From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 B09F613DDAE; Fri, 10 Jul 2026 21:03:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783717408; cv=none; b=PCWz6p3tQ01pzgHN864sooVBQPHdD9OykI5BOHa4KqabTKSjadA1bBWtd1a2qLIIrQdLFFKwIpjGi/hKd3s+hScQb0mlSYbvzzWlgvYFhkr2PR7NbZ0DgjJQdeZ4twob0KxsFpjSTwEh0dgw2/4nA4OfPvwIrd8CNVALUa/dv3I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783717408; c=relaxed/simple; bh=gUFh2jEwowyf3tBPGLOuRxUu0ZrIQ6KUHu9kkmR9BTU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aePTFKxhWb1f2W9gniltde32q4zyLP80WKS4ZTUhyvh/s/wgXKlbK81FhhzO0nHBkc0hsub8ysva8ooU82tNRhaj0jDXtjYFYPaw49ldfjIVwFda8YopxqpsgDEoDEhBhztGBo9Re34dzu4pxOfIM2gNbfDU57Vj7VPhwoBogWc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PJIxyA9T; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PJIxyA9T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 863E11F00A3D; Fri, 10 Jul 2026 21:03:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783717407; bh=IxDQXUffjDPiX8s75V9lUlztwYc8UXv2+mVoAik2+IY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=PJIxyA9T9LcedZvZtKzFpv4Nv71M/63UFU1MMhcIJ/witPYFfZxgHfa0l5l3+46kt S8jHOqiu9gYMsbCrNw8vyi2rh+mFTGaA5y/q1GxqAMAnyAY2FjVXpfiNIP5qD+lnOd x+gHiqPkYwzJehN+CZ4ENbbhyy4g1NbaMx1nbQ6/l3nfpJC5uiIDnEmI/fdpb7/bxC GS5jVf3EzR2VfcWfBU4XHLnmu429oiVjVzhjB6HOviZFMLcFnUW8YOTwmIaggNUGcB /s/3BXiB253AW0lhVTgW8GBFyc8MrHQQ8oBNocaMftBoE9IqqOuX743M8LC6js1hC9 WpYSuyKI5vHig== From: Sasha Levin To: stable@vger.kernel.org Cc: Sasha Levin , oliver.upton@linux.dev, gregkh@linuxfoundation.org, mizhang@google.com, catalin.marinas@arm.com, will@kernel.org, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, mark.rutland@arm.com, ahmed.genidi@arm.com, leo.yan@arm.com, miguel.luis@oracle.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Colton Lewis Subject: Re: [PATCH 6.6 v3 0/6] arm64: KVM: Backport VHE-only boot fixes Date: Fri, 10 Jul 2026 17:03:00 -0400 Message-ID: <20260710163023.agent5-0004@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260709223604.12934-1-coltonlewis@google.com> References: <20260709223604.12934-1-coltonlewis@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Thu, Jul 09, 2026 at 10:35:57PM +0000, Colton Lewis wrote: > Architectural updates retroactively made FEAT_E2H0 optional, meaning > hardware can implement FEAT_VHE without FEAT_E2H0. On such CPUs, > HCR_EL2.E2H can reset to an unknown state and must be initialized early > so later code can reliably detect whether E2H mode is active. > > Without these fixes, booting 6.6.y as a guest under KVM nested > virtualization will hang at boot. Queued the series for 6.6, thanks. I also picked up the follow-up "arm64: sysreg: Correct sign definitions for EIESB and DoubleLock" on top. -- Thanks, Sasha