--- /dev/null
+/*
+ * Inter-VM Shared Memory PCI device.
+ *
+ * Author:
+ * Cam Macdonell <cam@cs.ualberta.ca>
+ *
+ * Based On: cirrus_vga.c
+ * Copyright (c) 2004 Fabrice Bellard
+ * Copyright (c) 2004 Makoto Suzuki (suzu)
+ *
+ * and rtl8139.c
+ * Copyright (c) 2006 Igor Kovalenko
+ *
+ * This code is licensed under the GNU GPL v2.
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+#include "hw/hw.h"
+#include "hw/i386/pc.h"
+#include "hw/pci/pci.h"
+#include "hw/pci/msix.h"
+#include "sysemu/kvm.h"
+#include "migration/migration.h"
+#include "qemu/error-report.h"
+#include "qemu/event_notifier.h"
+#include "qemu/fifo8.h"
+#include "sysemu/char.h"
+
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <limits.h>
+
+#define PCI_VENDOR_ID_IVSHMEM PCI_VENDOR_ID_REDHAT_QUMRANET
+#define PCI_DEVICE_ID_IVSHMEM 0x1110
+
+#define IVSHMEM_IOEVENTFD 0
+#define IVSHMEM_MSI 1
+
+#define IVSHMEM_PEER 0
+#define IVSHMEM_MASTER 1
+
+#define IVSHMEM_REG_BAR_SIZE 0x100
+
+//#define DEBUG_IVSHMEM
+#ifdef DEBUG_IVSHMEM
+#define IVSHMEM_DPRINTF(fmt, ...) \
+ do {printf("IVSHMEM: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define IVSHMEM_DPRINTF(fmt, ...)
+#endif
+
+#define TYPE_IVSHMEM "ivshmem"
+#define IVSHMEM(obj) \
+ OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM)
+
+typedef struct Peer {
+ int nb_eventfds;
+ EventNotifier *eventfds;
+} Peer;
+
+typedef struct EventfdEntry {
+ PCIDevice *pdev;
+ int vector;
+} EventfdEntry;
+
+typedef struct IVShmemState {
+ /*< private >*/
+ PCIDevice parent_obj;
+ /*< public >*/
+
+ uint32_t intrmask;
+ uint32_t intrstatus;
+ uint32_t doorbell;
+
+ CharDriverState **eventfd_chr;
+ CharDriverState *server_chr;
+ Fifo8 incoming_fifo;
+ MemoryRegion ivshmem_mmio;
+
+ /* We might need to register the BAR before we actually have the memory.
+ * So prepare a container MemoryRegion for the BAR immediately and
+ * add a subregion when we have the memory.
+ */
+ MemoryRegion bar;
+ MemoryRegion ivshmem;
+ uint64_t ivshmem_size; /* size of shared memory region */
+ uint32_t ivshmem_attr;
+ uint32_t ivshmem_64bit;
+ int shm_fd; /* shared memory file descriptor */
+
+ Peer *peers;
+ int nb_peers; /* how many guests we have space for */
+ int max_peer; /* maximum numbered peer */
+
+ int vm_id;
+ uint32_t vectors;
+ uint32_t features;
+ EventfdEntry *eventfd_table;
+
+ Error *migration_blocker;
+
+ char * shmobj;
+ char * sizearg;
+ char * role;
+ int role_val; /* scalar to avoid multiple string comparisons */
+} IVShmemState;
+
+/* registers for the Inter-VM shared memory device */
+enum ivshmem_registers {
+ INTRMASK = 0,
+ INTRSTATUS = 4,
+ IVPOSITION = 8,
+ DOORBELL = 12,
+};
+
+static inline uint32_t ivshmem_has_feature(IVShmemState *ivs,
+ unsigned int feature) {
+ return (ivs->features & (1 << feature));
+}
+
+static inline bool is_power_of_two(uint64_t x) {
+ return (x & (x - 1)) == 0;
+}
+
+/* accessing registers - based on rtl8139 */
+static void ivshmem_update_irq(IVShmemState *s, int val)
+{
+ PCIDevice *d = PCI_DEVICE(s);
+ int isr;
+ isr = (s->intrstatus & s->intrmask) & 0xffffffff;
+
+ /* don't print ISR resets */
