ivshmem: more qdev conversion
Use the latest qemu device modeling API, in particular, convert to realize to fix the error handling; right now a botched device_add ivhsmem command kills the VM. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
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49b2951f84
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@ -319,20 +319,21 @@ static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *
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}
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static int check_shm_size(IVShmemState *s, int fd) {
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static int check_shm_size(IVShmemState *s, int fd, Error **errp)
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{
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/* check that the guest isn't going to try and map more memory than the
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* the object has allocated return -1 to indicate error */
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struct stat buf;
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if (fstat(fd, &buf) < 0) {
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error_report("exiting: fstat on fd %d failed: %s",
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error_setg(errp, "exiting: fstat on fd %d failed: %s",
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fd, strerror(errno));
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return -1;
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}
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if (s->ivshmem_size > buf.st_size) {
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error_report("Requested memory size greater"
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error_setg(errp, "Requested memory size greater"
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" than shared object size (%" PRIu64 " > %" PRIu64")",
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s->ivshmem_size, (uint64_t)buf.st_size);
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return -1;
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@ -343,13 +344,18 @@ static int check_shm_size(IVShmemState *s, int fd) {
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/* create the shared memory BAR when we are not using the server, so we can
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* create the BAR and map the memory immediately */
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static void create_shared_memory_BAR(IVShmemState *s, int fd, uint8_t attr) {
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static int create_shared_memory_BAR(IVShmemState *s, int fd, uint8_t attr,
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Error **errp)
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{
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void * ptr;
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s->shm_fd = fd;
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ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if (ptr == MAP_FAILED) {
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error_setg_errno(errp, errno, "Failed to mmap shared memory");
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return -1;
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}
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s->shm_fd = fd;
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memory_region_init_ram_ptr(&s->ivshmem, OBJECT(s), "ivshmem.bar2",
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s->ivshmem_size, ptr);
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@ -358,6 +364,8 @@ static void create_shared_memory_BAR(IVShmemState *s, int fd, uint8_t attr) {
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/* region for shared memory */
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pci_register_bar(PCI_DEVICE(s), 2, attr, &s->bar);
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return 0;
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}
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static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i)
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@ -481,6 +489,7 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
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int incoming_fd;
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int guest_max_eventfd;
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long incoming_posn;
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Error *err = NULL;
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if (!fifo_update_and_get(s, buf, size,
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&incoming_posn, sizeof(incoming_posn))) {
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@ -524,18 +533,24 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
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/* if the position is -1, then it's shared memory region fd */
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if (incoming_posn == -1) {
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void * map_ptr;
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s->max_peer = 0;
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if (check_shm_size(s, incoming_fd) == -1) {
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exit(1);
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if (check_shm_size(s, incoming_fd, &err) == -1) {
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error_report_err(err);
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close(incoming_fd);
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return;
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}
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/* mmap the region and map into the BAR2 */
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map_ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED,
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incoming_fd, 0);
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if (map_ptr == MAP_FAILED) {
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error_report("Failed to mmap shared memory %s", strerror(errno));
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close(incoming_fd);
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return;
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}
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memory_region_init_ram_ptr(&s->ivshmem, OBJECT(s),
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"ivshmem.bar2", s->ivshmem_size, map_ptr);
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vmstate_register_ram(&s->ivshmem, DEVICE(s));
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@ -610,7 +625,7 @@ static void ivshmem_reset(DeviceState *d)
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ivshmem_use_msix(s);
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}
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static uint64_t ivshmem_get_size(IVShmemState * s) {
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static uint64_t ivshmem_get_size(IVShmemState * s, Error **errp) {
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uint64_t value;
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char *ptr;
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@ -624,24 +639,23 @@ static uint64_t ivshmem_get_size(IVShmemState * s) {
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value <<= 30;
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break;
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default:
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error_report("invalid ram size: %s", s->sizearg);
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exit(1);
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error_setg(errp, "invalid ram size: %s", s->sizearg);
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return 0;
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}
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/* BARs must be a power of 2 */
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if (!is_power_of_two(value)) {
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error_report("size must be power of 2");
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exit(1);
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error_setg(errp, "size must be power of 2");
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return 0;
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}
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return value;
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}
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static void ivshmem_setup_msi(IVShmemState * s)
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static int ivshmem_setup_msi(IVShmemState * s)
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{
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if (msix_init_exclusive_bar(PCI_DEVICE(s), s->vectors, 1)) {
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IVSHMEM_DPRINTF("msix initialization failed\n");
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exit(1);
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return -1;
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}
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IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
