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 64F44106FD9A for ; Fri, 13 Mar 2026 08:11:16 +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:Content-Type:MIME-Version: References:In-Reply-To:Subject:Cc:To:From:Message-ID: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=SI7kvvlORt1MLBe5EpKWqMwmUJIg7AsT1i/YgKxgMOM=; b=doODabfBmwmFQ7WeDY3iGT9f5s AuOqEihp3HLL+PlUVsC0YvUqnQONJlyIKW1v4TTkdNTnP+PmGEIW/DjsBW04gKsaDtU0uDQIx8RGL BvV9bhNZU69EktTxTVRpmATyAYrow1AcsXj13iIw+npKb/ZH3cXyFykdN1/9h++yFj13QL/HmL2iF wyCBMZ6tu4Sf8HirG6Ehr1B1JGk5V1i9MIXNZjdJxlBROiX00BRiRYGz5sR5FcUU68OYptc1M8Zvt 5Ji/5xN7akzxX5bW9/aXccDt8U1cklLXaMbnPbA3jucsj7rV42zl789ZQiwhV2Pr27sv3V6iG76TP L+TU3wxg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w0xbx-0000000HBLl-48I8; Fri, 13 Mar 2026 08:11:09 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w0xbx-0000000HBLb-1lec for linux-arm-kernel@lists.infradead.org; Fri, 13 Mar 2026 08:11:09 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id C3CED6012B; Fri, 13 Mar 2026 08:11:08 +0000 (UTC) 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) 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 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 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.