+ if (isr) {
+ IVSHMEM_DPRINTF("Set IRQ to %d (%04x %04x)\n",
+ isr ? 1 : 0, s->intrstatus, s->intrmask);
+ }
+
+ pci_set_irq(d, (isr != 0));
+}
+
+static void ivshmem_IntrMask_write(IVShmemState *s, uint32_t val)
+{
+ IVSHMEM_DPRINTF("IntrMask write(w) val = 0x%04x\n", val);
+
+ s->intrmask = val;
+
+ ivshmem_update_irq(s, val);
+}
+
+static uint32_t ivshmem_IntrMask_read(IVShmemState *s)
+{
+ uint32_t ret = s->intrmask;
+
+ IVSHMEM_DPRINTF("intrmask read(w) val = 0x%04x\n", ret);
+
+ return ret;
+}
+
+static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val)
+{
+ IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val);
+
+ s->intrstatus = val;
+
+ ivshmem_update_irq(s, val);
+}
+
+static uint32_t ivshmem_IntrStatus_read(IVShmemState *s)
+{
+ uint32_t ret = s->intrstatus;
+
+ /* reading ISR clears all interrupts */
+ s->intrstatus = 0;
+
+ ivshmem_update_irq(s, 0);
+
+ return ret;
+}
+
+static void ivshmem_io_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned size)
+{
+ IVShmemState *s = opaque;
+
+ uint16_t dest = val >> 16;
+ uint16_t vector = val & 0xff;
+
+ addr &= 0xfc;
+
+ IVSHMEM_DPRINTF("writing to addr " TARGET_FMT_plx "\n", addr);
+ switch (addr)
+ {
+ case INTRMASK:
+ ivshmem_IntrMask_write(s, val);
+ break;
+
+ case INTRSTATUS:
+ ivshmem_IntrStatus_write(s, val);
+ break;
+
+ case DOORBELL:
+ /* check that dest VM ID is reasonable */
+ if (dest > s->max_peer) {
+ IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest);
+ break;
+ }
+
+ /* check doorbell range */
+ if (vector < s->peers[dest].nb_eventfds) {
+ IVSHMEM_DPRINTF("Notifying VM %d on vector %d\n", dest, vector);
+ event_notifier_set(&s->peers[dest].eventfds[vector]);
+ }
+ break;
+ default:
+ IVSHMEM_DPRINTF("Invalid VM Doorbell VM %d\n", dest);
+ }
+}
+
+static uint64_t ivshmem_io_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+
+ IVShmemState *s = opaque;
+ uint32_t ret;
+
+ switch (addr)
+ {
+ case INTRMASK:
+ ret = ivshmem_IntrMask_read(s);
+ break;
+
+ case INTRSTATUS:
+ ret = ivshmem_IntrStatus_read(s);
+ break;
+
+ case IVPOSITION:
+ /* return my VM ID if the memory is mapped */
+ if (s->shm_fd > 0) {
+ ret = s->vm_id;
+ } else {
+ ret = -1;
+ }
+ break;
+
+ default:
+ IVSHMEM_DPRINTF("why are we reading " TARGET_FMT_plx "\n", addr);
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static const MemoryRegionOps ivshmem_mmio_ops = {
+ .read = ivshmem_io_read,
+ .write = ivshmem_io_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .impl = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
+};
+
+static void ivshmem_receive(void *opaque, const uint8_t *buf, int size)
+{
+ IVShmemState *s = opaque;
+
+ ivshmem_IntrStatus_write(s, *buf);
+
+ IVSHMEM_DPRINTF("ivshmem_receive 0x%02x\n", *buf);
+}
+
+static int ivshmem_can_receive(void * opaque)
+{
+ return 8;
+}
+
+static void ivshmem_event(void *opaque, int event)
+{
+ IVSHMEM_DPRINTF("ivshmem_event %d\n", event);
+}
+
+static void fake_irqfd(void *opaque, const uint8_t *buf, int size) {
+
+ EventfdEntry *entry = opaque;
+ PCIDevice *pdev = entry->pdev;
+
+ IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, entry->vector);
+ msix_notify(pdev, entry->vector);
+}
+
+static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *n,
+ int vector)
+{
+ /* create a event character device based on the passed eventfd */
+ IVShmemState *s = opaque;
+ CharDriverState * chr;
+ int eventfd = event_notifier_get_fd(n);
+
+ chr = qemu_chr_open_eventfd(eventfd);
+
+ if (chr == NULL) {
+ error_report("creating eventfd for eventfd %d failed", eventfd);
+ exit(1);
+ }
+ qemu_chr_fe_claim_no_fail(chr);
+
+ /* if MSI is supported we need multiple interrupts */
+ if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
+ s->eventfd_table[vector].pdev = PCI_DEVICE(s);
+ s->eventfd_table[vector].vector = vector;
+
+ qemu_chr_add_handlers(chr, ivshmem_can_receive, fake_irqfd,
+ ivshmem_event, &s->eventfd_table[vector]);
+ } else {
+ qemu_chr_add_handlers(chr, ivshmem_can_receive, ivshmem_receive,
+ ivshmem_event, s);
+ }
+
+ return chr;
+
+}
+
+static int check_shm_size(IVShmemState *s, int fd) {
+ /* check that the guest isn't going to try and map more memory than the
+ * the object has allocated return -1 to indicate error */
+
+ struct stat buf;
+
+ if (fstat(fd, &buf) < 0) {
+ error_report("exiting: fstat on fd %d failed: %s",
+ fd, strerror(errno));
+ return -1;
+ }
+
+ if (s->ivshmem_size > buf.st_size) {
+ error_report("Requested memory size greater"
+ " than shared object size (%" PRIu64 " > %" PRIu64")",
+ s->ivshmem_size, (uint64_t)buf.st_size);
+ return -1;
+ } else {
+ return 0;
+ }
+}
+
+/* create the shared memory BAR when we are not using the server, so we can
+ * create the BAR and map the memory immediately */
+static void create_shared_memory_BAR(IVShmemState *s, int fd) {
+
+ void * ptr;
+
+ s->shm_fd = fd;
+
+ ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+
+ memory_region_init_ram_ptr(&s->ivshmem, OBJECT(s), "ivshmem.bar2",
+ s->ivshmem_size, ptr);
+ vmstate_register_ram(&s->ivshmem, DEVICE(s));
+ memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
+
+ /* region for shared memory */
+ pci_register_bar(PCI_DEVICE(s), 2, s->ivshmem_attr, &s->bar);
+}
+
+static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i)
+{
+ memory_region_add_eventfd(&s->ivshmem_mmio,
+ DOORBELL,
+ 4,
+ true,
+ (posn << 16) | i,
+ &s->peers[posn].eventfds[i]);
+}
+
+static void ivshmem_del_eventfd(IVShmemState *s, int posn, int i)
+{
+ memory_region_del_eventfd(&s->ivshmem_mmio,
+ DOORBELL,
+ 4,
+ true,
+ (posn << 16) | i,
+ &s->peers[posn].eventfds[i]);
+}
+
+static void close_guest_eventfds(IVShmemState *s, int posn)
+{
+ int i, guest_curr_max;
+
+ if (!ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
+ return;
+ }
+ if (posn < 0 || posn >= s->nb_peers) {
+ return;
+ }
+
+ guest_curr_max = s->peers[posn].nb_eventfds;
+
+ memory_region_transaction_begin();
+ for (i = 0; i < guest_curr_max; i++) {
+ ivshmem_del_eventfd(s, posn, i);
+ }
+ memory_region_transaction_commit();
+ for (i = 0; i < guest_curr_max; i++) {
+ event_notifier_cleanup(&s->peers[posn].eventfds[i]);
+ }
+
+ g_free(s->peers[posn].eventfds);
+ s->peers[posn].nb_eventfds = 0;
+}
+
+/* this function increase the dynamic storage need to store data about other
+ * guests */
+static int increase_dynamic_storage(IVShmemState *s, int new_min_size)
+{
+
+ int j, old_nb_alloc;
+
+ /* check for integer overflow */
+ if (new_min_size >= INT_MAX / sizeof(Peer) - 1 || new_min_size <= 0) {
+ return -1;
+ }
+
+ old_nb_alloc = s->nb_peers;
+
+ if (new_min_size >= s->nb_peers) {
+ /* +1 because #new_min_size is used as last array index */
+ s->nb_peers = new_min_size + 1;
+ } else {
+ return 0;
+ }
+
+ IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers);
+ s->peers = g_realloc(s->peers, s->nb_peers * sizeof(Peer));
+
+ /* zero out new pointers */
+ for (j = old_nb_alloc; j < s->nb_peers; j++) {
+ s->peers[j].eventfds = NULL;
+ s->peers[j].nb_eventfds = 0;
+ }
+
+ return 0;
+}
+
+static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
+{
+ IVShmemState *s = opaque;
+ int incoming_fd, tmp_fd;
+ int guest_max_eventfd;
+ long incoming_posn;
+
+ if (fifo8_is_empty(&s->incoming_fifo) && size == sizeof(incoming_posn)) {
+ memcpy(&incoming_posn, buf, size);
+ } else {
+ const uint8_t *p;
+ uint32_t num;
+
+ IVSHMEM_DPRINTF("short read of %d bytes\n", size);
+ num = MAX(size, sizeof(long) - fifo8_num_used(&s->incoming_fifo));
+ fifo8_push_all(&s->incoming_fifo, buf, num);
+ if (fifo8_num_used(&s->incoming_fifo) < sizeof(incoming_posn)) {
+ return;
+ }
+ size -= num;
+ buf += num;
+ p = fifo8_pop_buf(&s->incoming_fifo, sizeof(incoming_posn), &num);
+ g_assert(num == sizeof(incoming_posn));
+ memcpy(&incoming_posn, p, sizeof(incoming_posn));
+ if (size > 0) {
+ fifo8_push_all(&s->incoming_fifo, buf, size);
+ }
+ }
+
+ if (incoming_posn < -1) {
+ IVSHMEM_DPRINTF("invalid incoming_posn %ld\n", incoming_posn);
+ return;
+ }
+
+ /* pick off s->server_chr->msgfd and store it, posn should accompany msg */
+ tmp_fd = qemu_chr_fe_get_msgfd(s->server_chr);
+ IVSHMEM_DPRINTF("posn is %ld, fd is %d\n", incoming_posn, tmp_fd);
+
+ /* make sure we have enough space for this guest */
+ if (incoming_posn >= s->nb_peers) {
+ if (increase_dynamic_storage(s, incoming_posn) < 0) {
+ error_report("increase_dynamic_storage() failed");
+ if (tmp_fd != -1) {
+ close(tmp_fd);
+ }
+ return;
+ }
+ }
+
+ if (tmp_fd == -1) {
+ /* if posn is positive and unseen before then this is our posn*/
+ if ((incoming_posn >= 0) &&
+ (s->peers[incoming_posn].eventfds == NULL)) {
+ /* receive our posn */
+ s->vm_id = incoming_posn;
+ return;
+ } else {
+ /* otherwise an fd == -1 means an existing guest has gone away */
+ IVSHMEM_DPRINTF("posn %ld has gone away\n", incoming_posn);
+ close_guest_eventfds(s, incoming_posn);
+ return;
+ }
+ }
+
+ /* because of the implementation of get_msgfd, we need a dup */
+ incoming_fd = dup(tmp_fd);
+
+ if (incoming_fd == -1) {
+ error_report("could not allocate file descriptor %s", strerror(errno));
+ close(tmp_fd);
+ return;
+ }
+
+ /* if the position is -1, then it's shared memory region fd */
+ if (incoming_posn == -1) {
+
+ void * map_ptr;
+
+ s->max_peer = 0;
+
+ if (check_shm_size(s, incoming_fd) == -1) {
+ exit(1);
+ }
+
+ /* mmap the region and map into the BAR2 */
+ map_ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED,
