From patchwork Tue Nov 12 17:05:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kirti Wankhede X-Patchwork-Id: 1193737 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=nvidia.com header.i=@nvidia.com header.b="ZJZrCYoG"; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 47CFYj4w1yz9sPc for ; Wed, 13 Nov 2019 04:47:05 +1100 (AEDT) Received: from localhost ([::1]:38466 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iUaFr-00023R-3J for incoming@patchwork.ozlabs.org; Tue, 12 Nov 2019 12:47:03 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:34801) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iUa9h-0003Lu-NX for qemu-devel@nongnu.org; Tue, 12 Nov 2019 12:40:43 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iUa9f-0006IG-H5 for qemu-devel@nongnu.org; Tue, 12 Nov 2019 12:40:41 -0500 Received: from hqemgate14.nvidia.com ([216.228.121.143]:3309) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iUa9d-0006H1-Mp for qemu-devel@nongnu.org; Tue, 12 Nov 2019 12:40:38 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 12 Nov 2019 09:35:37 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 12 Nov 2019 09:35:34 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 12 Nov 2019 09:35:34 -0800 Received: from HQMAIL109.nvidia.com (172.20.187.15) by HQMAIL111.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 12 Nov 2019 17:35:34 +0000 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 12 Nov 2019 17:35:33 +0000 Received: from kwankhede-dev.nvidia.com (10.124.1.5) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Tue, 12 Nov 2019 17:35:27 +0000 From: Kirti Wankhede To: , Subject: [PATCH v9 QEMU 11/15] vfio: Add save state functions to SaveVMHandlers Date: Tue, 12 Nov 2019 22:35:20 +0530 Message-ID: <1573578324-8389-12-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1573578324-8389-1-git-send-email-kwankhede@nvidia.com> References: <1573578324-8389-1-git-send-email-kwankhede@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1573580137; bh=3q4jRvlPhHwGnfkIjJ7IjXpuRsMEdFYcwy0W6oJUmXs=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=ZJZrCYoGeQHN+yIErICClP7OyiZiIVvIT8Y7GxKmz3KIXjFJEwIFKhE9D+KKrWgVL zfkuQXRIGIXahKKjY9dhu4jjDka3wU+zk/yyRWP+yda6SyLaquxnkBKg/NFjSTLyWW BXGiG5iHlVm8g804wkhhxNzAsqmVKoysGfEhLifAA0AVL7INaWE6eF0GLR9lRVf7Lf 5mDjn+XYso7HHFNYWrMmvay6ltsOa6me9jSbVhvIjCR1VdUZiLTM3k9tDlyxJ/6/vE t2nGKfmjgW5MkFl8ltiE0Ka5PH6cy1meV8dbBkaUyluYj4o0lZGhJcgN2w+9m7FTNp ql56JvJGoEhpA== X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 216.228.121.143 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Zhengxiao.zx@Alibaba-inc.com, kevin.tian@intel.com, yi.l.liu@intel.com, yan.y.zhao@intel.com, eskultet@redhat.com, ziye.yang@intel.com, qemu-devel@nongnu.org, cohuck@redhat.com, shuangtai.tst@alibaba-inc.com, dgilbert@redhat.com, zhi.a.wang@intel.com, mlevitsk@redhat.com, pasic@linux.ibm.com, aik@ozlabs.ru, Kirti Wankhede , eauger@redhat.com, felipe@nutanix.com, jonathan.davies@nutanix.com, changpeng.liu@intel.com, Ken.Xue@amd.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Added .save_live_pending, .save_live_iterate and .save_live_complete_precopy functions. These functions handles pre-copy and stop-and-copy phase. In _SAVING|_RUNNING device state or pre-copy phase: - read pending_bytes. If pending_bytes > 0, go through below steps. - read data_offset - indicates kernel driver to write data to staging buffer. - read data_size - amount of data in bytes written by vendor driver in migration region. - read data_size bytes of data from data_offset in the migration region. - Write data packet to file stream as below: {VFIO_MIG_FLAG_DEV_DATA_STATE, data_size, actual data, VFIO_MIG_FLAG_END_OF_STATE } In _SAVING device state or stop-and-copy phase a. read config space of device and save to migration file stream. This doesn't need to be from vendor driver. Any other special config state from driver can be saved as data in following iteration. b. read pending_bytes. If pending_bytes > 0, go through below steps. c. read data_offset - indicates kernel driver to write data to staging buffer. d. read data_size - amount of data in bytes written by vendor driver in