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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>
This commit is contained in:
Marc-André Lureau 2015-06-18 14:59:28 +02:00
parent 49b2951f84
commit d58d7e848e
1 changed files with 68 additions and 51 deletions
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119
hw/misc/ivshmem.c
View File

@ -319,22 +319,23 @@ static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *
}
static int check_shm_size(IVShmemState *s, int fd) {
static int check_shm_size(IVShmemState *s, int fd, Error **errp)
{
/* 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));
error_setg(errp, "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);
error_setg(errp, "Requested memory size greater"
" than shared object size (%" PRIu64 " > %" PRIu64")",
s->ivshmem_size, (uint64_t)buf.st_size);
return -1;
} else {
return 0;
@ -343,13 +344,18 @@ static int check_shm_size(IVShmemState *s, int fd) {
/* 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, uint8_t attr) {
static int create_shared_memory_BAR(IVShmemState *s, int fd, uint8_t attr,
Error **errp)
{
void * ptr;
s->shm_fd = fd;
ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED) {
error_setg_errno(errp, errno, "Failed to mmap shared memory");
return -1;
}
s->shm_fd = fd;
memory_region_init_ram_ptr(&s->ivshmem, OBJECT(s), "ivshmem.bar2",
s->ivshmem_size, ptr);
@ -358,6 +364,8 @@ static void create_shared_memory_BAR(IVShmemState *s, int fd, uint8_t attr) {
/* region for shared memory */
pci_register_bar(PCI_DEVICE(s), 2, attr, &s->bar);
return 0;
}
static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i)
@ -481,6 +489,7 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
int incoming_fd;
int guest_max_eventfd;
long incoming_posn;
Error *err = NULL;
if (!fifo_update_and_get(s, buf, size,
&incoming_posn, sizeof(incoming_posn))) {
@ -524,18 +533,24 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
/* 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);
if (check_shm_size(s, incoming_fd, &err) == -1) {
error_report_err(err);
close(incoming_fd);
return;
}
/* mmap the region and map into the BAR2 */
map_ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED,
incoming_fd, 0);
if (map_ptr == MAP_FAILED) {
error_report("Failed to mmap shared memory %s", strerror(errno));
close(incoming_fd);
return;
}
memory_region_init_ram_ptr(&s->ivshmem, OBJECT(s),
"ivshmem.bar2", s->ivshmem_size, map_ptr);
vmstate_register_ram(&s->ivshmem, DEVICE(s));
@ -610,7 +625,7 @@ static void ivshmem_reset(DeviceState *d)
ivshmem_use_msix(s);
}
static uint64_t ivshmem_get_size(IVShmemState * s) {
static uint64_t ivshmem_get_size(IVShmemState * s, Error **errp) {
uint64_t value;
char *ptr;
@ -624,24 +639,23 @@ static uint64_t ivshmem_get_size(IVShmemState * s) {
value <<= 30;
break;
default:
error_report("invalid ram size: %s", s->sizearg);
exit(1);
error_setg(errp, "invalid ram size: %s", s->sizearg);
return 0;
}
/* BARs must be a power of 2 */
if (!is_power_of_two(value)) {
error_report("size must be power of 2");
exit(1);
error_setg(errp, "size must be power of 2");
return 0;
}
return value;
}
static void ivshmem_setup_msi(IVShmemState * s)
static int ivshmem_setup_msi(IVShmemState * s)
{
if (msix_init_exclusive_bar(PCI_DEVICE(s), s->vectors, 1)) {
IVSHMEM_DPRINTF("msix initialization failed\n");
exit(1);
return -1;
}
IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
@ -650,6 +664,7 @@ static void ivshmem_setup_msi(IVShmemState * s)
s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry));
ivshmem_use_msix(s);
return 0;
}
static void ivshmem_save(QEMUFile* f, void *opaque)
@ -703,34 +718,37 @@ static int ivshmem_load(QEMUFile* f, void *opaque, int version_id)
}
static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address,
uint32_t val, int len)
uint32_t val, int len)
{
pci_default_write_config(pci_dev, address, val, len);
}
static int pci_ivshmem_init(PCIDevice *dev)
static void pci_ivshmem_realize(PCIDevice *dev, Error **errp)
{
IVShmemState *s = IVSHMEM(dev);
uint8_t *pci_conf;
uint8_t attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
PCI_BASE_ADDRESS_MEM_PREFETCH;
Error *local_err = NULL;
if (s->sizearg == NULL)
if (s->sizearg == NULL) {
s->ivshmem_size = 4 << 20; /* 4 MB default */
else {
s->ivshmem_size = ivshmem_get_size(s);
} else {
s->ivshmem_size = ivshmem_get_size(s, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
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);
error_setg(errp, "ioeventfd/irqfd requires MSI");
return;
}
/* check that role is reasonable */
@ -740,8 +758,8 @@ static int pci_ivshmem_init(PCIDevice *dev)
} else if (strncmp(s->role, "master", 7) == 0) {
s->role_val = IVSHMEM_MASTER;
} else {
error_report("'role' must be 'peer' or 'master'");
exit(1);
error_setg(errp, "'role' must be 'peer' or 'master'");
return;
}
} else {
s->role_val = IVSHMEM_MASTER; /* default */
@ -778,15 +796,18 @@ static int pci_ivshmem_init(PCIDevice *dev)
* 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");
error_setg(errp, "do not specify both 'chardev' "
"and 'shm' with ivshmem");
return;
}
IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
s->server_chr->filename);
if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
ivshmem_setup_msi(s);
if (ivshmem_has_feature(s, IVSHMEM_MSI) &&
ivshmem_setup_msi(s)) {
error_setg(errp, "msix initialization failed");
return;
}
/* we allocate enough space for 16 guests and grow as needed */
@ -807,8 +828,8 @@ static int pci_ivshmem_init(PCIDevice *dev)
int fd;
if (s->shmobj == NULL) {
error_report("Must specify 'chardev' or 'shm' to ivshmem");
exit(1);
error_setg(errp, "Must specify 'chardev' or 'shm' to ivshmem");
return;
}
IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj);
@ -824,24 +845,19 @@ static int pci_ivshmem_init(PCIDevice *dev)
} 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);
error_setg(errp, "could not open shared file");
return;
}
if (check_shm_size(s, fd) == -1) {
exit(1);
if (check_shm_size(s, fd, errp) == -1) {
return;
}
create_shared_memory_BAR(s, fd, attr);
create_shared_memory_BAR(s, fd, attr, errp);
}
dev->config_write = ivshmem_write_config;
return 0;
}
static void pci_ivshmem_uninit(PCIDevice *dev)
static void pci_ivshmem_exit(PCIDevice *dev)
{
IVShmemState *s = IVSHMEM(dev);
@ -873,8 +889,9 @@ 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->realize = pci_ivshmem_realize;
k->exit = pci_ivshmem_exit;
k->config_write = ivshmem_write_config;
k->vendor_id = PCI_VENDOR_ID_IVSHMEM;
k->device_id = PCI_DEVICE_ID_IVSHMEM;
k->class_id = PCI_CLASS_MEMORY_RAM;