+ incoming_fd, 0);
+ memory_region_init_ram_ptr(&s->ivshmem, OBJECT(s),
+ "ivshmem.bar2", s->ivshmem_size, map_ptr);
+ vmstate_register_ram(&s->ivshmem, DEVICE(s));
+
+ IVSHMEM_DPRINTF("guest h/w addr = %p, size = %" PRIu64 "\n",
+ map_ptr, s->ivshmem_size);
+
+ memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
+
+ /* only store the fd if it is successfully mapped */
+ s->shm_fd = incoming_fd;
+
+ return;
+ }
+
+ /* each guest has an array of eventfds, and we keep track of how many
+ * guests for each VM */
+ guest_max_eventfd = s->peers[incoming_posn].nb_eventfds;
+
+ if (guest_max_eventfd == 0) {
+ /* one eventfd per MSI vector */
+ s->peers[incoming_posn].eventfds = g_new(EventNotifier, s->vectors);
+ }
+
+ /* this is an eventfd for a particular guest VM */
+ IVSHMEM_DPRINTF("eventfds[%ld][%d] = %d\n", incoming_posn,
+ guest_max_eventfd, incoming_fd);
+ event_notifier_init_fd(&s->peers[incoming_posn].eventfds[guest_max_eventfd],
+ incoming_fd);
+
+ /* increment count for particular guest */
+ s->peers[incoming_posn].nb_eventfds++;
+
+ /* keep track of the maximum VM ID */
+ if (incoming_posn > s->max_peer) {
+ s->max_peer = incoming_posn;
+ }
+
+ if (incoming_posn == s->vm_id) {
+ s->eventfd_chr[guest_max_eventfd] = create_eventfd_chr_device(s,
+ &s->peers[s->vm_id].eventfds[guest_max_eventfd],
+ guest_max_eventfd);
+ }
+
+ if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
+ ivshmem_add_eventfd(s, incoming_posn, guest_max_eventfd);
+ }
+}
+
+/* Select the MSI-X vectors used by device.
+ * ivshmem maps events to vectors statically, so
+ * we just enable all vectors on init and after reset. */
+static void ivshmem_use_msix(IVShmemState * s)
+{
+ PCIDevice *d = PCI_DEVICE(s);
+ int i;
+
+ if (!msix_present(d)) {
+ return;
+ }
+
+ for (i = 0; i < s->vectors; i++) {
+ msix_vector_use(d, i);
+ }
+}
+
+static void ivshmem_reset(DeviceState *d)
+{
+ IVShmemState *s = IVSHMEM(d);
+
+ s->intrstatus = 0;
+ ivshmem_use_msix(s);
+}
+
+static uint64_t ivshmem_get_size(IVShmemState * s) {
+
+ uint64_t value;
+ char *ptr;
+
+ value = strtoull(s->sizearg, &ptr, 10);
+ switch (*ptr) {
+ case 0: case 'M': case 'm':
+ value <<= 20;
+ break;
+ case 'G': case 'g':
+ value <<= 30;
+ break;
+ default:
+ error_report("invalid ram size: %s", s->sizearg);
+ exit(1);
+ }
+
+ /* BARs must be a power of 2 */
+ if (!is_power_of_two(value)) {
+ error_report("size must be power of 2");
+ exit(1);
+ }
+
+ return value;
+}
+
+static void ivshmem_setup_msi(IVShmemState * s)
+{
+ if (msix_init_exclusive_bar(PCI_DEVICE(s), s->vectors, 1)) {
+ IVSHMEM_DPRINTF("msix initialization failed\n");
+ exit(1);
+ }
+
+ IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
+
+ /* allocate QEMU char devices for receiving interrupts */
+ s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry));
+
+ ivshmem_use_msix(s);
+}
+
+static void ivshmem_save(QEMUFile* f, void *opaque)
+{
+ IVShmemState *proxy = opaque;
+ PCIDevice *pci_dev = PCI_DEVICE(proxy);
+
+ IVSHMEM_DPRINTF("ivshmem_save\n");
+ pci_device_save(pci_dev, f);
+
+ if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
