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 2A889C77B60 for ; Wed, 26 Apr 2023 08:16:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:References :In-Reply-To:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=LV1SVH9EVJjklimOCqD8QpO6nm/XvLeNRNmE6NNyHr0=; b=TnJQ6Kj4SLu+Vd MTLYTj1PlZ7Jyv0yj+7htWIpH6Acn9oXh22fR3GKu669lMQyp68IDbZ3wTrAkLVeXQcHOSGvBzzQt 0GDM9INrHpoiqz0YlE+iMp0D5o6992QyQpOwEiXJHyqGfdr4KrY1k5ks9GIazCsq4gBFt3QCV1rHo JZUFohX5n1BBrOBzOR7lmacs7H3dWSl91zbac4Om4GFr8CDGUpJMaTVxG4ycn0Dps9OU2qoDtU3Qc c33cFaG+lFRDaZK9lTFEe1wO3uAdQPe3+AnzjRfLx4rz8qRdT01/7dMp15xSPW4ACj5n/24UyVJfg v7UTe4O6x1uUK9n5EB2w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1praJg-0038tC-25; Wed, 26 Apr 2023 08:15:56 +0000 Received: from galois.linutronix.de ([193.142.43.55]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1praJe-0038sB-0u; Wed, 26 Apr 2023 08:15:55 +0000 From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1682496949; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=y7cSCpTFBU6gtNFDDvX9BBXJHGwRYvRyuVYMZSUvskg=; b=puMJndFvZk2DjG2oGhTaaANtFluqIT71fJ8veXKWgaKYEc7ZaIibudafgbLM64wYizw2Y+ OXOoExk0mzZdwI+qZRCbqqN29gJr4bx9hGMM4FqEkCO4H6WN381K3f/yJnQUdMhiDoudkE v7q+YkKqQYiLDFXvBw9Q1TAKdQtU3EOXylf0wOjoPixyD8dhvyM5BYTWe0qo092Dn58dWD wK5mQfTO6pClT3oj6wx4w2PqZTUsjxsf5TLo5xJWNv/gc/U3RQVFJKGrWcJS7Q1p/NUtUU aUWCZ+sybUxpx87tAuGvu76aAkAfxwkf6VweEiexDbnjkrDzfgfAwBP2nQkz6w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1682496949; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=y7cSCpTFBU6gtNFDDvX9BBXJHGwRYvRyuVYMZSUvskg=; b=4JTA5ZSC1xgsH2IPcOsiykb/g/HrD1bcjGUJcIN8iOa9ku/bVlaHwu78ldM0LGCo2BtXJa 9xfjqD5Ed8VSHzCw== To: Mark Rutland Cc: LKML , x86@kernel.org, David Woodhouse , Andrew Cooper , Brian Gerst , Arjan van de Veen , Paolo Bonzini , Paul McKenney , Tom Lendacky , Sean Christopherson , Oleksandr Natalenko , Paul Menzel , "Guilherme G. Piccoli" , Piotr Gorski , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, David Woodhouse , Usama Arif , Juergen Gross , Boris Ostrovsky , xen-devel@lists.xenproject.org, Russell King , Arnd Bergmann , Guo Ren , linux-csky@vger.kernel.org, Thomas Bogendoerfer , linux-mips@vger.kernel.org, "James E.J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Sabin Rapan Subject: Re: [patch 22/37] arm64: smp: Switch to hotplug core state synchronization In-Reply-To: References: <20230414225551.858160935@linutronix.de> <20230414232310.569498144@linutronix.de> <87ttx3zqof.ffs@tglx> Date: Wed, 26 Apr 2023 10:15:48 +0200 Message-ID: <87ildjys7f.ffs@tglx> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230426_011554_468218_D4E64F5E X-CRM114-Status: GOOD ( 14.36 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Apr 26 2023 at 08:59, Mark Rutland wrote: > On Tue, Apr 25, 2023 at 09:51:12PM +0200, Thomas Gleixner wrote: >> If not then it's just yet another way of DoS which is an "acceptable" >> attack as it only affects availability but not confidentiality. > > Sure. > > My thinking is that this is an attack against the *integrity* of the guest > (since the vCPU that gets unpasued may write to memory), and so it's > potentially more than just a DoS. > > I only mention this because I'd like to account for that on arm64, and if other > architectures also wanted to handle that it might make sense to have some > common infrastructure to track whether CPUs are potentially still within the > kernel. Fair enough. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel