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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 425F7C43387 for ; Fri, 4 Jan 2019 12:39:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 147F921871 for ; Fri, 4 Jan 2019 12:39:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726686AbfADMjr (ORCPT ); Fri, 4 Jan 2019 07:39:47 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33916 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726296AbfADMjr (ORCPT ); Fri, 4 Jan 2019 07:39:47 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 189A97F3EC; Fri, 4 Jan 2019 12:39:47 +0000 (UTC) Received: from gondolin (dhcp-192-187.str.redhat.com [10.33.192.187]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7271B5D6A6; Fri, 4 Jan 2019 12:39:41 +0000 (UTC) Date: Fri, 4 Jan 2019 13:39:39 +0100 From: Cornelia Huck To: "Michael S. Tsirkin" Cc: Jason Wang , virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, virtio-dev@lists.oasis-open.org, Wei Wang , Halil Pasic Subject: Re: [PATCH 2/2] virtio: document virtio_config_ops restrictions Message-ID: <20190104133939.7d52ebb3.cohuck@redhat.com> In-Reply-To: <20190103112627-mutt-send-email-mst@kernel.org> References: <20190103160804.21438-1-cohuck@redhat.com> <20190103160804.21438-3-cohuck@redhat.com> <20190103112627-mutt-send-email-mst@kernel.org> Organization: Red Hat GmbH MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Fri, 04 Jan 2019 12:39:47 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 3 Jan 2019 11:28:28 -0500 "Michael S. Tsirkin" wrote: > On Thu, Jan 03, 2019 at 05:08:04PM +0100, Cornelia Huck wrote: > > Some transports (e.g. virtio-ccw) implement virtio operations that > > seem to be a simple read/write as something more involved that > > cannot be done from an atomic context. > > > > Give at least a hint about that. > > > > Signed-off-by: Cornelia Huck > > --- > > include/linux/virtio_config.h | 5 +++++ > > 1 file changed, 5 insertions(+) > > > > diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h > > index 7087ef946ba7..987b6491b946 100644 > > --- a/include/linux/virtio_config.h > > +++ b/include/linux/virtio_config.h > > @@ -12,6 +12,11 @@ struct irq_affinity; > > > > /** > > * virtio_config_ops - operations for configuring a virtio device > > + * Note: Do not assume that a transport implements all of the operations > > + * getting/setting a value as a simple read/write! Generally speaking, > > + * any of @get/@set, @get_status/@set_status, or @get_features/ > > + * @finalize_features are NOT safe to be called from an atomic > > + * context. > > * @get: read the value of a configuration field > > * vdev: the virtio_device > > * offset: the offset of the configuration field > > Then might_sleep in virtio_cread/virtio_cwrite and > friends would be appropriate? I guess we'll need to fix > balloon first. Yes, it makes sense to go over the code and add might_sleep to functions where it makes sense after the balloon changes have been merged.