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 E4C6020B80B for ; Fri, 13 Mar 2026 08:11:08 +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=1773389469; cv=none; b=Go0UV96biaIVbnnIDNJzGS5/LTDn57yX0f75pS4iimpHRmXD40k57TWldz5GnqZsNl+T2k11Ts1WFOS4j4BrQlKOKqR/eGYUGREHwmW2JOtjw+YflE/9nb6H7a28iBLywqi8wtBy3dvEbzIFdZ1hrxxcK9dCoSu2hFkzbYODVZE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773389469; c=relaxed/simple; bh=I7egZhyYPxSTdGmXKgwu/pmNuCffmoqA8UbmTE7IuLI=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=somDqobtXVK1PWg3mcr4FaxK3fUBau5rMY4YlQQyNWe6tmc6/1wNqI8Ly8/LCSwSlXtChjvifYsKWDabCjMos/zUbqZ5fCnnD6V2NiyiPaA3nOle7ywLMVh/2aeFU0jLowxzfObV9Ejs9Mte990nd47GUPRRcG5T3kzgylrqMFk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eRzRKtYH; 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="eRzRKtYH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7144EC19421; Fri, 13 Mar 2026 08:11:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773389468; bh=I7egZhyYPxSTdGmXKgwu/pmNuCffmoqA8UbmTE7IuLI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=eRzRKtYHJugy3r3yTn66FEMvREUPdydoCnE/gAyGxrgj/QK2VjT1/WhxaG+3T9v4p 3yUCXLTt62f7w6v2m9r0WqKosEl4xzV1njAzvraSIJ2OPwii/qTKnOzGTuFgqHn3pl E0EdND0rKy5CPsWTHc+srPd5kT7zOgLMHtqbtXP5xf8xD+uZyZ0rX/q3U/myQR2gpI lLgqftl1kzqKsoGyOWiHIKNJUKP+D+kKDb987hFrdNgfpdqglJ2hi3HI3FNfCZ8tmE aOdyJ3+85Nzbq2r6iV1q8z7WcEAfC3OQxncRFptR8UEWlvFMShP2d9lcRb2CbgUHDo KfRWJUS00UMkg== Received: from 82-132-235-41.dab.02.net ([82.132.235.41] helo=lobster-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 1w0xbu-00000001Zn1-0t0G; Fri, 13 Mar 2026 08:11:06 +0000 Date: Fri, 13 Mar 2026 08:11:04 +0000 Message-ID: <87o6kscfon.wl-maz@kernel.org> From: Marc Zyngier To: Anshuman Khandual Cc: linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon , Oliver Upton , Mark Rutland , linux-kernel@vger.kernel.org Subject: Re: [PATCH] arm64: Clear VTCR_EL2 in __init_el2_stage2() In-Reply-To: References: <20260313053857.1277828-1-anshuman.khandual@arm.com> <87sea4chrw.wl-maz@kernel.org> 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: linux-kernel@vger.kernel.org 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: 82.132.235.41 X-SA-Exim-Rcpt-To: anshuman.khandual@arm.com, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, will@kernel.org, oupton@kernel.org, mark.rutland@arm.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 Fri, 13 Mar 2026 07:54:04 +0000, Anshuman Khandual wrote: > > But it can be argued that these registers > need not have to be cleared now and can just be initialised before > setting up HCR_EL2_VM itself. In which case should we drop > __init_el2_stage2() entirely ? And something worth thinking of: the role of VTTBR_EL2.VMID when HCR_EL2.VM is 0. M. -- Jazz isn't dead. It just smells funny.