search for: desc_table

...flated pages. */ #define VIRTIO_BALLOON_PAGE_BMAP_SIZE (8 * PAGE_SIZE) /* @@ -81,12 +85,25 @@ struct virtio_balloon_page_chunk { unsigned long *page_bmap[VIRTIO_BALLOON_PAGE_BMAP_MAX_NUM]; }; +struct virtio_balloon_cmdq_unused_page { + struct virtio_balloon_cmdq_hdr hdr; + struct vring_desc *desc_table; + /* Number of added descriptors */ + unsigned int num; +}; + +struct virtio_balloon_cmdq_stats { + struct virtio_balloon_cmdq_hdr hdr; + struct virtio_balloon_stat stats[VIRTIO_BALLOON_S_NR]; +}; + struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq,...

This patch series enhances the existing virtio-balloon with the following new features: 1) fast ballooning: transfer ballooned pages between the guest and host in chunks, instead of one by one; and 2) cmdq: a new virtqueue to send commands between the device and driver. Currently, it supports commands to report memory stats (replace the old statq mechanism) and report guest unused pages. Liang Li

This patch series enhances the existing virtio-balloon with the following new features: 1) fast ballooning: transfer ballooned pages between the guest and host in chunks, instead of one by one; and 2) cmdq: a new virtqueue to send commands between the device and driver. Currently, it supports commands to report memory stats (replace the old statq mechanism) and report guest unused pages. Liang Li

...size less than + * VIRTQUEUE_MAX_SIZE, so minus 1 here. + */ +#define VIRTIO_BALLOON_MAX_PAGE_CHUNKS (VIRTQUEUE_MAX_SIZE - 1) + +/* The struct to manage ballooned pages in chunks */ +struct virtio_balloon_page_chunk { + /* Indirect desc table to hold chunks of balloon pages */ + struct vring_desc *desc_table; + /* Number of added chunks of balloon pages */ + unsigned int chunk_num; + /* Bitmap used to record ballooned pages. */ + unsigned long *page_bmap[VIRTIO_BALLOON_PAGE_BMAP_MAX_NUM]; +}; + struct virtio_balloon { struct virtio_device *vdev; struct virtqueue *inflate_vq, *deflate_vq, *stats_vq...

...you want to support huge VQ sizes, you can add a fallback to smaller sizes until it fits in 1 page. > + > +/* The struct to manage ballooned pages in chunks */ > +struct virtio_balloon_page_chunk { > + /* Indirect desc table to hold chunks of balloon pages */ > + struct vring_desc *desc_table; > + /* Number of added chunks of balloon pages */ > + unsigned int chunk_num; > + /* Bitmap used to record ballooned pages. */ > + unsigned long *page_bmap[VIRTIO_BALLOON_PAGE_BMAP_MAX_NUM]; > +}; > + > struct virtio_balloon { > struct virtio_device *vdev; > struct...

...you want to support huge VQ sizes, you can add a fallback to smaller sizes until it fits in 1 page. > + > +/* The struct to manage ballooned pages in chunks */ > +struct virtio_balloon_page_chunk { > + /* Indirect desc table to hold chunks of balloon pages */ > + struct vring_desc *desc_table; > + /* Number of added chunks of balloon pages */ > + unsigned int chunk_num; > + /* Bitmap used to record ballooned pages. */ > + unsigned long *page_bmap[VIRTIO_BALLOON_PAGE_BMAP_MAX_NUM]; > +}; > + > struct virtio_balloon { > struct virtio_device *vdev; > struct...

...+ > +/* Add a chunk to the buffer. */ > +static void add_one_chunk(struct virtio_balloon *vb, struct virtqueue *vq, > + u64 base_addr, u32 size) > +{ > + unsigned int *num = &vb->balloon_page_chunk.chunk_num; > + struct vring_desc *desc = &vb->balloon_page_chunk.desc_table[*num]; > + > + desc->addr = cpu_to_virtio64(vb->vdev, base_addr); > + desc->len = cpu_to_virtio32(vb->vdev, size); > + *num += 1; > + if (*num == VIRTIO_BALLOON_MAX_PAGE_CHUNKS) > + send_page_chunks(vb, vq); > +} > + > Poking at virtio internals like this is...