From patchwork Wed Jul 27 01:23:34 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: 653041 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 3rzczS2BWWz9t1k for ; Wed, 27 Jul 2016 11:36:52 +1000 (AEST) Received: from localhost ([::1]:43223 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bSDmD-0008NA-U3 for incoming@patchwork.ozlabs.org; Tue, 26 Jul 2016 21:36:49 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49387) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bSDgn-0003F3-Mg for qemu-devel@nongnu.org; Tue, 26 Jul 2016 21:31:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bSDgk-0001CC-LQ for qemu-devel@nongnu.org; Tue, 26 Jul 2016 21:31:13 -0400 Received: from mga14.intel.com ([192.55.52.115]:14369) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bSDgk-0001C4-Fs for qemu-devel@nongnu.org; Tue, 26 Jul 2016 21:31:10 -0400 Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga103.fm.intel.com with ESMTP; 26 Jul 2016 18:31:10 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,427,1464678000"; d="scan'208";a="740224013" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by FMSMGA003.fm.intel.com with ESMTP; 26 Jul 2016 18:31:07 -0700 From: Liang Li To: linux-kernel@vger.kernel.org Date: Wed, 27 Jul 2016 09:23:34 +0800 Message-Id: <1469582616-5729-6-git-send-email-liang.z.li@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1469582616-5729-1-git-send-email-liang.z.li@intel.com> References: <1469582616-5729-1-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: 192.55.52.115 Subject: [Qemu-devel] [PATCH v2 repost 5/7] virtio-balloon: define feature bit and head for misc virt queue 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, kvm@vger.kernel.org, quintela@redhat.com, Amit Shah , Liang Li , qemu-devel@nongnu.org, dgilbert@redhat.com, linux-mm@kvack.org, "Michael S. Tsirkin" , Cornelia Huck , Paolo Bonzini , virtualization@lists.linux-foundation.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Define a new feature bit which supports a new virtual queue. This new virtual qeuque is for information exchange between hypervisor and guest. The VMM hypervisor 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 VMM hypervisor can get some of guest's runtime information through this virtual queue, e.g. the guest's free page information, which can be used for live migration optimization. Signed-off-by: Liang Li Cc: Michael S. Tsirkin Cc: Paolo Bonzini Cc: Cornelia Huck Cc: Amit Shah --- 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 d3b182a..be4880f 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_MISC_VQ 4 /* Misc info virtqueue */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12 @@ -101,4 +102,25 @@ struct balloon_bmap_hdr { __virtio64 bmap_len; }; +enum balloon_req_id { + /* Get free pages information */ + BALLOON_GET_FREE_PAGES, +}; + +enum balloon_flag { + /* Have more data for a request */ + BALLOON_FLAG_CONT, + /* No more data for a request */ + BALLOON_FLAG_DONE, +}; + +struct balloon_req_hdr { + /* Used to distinguish different request */ + __virtio16 cmd; + /* Reserved */ + __virtio16 reserved[3]; + /* Request parameter */ + __virtio64 param; +}; + #endif /* _LINUX_VIRTIO_BALLOON_H */