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@ -650,6 +664,7 @@ static void ivshmem_setup_msi(IVShmemState * s)
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s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry));
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ivshmem_use_msix(s);
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return 0;
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}
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static void ivshmem_save(QEMUFile* f, void *opaque)
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@ -708,29 +723,32 @@ static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address,
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pci_default_write_config(pci_dev, address, val, len);
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}
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static int pci_ivshmem_init(PCIDevice *dev)
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static void pci_ivshmem_realize(PCIDevice *dev, Error **errp)
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{
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IVShmemState *s = IVSHMEM(dev);
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uint8_t *pci_conf;
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uint8_t attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
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PCI_BASE_ADDRESS_MEM_PREFETCH;
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Error *local_err = NULL;
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if (s->sizearg == NULL)
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if (s->sizearg == NULL) {
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s->ivshmem_size = 4 << 20; /* 4 MB default */
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else {
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s->ivshmem_size = ivshmem_get_size(s);
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} else {
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s->ivshmem_size = ivshmem_get_size(s, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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}
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fifo8_create(&s->incoming_fifo, sizeof(long));
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register_savevm(DEVICE(dev), "ivshmem", 0, 0, ivshmem_save, ivshmem_load,
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dev);
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/* IRQFD requires MSI */
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if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
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!ivshmem_has_feature(s, IVSHMEM_MSI)) {
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error_report("ioeventfd/irqfd requires MSI");
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exit(1);
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error_setg(errp, "ioeventfd/irqfd requires MSI");
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return;
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}
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/* check that role is reasonable */
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@ -740,8 +758,8 @@ static int pci_ivshmem_init(PCIDevice *dev)
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} else if (strncmp(s->role, "master", 7) == 0) {
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s->role_val = IVSHMEM_MASTER;
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} else {
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error_report("'role' must be 'peer' or 'master'");
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exit(1);
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error_setg(errp, "'role' must be 'peer' or 'master'");
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return;
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}
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} else {
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s->role_val = IVSHMEM_MASTER; /* default */
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@ -778,15 +796,18 @@ static int pci_ivshmem_init(PCIDevice *dev)
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* to the ivshmem server to receive the memory region */
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if (s->shmobj != NULL) {
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error_report("WARNING: do not specify both 'chardev' "
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error_setg(errp, "do not specify both 'chardev' "
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"and 'shm' with ivshmem");
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return;
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}
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IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
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s->server_chr->filename);
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if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
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ivshmem_setup_msi(s);
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if (ivshmem_has_feature(s, IVSHMEM_MSI) &&
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ivshmem_setup_msi(s)) {
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error_setg(errp, "msix initialization failed");
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return;
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}
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/* we allocate enough space for 16 guests and grow as needed */
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@ -807,8 +828,8 @@ static int pci_ivshmem_init(PCIDevice *dev)
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int fd;
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if (s->shmobj == NULL) {
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error_report("Must specify 'chardev' or 'shm' to ivshmem");
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exit(1);
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error_setg(errp, "Must specify 'chardev' or 'shm' to ivshmem");
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return;
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}
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IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj);
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@ -824,24 +845,19 @@ static int pci_ivshmem_init(PCIDevice *dev)
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} else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR,
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S_IRWXU|S_IRWXG|S_IRWXO)) < 0) {
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error_report("could not open shared file");
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exit(1);
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error_setg(errp, "could not open shared file");
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return;
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}
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if (check_shm_size(s, fd) == -1) {
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exit(1);
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if (check_shm_size(s, fd, errp) == -1) {
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return;
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}
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create_shared_memory_BAR(s, fd, attr);
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create_shared_memory_BAR(s, fd, attr, errp);
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}
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dev->config_write = ivshmem_write_config;
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return 0;
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}
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static void pci_ivshmem_uninit(PCIDevice *dev)
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static void pci_ivshmem_exit(PCIDevice *dev)
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{
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IVShmemState *s = IVSHMEM(dev);
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@ -873,8 +889,9 @@ static void ivshmem_class_init(ObjectClass *klass, void *data)
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DeviceClass *dc = DEVICE_CLASS(klass);
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PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
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k->init = pci_ivshmem_init;
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k->exit = pci_ivshmem_uninit;
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k->realize = pci_ivshmem_realize;
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k->exit = pci_ivshmem_exit;
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k->config_write = ivshmem_write_config;
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k->vendor_id = PCI_VENDOR_ID_IVSHMEM;
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k->device_id = PCI_DEVICE_ID_IVSHMEM;
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k->class_id = PCI_CLASS_MEMORY_RAM;
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