From patchwork Fri Oct 21 06:24:35 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: 684912 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 3t0bc25k4Jz9rxv for ; Fri, 21 Oct 2016 17:38:42 +1100 (AEDT) Received: from localhost ([::1]:58876 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bxTTT-0007SG-K7 for incoming@patchwork.ozlabs.org; Fri, 21 Oct 2016 02:38:39 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37171) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bxTRz-0006K0-B6 for qemu-devel@nongnu.org; Fri, 21 Oct 2016 02:37:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bxTRy-000698-Ek for qemu-devel@nongnu.org; Fri, 21 Oct 2016 02:37:07 -0400 Received: from mga01.intel.com ([192.55.52.88]:30158) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1bxTRy-00065C-4i for qemu-devel@nongnu.org; Fri, 21 Oct 2016 02:37:06 -0400 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga101.fm.intel.com with ESMTP; 20 Oct 2016 23:37:05 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,375,1473145200"; d="scan'208";a="182201017" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by fmsmga004.fm.intel.com with ESMTP; 20 Oct 2016 23:37:03 -0700 From: Liang Li To: mst@redhat.com Date: Fri, 21 Oct 2016 14:24:35 +0800 Message-Id: <1477031080-12616-3-git-send-email-liang.z.li@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1477031080-12616-1-git-send-email-liang.z.li@intel.com> References: <1477031080-12616-1-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] [RESEND PATCH v3 kernel 2/7] virtio-balloon: define new feature bit and page bitmap head 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@redhat.com, Liang Li , dave.hansen@intel.com, qemu-devel@nongnu.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, cornelia.huck@de.ibm.com, pbonzini@redhat.com, virtualization@lists.linux-foundation.org, dgilbert@redhat.com 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 --- 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..d3b182a 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)); +/* Page bitmap header structure */ +struct balloon_bmap_hdr { + /* Used to distinguish different request */ + __virtio16 cmd; + /* Shift width of page in the bitmap */ + __virtio16 page_shift; + /* flag used to identify different status */ + __virtio16 flag; + /* Reserved */ + __virtio16 reserved; + /* ID of the request */ + __virtio64 req_id; + /* The pfn of 0 bit in the bitmap */ + __virtio64 start_pfn; + /* The length of the bitmap, in bytes */ + __virtio64 bmap_len; +}; + #endif /* _LINUX_VIRTIO_BALLOON_H */