From patchwork Wed Nov 2 06:17:26 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liang Li X-Patchwork-Id: 9408611 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 A344E601C2 for ; Wed, 2 Nov 2016 06:36:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 91519296FB for ; Wed, 2 Nov 2016 06:36:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 839CC29E4C; Wed, 2 Nov 2016 06:36:30 +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 lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B89A1296FB for ; Wed, 2 Nov 2016 06:36:29 +0000 (UTC) Received: from localhost ([::1]:52872 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c1p9w-0007AC-Ky for patchwork-qemu-devel@patchwork.kernel.org; Wed, 02 Nov 2016 02:36:28 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56559) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c1p4e-00031h-Rt for qemu-devel@nongnu.org; Wed, 02 Nov 2016 02:31:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c1p4a-0004qQ-SX for qemu-devel@nongnu.org; Wed, 02 Nov 2016 02:31:00 -0400 Received: from mga01.intel.com ([192.55.52.88]:55377) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1c1p4a-0004q7-D7 for qemu-devel@nongnu.org; Wed, 02 Nov 2016 02:30:56 -0400 Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga101.fm.intel.com with ESMTP; 01 Nov 2016 23:30:55 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,583,1473145200"; d="scan'208";a="26466836" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by orsmga005.jf.intel.com with ESMTP; 01 Nov 2016 23:30:51 -0700 From: Liang Li To: mst@redhat.com, dave.hansen@intel.com Date: Wed, 2 Nov 2016 14:17:26 +0800 Message-Id: <1478067447-24654-7-git-send-email-liang.z.li@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1478067447-24654-1-git-send-email-liang.z.li@intel.com> References: <1478067447-24654-1-git-send-email-liang.z.li@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.88 Subject: [Qemu-devel] [PATCH kernel v4 6/7] virtio-balloon: define flags and head for host request vq X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: virtio-dev@lists.oasis-open.org, cornelia.huck@de.ibm.com, kvm@vger.kernel.org, quintela@redhat.com, linux-kernel@vger.kernel.org, Liang Li , qemu-devel@nongnu.org, dgilbert@redhat.com, linux-mm@kvack.org, amit.shah@redhat.com, pbonzini@redhat.com, Andrew Morton , virtualization@lists.linux-foundation.org, mgorman@techsingularity.net Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" 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 --- 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 bed6f41..c4e34d0 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_BITMAP 3 /* Send page info with bitmap */ +#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 @@ -101,4 +102,25 @@ struct virtio_balloon_bmap_hdr { __le64 bmap[0]; }; +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 */