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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 1D104C33CB2 for ; Fri, 31 Jan 2020 07:00:11 +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 DBB4420705 for ; Fri, 31 Jan 2020 07:00:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="MHfWYHLO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DBB4420705 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:49244 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ixQHi-0008TP-1a for qemu-devel@archiver.kernel.org; Fri, 31 Jan 2020 02:00:10 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:46090) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ixQH2-0007wA-OD for qemu-devel@nongnu.org; Fri, 31 Jan 2020 01:59:29 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ixQH0-000623-J3 for qemu-devel@nongnu.org; Fri, 31 Jan 2020 01:59:28 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:52911 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ixQH0-000618-G2 for qemu-devel@nongnu.org; Fri, 31 Jan 2020 01:59:26 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1580453965; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KCttjTOypNyQ843GWrpw9fGXjQuWe6vFCW0vJ1KRroo=; b=MHfWYHLOhnAjkwiqYlrRt+uOO8En6GF0AGKVmL1ppJNlwcngK/dDY41ASm/8LewDUppqC1 fGulxPw1egGFuKaZnPdLQcBEU33dIboEhavP+NIhsWUWc+AA5qsELW3nR+YxINbfdnYEJJ gb0X0wlgWw8QJgQZ93O2plD5azgqt9I= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-126-NSxVcOdIN4y-afn7I4jV4A-1; Fri, 31 Jan 2020 01:59:20 -0500 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id ED19610054E3; Fri, 31 Jan 2020 06:59:18 +0000 (UTC) Received: from localhost.localdomain (vpn2-54-25.bne.redhat.com [10.64.54.25]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7873219C4F; Fri, 31 Jan 2020 06:59:13 +0000 (UTC) Subject: Re: [RFC PATCH] hw/arm/virt: Support NMI injection To: Marc Zyngier , Alexey Kardashevskiy References: <20191219040612.28431-1-gshan@redhat.com> <7f6e29e6-1df9-4513-79ba-b53873b0735e@ozlabs.ru> <544f261e4b9c97f1d3a5fb64cef42ba5@kernel.org> From: Gavin Shan Message-ID: Date: Fri, 31 Jan 2020 17:59:10 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.0 MIME-Version: 1.0 In-Reply-To: <544f261e4b9c97f1d3a5fb64cef42ba5@kernel.org> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: NSxVcOdIN4y-afn7I4jV4A-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=WINDOWS-1252; format=flowed Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 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: , Reply-To: Gavin Shan Cc: peter.maydell@linaro.org, drjones@redhat.com, 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 1/29/20 8:04 PM, Marc Zyngier wrote: > 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 :) >=20 > All that is completely OS specific, and has no relation to the architectu= re. > 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). >=20 > 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 massi= ve > understatement. >=20 > =A0=A0=A0=A0=A0=A0=A0 M. Marc, could you please explain a bit about "IMPDEF mechanism"? I'm not sure= if it means a non-standard SDEI event should be used, corresponding to the HMP= /QMP "nmi" command. Also, If I'm correct, you agree that a crash dump should be triggered on ar= m64 guest once HMP/QMP "nmi" command is issued? I also dig into SDEI a bit. It = seems the SDEI support in QEMU isn't upstream yet: https://patchew.org/QEMU/20191105091056.9541-1-guoheyi@huawei.com/ Thanks, Gavin