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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,218 @@ | ||
| "use strict"; | ||
|
|
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| // https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html#x1-2900003 | ||
|
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| const VIRTIO_BALLOON_F_MUST_TELL_HOST = 0; | ||
| const VIRTIO_BALLOON_F_STATS_VQ = 1; | ||
| const VIRTIO_BALLOON_F_DEFLATE_ON_OOM = 2; | ||
| const VIRTIO_BALLOON_F_FREE_PAGE_HINT = 3; | ||
|
|
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| const STAT_NAMES = [ | ||
| "SWAP_IN", | ||
| "SWAP_OUT", | ||
| "MAJFLT", | ||
| "MINFLT", | ||
| "MEMFREE", | ||
| "MEMTOT", | ||
| "AVAIL", | ||
| "CACHES", | ||
| "HTLB_PGALLOC", | ||
| "HTLB_PGFAIL", | ||
| ]; | ||
|
|
||
| /** | ||
| * @constructor | ||
| * @param {CPU} cpu | ||
| * @param {BusConnector} bus | ||
| */ | ||
| function VirtioBalloon(cpu, bus) | ||
| { | ||
| /** @const @type {BusConnector} */ | ||
| this.bus = bus; | ||
| this.num_pages = 0; | ||
| this.actual = 0; | ||
| this.fp_cmd = 0; | ||
| this.zeroed = 0; | ||
|
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| const queues = [ | ||
| {size_supported: 32, notify_offset: 0}, | ||
| {size_supported: 32, notify_offset: 0}, | ||
| {size_supported: 2, notify_offset: 1}, | ||
| {size_supported: 64, notify_offset: 2}, | ||
| ]; | ||
|
|
||
| //setInterval(() => this.GetStats(console.log.bind(console, "STATS")), 10000); | ||
|
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| /** @type {VirtIO} */ | ||
| this.virtio = new VirtIO(cpu, | ||
| { | ||
| name: "virtio-balloon", | ||
| pci_id: 0x0B << 3, | ||
| device_id: 0x1045, | ||
| subsystem_device_id: 5, | ||
| common: | ||
| { | ||
| initial_port: 0xD800, | ||
| queues: queues, | ||
| features: | ||
| [ | ||
| VIRTIO_BALLOON_F_STATS_VQ, | ||
| VIRTIO_BALLOON_F_FREE_PAGE_HINT, | ||
| VIRTIO_F_VERSION_1, | ||
| ], | ||
| on_driver_ok: () => { | ||
| dbg_log("Balloon setup", LOG_PCI); | ||
| }, | ||
| }, | ||
| notification: | ||
| { | ||
| initial_port: 0xD900, | ||
| single_handler: false, | ||
| handlers: | ||
| [ | ||
| (queue_id) => | ||
| { | ||
| const queue = this.virtio.queues[queue_id]; | ||
| while(queue.has_request()) | ||
| { | ||
| const bufchain = queue.pop_request(); | ||
| const buffer = new Uint8Array(bufchain.length_readable); | ||
| bufchain.get_next_blob(buffer); | ||
| this.virtio.queues[queue_id].push_reply(bufchain); | ||
| let n = buffer.byteLength / 4; | ||
| this.actual += (queue_id === 0 ? n : -n); | ||
| //console.log(queue_id === 0 ? "Inflate" : "Deflate", this.num_pages, this.actual, bufchain.read_buffers); | ||
| } | ||
| this.virtio.queues[queue_id].flush_replies(); | ||
| }, | ||
| (queue_id) => | ||
| { | ||
| const queue = this.virtio.queues[queue_id]; | ||
| if(queue.has_request()) | ||
| { | ||
| const bufchain = queue.pop_request(); | ||
| const buffer = new Uint8Array(bufchain.length_readable); | ||
| bufchain.get_next_blob(buffer); | ||
| let result = {}; | ||
| for(let i = 0; i < bufchain.length_readable; i += 10) { | ||
| let [cat, value] = marshall.Unmarshall(["h", "d"], buffer, { offset : i }); | ||
| result[STAT_NAMES[cat]] = value; | ||
| } | ||