migration region. e. read data_size bytes of data from data_offset in the migration region. f. Write data packet as below: {VFIO_MIG_FLAG_DEV_DATA_STATE, data_size, actual data} g. iterate through steps b to f while (pending_bytes > 0) h. Write {VFIO_MIG_FLAG_END_OF_STATE} When data region is mapped, its user's responsibility to read data from data_offset of data_size before moving to next steps. Signed-off-by: Kirti Wankhede Reviewed-by: Neo Jia --- hw/vfio/migration.c | 245 ++++++++++++++++++++++++++++++++++++++++++++++++++- hw/vfio/trace-events | 6 ++ 2 files changed, 250 insertions(+), 1 deletion(-) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 48aac6d29876..f890e864e174 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -120,6 +120,137 @@ static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t set_flags, return 0; } +static void *find_data_region(VFIORegion *region, + uint64_t data_offset, + uint64_t data_size) +{ + void *ptr = NULL; + int i; + + for (i = 0; i < region->nr_mmaps; i++) { + if ((data_offset >= region->mmaps[i].offset) && + (data_offset < region->mmaps[i].offset + region->mmaps[i].size) && + (data_size <= region->mmaps[i].size)) { + ptr = region->mmaps[i].mmap + (data_offset - + region->mmaps[i].offset); + break; + } + } + return ptr; +} + +static int vfio_save_buffer(QEMUFile *f, VFIODevice *vbasedev) +{ + VFIOMigration *migration = vbasedev->migration; + VFIORegion *region = &migration->region; + uint64_t data_offset = 0, data_size = 0; + int ret; + + ret = pread(vbasedev->fd, &data_offset, sizeof(data_offset), + region->fd_offset + offsetof(struct vfio_device_migration_info, + data_offset)); + if (ret != sizeof(data_offset)) { + error_report("%s: Failed to get migration buffer data offset %d", + vbasedev->name, ret); + return -EINVAL; + } + + ret = pread(vbasedev->fd, &data_size, sizeof(data_size), + region->fd_offset + offsetof(struct vfio_device_migration_info, + data_size)); + if (ret != sizeof(data_size)) { + error_report("%s: Failed to get migration buffer data size %d", + vbasedev->name, ret); + return -EINVAL; + } + + if (data_size > 0) { + void *buf = NULL; + bool buffer_mmaped; + + if (region->mmaps) { + buf = find_data_region(region, data_offset, data_size); + } + + buffer_mmaped = (buf != NULL) ? true : false; + + if (!buffer_mmaped) { + buf = g_try_malloc0(data_size); + if (!buf) { + error_report("%s: Error allocating buffer ", __func__); + return -ENOMEM; + } + + ret = pread(vbasedev->fd, buf, data_size, + region->fd_offset + data_offset); + if (ret != data_size) { + error_report("%s: Failed to get migration data %d", + vbasedev->name, ret); + g_free(buf); + return -EINVAL; + } + } + + qemu_put_be64(f, data_size); + qemu_put_buffer(f, buf, data_size); + + if (!buffer_mmaped) { + g_free(buf); + } + } else { + qemu_put_be64(f, data_size); + } + + trace_vfio_save_buffer(vbasedev->name, data_offset, data_size, + migration->pending_bytes); + + ret = qemu_file_get_error(f); + if (ret) { + return ret; + } + + return data_size; +} + +static int vfio_update_pending(VFIODevice *vbasedev) +{ + VFIOMigration *migration = vbasedev->migration; + VFIORegion *region = &migration->region; + uint64_t pending_bytes = 0; + int ret; + + ret = pread(vbasedev->fd, &pending_bytes, sizeof(pending_bytes), + region->fd_offset + offsetof(struct vfio_device_migration_info, + pending_bytes)); + if ((ret < 0) || (ret != sizeof(pending_bytes))) { + error_report("%s: Failed to get pending bytes %d", + vbasedev->name, ret); + migration->pending_bytes = 0; + return (ret < 0) ? ret : -EINVAL; + } + + migration->pending_bytes = pending_bytes; + trace_vfio_update_pending(vbasedev->name, pending_bytes); + return 0; +} + +static int vfio_save_device_config_state(QEMUFile *f, void *opaque) +{ + VFIODevice *vbasedev = opaque; + + qemu_put_be64(f, VFIO_MIG_FLAG_DEV_CONFIG_STATE); + + if (vbasedev->ops && vbasedev->ops->vfio_save_config) { + vbasedev->ops->vfio_save_config(vbasedev, f); + } + + qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE); + + trace_vfio_save_device_config_state(vbasedev->name); + + return qemu_file_get_error(f); +} + /* ---------------------------------------------------------------------- */ static int vfio_save_setup(QEMUFile *f, void *opaque) @@ -136,7 +267,7 @@ static int vfio_save_setup(QEMUFile *f, void *opaque) qemu_mutex_unlock_iothread(); if (ret) { error_report("%s: Failed to mmap VFIO migration region %d: %s", - vbasedev->name, migration->region.index, + vbasedev->name, migration->region.nr, strerror(-ret)); return ret; } @@ -170,9 +301,121 @@ static void vfio_save_cleanup(void *opaque) trace_vfio_save_cleanup(vbasedev->name); } +static void vfio_save_pending(QEMUFile *f, void *opaque, + uint64_t threshold_size, + uint64_t *res_precopy_only, + uint64_t *res_compatible, + uint64_t *res_postcopy_only) +{ + VFIODevice *vbasedev = opaque; + VFIOMigration *migration = vbasedev->migration; + int ret; + + ret = vfio_update_pending(vbasedev); + if (ret) { + return; + } + + *res_precopy_only += migration->pending_bytes; + + trace_vfio_save_pending(vbasedev->name, *res_precopy_only, + *res_postcopy_only, *res_compatible); +} + +static int vfio_save_iterate(QEMUFile *f, void *opaque) +{ + VFIODevice *vbasedev = opaque; + int ret, data_size; + + qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE); + + data_size = vfio_save_buffer(f, vbasedev); + + if (data_size < 0) { + error_report("%s: vfio_save_buffer failed %s", vbasedev->name, + strerror(errno)); + return data_size; + } + + qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE); + + ret = qemu_file_get_error(f); + if (ret) { + return ret; + } + + trace_vfio_save_iterate(vbasedev->name, data_size); + if (data_size == 0) { + /* indicates data finished, goto complete phase */ + return 1; + } + + return 0; +} + +static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) +{ + VFIODevice *vbasedev = opaque; + VFIOMigration *migration = vbasedev->migration; + int ret; + + ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_SAVING, + VFIO_DEVICE_STATE_RUNNING); + if (ret) { + error_report("%s: Failed to set state STOP and SAVING", + vbasedev->name); + return ret; + } + + ret = vfio_save_device_config_state(f, opaque); + if (ret) { + return ret; + } + + ret = vfio_update_pending(vbasedev); + if (ret) { + return ret; + } + + while (migration->pending_bytes > 0) { + qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE); + ret = vfio_save_buffer(f, vbasedev); + if (ret < 0) { + error_report("%s: Failed to save buffer", vbasedev->name); + return ret; + } else if (ret == 0) { + break; + } + + ret = vfio_update_pending(vbasedev); + if (ret) { + return ret; + } + } + + qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE); + + ret = qemu_file_get_error(f); + if (ret) { + return ret; + } + + ret = vfio_migration_set_state(vbasedev, 0, VFIO_DEVICE_STATE_SAVING); + if (ret) { + error_report("%s: Failed to set state STOPPED", vbasedev->name); + return ret; + } + + trace_vfio_save_complete_precopy(vbasedev->name); + return ret; +} + static SaveVMHandlers savevm_vfio_handlers = { .save_setup = vfio_save_setup, .save_cleanup = vfio_save_cleanup, + .save_live_pending = vfio_save_pending, + .save_live_iterate = vfio_save_iterate, + .save_live_complete_precopy = vfio_save_complete_precopy, }; /* ---------------------------------------------------------------------- */ diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events index 4bb43f18f315..bdf40ba368c7 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -151,3 +151,9 @@ vfio_vmstate_change(char *name, int running, const char *reason, uint32_t dev_st vfio_migration_state_notifier(char *name, int state) " (%s) state %d" vfio_save_setup(char *name) " (%s)" vfio_save_cleanup(char *name) " (%s)" +vfio_save_buffer(char *name, uint64_t data_offset, uint64_t data_size, uint64_t pending) " (%s) Offset 0x%"PRIx64" size 0x%"PRIx64" pending 0x%"PRIx64 +vfio_update_pending(char *name, uint64_t pending) " (%s) pending 0x%"PRIx64 +vfio_save_device_config_state(char *name) " (%s)" +vfio_save_pending(char *name, uint64_t precopy, uint64_t postcopy, uint64_t compatible) " (%s) precopy 0x%"PRIx64" postcopy 0x%"PRIx64" compatible 0x%"PRIx64 +vfio_save_iterate(char *name, int data_size) " (%s) data_size %d" +vfio_save_complete_precopy(char *name) " (%s)"