From patchwork Wed Aug 3 12:25:47 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhanghailiang X-Patchwork-Id: 9261203 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 8143D60865 for ; Wed, 3 Aug 2016 12:59:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7025F28335 for ; Wed, 3 Aug 2016 12:59:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6382328580; Wed, 3 Aug 2016 12:59:39 +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 7255A28335 for ; Wed, 3 Aug 2016 12:59:38 +0000 (UTC) Received: from localhost ([::1]:34335 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bUvlp-0001z4-JR for patchwork-qemu-devel@patchwork.kernel.org; Wed, 03 Aug 2016 08:59:37 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:32815) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bUvGq-0001FK-Op for qemu-devel@nongnu.org; Wed, 03 Aug 2016 08:27:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bUvGm-0006jA-Fu for qemu-devel@nongnu.org; Wed, 03 Aug 2016 08:27:35 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:42808) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bUvGH-0006Ym-6a for qemu-devel@nongnu.org; Wed, 03 Aug 2016 08:27:32 -0400 Received: from 172.24.1.47 (EHLO szxeml428-hub.china.huawei.com) ([172.24.1.47]) by szxrg03-dlp.huawei.com (MOS 4.4.3-GA FastPath queued) with ESMTP id CFU48212; Wed, 03 Aug 2016 20:26:38 +0800 (CST) Received: from localhost (10.177.24.212) by szxeml428-hub.china.huawei.com (10.82.67.183) with Microsoft SMTP Server id 14.3.235.1; Wed, 3 Aug 2016 20:26:30 +0800 From: zhanghailiang To: Date: Wed, 3 Aug 2016 20:25:47 +0800 Message-ID: <1470227172-13704-10-git-send-email-zhang.zhanghailiang@huawei.com> X-Mailer: git-send-email 2.7.2.windows.1 In-Reply-To: <1470227172-13704-1-git-send-email-zhang.zhanghailiang@huawei.com> References: <1470227172-13704-1-git-send-email-zhang.zhanghailiang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.177.24.212] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0204.57A1E301.0010, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 06e31f2de0ea79f9d5ff1337b238c942 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 119.145.14.66 Subject: [Qemu-devel] [PATCH COLO-Frame v18 09/34] COLO: Save PVM state to secondary side when do checkpoint 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: xiecl.fnst@cn.fujitsu.com, lizhijian@cn.fujitsu.com, quintela@redhat.com, eddie.dong@intel.com, peter.huangpeng@huawei.com, dgilbert@redhat.com, Gonglei , amit.shah@redhat.com, zhangchen.fnst@cn.fujitsu.com, zhanghailiang Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP The main process of the checkpoint is to synchronize SVM with PVM. VM's state includes ram and device state. So we will migrate PVM's state to SVM when do checkpoint, just like migration does. We will cache PVM's state in slave, we use QEMUSizedBuffer to store the data, we need to know the size of VM state, so in master, we use qsb to store VM state temporarily, get the data size by call qsb_get_length() and then migrate the data to the qsb in the secondary side. Signed-off-by: zhanghailiang Signed-off-by: Gonglei Signed-off-by: Li Zhijian Reviewed-by: Dr. David Alan Gilbert Cc: Dr. David Alan Gilbert --- v17: - Rebase to master, use the new channel-buffer API v16: - Rename colo_put_cmd_value() to colo_send_message_value() v13: - Refactor colo_put_cmd_value() to use 'Error **errp' to indicate success or failure. v12: - Replace the old colo_ctl_get() with the new helper function colo_put_cmd_value() v11: - Add Reviewed-by tag --- migration/colo.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++------ migration/ram.c | 39 +++++++++++++++++++------- 2 files changed, 104 insertions(+), 18 deletions(-) diff --git a/migration/colo.c b/migration/colo.c index 1cf0159..ec43250 100644 --- a/migration/colo.c +++ b/migration/colo.c @@ -13,10 +13,13 @@ #include "qemu/osdep.h" #include "sysemu/sysemu.h" #include "migration/colo.h" +#include "io/channel-buffer.h" #include "trace.h" #include "qemu/error-report.h" #include "qapi/error.h" +#define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024) + bool colo_supported(void) { return true; @@ -55,6 +58,27 @@ static void colo_send_message(QEMUFile *f, COLOMessage msg, trace_colo_send_message(COLOMessage_lookup[msg]); } +static void colo_send_message_value(QEMUFile *f, COLOMessage msg, + uint64_t value, Error **errp) +{ + Error *local_err = NULL; + int ret; + + colo_send_message(f, msg, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + qemu_put_be64(f, value); + qemu_fflush(f); + + ret = qemu_file_get_error(f); + if (ret < 0) { + error_setg_errno(errp, -ret, "Failed to send value for message:%s", + COLOMessage_lookup[msg]); + } +} + static COLOMessage colo_receive_message(QEMUFile *f, Error **errp) { COLOMessage msg; @@ -91,9 +115,12 @@ static void colo_receive_check_message(QEMUFile *f, COLOMessage expect_msg, } } -static int colo_do_checkpoint_transaction(MigrationState *s) +static int colo_do_checkpoint_transaction(MigrationState *s, + QIOChannelBuffer *bioc, + QEMUFile *fb) { Error *local_err = NULL; + int ret = -1; colo_send_message(s->to_dst_file, COLO_MESSAGE_CHECKPOINT_REQUEST, &local_err); @@ -106,15 +133,46 @@ static int colo_do_checkpoint_transaction(MigrationState *s) if (local_err) { goto out; } + /* Reset channel-buffer directly */ + qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL); + bioc->usage = 0; + + qemu_mutex_lock_iothread(); + vm_stop_force_state(RUN_STATE_COLO); + qemu_mutex_unlock_iothread(); + trace_colo_vm_state_change("run", "stop"); - /* TODO: suspend and save vm state to colo buffer */ + /* Disable block migration */ + s->params.blk = 0; + s->params.shared = 0; + qemu_savevm_state_header(fb); + qemu_savevm_state_begin(fb, &s->params); + qemu_mutex_lock_iothread(); + qemu_savevm_state_complete_precopy(fb, false); + qemu_mutex_unlock_iothread(); + + qemu_fflush(fb); colo_send_message(s->to_dst_file, COLO_MESSAGE_VMSTATE_SEND, &local_err); if (local_err) { goto out; } + /* + * We need the size of the VMstate data in Secondary side, + * With which we can decide how much data should be read. + */ + colo_send_message_value(s->to_dst_file, COLO_MESSAGE_VMSTATE_SIZE, + bioc->usage, &local_err); + if (local_err) { + goto out; + } - /* TODO: send vmstate to Secondary */ + qemu_put_buffer(s->to_dst_file, bioc->data, bioc->usage); + qemu_fflush(s->to_dst_file); + ret = qemu_file_get_error(s->to_dst_file); + if (ret < 0) { + goto out; + } colo_receive_check_message(s->rp_state.from_dst_file, COLO_MESSAGE_VMSTATE_RECEIVED, &local_err); @@ -128,18 +186,24 @@ static int colo_do_checkpoint_transaction(MigrationState *s) goto out; } - /* TODO: resume Primary */ + ret = 0; + + qemu_mutex_lock_iothread(); + vm_start(); + qemu_mutex_unlock_iothread(); + trace_colo_vm_state_change("stop", "run"); - return 0; out: if (local_err) { error_report_err(local_err); } - return -EINVAL; + return ret; } static void colo_process_checkpoint(MigrationState *s) { + QIOChannelBuffer *bioc; + QEMUFile *fb = NULL; Error *local_err = NULL; int ret; @@ -158,6 +222,9 @@ static void colo_process_checkpoint(MigrationState *s) if (local_err) { goto out; } + bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE); + fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc)); + object_unref(OBJECT(bioc)); qemu_mutex_lock_iothread(); vm_start(); @@ -165,7 +232,7 @@ static void colo_process_checkpoint(MigrationState *s) trace_colo_vm_state_change("stop", "run"); while (s->state == MIGRATION_STATUS_COLO) { - ret = colo_do_checkpoint_transaction(s); + ret = colo_do_checkpoint_transaction(s, bioc, fb); if (ret < 0) { goto out; } @@ -178,7 +245,7 @@ out: } migrate_set_state(&s->state, MIGRATION_STATUS_COLO, MIGRATION_STATUS_COMPLETED); - + qemu_fclose(fb); if (s->rp_state.from_dst_file) { qemu_fclose(s->rp_state.from_dst_file); } diff --git a/migration/ram.c b/migration/ram.c index 815bc0e..e9067c5 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -43,6 +43,7 @@ #include "trace.h" #include "exec/ram_addr.h" #include "qemu/rcu_queue.h" +#include "migration/colo.h" #ifdef DEBUG_MIGRATION_RAM #define DPRINTF(fmt, ...) \ @@ -1868,16 +1869,8 @@ err: return ret; } - -/* Each of ram_save_setup, ram_save_iterate and ram_save_complete has - * long-running RCU critical section. When rcu-reclaims in the code - * start to become numerous it will be necessary to reduce the - * granularity of these critical sections. - */ - -static int ram_save_setup(QEMUFile *f, void *opaque) +static int ram_save_init_globals(void) { - RAMBlock *block; int64_t ram_bitmap_pages; /* Size of bitmap in pages, including gaps */ dirty_rate_high_cnt = 0; @@ -1943,6 +1936,31 @@ static int ram_save_setup(QEMUFile *f, void *opaque) migration_bitmap_sync(); qemu_mutex_unlock_ramlist(); qemu_mutex_unlock_iothread(); + rcu_read_unlock(); + + return 0; +} + +/* Each of ram_save_setup, ram_save_iterate and ram_save_complete has + * long-running RCU critical section. When rcu-reclaims in the code + * start to become numerous it will be necessary to reduce the + * granularity of these critical sections. + */ + +static int ram_save_setup(QEMUFile *f, void *opaque) +{ + RAMBlock *block; + + /* + * migration has already setup the bitmap, reuse it. + */ + if (!migration_in_colo_state()) { + if (ram_save_init_globals() < 0) { + return -1; + } + } + + rcu_read_lock(); qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE); @@ -2044,7 +2062,8 @@ static int ram_save_complete(QEMUFile *f, void *opaque) while (true) { int pages; - pages = ram_find_and_save_block(f, true, &bytes_transferred); + pages = ram_find_and_save_block(f, !migration_in_colo_state(), + &bytes_transferred); /* no more blocks to sent */ if (pages == 0) { break;