| this.virtio.queues[queue_id].push_reply(bufchain); | ||
| if(this.stats_cb) this.stats_cb(result); | ||
| } | ||
| }, | ||
| (queue_id) => | ||
| { | ||
| const queue = this.virtio.queues[queue_id]; | ||
| while(queue.has_request()) | ||
| { | ||
| const bufchain = queue.pop_request(); | ||
| if(bufchain.length_readable > 0) { | ||
| const buffer = new Uint8Array(bufchain.length_readable); | ||
| bufchain.get_next_blob(buffer); | ||
| let [cmd] = marshall.Unmarshall(["w"], buffer, { offset : 0 }); | ||
| if(cmd === 0) { | ||
| if(this.free_cb) this.free_cb(this.zeroed); | ||
| if(this.fp_cmd > 1) this.fp_cmd = 1; // Signal done | ||
| this.virtio.notify_config_changes(); | ||
| } | ||
| } | ||
| if(bufchain.length_writable > 0) { | ||
| // console.log("Free pages hinted", bufchain.read_buffers, bufchain.write_buffers); | ||
| let zeros = new Uint8Array(0); | ||
| for(let i = 0; i < bufchain.write_buffers.length; ++i) { | ||
| let b = bufchain.write_buffers[i]; | ||
| this.zeroed += b.len; | ||
| this.virtio.cpu.zero_memory(b.addr_low, b.len); | ||
| } | ||
| } | ||
| this.virtio.queues[queue_id].push_reply(bufchain); | ||
| } | ||
| this.virtio.queues[queue_id].flush_replies(); | ||
| }, | ||
| ], | ||
| }, | ||
| isr_status: | ||
| { | ||
| initial_port: 0xD700, | ||
| }, | ||
| device_specific: | ||
| { | ||
| initial_port: 0xD600, | ||
| struct: | ||
| [ | ||
| { | ||
| bytes: 4, | ||
| name: "num_pages", | ||
| read: () => this.num_pages, | ||
| write: data => { /* read only */ }, | ||
| }, | ||
| { | ||
| bytes: 4, | ||
| name: "actual", | ||
| read: () => { | ||
| return this.actual; | ||
| }, | ||
| write: data => { /* read only */ }, | ||
| }, | ||
| { | ||
| bytes: 4, | ||
| name: "free_page_hint_cmd_id", | ||
| read: () => this.fp_cmd, | ||
| write: data => { /* read only */ }, | ||
| } | ||
| ] | ||
| }, | ||
| }); | ||
| } | ||
|
|
||
| VirtioBalloon.prototype.Inflate = function(amount) { | ||
| this.num_pages += amount; | ||
| this.virtio.notify_config_changes(); | ||
| }; | ||
|
|
||
| VirtioBalloon.prototype.Deflate = function(amount) { | ||
| this.num_pages -= amount; | ||
| this.virtio.notify_config_changes(); | ||
| }; | ||
|
|
||
| VirtioBalloon.prototype.Cleanup = function(cb) { | ||
| this.fp_cmd = 2; | ||
| this.free_cb = cb; | ||
| this.zeroed = 0; | ||
| this.virtio.notify_config_changes(); | ||
| }; | ||
|
|
||
|
|
||
| VirtioBalloon.prototype.get_state = function() | ||
| { | ||
| const state = []; | ||
| state[0] = this.virtio; | ||
| state[1] = this.num_pages; | ||
| state[2] = this.actual; | ||
| return state; | ||
| }; | ||
|
|
||
| VirtioBalloon.prototype.set_state = function(state) | ||
| { | ||
| this.virtio.set_state(state[0]); | ||
| this.num_pages = state[1]; | ||
| this.actual = state[2]; | ||
| }; | ||
|
|
||
| VirtioBalloon.prototype.GetStats = function(data) | ||
| { | ||
| this.stats_cb = data; | ||
| const queue = this.virtio.queues[2]; | ||
| while(queue.has_request()) | ||
| { | ||
| const bufchain = queue.pop_request(); | ||
| this.virtio.queues[2].push_reply(bufchain); | ||
| } | ||
| this.virtio.queues[2].flush_replies(); | ||
| }; | ||
|
|
||
| VirtioBalloon.prototype.Reset = function() { | ||
|
|
||
| }; |
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