+ msix_save(pci_dev, f);
+ } else {
+ qemu_put_be32(f, proxy->intrstatus);
+ qemu_put_be32(f, proxy->intrmask);
+ }
+
+}
+
+static int ivshmem_load(QEMUFile* f, void *opaque, int version_id)
+{
+ IVSHMEM_DPRINTF("ivshmem_load\n");
+
+ IVShmemState *proxy = opaque;
+ PCIDevice *pci_dev = PCI_DEVICE(proxy);
+ int ret;
+
+ if (version_id > 0) {
+ return -EINVAL;
+ }
+
+ if (proxy->role_val == IVSHMEM_PEER) {
+ error_report("'peer' devices are not migratable");
+ return -EINVAL;
+ }
+
+ ret = pci_device_load(pci_dev, f);
+ if (ret) {
+ return ret;
+ }
+
+ if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
+ msix_load(pci_dev, f);
+ ivshmem_use_msix(proxy);
+ } else {
+ proxy->intrstatus = qemu_get_be32(f);
+ proxy->intrmask = qemu_get_be32(f);
+ }
+
+ return 0;
+}
+
+static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address,
+ uint32_t val, int len)
+{
+ pci_default_write_config(pci_dev, address, val, len);
+}
+
+static int pci_ivshmem_init(PCIDevice *dev)
+{
+ IVShmemState *s = IVSHMEM(dev);
+ uint8_t *pci_conf;
+
+ if (s->sizearg == NULL)
+ s->ivshmem_size = 4 << 20; /* 4 MB default */
+ else {
+ s->ivshmem_size = ivshmem_get_size(s);
+ }
+
+ fifo8_create(&s->incoming_fifo, sizeof(long));
+
+ register_savevm(DEVICE(dev), "ivshmem", 0, 0, ivshmem_save, ivshmem_load,
+ dev);
+
+ /* IRQFD requires MSI */
+ if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
+ !ivshmem_has_feature(s, IVSHMEM_MSI)) {
+ error_report("ioeventfd/irqfd requires MSI");
+ exit(1);
+ }
+
+ /* check that role is reasonable */
+ if (s->role) {
+ if (strncmp(s->role, "peer", 5) == 0) {
+ s->role_val = IVSHMEM_PEER;
+ } else if (strncmp(s->role, "master", 7) == 0) {
+ s->role_val = IVSHMEM_MASTER;
+ } else {
+ error_report("'role' must be 'peer' or 'master'");
+ exit(1);
+ }
+ } else {
+ s->role_val = IVSHMEM_MASTER; /* default */
+ }
+
+ if (s->role_val == IVSHMEM_PEER) {
+ error_setg(&s->migration_blocker,
+ "Migration is disabled when using feature 'peer mode' in device 'ivshmem'");
+ migrate_add_blocker(s->migration_blocker);
+ }
+
+ pci_conf = dev->config;
+ pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
+
+ pci_config_set_interrupt_pin(pci_conf, 1);
+
+ s->shm_fd = 0;
+
+ memory_region_init_io(&s->ivshmem_mmio, OBJECT(s), &ivshmem_mmio_ops, s,
+ "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE);
+
+ /* region for registers*/
+ pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY,
+ &s->ivshmem_mmio);
+
+ memory_region_init(&s->bar, OBJECT(s), "ivshmem-bar2-container", s->ivshmem_size);
+ s->ivshmem_attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
+ PCI_BASE_ADDRESS_MEM_PREFETCH;
+ if (s->ivshmem_64bit) {
+ s->ivshmem_attr |= PCI_BASE_ADDRESS_MEM_TYPE_64;
+ }
+
+ if ((s->server_chr != NULL) &&
+ (strncmp(s->server_chr->filename, "unix:", 5) == 0)) {
+ /* if we get a UNIX socket as the parameter we will talk
+ * to the ivshmem server to receive the memory region */
+
+ if (s->shmobj != NULL) {
+ error_report("WARNING: do not specify both 'chardev' "
+ "and 'shm' with ivshmem");
+ }
+
+ IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
