From: Jack Lange Date: Tue, 4 Aug 2009 01:03:37 +0000 (-0500) Subject: added virtio balloon device, currently discards free pages... X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=commitdiff_plain;h=217e4d9dbb18e7c8dfd26f9fd74770614dd2024c added virtio balloon device, currently discards free pages... --- diff --git a/palacios/build/Makefile b/palacios/build/Makefile index 952659b..d373579 100644 --- a/palacios/build/Makefile +++ b/palacios/build/Makefile @@ -349,6 +349,7 @@ DEVICES_OBJS := \ devices/net_cd.o \ devices/net_hd.o \ devices/lnx_virtio_blk.o \ + devices/lnx_virtio_balloon.o \ devices/sym_swap.o \ # devices/ne2k.o \ diff --git a/palacios/include/devices/lnx_virtio_pci.h b/palacios/include/devices/lnx_virtio_pci.h index b3bb6c8..9e6e69f 100644 --- a/palacios/include/devices/lnx_virtio_pci.h +++ b/palacios/include/devices/lnx_virtio_pci.h @@ -36,7 +36,7 @@ #define VIRTIO_CONSOLE_DEV_ID 0x1003 #define VIRTIO_BLOCK_SUBDEVICE_ID 2 - +#define VIRTIO_BALLOON_SUBDEVICE_ID 5 #define HOST_FEATURES_PORT 0 diff --git a/palacios/src/devices/lnx_virtio_balloon.c b/palacios/src/devices/lnx_virtio_balloon.c new file mode 100644 index 0000000..807f68d --- /dev/null +++ b/palacios/src/devices/lnx_virtio_balloon.c @@ -0,0 +1,506 @@ +/* + * This file is part of the Palacios Virtual Machine Monitor developed + * by the V3VEE Project with funding from the United States National + * Science Foundation and the Department of Energy. + * + * The V3VEE Project is a joint project between Northwestern University + * and the University of New Mexico. You can find out more at + * http://www.v3vee.org + * + * Copyright (c) 2008, Jack Lange + * Copyright (c) 2008, The V3VEE Project + * All rights reserved. + * + * Author: Jack Lange + * + * This is free software. You are permitted to use, + * redistribute, and modify it as specified in the file "V3VEE_LICENSE". + */ + +#include +#include +#include +#include + +#include + + +#define BLN_REQUESTED_PORT 20 +#define BLN_ALLOCATED_PORT 28 + + +#define PAGE_SIZE 4096 + +#define BALLOON_HCALL 0xba00 + +struct balloon_config { + uint32_t requested_pages; + uint32_t allocated_pages; +} __attribute__((packed)); + + + +/* How this works: + * A ballooning request is made by specifying the new memory size of the guest. The guest + * will then shrink the amount of of memory it uses to target. The target size is stored in the + * Virtio PCI configuration space in the requested pages field. The device raises its irq, to notify the guest + * + * The guest might not be able to shrink to target, so it stores the size it was able to shrink to + * into the allocate_pages field of the pci configuration space. + * + * When the guest frees pages it writes the addresses to the deflation queue (the 2nd one), and does a kick. + * When pages are given back to the host they are fed in via the inflation queue (the 1st one), and raises an irq. + */ + + +#define QUEUE_SIZE 128 + +/* Host Feature flags */ +#define VIRTIO_NOTIFY_HOST 0x01 + + + + + +struct virtio_balloon_state { + struct balloon_config balloon_cfg; + struct virtio_config virtio_cfg; + + struct vm_device * pci_bus; + struct pci_device * pci_dev; + + struct virtio_queue queue[2]; + + + struct virtio_queue * cur_queue; + + int io_range_size; +}; + + +static int virtio_free(struct vm_device * dev) { + return -1; +} + +static int virtio_reset(struct vm_device * dev) { + struct virtio_balloon_state * virtio = (struct virtio_balloon_state *)dev->private_data; + + memset(virtio->queue, 0, sizeof(struct virtio_queue) * 2); + + virtio->cur_queue = &(virtio->queue[0]); + + + virtio->virtio_cfg.status = 0; + virtio->virtio_cfg.pci_isr = 0; + + + /* Balloon configuration */ + virtio->virtio_cfg.host_features = VIRTIO_NOTIFY_HOST; + + // Virtio Balloon uses two queues + virtio->queue[0].queue_size = QUEUE_SIZE; + virtio->queue[1].queue_size = QUEUE_SIZE; + + + memset(&(virtio->balloon_cfg), 0, sizeof(struct balloon_config)); + + return 0; +} + + + + +static int handle_kick(struct vm_device * dev) { + struct virtio_balloon_state * virtio = (struct virtio_balloon_state *)dev->private_data; + struct virtio_queue * q = virtio->cur_queue; + + PrintDebug("VIRTIO KICK: cur_index=%d, avail_index=%d\n", q->cur_avail_idx, q->avail->index); + + while (q->cur_avail_idx < q->avail->index) { + struct vring_desc * hdr_desc = NULL; + struct vring_desc * buf_desc = NULL; + struct vring_desc * status_desc = NULL; + uint16_t chain_idx = q->avail->ring[q->cur_avail_idx]; + uint32_t req_len = 0; + int chained = 1; + + PrintDebug("chained=%d, Chain Index=%d\n", chained, chain_idx); + + while (chained) { + hdr_desc = &(q->desc[chain_idx]); + + PrintDebug("Header Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", hdr_desc, + (void *)(hdr_desc->addr_gpa), hdr_desc->length, hdr_desc->flags, hdr_desc->next); + + if (!(hdr_desc->flags & VIRTIO_NEXT_FLAG)) { + PrintError("Balloon operations must chain a buffer descriptor\n"); + return -1; + } + + buf_desc = &(q->desc[hdr_desc->next]); + + PrintDebug("Buffer Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", buf_desc, + (void *)(buf_desc->addr_gpa), buf_desc->length, buf_desc->flags, buf_desc->next); + + if (!(buf_desc->flags & VIRTIO_NEXT_FLAG)) { + PrintError("Balloon operatoins must chain a status descriptor\n"); + return -1; + } + + status_desc = &(q->desc[buf_desc->next]); + + // We detect whether we are chained here... + if (status_desc->flags & VIRTIO_NEXT_FLAG) { + chained = 1; + chain_idx = status_desc->next; + } else { + chained = 0; + } + + PrintDebug("Status Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", status_desc, + (void *)(status_desc->addr_gpa), status_desc->length, status_desc->flags, status_desc->next); + + + /* + if (handle_balloon_op(dev, hdr_desc, buf_desc, status_desc) == -1) { + PrintError("Error handling balloon operation\n"); + return -1; + } + */ + + PrintDebug("Guest Balloon Currently Ignored\n"); + PrintDebug("\t Requested=%d, Allocated=%d\n", virtio->balloon_cfg.requested_pages, virtio->balloon_cfg.allocated_pages); + + + req_len += (buf_desc->length + status_desc->length); + } + + q->used->ring[q->used->index].id = q->avail->ring[q->cur_avail_idx]; + q->used->ring[q->used->index].length = req_len; // What do we set this to???? + + q->used->index = (q->used->index + 1) % (QUEUE_SIZE * sizeof(struct vring_desc));; + + + q->cur_avail_idx = (q->cur_avail_idx + 1) % (QUEUE_SIZE * sizeof(struct vring_desc)); + } + + if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) { + PrintDebug("Raising IRQ %d\n", virtio->pci_dev->config_header.intr_line); + v3_pci_raise_irq(virtio->pci_bus, 0, virtio->pci_dev); + virtio->virtio_cfg.pci_isr = 1; + } + + return 0; +} + +static int virtio_io_write(uint16_t port, void * src, uint_t length, struct vm_device * dev) { + struct virtio_balloon_state * virtio = (struct virtio_balloon_state *)dev->private_data; + int port_idx = port % virtio->io_range_size; + + + PrintDebug("VIRTIO BALLOON Write for port %d (index=%d) len=%d, value=%x\n", + port, port_idx, length, *(uint32_t *)src); + + + + switch (port_idx) { + case GUEST_FEATURES_PORT: + if (length != 4) { + PrintError("Illegal write length for guest features\n"); + return -1; + } + + virtio->virtio_cfg.guest_features = *(uint32_t *)src; + + break; + case VRING_PG_NUM_PORT: + if (length == 4) { + addr_t pfn = *(uint32_t *)src; + addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT); + + + virtio->cur_queue->pfn = pfn; + + virtio->cur_queue->ring_desc_addr = page_addr ; + virtio->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc)); + virtio->cur_queue->ring_used_addr = ( virtio->cur_queue->ring_avail_addr + \ + sizeof(struct vring_avail) + \ + (QUEUE_SIZE * sizeof(uint16_t))); + + // round up to next page boundary. + virtio->cur_queue->ring_used_addr = (virtio->cur_queue->ring_used_addr + 0xfff) & ~0xfff; + + if (guest_pa_to_host_va(dev->vm, virtio->cur_queue->ring_desc_addr, (addr_t *)&(virtio->cur_queue->desc)) == -1) { + PrintError("Could not translate ring descriptor address\n"); + return -1; + } + + + if (guest_pa_to_host_va(dev->vm, virtio->cur_queue->ring_avail_addr, (addr_t *)&(virtio->cur_queue->avail)) == -1) { + PrintError("Could not translate ring available address\n"); + return -1; + } + + + if (guest_pa_to_host_va(dev->vm, virtio->cur_queue->ring_used_addr, (addr_t *)&(virtio->cur_queue->used)) == -1) { + PrintError("Could not translate ring used address\n"); + return -1; + } + + PrintDebug("RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n", + (void *)(virtio->cur_queue->ring_desc_addr), + (void *)(virtio->cur_queue->ring_avail_addr), + (void *)(virtio->cur_queue->ring_used_addr)); + + PrintDebug("RingDesc=%p, Avail=%p, Used=%p\n", + virtio->cur_queue->desc, virtio->cur_queue->avail, virtio->cur_queue->used); + + } else { + PrintError("Illegal write length for page frame number\n"); + return -1; + } + break; + case VRING_Q_SEL_PORT: + virtio->virtio_cfg.vring_queue_selector = *(uint16_t *)src; + + if (virtio->virtio_cfg.vring_queue_selector > 1) { + PrintError("Virtio Balloon device only uses 2 queue, selected %d\n", + virtio->virtio_cfg.vring_queue_selector); + return -1; + } + + virtio->cur_queue = &(virtio->queue[virtio->virtio_cfg.vring_queue_selector]); + + break; + case VRING_Q_NOTIFY_PORT: + PrintDebug("Handling Kick\n"); + if (handle_kick(dev) == -1) { + PrintError("Could not handle Balloon Notification\n"); + return -1; + } + break; + case VIRTIO_STATUS_PORT: + virtio->virtio_cfg.status = *(uint8_t *)src; + + if (virtio->virtio_cfg.status == 0) { + PrintDebug("Resetting device\n"); + virtio_reset(dev); + } + + break; + + case VIRTIO_ISR_PORT: + virtio->virtio_cfg.pci_isr = *(uint8_t *)src; + break; + default: + return -1; + break; + } + + return length; +} + + +static int virtio_io_read(uint16_t port, void * dst, uint_t length, struct vm_device * dev) { + struct virtio_balloon_state * virtio = (struct virtio_balloon_state *)dev->private_data; + int port_idx = port % virtio->io_range_size; + + + PrintDebug("VIRTIO BALLOON Read for port %d (index =%d), length=%d\n", + port, port_idx, length); + + switch (port_idx) { + case HOST_FEATURES_PORT: + if (length != 4) { + PrintError("Illegal read length for host features\n"); + return -1; + } + + *(uint32_t *)dst = virtio->virtio_cfg.host_features; + + break; + case VRING_PG_NUM_PORT: + if (length != 4) { + PrintError("Illegal read length for page frame number\n"); + return -1; + } + + *(uint32_t *)dst = virtio->cur_queue->pfn; + + break; + case VRING_SIZE_PORT: + if (length != 2) { + PrintError("Illegal read length for vring size\n"); + return -1; + } + + *(uint16_t *)dst = virtio->cur_queue->queue_size; + + break; + + case VIRTIO_STATUS_PORT: + if (length != 1) { + PrintError("Illegal read length for status\n"); + return -1; + } + + *(uint8_t *)dst = virtio->virtio_cfg.status; + break; + + case VIRTIO_ISR_PORT: + *(uint8_t *)dst = virtio->virtio_cfg.pci_isr; + virtio->virtio_cfg.pci_isr = 0; + v3_pci_lower_irq(virtio->pci_bus, 0, virtio->pci_dev); + break; + + default: + if ( (port_idx >= sizeof(struct virtio_config)) && + (port_idx < (sizeof(struct virtio_config) + sizeof(struct balloon_config))) ) { + + uint8_t * cfg_ptr = (uint8_t *)&(virtio->balloon_cfg); + memcpy(dst, cfg_ptr, length); + + } else { + PrintError("Read of Unhandled Virtio Read\n"); + return -1; + } + + break; + } + + return length; +} + + + + +static