2B6f+S488eyrgg0G9xd0djStAZePEGLEL8bI= Date: Thu, 2 Jul 2026 08:16:05 +0200 From: Greg KH To: Colton Lewis Cc: stable@vger.kernel.org, Catalin Marinas , Will Deacon , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Mingwei Zhang , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/5] Backport ARM64 VHE boot fixes to 6.6.y Message-ID: <2026070224-small-apprehend-b71b@gregkh> References: <20260701204342.2654385-1-coltonlewis@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260701204342.2654385-1-coltonlewis@google.com> 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, Jul 01, 2026 at 08:43:37PM +0000, Colton Lewis wrote: > This series backports VHE CPU boot fixes to the 6.6.y stable branch. > > These fixes are already present in the 6.12.y stable branch (and > newer), but are missing in 6.6.y. They are required to enable booting > L1 guests with nested virtualization enabled (kvm-arm.mode=nested). > > Without these patches, a 6.6.y guest boots with HCR_EL2.E2H > incorrectly configured (because it misses VHE-only detection or early > initialization), causing early boot hangs/trap loops. Why is this needed for 6.6.y? Why not just use 6.12.y and newer for systems that require this new feature? What is preventing that from happening? thanks, greg k-h