+ s->server_chr->filename);
+
+ if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
+ ivshmem_setup_msi(s);
+ }
+
+ /* we allocate enough space for 16 guests and grow as needed */
+ s->nb_peers = 16;
+ s->vm_id = -1;
+
+ /* allocate/initialize space for interrupt handling */
+ s->peers = g_malloc0(s->nb_peers * sizeof(Peer));
+
+ pci_register_bar(dev, 2, s->ivshmem_attr, &s->bar);
+
+ s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *));
+
+ qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read,
+ ivshmem_event, s);
+ } else {
+ /* just map the file immediately, we're not using a server */
+ int fd;
+
+ if (s->shmobj == NULL) {
+ error_report("Must specify 'chardev' or 'shm' to ivshmem");
+ exit(1);
+ }
+
+ IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj);
+
+ /* try opening with O_EXCL and if it succeeds zero the memory
+ * by truncating to 0 */
+ if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR|O_EXCL,
+ S_IRWXU|S_IRWXG|S_IRWXO)) > 0) {
+ /* truncate file to length PCI device's memory */
+ if (ftruncate(fd, s->ivshmem_size) != 0) {
+ error_report("could not truncate shared file");
+ }
+
+ } else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR,
+ S_IRWXU|S_IRWXG|S_IRWXO)) < 0) {
+ error_report("could not open shared file");
+ exit(1);
+
+ }
+
+ if (check_shm_size(s, fd) == -1) {
+ exit(1);
+ }
+
+ create_shared_memory_BAR(s, fd);
+
+ }
+
+ dev->config_write = ivshmem_write_config;
+
+ return 0;
+}
+
+static void pci_ivshmem_uninit(PCIDevice *dev)
+{
+ IVShmemState *s = IVSHMEM(dev);
+
+ if (s->migration_blocker) {
+ migrate_del_blocker(s->migration_blocker);
+ error_free(s->migration_blocker);
+ }
+
+ memory_region_del_subregion(&s->bar, &s->ivshmem);
+ vmstate_unregister_ram(&s->ivshmem, DEVICE(dev));
+ unregister_savevm(DEVICE(dev), "ivshmem", s);
+ fifo8_destroy(&s->incoming_fifo);
+}
+
+static Property ivshmem_properties[] = {
+ DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
+ DEFINE_PROP_STRING("size", IVShmemState, sizearg),
+ DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
+ DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD, false),
+ DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true),
+ DEFINE_PROP_STRING("shm", IVShmemState, shmobj),
+ DEFINE_PROP_STRING("role", IVShmemState, role),
+ DEFINE_PROP_UINT32("use64", IVShmemState, ivshmem_64bit, 1),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void ivshmem_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+ k->init = pci_ivshmem_init;
+ k->exit = pci_ivshmem_uninit;
+ k->vendor_id = PCI_VENDOR_ID_IVSHMEM;
+ k->device_id = PCI_DEVICE_ID_IVSHMEM;
+ k->class_id = PCI_CLASS_MEMORY_RAM;
+ dc->reset = ivshmem_reset;
+ dc->props = ivshmem_properties;
+ set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+}
+
+static const TypeInfo ivshmem_info = {
+ .name = TYPE_IVSHMEM,
+ .parent = TYPE_PCI_DEVICE,
+ .instance_size = sizeof(IVShmemState),
+ .class_init = ivshmem_class_init,
+};
+
+static void ivshmem_register_types(void)
+{
+ type_register_static(&ivshmem_info);
+}
+
+type_init(ivshmem_register_types)
Code Review / kvmfornfv.git / blobdiff