struct v3_device_ops dev_ops = { + .free = virtio_free, + .reset = NULL, + .start = NULL, + .stop = NULL, +}; + + +static int set_size(struct vm_device * dev, addr_t size) { + struct virtio_balloon_state * virtio = (struct virtio_balloon_state *)dev->private_data; + + virtio->balloon_cfg.requested_pages = size / PAGE_SIZE; // number of pages + v3_pci_raise_irq(virtio->pci_bus, 0, virtio->pci_dev); + + return 0; +} + + +static int handle_hcall(struct guest_info * info, uint_t hcall_id, void * priv_data) { + struct vm_device * dev = (struct vm_device *)priv_data; + int tgt_size = info->vm_regs.rcx; + + + return set_size(dev, tgt_size); +} + + + + + +static int virtio_init(struct guest_info * vm, void * cfg_data) { + struct vm_device * pci_bus = v3_find_dev(vm, (char *)cfg_data); + struct virtio_balloon_state * virtio_state = NULL; + struct pci_device * pci_dev = NULL; + + PrintDebug("Initializing VIRTIO Balloon device\n"); + + if (pci_bus == NULL) { + PrintError("VirtIO devices require a PCI Bus"); + return -1; + } + + + virtio_state = (struct virtio_balloon_state *)V3_Malloc(sizeof(struct virtio_balloon_state)); + memset(virtio_state, 0, sizeof(struct virtio_balloon_state)); + + + struct vm_device * dev = v3_allocate_device("LNX_VIRTIO_BALLOON", &dev_ops, virtio_state); + if (v3_attach_device(vm, dev) == -1) { + PrintError("Could not attach device %s\n", "LNX_VIRTIO_BALLOON"); + return -1; + } + + + + + // PCI initialization + { + struct v3_pci_bar bars[6]; + int num_ports = sizeof(struct virtio_config) + sizeof(struct balloon_config); + int tmp_ports = num_ports; + int i; + + + + // This gets the number of ports, rounded up to a power of 2 + virtio_state->io_range_size = 1; // must be a power of 2 + + while (tmp_ports > 0) { + tmp_ports >>= 1; + virtio_state->io_range_size <<= 1; + } + + // this is to account for any low order bits being set in num_ports + // if there are none, then num_ports was already a power of 2 so we shift right to reset it + if ((num_ports & ((virtio_state->io_range_size >> 1) - 1)) == 0) { + virtio_state->io_range_size >>= 1; + } + + + for (i = 0; i < 6; i++) { + bars[i].type = PCI_BAR_NONE; + } + + bars[0].type = PCI_BAR_IO; + bars[0].default_base_port = -1; + bars[0].num_ports = virtio_state->io_range_size; + + bars[0].io_read = virtio_io_read; + bars[0].io_write = virtio_io_write; + + pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE, + 0, PCI_AUTO_DEV_NUM, 0, + "LNX_VIRTIO_BALLOON", bars, + NULL, NULL, NULL, dev); + + if (!pci_dev) { + PrintError("Could not register PCI Device\n"); + return -1; + } + + pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID; + pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID; + + + pci_dev->config_header.device_id = VIRTIO_BALLOON_DEV_ID; + pci_dev->config_header.class = PCI_CLASS_MEMORY; + pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM; + + pci_dev->config_header.subsystem_id = VIRTIO_BALLOON_SUBDEVICE_ID; + + + pci_dev->config_header.intr_pin = 1; + + pci_dev->config_header.max_latency = 1; // ?? (qemu does it...) + + + virtio_state->pci_dev = pci_dev; + virtio_state->pci_bus = pci_bus; + } + + virtio_reset(dev); + + v3_register_hypercall(vm, BALLOON_HCALL, handle_hcall, dev); + + return 0; +} + + +device_register("LNX_VIRTIO_BALLOON", virtio_init) diff --git a/palacios/src/palacios/vmm_config.c b/palacios/src/palacios/vmm_config.c index 00123f3..397b228 100644 --- a/palacios/src/palacios/vmm_config.c +++ b/palacios/src/palacios/vmm_config.c @@ -219,6 +219,7 @@ static int setup_devices(struct guest_info * info, struct v3_vm_config * config_ v3_create_device(info, "LNX_VIRTIO_BLK", "PCI"); + v3_create_device(info, "LNX_VIRTIO_BALLOON", "PCI"); v3_create_device(info, "SYM_SWAP", "LNX_VIRTIO_BLK"); v3_create_device(info, "IDE", &ide_config);