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=-11.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 7A990C43465 for ; Fri, 18 Sep 2020 09:33:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 33B2E21582 for ; Fri, 18 Sep 2020 09:33:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ahAFF1i7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726589AbgIRJdb (ORCPT ); Fri, 18 Sep 2020 05:33:31 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:50439 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726159AbgIRJd3 (ORCPT ); Fri, 18 Sep 2020 05:33:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600421608; 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=YyxvQapKO8cJ+h1msTh4Bn1k/c9vh0JXpNMN+TtY/Sw=; b=ahAFF1i7fMzT8xjFRQLAOL+w1Mvw5o0mCjlI2GNpje+SkkEcMcAar7PTgchXmrBMULCwlx +yi55h+ULht+PyR0Qgi6LtUchbOSVYhGysGB0hk9+cb+4qC/md+ab+4nPSEeienloDhiP7 Dp8r/gDS1gxfQTDK6Y4xvU4mw3zK8Bg= 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-585-DO35AFk4Nsq_aFG1fRQDGA-1; Fri, 18 Sep 2020 05:33:22 -0400 X-MC-Unique: DO35AFk4Nsq_aFG1fRQDGA-1 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 4AB5F1091066; Fri, 18 Sep 2020 09:33:21 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-112-85.ams2.redhat.com [10.36.112.85]) by smtp.corp.redhat.com (Postfix) with ESMTP id 672E519D6C; Fri, 18 Sep 2020 09:33:14 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 943F516E0A; Fri, 18 Sep 2020 11:33:13 +0200 (CEST) Date: Fri, 18 Sep 2020 11:33:13 +0200 From: Gerd Hoffmann To: "Michael S. Tsirkin" Cc: Sean Christopherson , Vitaly Kuznetsov , Peter Xu , kvm@vger.kernel.org, Paolo Bonzini , Wanpeng Li , Jim Mattson , Julia Suvorova , Andy Lutomirski , Andrew Jones , linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 0/3] KVM: x86: KVM_MEM_PCI_HOLE memory Message-ID: <20200918093313.7qfsgi7o46imqunc@sirius.home.kraxel.org> References: <20200807141232.402895-1-vkuznets@redhat.com> <20200825212526.GC8235@xz-x1> <87eenlwoaa.fsf@vitty.brq.redhat.com> <20200901200021.GB3053@xz-x1> <877dtcpn9z.fsf@vitty.brq.redhat.com> <20200904061210.GA22435@sjchrist-ice> <20200904072905.vbkiq3h762fyzds6@sirius.home.kraxel.org> <20200907065054-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200907065054-mutt-send-email-mst@kernel.org> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, > > We could probably wire up ecam (arm/virt style) for pcie support, once > > the acpi support for mictovm finally landed (we need acpi for that > > because otherwise the kernel wouldn't find the pcie bus). > > > > Question is whenever there is a good reason to do so. Why would someone > > prefer microvm with pcie support over q35? > > The usual reasons to use pcie apply to microvm just the same. > E.g.: pass through of pcie devices? Playground: https://git.kraxel.org/cgit/qemu/log/?h=sirius/microvm-usb Adds support for usb and pcie (use -machine microvm,usb=on,pcie=on to enable). Reuses the gpex used on arm/aarch64. Seems to work ok on a quick test. Not fully sure how to deal correctly with ioports. The gpex device has a mmio window for the io address space. Will that approach work on x86 too? Anyway, just not having a ioport range seems to be a valid configuation, so I've just disabled them for now ... take care, Gerd