From patchwork Wed Dec 21 06:52:25 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liang Li X-Patchwork-Id: 9482623 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 4949960237 for ; Wed, 21 Dec 2016 06:59:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3B1472808F for ; Wed, 21 Dec 2016 06:59:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2FC572811D; Wed, 21 Dec 2016 06:59:17 +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=ham 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 D3FD328138 for ; Wed, 21 Dec 2016 06:59:16 +0000 (UTC) Received: from localhost ([::1]:55476 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cJars-0007Y7-29 for patchwork-qemu-devel@patchwork.kernel.org; Wed, 21 Dec 2016 01:59:16 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52822) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cJarO-0007WQ-Rq for qemu-devel@nongnu.org; Wed, 21 Dec 2016 01:58:47 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cJarL-0006fu-Pq for qemu-devel@nongnu.org; Wed, 21 Dec 2016 01:58:46 -0500 Received: from mga07.intel.com ([134.134.136.100]:13473) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cJarL-0006ff-Gx for qemu-devel@nongnu.org; Wed, 21 Dec 2016 01:58:43 -0500 Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga105.jf.intel.com with ESMTP; 20 Dec 2016 22:58:42 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,382,1477983600"; d="scan'208";a="914689143" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by orsmga003.jf.intel.com with ESMTP; 20 Dec 2016 22:58:39 -0800 From: Liang Li To: kvm@vger.kernel.org Date: Wed, 21 Dec 2016 14:52:25 +0800 Message-Id: <1482303148-22059-3-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> 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 v6 kernel 2/5] 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: aarcange@redhat.com, virtio-dev@lists.oasis-open.org, cornelia.huck@de.ibm.com, quintela@redhat.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, mst@redhat.com, david@redhat.com, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, amit.shah@redhat.com, pbonzini@redhat.com, Liang Li , dgilbert@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Add a new feature which supports sending the page information with range array. The current implementation uses PFNs array, which is not very efficient. Using ranges can improve the performance of inflating/deflating significantly. Signed-off-by: Liang Li 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 | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h index 343d7dd..2f850bf 100644 --- a/include/uapi/linux/virtio_balloon.h +++ b/include/uapi/linux/virtio_balloon.h @@ -34,10 +34,14 @@ #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_RANGE 3 /* Send page info with ranges */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12 +/* Bits width for the length of the pfn range */ +#define VIRTIO_BALLOON_NR_PFN_BITS 12 + struct virtio_balloon_config { /* Number of pages host wants Guest to give up. */ __u32 num_pages; @@ -82,4 +86,12 @@ 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 */ +}; + #endif /* _LINUX_VIRTIO_BALLOON_H */