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 DBD1719539F; Thu, 16 Jan 2025 10:55:37 +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=1737024938; cv=none; b=W1M9Z0SPJqIbyibZg5tY5qdUZaw8+tDzindvVUj5qNO7ZiFwnXIOtgE5Qe18h8ARtkzLIU+alz51E44F5wy2m+hmFNKbMqPRW1Y38htTj7BDg29nlNMOkg6Y4pLIc4ELCLuNChgRKhuogU8mACEspYFGMhlzf/gUilBRuNzthS0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737024938; c=relaxed/simple; bh=7t9yVD5T2eBuQqjdqyQ+IxjsRIWm6Eu4aTVUaQ3Sq0A=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=uJd/hBfDNqCNUju0wy7/f+3i81FlkTyOSL7C+9xBUS5lcIYaFEQaA9S7rrClVQUDvoFyboy4st7d7noAcnkYGU/qs4RizyhfrIJWTgkhyQ7s7EE7/679WSiMAefOhRwi2oLZZXXOZJh9NRmrAFxmJonIRp+3SMt9bT7pEfnSv5I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=R+3T2+oL; 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="R+3T2+oL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 60DDBC4CED6; Thu, 16 Jan 2025 10:55:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737024937; bh=7t9yVD5T2eBuQqjdqyQ+IxjsRIWm6Eu4aTVUaQ3Sq0A=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=R+3T2+oLp4Ylup6p3DZ+31EvipsIHmwzxrhqleYNBBotRTKFwtwogPRe77szwdZMp rQYL9Z4WtETYXyADR7m0B9KaFBH+FT1+0yzXYJJMVXxwLnGj4bEkHOk5nnXQa6n2yx S1ZVRDW3QL569sQ61dpOytHXbZa12mTA9ExWBIMP40qq1sbWwYnjTMc+TaGGst9nbn w7JwyoNa11GDsI5m9ljMH5vOtGLDYVAC3iNDsofF3Msff2gXTNIQ156ijpcqm1xisA jJoJq1tpYtokYKLhQPqXCHUojs0eSJWV5piS4eX5ArxVD6JjAkxae816u/F/j+kqIE qgfQJLm8pZgIw== 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 4.95) (envelope-from ) id 1tYNXD-00Cm4I-8E; Thu, 16 Jan 2025 10:55:35 +0000 Date: Thu, 16 Jan 2025 10:55:33 +0000 Message-ID: <8634hjvxi2.wl-maz@kernel.org> From: Marc Zyngier To: Sebastian Ene , Mark Brown Cc: catalin.marinas@arm.com, joey.gouly@arm.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, oliver.upton@linux.dev, suzuki.poulose@arm.com, will@kernel.org, Aishwarya.TCV@arm.com Subject: Re: [PATCH] KVM: arm64: Fix the upper limit of the walker range In-Reply-To: <14cce00c-29bd-4feb-b7d0-7aae6e948d1e@sirena.org.uk> References: <20250114145050.563658-2-sebastianene@google.com> <14cce00c-29bd-4feb-b7d0-7aae6e948d1e@sirena.org.uk> 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/29.4 (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: 185.219.108.64 X-SA-Exim-Rcpt-To: sebastianene@google.com, broonie@kernel.org, catalin.marinas@arm.com, joey.gouly@arm.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, oliver.upton@linux.dev, suzuki.poulose@arm.com, will@kernel.org, Aishwarya.TCV@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Thu, 16 Jan 2025 01:16:40 +0000, Mark Brown wrote: > > On Tue, Jan 14, 2025 at 02:50:51PM +0000, Sebastian Ene wrote: > > > Prevent the walker from running into weeds when walking an > > entire address range. > > The KVM page_fault_test selftest started failing in next-20250115 on > at least n1sdp and TX2 in VHE mode and a bisect seems to point to this > change. The bisect only just finished, I've done no further > investigation. > > When the test fails it generates backtraces like that below: [...] Thanks for the heads up. Given how close we are to the merge window opening, I've dropped this patch from -next. Seb: it looks this breaks a bunch of existing assumptions. Let's revisit this before -rc1, if possible. Thanks, M. -- Without deviation from the norm, progress is not possible.