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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 304A3C76188 for ; Tue, 16 Jul 2019 08:47:32 +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 0C8632173B for ; Tue, 16 Jul 2019 08:47:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0C8632173B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:46486 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hnJ7S-0006a5-Fj for qemu-devel@archiver.kernel.org; Tue, 16 Jul 2019 04:47:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42933) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hnJ7G-00065W-Ov for qemu-devel@nongnu.org; Tue, 16 Jul 2019 04:47:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hnJ7F-0002SZ-FS for qemu-devel@nongnu.org; Tue, 16 Jul 2019 04:47:18 -0400 Received: from foss.arm.com ([217.140.110.172]:58290) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hnJ7A-0002Ij-Om; Tue, 16 Jul 2019 04:47:14 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 59DFA2B; Tue, 16 Jul 2019 01:46:55 -0700 (PDT) Received: from [10.1.197.61] (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 66B973F59C; Tue, 16 Jul 2019 01:46:54 -0700 (PDT) To: Dave Martin , Mark Rutland References: <1b0aa6b2-80b1-a72e-6849-7323c3b9c6bc@huawei.com> <20190715134059.GJ2790@e103592.cambridge.arm.com> <20190715134848.GI56232@lakrids.cambridge.arm.com> <20190716083050.GK2790@e103592.cambridge.arm.com> From: Marc Zyngier Openpgp: preference=signencrypt Autocrypt: addr=marc.zyngier@arm.com; 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Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190716083050.GK2790@e103592.cambridge.arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 217.140.110.172 Subject: Re: [Qemu-devel] [RFC] Add virtual SDEI support in qemu 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: Guoheyi , qemu-arm@nongnu.org, qemu-devel@nongnu.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 16/07/2019 09:30, Dave Martin wrote: > On Mon, Jul 15, 2019 at 02:48:49PM +0100, Mark Rutland wrote: >> On Mon, Jul 15, 2019 at 02:41:00PM +0100, Dave Martin wrote: > > [...] > >>> So long as KVM_EXIT_HYPERCALL reports sufficient information so that >>> userspace can identify the cause as an SMC and retrieve the SMC >>> immediate field, this seems feasible. >>> >>> For its own SMCCC APIs, KVM exclusively uses HVC, so rerouting SMC to >>> userspace shouldn't conflict. >> >> Be _very_ careful here! In systems without EL3 (and without NV), SMC >> UNDEFs rather than trapping to EL2. Given that, we shouldn't build a >> hypervisor ABI that depends on SMC. > > Good point. I was hoping that was all ancient history by now, but if > not... Unfortunately, XGene-1 is still a thing... M. -- Jazz is not dead. It just smells funny...