From patchwork Wed Nov 2 06:17:22 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: 690264 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 3t7yvF0lJQz9vDY for ; Wed, 2 Nov 2016 17:32:25 +1100 (AEDT) Received: from localhost ([::1]:52845 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c1p5x-00048O-Oh for incoming@patchwork.ozlabs.org; Wed, 02 Nov 2016 02:32:21 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56473) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c1p4O-0002rZ-DO for qemu-devel@nongnu.org; Wed, 02 Nov 2016 02:30:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c1p4J-0004lD-EQ for qemu-devel@nongnu.org; Wed, 02 Nov 2016 02:30:44 -0400 Received: from mga14.intel.com ([192.55.52.115]:1329) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1c1p4J-0004kp-5l for qemu-devel@nongnu.org; Wed, 02 Nov 2016 02:30:39 -0400 Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga103.fm.intel.com with ESMTP; 01 Nov 2016 23:30:38 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,583,1473145200"; d="scan'208";a="26774432" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by orsmga004.jf.intel.com with ESMTP; 01 Nov 2016 23:30:34 -0700 From: Liang Li To: mst@redhat.com, dave.hansen@intel.com Date: Wed, 2 Nov 2016 14:17:22 +0800 Message-Id: <1478067447-24654-3-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: 192.55.52.115 Subject: [Qemu-devel] [PATCH kernel v4 2/7] virtio-balloon: define new feature bit and head struct 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, virtualization@lists.linux-foundation.org, mgorman@techsingularity.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Add a new feature which supports sending the page information with a bitmap. The current implementation uses PFNs array, which is not very efficient. Using bitmap can improve the performance of inflating/deflating significantly The page bitmap header will used to tell the host some information about the page bitmap. e.g. the page size, page bitmap length and start pfn. Signed-off-by: Liang Li Cc: Michael S. Tsirkin Cc: Paolo Bonzini Cc: Cornelia Huck Cc: Amit Shah Cc: Dave Hansen --- include/uapi/linux/virtio_balloon.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h index 343d7dd..bed6f41 100644 --- a/include/uapi/linux/virtio_balloon.h +++ b/include/uapi/linux/virtio_balloon.h @@ -34,6 +34,7 @@ #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ #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 */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12 @@ -82,4 +83,22 @@ struct virtio_balloon_stat { __virtio64 val; } __attribute__((packed)); +/* Response header structure */ +struct virtio_balloon_resp_hdr { + __le64 cmd : 8; /* Distinguish different requests type */ + __le64 flag: 8; /* Mark status for a specific request type */ + __le64 id : 16; /* Distinguish requests of a specific type */ + __le64 data_len: 32; /* Length of the following data, in bytes */ +}; + +/* Page bitmap header structure */ +struct virtio_balloon_bmap_hdr { + struct { + __le64 start_pfn : 52; /* start pfn for the bitmap */ + __le64 page_shift : 6; /* page shift width, in bytes */ + __le64 bmap_len : 6; /* bitmap length, in bytes */ + } head; + __le64 bmap[0]; +}; + #endif /* _LINUX_VIRTIO_BALLOON_H */