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 X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5563BC33CB2 for ; Wed, 29 Jan 2020 09:05:58 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 20F092070E for ; Wed, 29 Jan 2020 09:05:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="VhQIWJf3" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 20F092070E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:42944 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iwjIL-0000sa-9k for qemu-devel@archiver.kernel.org; Wed, 29 Jan 2020 04:05:57 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:41083) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iwjGm-0007fu-CB for qemu-devel@nongnu.org; Wed, 29 Jan 2020 04:04:21 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iwjGl-0005jt-C6 for qemu-devel@nongnu.org; Wed, 29 Jan 2020 04:04:20 -0500 Received: from mail.kernel.org ([198.145.29.99]:45378) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iwjGi-0005Qf-RH; Wed, 29 Jan 2020 04:04:16 -0500 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7B4AB2070E; Wed, 29 Jan 2020 09:04:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580288655; bh=CMVfSWl+2XIT/jE0iJpRVzU7bkl12YJtNotQ4aZTpPk=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=VhQIWJf3o8U8wrj+cAI9pZfp77ocs6I2lQhUfo/CMYa5c9lwhny94UIMs7Etis/dO T5P/mTDJmnumpwg0oTihaXiCSOMdhQ4Zfdm7d9wouhygNhQm6psj+6BYJvW6J7OHSd NvU6XJ6BF4j14a6Twa7QieQMiyM6cugRE+Avtc9s= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1iwjGf-001zDK-K4; Wed, 29 Jan 2020 09:04:13 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Wed, 29 Jan 2020 09:04:13 +0000 From: Marc Zyngier To: Alexey Kardashevskiy Subject: Re: [RFC PATCH] hw/arm/virt: Support NMI injection In-Reply-To: <7f6e29e6-1df9-4513-79ba-b53873b0735e@ozlabs.ru> References: <20191219040612.28431-1-gshan@redhat.com> <7f6e29e6-1df9-4513-79ba-b53873b0735e@ozlabs.ru> Message-ID: <544f261e4b9c97f1d3a5fb64cef42ba5@kernel.org> X-Sender: maz@kernel.org User-Agent: Roundcube Webmail/1.3.8 X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: aik@ozlabs.ru, gshan@redhat.com, qemu-arm@nongnu.org, peter.maydell@linaro.org, pbonzini@redhat.com, drjones@redhat.com, eric.auger@redhat.com, jthierry@redhat.com, shan.gavin@gmail.com, qemu-devel@nongnu.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 198.145.29.99 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, drjones@redhat.com, Gavin Shan , jthierry@redhat.com, qemu-devel@nongnu.org, eric.auger@redhat.com, qemu-arm@nongnu.org, shan.gavin@gmail.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2020-01-29 02:44, Alexey Kardashevskiy wrote: > On 28/01/2020 17:48, Gavin Shan wrote: >> but a NMI is injected >> through LAPIC on x86. So I'm not sure what architect (system reset on >> ppc or injecting NMI on x86) aarch64 should follow. > > I'd say whatever triggers in-kernel debugger or kdump but I am not > familiar with ARM at all :) All that is completely OS specific, and has no relation to the architecture. As I mentioned in another part of the thread, the closest thing to this would be to implement SDEI together with an IMPDEF mechanism to enter it (or even generate a RAS error). On the other hand, SDEI is pretty horrible, and means either KVM or QEMU acting like a firmware for the guest. To say that I'm not keen is a massive understatement. M. -- Jazz is not dead. It just smells funny...