From 0c9a38fee8b210a8dfd3f177526daac567ec9265 Mon Sep 17 00:00:00 2001 From: Yishai Hadas Date: Tue, 6 Dec 2022 10:34:33 +0200 Subject: [PATCH] vfio/mlx5: Introduce SW headers for migration states As mentioned in the previous patches, mlx5 is transferring multiple states when the PRE_COPY protocol is used. This states mechanism requires the target VM to know the states' size in order to execute multiple loads. Therefore, add SW header, with the needed information, for each saved state the source VM is transferring to the target VM. This patch implements the source VM handling of the headers, following patch will implement the target VM handling of the headers. Reviewed-by: Jason Gunthorpe Signed-off-by: Yishai Hadas Link: https://lore.kernel.org/r/20221206083438.37807-10-yishaih@nvidia.com Signed-off-by: Alex Williamson --- drivers/vfio/pci/mlx5/cmd.c | 56 +++++++++++++++++++++++++++++++++++++++++--- drivers/vfio/pci/mlx5/cmd.h | 13 ++++++++++ drivers/vfio/pci/mlx5/main.c | 2 +- 3 files changed, 67 insertions(+), 4 deletions(-) diff --git a/drivers/vfio/pci/mlx5/cmd.c b/drivers/vfio/pci/mlx5/cmd.c index 5fcece2..160fa38 100644 --- a/drivers/vfio/pci/mlx5/cmd.c +++ b/drivers/vfio/pci/mlx5/cmd.c @@ -351,9 +351,11 @@ mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf, if (ret) goto end; - ret = mlx5vf_dma_data_buffer(buf); - if (ret) - goto end; + if (dma_dir != DMA_NONE) { + ret = mlx5vf_dma_data_buffer(buf); + if (ret) + goto end; + } } return buf; @@ -422,6 +424,8 @@ void mlx5vf_mig_file_cleanup_cb(struct work_struct *_work) mutex_lock(&migf->lock); if (async_data->status) { mlx5vf_put_data_buffer(async_data->buf); + if (async_data->header_buf) + mlx5vf_put_data_buffer(async_data->header_buf); migf->state = MLX5_MIGF_STATE_ERROR; wake_up_interruptible(&migf->poll_wait); } @@ -431,6 +435,32 @@ void mlx5vf_mig_file_cleanup_cb(struct work_struct *_work) fput(migf->filp); } +static int add_buf_header(struct mlx5_vhca_data_buffer *header_buf, + size_t image_size) +{ + struct mlx5_vf_migration_file *migf = header_buf->migf; + struct mlx5_vf_migration_header header = {}; + unsigned long flags; + struct page *page; + u8 *to_buff; + + header.image_size = cpu_to_le64(image_size); + page = mlx5vf_get_migration_page(header_buf, 0); + if (!page) + return -EINVAL; + to_buff = kmap_local_page(page); + memcpy(to_buff, &header, sizeof(header)); + kunmap_local(to_buff); + header_buf->length = sizeof(header); + header_buf->header_image_size = image_size; + header_buf->start_pos = header_buf->migf->max_pos; + migf->max_pos += header_buf->length; + spin_lock_irqsave(&migf->list_lock, flags); + list_add_tail(&header_buf->buf_elm, &migf->buf_list); + spin_unlock_irqrestore(&migf->list_lock, flags); + return 0; +} + static void mlx5vf_save_callback(int status, struct mlx5_async_work *context) { struct mlx5vf_async_data *async_data = container_of(context, @@ -444,6 +474,11 @@ static void mlx5vf_save_callback(int status, struct mlx5_async_work *context) image_size = MLX5_GET(save_vhca_state_out, async_data->out, actual_image_size); + if (async_data->header_buf) { + status = add_buf_header(async_data->header_buf, image_size); + if (status) + goto err; + } async_data->buf->length = image_size; async_data->buf->start_pos = migf->max_pos; migf->max_pos += async_data->buf->length; @@ -455,6 +490,7 @@ static void mlx5vf_save_callback(int status, struct mlx5_async_work *context) wake_up_interruptible(&migf->poll_wait); } +err: /* * The error and the cleanup flows can't run from an * interrupt context @@ -470,6 +506,7 @@ int mlx5vf_cmd_save_vhca_state(struct mlx5vf_pci_core_device *mvdev, { u32 out_size = MLX5_ST_SZ_BYTES(save_vhca_state_out); u32 in[MLX5_ST_SZ_DW(save_vhca_state_in)] = {}; + struct mlx5_vhca_data_buffer *header_buf = NULL; struct mlx5vf_async_data *async_data; int err; @@ -499,6 +536,16 @@ int mlx5vf_cmd_save_vhca_state(struct mlx5vf_pci_core_device *mvdev, goto err_out; } + if (MLX5VF_PRE_COPY_SUPP(mvdev)) { + header_buf = mlx5vf_get_data_buffer(migf, + sizeof(struct mlx5_vf_migration_header), DMA_NONE); + if (IS_ERR(header_buf)) { + err = PTR_ERR(header_buf); + goto err_free; + } + } + + async_data->header_buf = header_buf; get_file(migf->filp); err = mlx5_cmd_exec_cb(&migf->async_ctx, in, sizeof(in), async_data->out, @@ -510,7 +557,10 @@ int mlx5vf_cmd_save_vhca_state(struct mlx5vf_pci_core_device *mvdev, return 0; err_exec: + if (header_buf) + mlx5vf_put_data_buffer(header_buf); fput(migf->filp); +err_free: kvfree(async_data->out); err_out: complete(&migf->save_comp); diff --git a/drivers/vfio/pci/mlx5/cmd.h b/drivers/vfio/pci/mlx5/cmd.h index 34e61c7..3e36ccc 100644 --- a/drivers/vfio/pci/mlx5/cmd.h +++ b/drivers/vfio/pci/mlx5/cmd.h @@ -12,16 +12,26 @@ #include #include +#define MLX5VF_PRE_COPY_SUPP(mvdev) \ + ((mvdev)->core_device.vdev.migration_flags & VFIO_MIGRATION_PRE_COPY) + enum mlx5_vf_migf_state { MLX5_MIGF_STATE_ERROR = 1, MLX5_MIGF_STATE_COMPLETE, }; +struct mlx5_vf_migration_header { + __le64 image_size; + /* For future use in case we may need to change the kernel protocol */ + __le64 flags; +}; + struct mlx5_vhca_data_buffer { struct sg_append_table table; loff_t start_pos; u64 length; u64 allocated_length; + u64 header_image_size; u32 mkey; enum dma_data_direction dma_dir; u8 dmaed:1; @@ -37,6 +47,7 @@ struct mlx5vf_async_data { struct mlx5_async_work cb_work; struct work_struct work; struct mlx5_vhca_data_buffer *buf; + struct mlx5_vhca_data_buffer *header_buf; int status; u8 last_chunk:1; void *out; @@ -165,6 +176,8 @@ mlx5vf_get_data_buffer(struct mlx5_vf_migration_file *migf, void mlx5vf_put_data_buffer(struct mlx5_vhca_data_buffer *buf); int mlx5vf_add_migration_pages(struct mlx5_vhca_data_buffer *buf, unsigned int npages); +struct page *mlx5vf_get_migration_page(struct mlx5_vhca_data_buffer *buf, + unsigned long offset); void mlx5vf_state_mutex_unlock(struct mlx5vf_pci_core_device *mvdev); void mlx5vf_disable_fds(struct mlx5vf_pci_core_device *mvdev); void mlx5vf_mig_file_cleanup_cb(struct work_struct *_work); diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c index 9cabba4..9a36e36 100644 --- a/drivers/vfio/pci/mlx5/main.c +++ b/drivers/vfio/pci/mlx5/main.c @@ -32,7 +32,7 @@ static struct mlx5vf_pci_core_device *mlx5vf_drvdata(struct pci_dev *pdev) core_device); } -static struct page * +struct page * mlx5vf_get_migration_page(struct mlx5_vhca_data_buffer *buf, unsigned long offset) { -- 2.7.4