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Fri, 23 Oct 2020 11:14:39 +0000 Received: from kwankhede-dev.nvidia.com (172.20.13.39) by mail.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Fri, 23 Oct 2020 11:14:31 +0000 From: Kirti Wankhede To: , Subject: [PATCH v28 09/17] vfio: Add load state functions to SaveVMHandlers Date: Fri, 23 Oct 2020 16:10:35 +0530 Message-ID: <1603449643-12851-10-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1603449643-12851-1-git-send-email-kwankhede@nvidia.com> References: <1603449643-12851-1-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=1603451677; bh=8ysAm7jR2GvH1UasZy6D6A+KrT62Hj+LzdaCp6e3NeI=; h=From:To:CC:Subject:Date:Message-ID:X-Mailer:In-Reply-To: References:X-NVConfidentiality:MIME-Version:Content-Type; b=goQSfX4br2bqfmCIAryocKXGarfFr5f8+0o0pcV0roS84pjthZyqllVQaNBIccgWU RRPC7S4iba7Tfr9X/zC9TO12kFqdT8YKUWcGe9jWXNSq53YC8Q8ghiybXRwodQ4IRN FG7CHeeNlnXukAURgJ7L0X62Ki5uNjuuS93q6QalA/L1sGNPIqVStAmsUJV0/r4zj+ gW5WbRMCP1IZr1QFn58lLTWrsniRYTrRk06h5zUgAddCDcUEKkb8bhOhlRDdcwaZTd tTvN+FCJukcBe3yAw0JOJwCK/l3SRUPjdnNZqA97NkfAroEXKoW2f1o/At1eQl5uCg GT9SxSAhAwzqg== Received-SPF: pass client-ip=216.228.121.65; envelope-from=kwankhede@nvidia.com; helo=hqnvemgate26.nvidia.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/23 07:14:11 X-ACL-Warn: Detected OS = Windows 7 or 8 [fuzzy] X-Spam_score_int: -70 X-Spam_score: -7.1 X-Spam_bar: ------- X-Spam_report: (-7.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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 autolearn=ham autolearn_force=no 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, zhi.wang.linux@gmail.com, aik@ozlabs.ru, Zhengxiao.zx@Alibaba-inc.com, shuangtai.tst@alibaba-inc.com, qemu-devel@nongnu.org, peterx@redhat.com, Kirti Wankhede , eauger@redhat.com, artemp@nvidia.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, mcrossley@nvidia.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, dnigam@nvidia.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" 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 Reviewed-by: Yan Zhao --- hw/vfio/migration.c | 195 +++++++++++++++++++++++++++++++++++++++++++++++++++ hw/vfio/trace-events | 4 ++ 2 files changed, 199 insertions(+) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index be9e4aba541d..240646592b39 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -257,6 +257,77 @@ static int vfio_save_buffer(QEMUFile *f, VFIODevice *vbasedev, uint64_t *size) return ret; } +static int vfio_load_buffer(QEMUFile *f, VFIODevice *vbasedev, + uint64_t data_size) +{ + VFIORegion *region = &vbasedev->migration->region; + uint64_t data_offset = 0, size, report_size; + int ret; + + do { + ret = vfio_mig_read(vbasedev, &data_offset, sizeof(data_offset), + region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_offset)); + if (ret < 0) { + return ret; + } + + if (data_offset + data_size > region->size) { + /* + * If data_size is greater than the data section of migration region + * then iterate the write buffer operation. This case can occur if + * size of migration region at destination is smaller than size of + * migration region at source. + */ + report_size = size = region->size - data_offset; + data_size -= size; + } else { + report_size = size = data_size; + data_size = 0; + } + + trace_vfio_load_state_device_data(vbasedev->name, data_offset, size); + + while (size) { + void *buf; + uint64_t sec_size; + bool buf_alloc = false; + + buf = get_data_section_size(region, data_offset, size, &sec_size); + + if (!buf) { + buf = g_try_malloc(sec_size); + if (!buf) { + error_report("%s: Error allocating buffer ", __func__); + return -ENOMEM; + } + buf_alloc = true; + } + + qemu_get_buffer(f, buf, sec_size); + + if (buf_alloc) { + ret = vfio_mig_write(vbasedev, buf, sec_size, + region->fd_offset + data_offset); + g_free(buf); + + if (ret < 0) { + return ret; + } + } + size -= sec_size; + data_offset += sec_size; + } + + ret = vfio_mig_write(vbasedev, &report_size, sizeof(report_size), + region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_size)); + if (ret < 0) { + return ret; + } + } while (data_size); + + return 0; +} + static int vfio_update_pending(VFIODevice *vbasedev) { VFIOMigration *migration = vbasedev->migration; @@ -293,6 +364,33 @@ 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 void vfio_migration_cleanup(VFIODevice *vbasedev) { VFIOMigration *migration = vbasedev->migration; @@ -483,12 +581,109 @@ 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)); + error_report("%s: Falling back to slow path", vbasedev->name); + } + } + + 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); + if (migration->region.mmaps) { + vfio_region_unmap(&migration->region); + } + } + return ret; +} + +static int vfio_load_cleanup(void *opaque) +{ + VFIODevice *vbasedev = opaque; + + vfio_migration_cleanup(vbasedev); + trace_vfio_load_cleanup(vbasedev->name); + return 0; +} + +static int vfio_load_state(QEMUFile *f, void *opaque, int version_id) +{ + VFIODevice *vbasedev = opaque; + int ret = 0; + uint64_t data; + + 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: + { + uint64_t data_size = qemu_get_be64(f); + + if (data_size) { + ret = vfio_load_buffer(f, vbasedev, data_size); + if (ret < 0) { + return ret; + } + } + 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 9f5712dab1ea..a75b5208818c 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -159,3 +159,7 @@ 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 +vfio_load_cleanup(const char *name) " (%s)"