From patchwork Wed Dec 21 06:52:27 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liang Li X-Patchwork-Id: 9482629 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B7F5260237 for ; Wed, 21 Dec 2016 06:59:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A97A2280F4 for ; Wed, 21 Dec 2016 06:59:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9E6EB2811C; Wed, 21 Dec 2016 06:59:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 18DE5280F4 for ; Wed, 21 Dec 2016 06:59:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932763AbcLUG66 (ORCPT ); Wed, 21 Dec 2016 01:58:58 -0500 Received: from mga03.intel.com ([134.134.136.65]:10187 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932571AbcLUG6z (ORCPT ); Wed, 21 Dec 2016 01:58:55 -0500 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga103.jf.intel.com with ESMTP; 20 Dec 2016 22:58:54 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,382,1477983600"; d="scan'208";a="1074710758" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by orsmga001.jf.intel.com with ESMTP; 20 Dec 2016 22:58:46 -0800 From: Liang Li To: kvm@vger.kernel.org Cc: virtio-dev@lists.oasis-open.org, qemu-devel@nongnu.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, amit.shah@redhat.com, dave.hansen@intel.com, cornelia.huck@de.ibm.com, pbonzini@redhat.com, mst@redhat.com, david@redhat.com, aarcange@redhat.com, dgilbert@redhat.com, quintela@redhat.com, Liang Li , Andrew Morton , Mel Gorman Subject: [PATCH v6 kernel 4/5] virtio-balloon: define flags and head for host request vq Date: Wed, 21 Dec 2016 14:52:27 +0800 Message-Id: <1482303148-22059-5-git-send-email-liang.z.li@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1482303148-22059-1-git-send-email-liang.z.li@intel.com> References: <1482303148-22059-1-git-send-email-liang.z.li@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Define the flags and head struct for a new host request virtual queue. Guest can get requests from host and then responds to them on this new virtual queue. Host can make use of this virtual queue to request the guest do some operations, e.g. drop page cache, synchronize file system, etc. And the hypervisor can get some of guest's runtime information through this virtual queue too, e.g. the guest's unused page information, which can be used for live migration optimization. Signed-off-by: Liang Li Cc: Andrew Morton Cc: Mel Gorman Cc: Michael S. Tsirkin Cc: Paolo Bonzini Cc: Cornelia Huck Cc: Amit Shah Cc: Dave Hansen Cc: Andrea Arcangeli Cc: David Hildenbrand --- include/uapi/linux/virtio_balloon.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h index 2f850bf..b367020 100644 --- a/include/uapi/linux/virtio_balloon.h +++ b/include/uapi/linux/virtio_balloon.h @@ -35,6 +35,7 @@ #define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */ #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ #define VIRTIO_BALLOON_F_PAGE_RANGE 3 /* Send page info with ranges */ +#define VIRTIO_BALLOON_F_HOST_REQ_VQ 4 /* Host request virtqueue */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12 @@ -94,4 +95,25 @@ struct virtio_balloon_resp_hdr { __le64 data_len: 32; /* Length of the following data, in bytes */ }; +enum virtio_balloon_req_id { + /* Get unused page information */ + BALLOON_GET_UNUSED_PAGES, +}; + +enum virtio_balloon_flag { + /* Have more data for a request */ + BALLOON_FLAG_CONT, + /* No more data for a request */ + BALLOON_FLAG_DONE, +}; + +struct virtio_balloon_req_hdr { + /* Used to distinguish different requests */ + __le16 cmd; + /* Reserved */ + __le16 reserved[3]; + /* Request parameter */ + __le64 param; +}; + #endif /* _LINUX_VIRTIO_BALLOON_H */