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Thu, 25 Jun 2020 07:15:57 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Thu, 25 Jun 2020 07:16:44 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Thu, 25 Jun 2020 07:16:44 -0700 Received: from [10.40.100.228] (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Thu, 25 Jun 2020 14:16:26 +0000 Subject: Re: [PATCH QEMU v25 09/17] vfio: Add load state functions to SaveVMHandlers To: Alex Williamson References: <1592684486-18511-1-git-send-email-kwankhede@nvidia.com> <1592684486-18511-10-git-send-email-kwankhede@nvidia.com> <20200624125437.664869ce@x1.home> X-Nvconfidentiality: public From: Kirti Wankhede Message-ID: <1cb6dc9d-53b6-b978-9cb8-b4d7daaca400@nvidia.com> Date: Thu, 25 Jun 2020 19:46:22 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.8.1 MIME-Version: 1.0 In-Reply-To: <20200624125437.664869ce@x1.home> X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL101.nvidia.com (172.20.187.10) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1593094557; bh=vIPWIrTFvhOQVRomYCKQqHeEoH31aGbyzWhK9LxCb2o=; h=X-PGP-Universal:Subject:To:CC:References:X-Nvconfidentiality:From: Message-ID:Date:User-Agent:MIME-Version:In-Reply-To: X-Originating-IP:X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=lbRFodoKhcVoDHkUg+Nd4kciHkFDs09wbAbKOPSds5NDz9iusEezjRJ02DFpAwBwM 1uwWUTnS3Zkfg+XAJRmC63wxiLXbphS06QLwo3tyyh/UHUrsCoiinZlNUEZaHdrJLw B0NAwhOu66jz3ZHarQmmVxU0/iuMbgUkQN8NXgt+3NezOLiInHsEaGLqSWCQEb9jW3 em9K1L/6ZyETm177xsm4Fe0ddd+ziQtAnIeem27VlsEh1ItSIuCt5NwvY6qFmKKVC8 Gu90/A5Qxc6HCFaz030aRAdY+MtcEONBfdtbCEnH+Ss8Jk2iRyidyBw5lvN8U54VEX 9VkExuD+yWByA== Received-SPF: pass client-ip=216.228.121.64; envelope-from=kwankhede@nvidia.com; helo=hqnvemgate25.nvidia.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/25 10:09:41 X-ACL-Warn: Detected OS = Windows 7 or 8 [fuzzy] X-Spam_score_int: -80 X-Spam_score: -8.1 X-Spam_bar: -------- X-Spam_report: (-8.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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: cohuck@redhat.com, cjia@nvidia.com, aik@ozlabs.ru, Zhengxiao.zx@Alibaba-inc.com, shuangtai.tst@alibaba-inc.com, qemu-devel@nongnu.org, peterx@redhat.com, eauger@redhat.com, yi.l.liu@intel.com, quintela@redhat.com, ziye.yang@intel.com, armbru@redhat.com, mlevitsk@redhat.com, pasic@linux.ibm.com, felipe@nutanix.com, zhi.a.wang@intel.com, kevin.tian@intel.com, yan.y.zhao@intel.com, dgilbert@redhat.com, changpeng.liu@intel.com, eskultet@redhat.com, Ken.Xue@amd.com, jonathan.davies@nutanix.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 6/25/2020 12:24 AM, Alex Williamson wrote: > On Sun, 21 Jun 2020 01:51:18 +0530 > Kirti Wankhede wrote: > >> Sequence during _RESUMING device state: >> While data for this device is available, repeat below steps: >> a. read data_offset from where user application should write data. >> b. write data of data_size to migration region from data_offset. >> c. write data_size which indicates vendor driver that data is written in >> staging buffer. >> >> For user, data is opaque. User should write data in the same order as >> received. >> >> Signed-off-by: Kirti Wankhede >> Reviewed-by: Neo Jia >> Reviewed-by: Dr. David Alan Gilbert >> --- >> hw/vfio/migration.c | 177 +++++++++++++++++++++++++++++++++++++++++++++++++++ >> hw/vfio/trace-events | 3 + >> 2 files changed, 180 insertions(+) >> >> diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c >> index ef1150c1ff02..faacea5327cb 100644 >> --- a/hw/vfio/migration.c >> +++ b/hw/vfio/migration.c >> @@ -302,6 +302,33 @@ 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) { >> + int ret; >> + >> + ret = vbasedev->ops->vfio_load_config(vbasedev, f); >> + if (ret) { >> + error_report("%s: Failed to load device config space", >> + vbasedev->name); >> + return ret; >> + } >> + } >> + >> + 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) >> @@ -472,12 +499,162 @@ 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.mmaps) { >> + ret = vfio_region_mmap(&migration->region); >> + if (ret) { >> + error_report("%s: Failed to mmap VFIO migration region %d: %s", >> + vbasedev->name, migration->region.nr, >> + strerror(-ret)); >> + return ret; > > > Not fatal. > As discussed on 07/17 patch of this series, it should fall back to read/write, right? > >> + } >> + } >> + >> + ret = vfio_migration_set_state(vbasedev, ~VFIO_DEVICE_STATE_MASK, >> + 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; > > This is essentially just a compatibility failure, right? For instance > some future version of QEMU might include additional data between these > markers that we don't understand and therefore we fail the migration. > Yes. Thanks, Kirti Thanks, > > Alex > >> + } >> + break; >> + } >> + case VFIO_MIG_FLAG_DEV_DATA_STATE: >> + { >> + VFIORegion *region = &migration->region; >> + uint64_t data_offset = 0, size; >> + >> + data_size = 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; >> + } >> + >> + trace_vfio_load_state_device_data(vbasedev->name, data_offset, >> + data_size); >> + >> + while (size) { >> + void *buf = NULL; >> + uint64_t sec_size; >> + bool buffer_mmaped; >> + >> + buf = get_data_section_size(region, data_offset, size, >> + &sec_size); >> + >> + buffer_mmaped = (buf != NULL); >> + >> + if (!buffer_mmaped) { >> + buf = g_try_malloc(sec_size); >> + if (!buf) { >> + error_report("%s: Error allocating buffer ", __func__); >> + return -ENOMEM; >> + } >> + } >> + >> + qemu_get_buffer(f, buf, sec_size); >> + >> + if (!buffer_mmaped) { >> + ret = pwrite(vbasedev->fd, buf, sec_size, >> + region->fd_offset + data_offset); >> + g_free(buf); >> + >> + if (ret != sec_size) { >> + error_report("%s: Failed to set migration buffer %d", >> + vbasedev->name, ret); >> + return -EINVAL; >> + } >> + } >> + size -= sec_size; >> + data_offset += sec_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); >> + return -EINVAL; >> + } >> + break; >> + } >> + >> + default: >> + error_report("%s: Unknown tag 0x%"PRIx64, vbasedev->name, data); >> + return -EINVAL; >> + } >> + >> + data = qemu_get_be64(f); >> + ret = qemu_file_get_error(f); >> + if (ret) { >> + return ret; >> + } >> + } >> + >> + 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 9a1c5e17d97f..4a4bd3ba9a2a 100644 >> --- a/hw/vfio/trace-events >> +++ b/hw/vfio/trace-events >> @@ -157,3 +157,6 @@ vfio_save_device_config_state(const char *name) " (%s)" >> vfio_save_pending(const char *name, uint64_t precopy, uint64_t postcopy, uint64_t compatible) " (%s) precopy 0x%"PRIx64" postcopy 0x%"PRIx64" compatible 0x%"PRIx64 >> vfio_save_iterate(const char *name, int data_size) " (%s) data_size %d" >> vfio_save_complete_precopy(const char *name) " (%s)" >> +vfio_load_device_config_state(const char *name) " (%s)" >> +vfio_load_state(const char *name, uint64_t data) " (%s) data 0x%"PRIx64 >> +vfio_load_state_device_data(const char *name, uint64_t data_offset, uint64_t data_size) " (%s) Offset 0x%"PRIx64" size 0x%"PRIx64 >