From patchwork Wed Dec 13 02:29:02 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Liu, Changpeng" X-Patchwork-Id: 10108877 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 8E68C6032B for ; Wed, 13 Dec 2017 02:27:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 78DBE29053 for ; Wed, 13 Dec 2017 02:27:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6D97E290EA; Wed, 13 Dec 2017 02:27:03 +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 D950D290C2 for ; Wed, 13 Dec 2017 02:27:02 +0000 (UTC) Received: from localhost ([::1]:33226 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eOwlC-0003ff-6e for patchwork-qemu-devel@patchwork.kernel.org; Tue, 12 Dec 2017 21:27:02 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56940) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eOwjs-0002nd-N0 for qemu-devel@nongnu.org; Tue, 12 Dec 2017 21:25:42 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eOwjr-0007Bw-1z for qemu-devel@nongnu.org; Tue, 12 Dec 2017 21:25:40 -0500 Received: from mga12.intel.com ([192.55.52.136]:24573) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eOwjq-0007Aj-NL for qemu-devel@nongnu.org; Tue, 12 Dec 2017 21:25:38 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Dec 2017 18:25:38 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.45,396,1508828400"; d="scan'208";a="17762122" Received: from fedora.sh.intel.com ([10.67.114.176]) by orsmga002.jf.intel.com with ESMTP; 12 Dec 2017 18:25:35 -0800 From: Changpeng Liu To: changpeng.liu@intel.com, qemu-devel@nongnu.org Date: Wed, 13 Dec 2017 10:29:02 +0800 Message-Id: <1513132143-10758-4-git-send-email-changpeng.liu@intel.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1513132143-10758-1-git-send-email-changpeng.liu@intel.com> References: <1513132143-10758-1-git-send-email-changpeng.liu@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.136 Subject: [Qemu-devel] [PATCH v7 3/4] contrib/libvhost-user: enable virtio config space messages 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: james.r.harris@intel.com, mst@redhat.com, stefanha@gmail.com, pbonzini@redhat.com, felipe@nutanix.com, marcandre.lureau@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Enable VHOST_USER_GET_CONFIG/VHOST_USER_SET_CONFIG/VHOST_USER_SET_CONFIG_FD messages in libvhost-user library, users can implement their own I/O target based on the library. This enable the virtio config space delivered between Qemu host device and the I/O target, also event notifier is added in case of virtio config space changed. Signed-off-by: Changpeng Liu --- contrib/libvhost-user/libvhost-user.c | 80 +++++++++++++++++++++++++++++++++++ contrib/libvhost-user/libvhost-user.h | 36 +++++++++++++++- 2 files changed, 115 insertions(+), 1 deletion(-) diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/libvhost-user.c index f409bd3..5dd00c9 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -84,6 +84,9 @@ vu_request_to_string(unsigned int req) REQ(VHOST_USER_SET_SLAVE_REQ_FD), REQ(VHOST_USER_IOTLB_MSG), REQ(VHOST_USER_SET_VRING_ENDIAN), + REQ(VHOST_USER_GET_CONFIG), + REQ(VHOST_USER_SET_CONFIG), + REQ(VHOST_USER_SET_CONFIG_FD), REQ(VHOST_USER_MAX), }; #undef REQ @@ -798,6 +801,70 @@ vu_set_slave_req_fd(VuDev *dev, VhostUserMsg *vmsg) } static bool +vu_get_config(VuDev *dev, VhostUserMsg *vmsg) +{ + int ret = -1; + + if (dev->iface->get_config) { + ret = dev->iface->get_config(dev, vmsg->payload.config.region, + vmsg->payload.config.size); + } + + if (ret) { + /* resize to zero to indicate an error to master */ + vmsg->size = 0; + } + + return true; +} + +static bool +vu_set_config(VuDev *dev, VhostUserMsg *vmsg) +{ + int ret = -1; + bool reply_supported = !!