From patchwork Wed Nov 30 08:43:16 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Liang Z" X-Patchwork-Id: 700905 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3tTF1r1kYYz9vFj for ; Wed, 30 Nov 2016 20:07:59 +1100 (AEDT) Received: from localhost ([::1]:42100 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cC0rs-0003gA-QL for incoming@patchwork.ozlabs.org; Wed, 30 Nov 2016 04:07:56 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54390) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cC0ij-0005gE-50 for qemu-devel@nongnu.org; Wed, 30 Nov 2016 03:58:30 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cC0if-0001KM-8G for qemu-devel@nongnu.org; Wed, 30 Nov 2016 03:58:29 -0500 Received: from mga07.intel.com ([134.134.136.100]:41055) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cC0ie-0001Jd-Vu for qemu-devel@nongnu.org; Wed, 30 Nov 2016 03:58:25 -0500 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga105.jf.intel.com with ESMTP; 30 Nov 2016 00:58:23 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.31,573,1473145200"; d="scan'208"; a="1066059240" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by orsmga001.jf.intel.com with ESMTP; 30 Nov 2016 00:58:20 -0800 From: Liang Li To: kvm@vger.kernel.org Date: Wed, 30 Nov 2016 16:43:16 +0800 Message-Id: <1480495397-23225-5-git-send-email-liang.z.li@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1480495397-23225-1-git-send-email-liang.z.li@intel.com> References: <1480495397-23225-1-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: 134.134.136.100 Subject: [Qemu-devel] [PATCH kernel v5 4/5] 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, mhocko@suse.com, Amit Shah , quintela@redhat.com, Mel Gorman , jasowang@redhat.com, mst@redhat.com, dave.hansen@intel.com, qemu-devel@nongnu.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kirill.shutemov@linux.intel.com, Cornelia Huck , pbonzini@redhat.com, akpm@linux-foundation.org, virtualization@lists.linux-foundation.org, Liang Li , dgilbert@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" 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 1be4b1f..5ac3a40 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 */