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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 D823BC282C0 for ; Fri, 25 Jan 2019 22:41:14 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 8AF4A218D0 for ; Fri, 25 Jan 2019 22:41:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8AF4A218D0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 43mYsN4Z2YzDqR1 for ; Sat, 26 Jan 2019 09:41:12 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=permerror (mailfrom) smtp.mailfrom=kernel.crashing.org (client-ip=63.228.1.57; helo=gate.crashing.org; envelope-from=benh@kernel.crashing.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 43mYnn3wFqzDqQ1 for ; Sat, 26 Jan 2019 09:38:05 +1100 (AEDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id x0NLZf4K021092; Wed, 23 Jan 2019 15:35:43 -0600 Message-ID: Subject: Re: [PATCH 00/19] KVM: PPC: Book3S HV: add XIVE native exploitation mode From: Benjamin Herrenschmidt To: =?ISO-8859-1?Q?C=E9dric?= Le Goater , Paul Mackerras Date: Thu, 24 Jan 2019 08:35:41 +1100 In-Reply-To: <2f9b4420-ef90-20b8-d31b-dc547a6aa6b4@kaod.org> References: <20190107184331.8429-1-clg@kaod.org> <20190122044654.GA15124@blackberry> <2f9b4420-ef90-20b8-d31b-dc547a6aa6b4@kaod.org> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.30.4 (3.30.4-1.fc29) Mime-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, David Gibson Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, 2019-01-23 at 20:07 +0100, Cédric Le Goater wrote: > Event Assignment Structure, a.k.a IVE (Interrupt Virtualization Entry) > > All the names changed somewhere between XIVE v1 and XIVE v2. OPAL and > Linux should be adjusted ... All the names changed between the HW design and the "architecture" document. The HW guys use the old names, the architecture the new names, and Linux & OPAL mostly use the old ones because frankly the new names suck big time. > It would be good to talk a little about the nested support (offline > may be) to make sure that we are not missing some major interface that > would require a lot of change. If we need to prepare ground, I think > the timing is good. > > The size of the IRQ number space might be a problem. It seems we > would need to increase it considerably to support multiple nested > guests. That said I haven't look much how nested is designed. The size of the VP space is a bigger concern. Even today. We really need qemu to tell the max #cpu to KVM so we can allocate less of them. As for nesting, I suggest for the foreseeable future we stick to XICS emulation in nested guests. Cheers, Ben.