(dev->protocol_features & + (1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK)); + + if (dev->iface->set_config) { + ret = dev->iface->set_config(dev, vmsg->payload.config.region, + vmsg->payload.config.offset, + vmsg->payload.config.size, + vmsg->payload.config.flags); + } + + vmsg->size = sizeof(vmsg->payload.u64); + if (!ret) { + vmsg->payload.u64 = 0; + } else { + /* indicate an error in case reply supported */ + vmsg->payload.u64 = 1; + } + + if (reply_supported) { + return true; + } + + return false; +} + +static bool +vu_set_config_fd(VuDev *dev, VhostUserMsg *vmsg) +{ + if (vmsg->fd_num != 1) { + vu_panic(dev, "Invalid config_fd message"); + return false; + } + + if (dev->config_fd != -1) { + close(dev->config_fd); + } + dev->config_fd = vmsg->fds[0]; + DPRINT("Got config_fd: %d\n", vmsg->fds[0]); + + return false; +} + +static bool vu_process_message(VuDev *dev, VhostUserMsg *vmsg) { int do_reply = 0; @@ -862,6 +929,12 @@ vu_process_message(VuDev *dev, VhostUserMsg *vmsg) return vu_set_vring_enable_exec(dev, vmsg); case VHOST_USER_SET_SLAVE_REQ_FD: return vu_set_slave_req_fd(dev, vmsg); + case VHOST_USER_GET_CONFIG: + return vu_get_config(dev, vmsg); + case VHOST_USER_SET_CONFIG: + return vu_set_config(dev, vmsg); + case VHOST_USER_SET_CONFIG_FD: + return vu_set_config_fd(dev, vmsg); case VHOST_USER_NONE: break; default: @@ -940,6 +1013,11 @@ vu_deinit(VuDev *dev) dev->slave_fd = -1; } + if (dev->config_fd != -1) { + close(dev->config_fd); + dev->config_fd = -1; + } + if (dev->sock != -1) { close(dev->sock); } @@ -970,6 +1048,8 @@ vu_init(VuDev *dev, dev->iface = iface; dev->log_call_fd = -1; dev->slave_fd = -1; + dev->config_fd = -1; + for (i = 0; i < VHOST_MAX_NR_VIRTQUEUE; i++) { dev->vq[i] = (VuVirtq) { .call_fd = -1, .kick_fd = -1, .err_fd = -1, diff --git a/contrib/libvhost-user/libvhost-user.h b/contrib/libvhost-user/libvhost-user.h index 2f5864b..677389d 100644 --- a/contrib/libvhost-user/libvhost-user.h +++ b/contrib/libvhost-user/libvhost-user.h @@ -30,6 +30,16 @@ #define VHOST_MEMORY_MAX_NREGIONS 8 +typedef enum VhostSetConfigType { + VHOST_SET_CONFIG_TYPE_MASTER = 0, + VHOST_SET_CONFIG_TYPE_MIGRATION = 1, +} VhostSetConfigType; + +/* + * Maximum size of virtio device config space + */ +#define VHOST_USER_MAX_CONFIG_SIZE 256 + enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_MQ = 0, VHOST_USER_PROTOCOL_F_LOG_SHMFD = 1, @@ -38,7 +48,6 @@ enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_NET_MTU = 4, VHOST_USER_PROTOCOL_F_SLAVE_REQ = 5, VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6, - VHOST_USER_PROTOCOL_F_MAX }; @@ -69,6 +78,9 @@ typedef enum VhostUserRequest { VHOST_USER_SET_SLAVE_REQ_FD = 21, VHOST_USER_IOTLB_MSG = 22, VHOST_USER_SET_VRING_ENDIAN = 23, + VHOST_USER_GET_CONFIG = 24, + VHOST_USER_SET_CONFIG = 25, + VHOST_USER_SET_CONFIG_FD = 26, VHOST_USER_MAX } VhostUserRequest; @@ -90,6 +102,18 @@ typedef struct VhostUserLog { uint64_t mmap_offset; } VhostUserLog; +typedef struct VhostUserConfig { + uint32_t offset; + uint32_t size; + uint32_t flags; + uint8_t region[VHOST_USER_MAX_CONFIG_SIZE]; +} VhostUserConfig; + +static VhostUserConfig c __attribute__ ((unused)); +#define VHOST_USER_CONFIG_HDR_SIZE (sizeof(c.offset) \ + + sizeof(c.size) \ + + sizeof(c.flags)) + #if defined(_WIN32) # define VU_PACKED __attribute__((gcc_struct, packed)) #else @@ -112,6 +136,7 @@ typedef struct VhostUserMsg { struct vhost_vring_addr addr; VhostUserMemory memory; VhostUserLog log; + VhostUserConfig config; } payload; int fds[VHOST_MEMORY_MAX_NREGIONS]; @@ -140,6 +165,10 @@ typedef int (*vu_process_msg_cb) (VuDev *dev, VhostUserMsg *vmsg, int *do_reply); typedef void (*vu_queue_set_started_cb) (VuDev *dev, int qidx, bool started); typedef bool (*vu_queue_is_processed_in_order_cb) (VuDev *dev, int qidx); +typedef int (*vu_get_config_cb) (VuDev *dev, uint8_t *config, uint32_t len); +typedef int (*vu_set_config_cb) (VuDev *dev, const uint8_t *data, + uint32_t offset, uint32_t size, + uint32_t flags); typedef struct VuDevIface { /* called by VHOST_USER_GET_FEATURES to get the features bitmask */ @@ -162,6 +191,10 @@ typedef struct VuDevIface { * on unmanaged exit/crash. */ vu_queue_is_processed_in_order_cb queue_is_processed_in_order; + /* get the config space of the device */ + vu_get_config_cb get_config; + /* set the config space of the device */ + vu_set_config_cb set_config; } VuDevIface; typedef void (*vu_queue_handler_cb) (VuDev *dev, int qidx); @@ -227,6 +260,7 @@ struct VuDev { VuVirtq vq[VHOST_MAX_NR_VIRTQUEUE]; int log_call_fd; int slave_fd; + int config_fd; uint64_t log_size; uint8_t *log_table; uint64_t features;