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Mon, 08 Jul 2019 12:21:15 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Mon, 08 Jul 2019 12:21:15 -0700 Received: from HQMAIL108.nvidia.com (172.18.146.13) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 8 Jul 2019 19:21:15 +0000 Received: from kwankhede-dev.nvidia.com (10.124.1.5) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Mon, 8 Jul 2019 19:21:08 +0000 From: Kirti Wankhede To: , Date: Tue, 9 Jul 2019 00:47:29 +0530 Message-ID: <1562613452-24969-11-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1562613452-24969-1-git-send-email-kwankhede@nvidia.com> References: <1562613452-24969-1-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=1562613674; bh=yBjqmN+GS5fGXlxqrXJTMWeR6Y126MP5vM4ePZTJeIc=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=esqB5lAUakhj/SnX5Kjb69pQrWiTI8e2+uis5FJPYkekcJLhZWXebg9JTOMPrSR1L 1fkqWpqzRbcOr1aUGS/I1bt8TMY+4e87Wb3kPu8FmQhK3rgddd5GHVzfZAbtlkImb9 iTciirSxcDV0jCg/5h2mKDHacEukBy/uwFXxgq8pcamqjY5Sq3tZbQRD4peLDPCcpP eh6qx8hULKaCVxvlrm04IpQw+x+3nbKh/dF+ZTu+RgSJgU3o0U+iIPNDLhuaQmjHqB KytcDfc6KnyjJR8ebQwpSRnjea/qX1sXrdB315nVuRX0T5WgSKGYbe7FvJYHWyWS2p XfuhVEWqmkf/w== X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 X-Received-From: 216.228.121.65 Subject: [Qemu-devel] [PATCH v5 10/13] vfio: Add load state functions to SaveVMHandlers 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Flow during _RESUMING device state: - If Vendor driver defines mappable region, mmap migration region. - Load config state. - For data packet, till VFIO_MIG_FLAG_END_OF_STATE is not reached - read data_size from packet, read buffer of data_size - read data_offset from where QEMU should write data. if region is mmaped, write data of data_size to mmaped region. - write data_size. In case of mmapped region, write to data_size indicates kernel driver that data is written in staging buffer. - if region is trapped, pwrite() data of data_size from data_offset. - Repeat above until VFIO_MIG_FLAG_END_OF_STATE. - Unmap migration region. For user, data is opaque. User should write data in the same order as received. Signed-off-by: Kirti Wankhede Reviewed-by: Neo Jia --- hw/vfio/migration.c | 162 +++++++++++++++++++++++++++++++++++++++++++++++++++ hw/vfio/trace-events | 4 ++ 2 files changed, 166 insertions(+) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 4e9b4cce230b..5fb4c5329ede 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -249,6 +249,26 @@ static int vfio_save_device_config_state(QEMUFile *f, void *opaque) return qemu_file_get_error(f); } +static int vfio_load_device_config_state(QEMUFile *f, void *opaque) +{ + VFIODevice *vbasedev = opaque; + uint64_t data; + + if (vbasedev->ops && vbasedev->ops->vfio_load_config) { + vbasedev->ops->vfio_load_config(vbasedev, f); + } + + data = qemu_get_be64(f); + if (data != VFIO_MIG_FLAG_END_OF_STATE) { + error_report("%s: Failed loading device config space, " + "end flag incorrect 0x%"PRIx64, vbasedev->name, data); + return -EINVAL; + } + + trace_vfio_load_device_config_state(vbasedev->name); + return qemu_file_get_error(f); +} + /* ---------------------------------------------------------------------- */ static int vfio_save_setup(QEMUFile *f, void *opaque) @@ -421,12 +441,154 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) return ret; } +static int vfio_load_setup(QEMUFile *f, void *opaque) +{ + VFIODevice *vbasedev = opaque; + VFIOMigration *migration = vbasedev->migration; + int ret = 0; + + if (migration->region.buffer.mmaps) { + ret = vfio_region_mmap(&migration->region.buffer); + if (ret) { + error_report("%s: Failed to mmap VFIO migration region %d: %s", + vbasedev->name, migration->region.index, + strerror(-ret)); + return ret; + } + } + + ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING); + if (ret) { + error_report("%s: Failed to set state RESUMING", vbasedev->name); + } + return ret; +} + +static int vfio_load_cleanup(void *opaque) +{ + vfio_save_cleanup(opaque); + return 0; +} + +static int vfio_load_state(QEMUFile *f, void *opaque, int version_id) +{ + VFIODevice *vbasedev = opaque; + VFIOMigration *migration = vbasedev->migration; + int ret = 0; + uint64_t data, data_size; + + data = qemu_get_be64(f); + while (data != VFIO_MIG_FLAG_END_OF_STATE) { + + trace_vfio_load_state(vbasedev->name, data); + + switch (data) { + case VFIO_MIG_FLAG_DEV_CONFIG_STATE: + { + ret = vfio_load_device_config_state(f, opaque); + if (ret) { + return ret; + } + break; + } + case VFIO_MIG_FLAG_DEV_SETUP_STATE: + { + data = qemu_get_be64(f); + if (data == VFIO_MIG_FLAG_END_OF_STATE) { + return ret; + } else { + error_report("%s: SETUP STATE: EOS not found 0x%"PRIx64, + vbasedev->name, data); + return -EINVAL; + } + break; + } + case VFIO_MIG_FLAG_DEV_DATA_STATE: + { + VFIORegion *region = &migration->region.buffer; + void *buf = NULL; + bool buffer_mmaped = false; + uint64_t data_offset = 0; + + data_size = qemu_get_be64(f); + if (data_size == 0) { + break; + } + + 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; + } + + 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; + } + } + + qemu_get_buffer(f, buf, data_size); + + ret = pwrite(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 set migration buffer data size %d", + vbasedev->name, ret); + if (!buffer_mmaped) { + g_free(buf); + } + return -EINVAL; + } + + if (!buffer_mmaped) { + ret = pwrite(vbasedev->fd, buf, data_size, + region->fd_offset + data_offset); + g_free(buf); + + if (ret != data_size) { + error_report("%s: Failed to set migration buffer %d", + vbasedev->name, ret); + return -EINVAL; + } + } + trace_vfio_load_state_device_data(vbasedev->name, data_offset, + data_size); + break; + } + } + + ret = qemu_file_get_error(f); + if (ret) { + return ret; + } + data = qemu_get_be64(f); + } + + 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, + .load_setup = vfio_load_setup, + .load_cleanup = vfio_load_cleanup, + .load_state = vfio_load_state, }; /* ---------------------------------------------------------------------- */ diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events index 4c16e787f5a1..e01c94e6ebd4 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -157,3 +157,7 @@ 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%x"PRIx64" compatible 0x%""PRIx64 vfio_save_iterate(char *name, int data_size) " (%s) data_size %d" vfio_save_complete_precopy(char *name) " (%s)" +vfio_load_device_config_state(char *name) " (%s)" +vfio_load_state(char *name, uint64_t data) " (%s) data 0x%"PRIx64 +vfio_load_state_device_data(char *name, uint64_t data_offset, uint64_t data_size) " (%s), Offset 0x%"PRIx64" size 0x%"PRIx64 +