From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f72.google.com (mail-pg0-f72.google.com [74.125.83.72]) by kanga.kvack.org (Postfix) with ESMTP id 97C516B0371 for ; Wed, 21 Dec 2016 01:58:43 -0500 (EST) Received: by mail-pg0-f72.google.com with SMTP id 5so351773214pgi.2 for ; Tue, 20 Dec 2016 22:58:43 -0800 (PST) Received: from mga04.intel.com (mga04.intel.com. [192.55.52.120]) by mx.google.com with ESMTPS id m25si25519639pli.104.2016.12.20.22.58.42 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 20 Dec 2016 22:58:42 -0800 (PST) From: Liang Li Subject: [PATCH v6 kernel 2/5] virtio-balloon: define new feature bit and head struct Date: Wed, 21 Dec 2016 14:52:25 +0800 Message-Id: <1482303148-22059-3-git-send-email-liang.z.li@intel.com> 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> Sender: owner-linux-mm@kvack.org List-ID: To: kvm@vger.kernel.org Cc: virtio-dev@lists.oasis-open.org, qemu-devel@nongnu.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, amit.shah@redhat.com, dave.hansen@intel.com, cornelia.huck@de.ibm.com, pbonzini@redhat.com, mst@redhat.com, david@redhat.com, aarcange@redhat.com, dgilbert@redhat.com, quintela@redhat.com, Liang Li 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 */ -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org