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 49613C433F5 for ; Mon, 4 Oct 2021 07:02:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 316A861154 for ; Mon, 4 Oct 2021 07:02:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232931AbhJDHDs (ORCPT ); Mon, 4 Oct 2021 03:03:48 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:59685 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232297AbhJDHDn (ORCPT ); Mon, 4 Oct 2021 03:03:43 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1633330914; 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=W/XfU4rWvDAgggUknehKIH8tN+C4S9auUfbUS+SGc1Y=; b=Nx8a1I0q8zI++hdRCwsDmlLz+25pjLsE13NM33Y7xIYEqi47Rp/GCXjIeUU331iXYYkQNO upacob8FpM3LDn2u9tynDC6M0lmKa2x28gVwBzXZ25XD4s1o421O39PgZRlSikj6hih91Y 2M2uNRNmZGXIf42b3wBhcjGiL78QwWk= 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-8-HVuoH5hPNc2doNzFCNwWqQ-1; Mon, 04 Oct 2021 03:01:51 -0400 X-MC-Unique: HVuoH5hPNc2doNzFCNwWqQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id CB74B91274; Mon, 4 Oct 2021 07:01:48 +0000 (UTC) Received: from localhost (unknown [10.39.193.66]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D20AF51DFA; Mon, 4 Oct 2021 07:01:44 +0000 (UTC) From: Cornelia Huck To: "Michael S. Tsirkin" Cc: Halil Pasic , 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 Subject: Re: [RFC PATCH 1/1] virtio: write back features before verify In-Reply-To: <20211002082128-mutt-send-email-mst@kernel.org> 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> User-Agent: Notmuch/0.32.1 (https://notmuchmail.org) Date: Mon, 04 Oct 2021 09:01:42 +0200 Message-ID: <87pmsl2rzd.fsf@redhat.com> MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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)?