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...vb->cmd_stop, + sizeof(struct virtio_balloon_free_page_hints_cmd)); + return virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_stop, GFP_KERNEL); +} + +/* + * virtio_balloon_send_hints - send arrays of hints to host + * @vb: the virtio_balloon struct + * @arrays: the arrays of hints + * @array_num: the number of arrays give by the caller + * @last_array_hints: the number of hints in the last array + * + * Send hints to host array by array. This begins by sending a start cmd, + * which contains a cmd id received from host and the free page block size in + * bytes of each hint. At the end, a s...

...rtio_balloon_free_page_hints_cmd)); > + return virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_stop, GFP_KERNEL); > +} > + > +/* > + * virtio_balloon_send_hints - send arrays of hints to host > + * @vb: the virtio_balloon struct > + * @arrays: the arrays of hints > + * @array_num: the number of arrays give by the caller > + * @last_array_hints: the number of hints in the last array > + * > + * Send hints to host array by array. This begins by sending a start cmd, > + * which contains a cmd id received from host and the free page block size in > + * bytes of e...

...rtio_balloon_free_page_hints_cmd)); > + return virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_stop, GFP_KERNEL); > +} > + > +/* > + * virtio_balloon_send_hints - send arrays of hints to host > + * @vb: the virtio_balloon struct > + * @arrays: the arrays of hints > + * @array_num: the number of arrays give by the caller > + * @last_array_hints: the number of hints in the last array > + * > + * Send hints to host array by array. This begins by sending a start cmd, > + * which contains a cmd id received from host and the free page block size in > + * bytes of e...

This patch series is separated from the previous "Virtio-balloon Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this series enables the virtio-balloon driver to report hints of guest free pages to the host. It can be used to accelerate live migration of VMs. Here is an introduction of this usage: Live migration needs to transfer the VM's

This patch series is separated from the previous "Virtio-balloon Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this series enables the virtio-balloon driver to report hints of guest free pages to the host. It can be used to accelerate live migration of VMs. Here is an introduction of this usage: Live migration needs to transfer the VM's

...versions (e.g. v32). It is changed because we agreed that using BUG() isn't necessary here, and better to bail out nicely. > > +/* > + * virtio_balloon_send_hints - send arrays of hints to host > + * @vb: the virtio_balloon struct > + * @arrays: the arrays of hints > + * @array_num: the number of arrays give by the caller > + * @last_array_hints: the number of hints in the last array > + * > + * Send hints to host array by array. This begins by sending a start cmd, > + * which contains a cmd id received from host and the free page block size in > + * bytes of e...

...ely. Why is this part of the hinting patch though? I'd rather have a separate one. > > > > > > +/* > > + * virtio_balloon_send_hints - send arrays of hints to host > > + * @vb: the virtio_balloon struct > > + * @arrays: the arrays of hints > > + * @array_num: the number of arrays give by the caller > > + * @last_array_hints: the number of hints in the last array > > + * > > + * Send hints to host array by array. This begins by sending a start cmd, > > + * which contains a cmd id received from host and the free page block size in...

...ely. Why is this part of the hinting patch though? I'd rather have a separate one. > > > > > > +/* > > + * virtio_balloon_send_hints - send arrays of hints to host > > + * @vb: the virtio_balloon struct > > + * @arrays: the arrays of hints > > + * @array_num: the number of arrays give by the caller > > + * @last_array_hints: the number of hints in the last array > > + * > > + * Send hints to host array by array. This begins by sending a start cmd, > > + * which contains a cmd id received from host and the free page block size in...