From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) (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 33DAC19F40B for ; Thu, 24 Apr 2025 10:22:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=78.32.30.218 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745490129; cv=none; b=W86ckDDyAhPblFr18sTEEukcXKVfsB344vmzyetvFya6wbUopbOhXBx28LLhoGkVW07Vu99cAb3SpY/z3EuyRQd8cQjQEAgo4dUZErFmBwIyWpxqKg/PDmU525yfQqFx7ofisg35NdbnNF+X5bWEV6GJzkqKGba1zd3NiUsuGNA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745490129; c=relaxed/simple; bh=DjWV+iyUfNjwjx7gVg2kl3E5NyWIUSHxz7PKe9j1ogA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=onXVshB/Mvd2P2SKP1rq880g0px3HcM06jw4Tetb0x6L1pO9g742L7J3l5rKeDymtHx3ODHUjX17eMh+L77VXeaHAo1s7yOYXhpGuaf0olItuEGlvGyQTtFwPofXOEVgN/y+KLWbrHYbwlXvquoxmCi6j5x3Ytpm02p1ng2wyFQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk; spf=none smtp.mailfrom=armlinux.org.uk; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b=WSWeZy8t; arc=none smtp.client-ip=78.32.30.218 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b="WSWeZy8t" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender: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-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=G/Gm0iaohoSUpFALDcDYkX48JKnw9ZtngTxphpD+oZ4=; b=WSWeZy8tdQ5+hNrDfHXaJP/mBc MMNrqvUk7fzxVuQtqKUWvqHicHn9KQ4vbgZS3df6ZfBVfzzm5XVJibPsvsiXLlDcB68ctT4ylEzY5 FsUYrZOiXKTb0KnKWFySK7uw52huudu6QuNaWdV/VX2cIZQaLuI3wPuJWwq3j+XqFuAc1qfoMycmf YCJE3ZXIV6dZGga8UZJVCWgTQ8nsUFOO+bbW5B2EA3IBvwXhCrcWi/dtASngsFAe1Q5jG51+K55L8 YdKbpkOc5EKVVafkUewbejioRaB+S4lmZ2vEkBYzzsZH8KDM3OVujyjlPH6l/kIVexAS/wzyYi7sM +092G0Wg==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:42566) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1u7tiP-0007Bh-0p; Thu, 24 Apr 2025 11:21:57 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.96) (envelope-from ) id 1u7tiM-0000zm-2N; Thu, 24 Apr 2025 11:21:54 +0100 Date: Thu, 24 Apr 2025 11:21:54 +0100 From: "Russell King (Oracle)" To: xieyuanbin1 Cc: sfr@canb.auug.org.au, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, will@kernel.org, nixiaoming@huawei.com, liaohua4@huawei.com, wangbing6@huawei.com, lincheng8@huawei.com, wangfangpeng1@huawei.com Subject: Re: [PATCH] ARM: spectre-v2: fix unstable cpu get Message-ID: References: <20250424100437.27477-1-xieyuanbin1@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250424100437.27477-1-xieyuanbin1@huawei.com> Sender: Russell King (Oracle) On Thu, Apr 24, 2025 at 06:04:37PM +0800, xieyuanbin1 wrote: > From: Xie Yuanbin > > When a user program accesses the kernel address, Please see https://lore.kernel.org/all/795c9463-452e-bf64-1cc0-c318ccecb1da@I-love.SAKURA.ne.jp/T/ As I see it, this can't be fixed - certainly not in this way due to the reasons I set out in the above thread. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!