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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 775A7C433F5 for ; Mon, 4 Oct 2021 09:51:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 50E09610A2 for ; Mon, 4 Oct 2021 09:51:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232470AbhJDJx1 (ORCPT ); Mon, 4 Oct 2021 05:53:27 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:53789 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231932AbhJDJx0 (ORCPT ); Mon, 4 Oct 2021 05:53:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1633341097; 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=11lDRR5Yz28JFxRtHvrquBSIh5tMxQHAlBJP5+qYWSo=; b=DHWBpIMySfcR2f34HYwHLXAqDbZ7a++6s9liwrPFBsGZ0LsMLTV/6c0ShUgiPCjxdAWE0k mxIAbSLizVyzKCIUX1+PCsCok6iL1egx4qfVoRgsOp3g2HEXjDLeV7R/74VrjrAl+h+Olp tRCjKztEA3Eu76TzajUFMSvA0xb3d9Y= 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-343-TsrUeYovNKGhF15TjTdcUg-1; Mon, 04 Oct 2021 05:51:35 -0400 X-MC-Unique: TsrUeYovNKGhF15TjTdcUg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3B63E8015C7; Mon, 4 Oct 2021 09:51:34 +0000 (UTC) Received: from localhost (unknown [10.39.193.66]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 154DC60657; Mon, 4 Oct 2021 09:51:29 +0000 (UTC) From: Cornelia Huck To: Halil Pasic Cc: "Michael S. Tsirkin" , Jason Wang , Xie Yongji , virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, markver@us.ibm.com, Christian Borntraeger , linux-s390@vger.kernel.org, Halil Pasic Subject: Re: [RFC PATCH 1/1] virtio: write back features before verify In-Reply-To: <20211004112528.74442e52.pasic@linux.ibm.com> Organization: Red Hat GmbH References: <20210930012049.3780865-1-pasic@linux.ibm.com> <87r1d64dl4.fsf@redhat.com> <20210930130350.0cdc7c65.pasic@linux.ibm.com> <87ilyi47wn.fsf@redhat.com> <20211001162213.18d7375e.pasic@linux.ibm.com> <87v92g3h9l.fsf@redhat.com> <20211002082128-mutt-send-email-mst@kernel.org> <87pmsl2rzd.fsf@redhat.com> <20211004112528.74442e52.pasic@linux.ibm.com> User-Agent: Notmuch/0.32.1 (https://notmuchmail.org) Date: Mon, 04 Oct 2021 11:51:28 +0200 Message-ID: <87mtnp2k4f.fsf@redhat.com> MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 04 2021, Halil Pasic wrote: > On Mon, 04 Oct 2021 09:01:42 +0200 > Cornelia Huck wrote: > >> On Sat, Oct 02 2021, "Michael S. Tsirkin" wrote: >> >> > On Fri, Oct 01, 2021 at 05:18:46PM +0200, Cornelia Huck wrote: >> >> I'd say we need a hack here so that we assume little-endian config space >> >> if VERSION_1 has been offered; if your patch here works, I assume QEMU >> >> does what we expect (assmuming little-endian as well.) I'm mostly >> >> wondering what happens if you use a different VMM; can we expect it to >> >> work similar to QEMU? >> > >> > Hard to say of course ... hopefully other VMMs are actually >> > implementing the spec. E.g. IIUC rust vmm is modern only. >> >> Yes, I kind of hope they are simply doing LE config space accesses. >> >> Are there any other VMMs that are actually supported on s390x (or other >> BE architectures)? >> > > I think zCX (z/OS Container Extensions) is relevant as it uses virtio. > That is all I know about. Ok, I'll assume that you (IBM) will be able to verify that any fixup will continue to work there.