* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/cutils.h"
#include "hw/hw.h"
#include "hw/i386/pc.h"
#include "hw/pci/pci.h"
+#include "hw/pci/msi.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 "qom/object_interfaces.h"
#include "sysemu/char.h"
+#include "sysemu/hostmem.h"
+#include "sysemu/qtest.h"
+#include "qapi/visitor.h"
+#include "exec/ram_addr.h"
+
+#include "hw/misc/ivshmem.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_MAX_PEERS UINT16_MAX
#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 IVSHMEM_DEBUG 0
+#define IVSHMEM_DPRINTF(fmt, ...) \
+ do { \
+ if (IVSHMEM_DEBUG) { \
+ printf("IVSHMEM: " fmt, ## __VA_ARGS__); \
+ } \
+ } while (0)
+
+#define TYPE_IVSHMEM_COMMON "ivshmem-common"
+#define IVSHMEM_COMMON(obj) \
+ OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM_COMMON)
+
+#define TYPE_IVSHMEM_PLAIN "ivshmem-plain"
+#define IVSHMEM_PLAIN(obj) \
+ OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM_PLAIN)
+
+#define TYPE_IVSHMEM_DOORBELL "ivshmem-doorbell"
+#define IVSHMEM_DOORBELL(obj) \
+ OBJECT_CHECK(IVShmemState, (obj), TYPE_IVSHMEM_DOORBELL)
#define TYPE_IVSHMEM "ivshmem"
#define IVSHMEM(obj) \
EventNotifier *eventfds;
} Peer;
-typedef struct EventfdEntry {
+typedef struct MSIVector {
PCIDevice *pdev;
- int vector;
-} EventfdEntry;
+ int virq;
+} MSIVector;
typedef struct IVShmemState {
/*< private >*/
PCIDevice parent_obj;
/*< public >*/
+ uint32_t features;
+
+ /* exactly one of these two may be set */
+ HostMemoryBackend *hostmem; /* with interrupts */
+ CharDriverState *server_chr; /* without interrupts */
+
+ /* registers */
uint32_t intrmask;
uint32_t intrstatus;
- uint32_t doorbell;
-
- CharDriverState **eventfd_chr;
- CharDriverState *server_chr;
- Fifo8 incoming_fifo;
- MemoryRegion ivshmem_mmio;
+ int vm_id;
- /* 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 */
+ /* BARs */
+ MemoryRegion ivshmem_mmio; /* BAR 0 (registers) */
+ MemoryRegion *ivshmem_bar2; /* BAR 2 (shared memory) */
+ MemoryRegion server_bar2; /* used with server_chr */
+ /* interrupt support */
Peer *peers;
- int nb_peers; /* how many guests we have space for */
- int max_peer; /* maximum numbered peer */
-
- int vm_id;
+ int nb_peers; /* space in @peers[] */
uint32_t vectors;
- uint32_t features;
- EventfdEntry *eventfd_table;
+ MSIVector *msi_vectors;
+ uint64_t msg_buf; /* buffer for receiving server messages */
+ int msg_buffered_bytes; /* #bytes in @msg_buf */
+ /* migration stuff */
+ OnOffAuto master;
Error *migration_blocker;
- char * shmobj;
- char * sizearg;
- char * role;
- int role_val; /* scalar to avoid multiple string comparisons */
+ /* legacy cruft */
+ char *role;
+ char *shmobj;
+ char *sizearg;
+ size_t legacy_size;
+ uint32_t not_legacy_32bit;
} IVShmemState;
/* registers for the Inter-VM shared memory device */
return (ivs->features & (1 << feature));
}
-static inline bool is_power_of_two(uint64_t x) {
- return (x & (x - 1)) == 0;
+static inline bool ivshmem_is_master(IVShmemState *s)
+{
+ assert(s->master != ON_OFF_AUTO_AUTO);
+ return s->master == ON_OFF_AUTO_ON;
}
-/* accessing registers - based on rtl8139 */
-static void ivshmem_update_irq(IVShmemState *s, int val)
+static void ivshmem_update_irq(IVShmemState *s)
{
PCIDevice *d = PCI_DEVICE(s);
- int isr;
- isr = (s->intrstatus & s->intrmask) & 0xffffffff;
+ uint32_t isr = s->intrstatus & s->intrmask;
+
+ /*
+ * Do nothing unless the device actually uses INTx. Here's how
+ * the device variants signal interrupts, what they put in PCI
+ * config space:
+ * Device variant Interrupt Interrupt Pin MSI-X cap.
+ * ivshmem-plain none 0 no
+ * ivshmem-doorbell MSI-X 1 yes(1)
+ * ivshmem,msi=off INTx 1 no
+ * ivshmem,msi=on MSI-X 1(2) yes(1)
+ * (1) if guest enabled MSI-X
+ * (2) the device lies
+ * Leads to the condition for doing nothing:
+ */
+ if (ivshmem_has_feature(s, IVSHMEM_MSI)
+ || !d->config[PCI_INTERRUPT_PIN]) {
+ return;
+ }
/* don't print ISR resets */
if (isr) {
isr ? 1 : 0, s->intrstatus, s->intrmask);
}
- pci_set_irq(d, (isr != 0));
+ 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);
+ ivshmem_update_irq(s);
}
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;
}
IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val);
s->intrstatus = val;
-
- ivshmem_update_irq(s, val);
+ ivshmem_update_irq(s);
}
static uint32_t ivshmem_IntrStatus_read(IVShmemState *s)
/* reading ISR clears all interrupts */
s->intrstatus = 0;
-
- ivshmem_update_irq(s, 0);
-
+ ivshmem_update_irq(s);
return ret;
}
case DOORBELL:
/* check that dest VM ID is reasonable */
- if (dest > s->max_peer) {
+ if (dest >= s->nb_peers) {
IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest);
break;
}
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]);
+ } else {
+ IVSHMEM_DPRINTF("Invalid destination vector %d on VM %d\n",
+ vector, dest);
}
break;
default:
- IVSHMEM_DPRINTF("Invalid VM Doorbell VM %d\n", dest);
+ IVSHMEM_DPRINTF("Unhandled write " TARGET_FMT_plx "\n", addr);
}
}
break;
case IVPOSITION:
- /* return my VM ID if the memory is mapped */
- if (s->shm_fd > 0) {
- ret = s->vm_id;
- } else {
- ret = -1;
- }
+ ret = s->vm_id;
break;
default:
},
};
-static void ivshmem_receive(void *opaque, const uint8_t *buf, int size)
+static void ivshmem_vector_notify(void *opaque)
{
- IVShmemState *s = opaque;
-
- ivshmem_IntrStatus_write(s, *buf);
+ MSIVector *entry = opaque;
+ PCIDevice *pdev = entry->pdev;
+ IVShmemState *s = IVSHMEM_COMMON(pdev);
+ int vector = entry - s->msi_vectors;
+ EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
- IVSHMEM_DPRINTF("ivshmem_receive 0x%02x\n", *buf);
-}
+ if (!event_notifier_test_and_clear(n)) {
+ return;
+ }
-static int ivshmem_can_receive(void * opaque)
-{
- return 8;
+ IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, vector);
+ if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
+ if (msix_enabled(pdev)) {
+ msix_notify(pdev, vector);
+ }
+ } else {
+ ivshmem_IntrStatus_write(s, 1);
+ }
}
-static void ivshmem_event(void *opaque, int event)
+static int ivshmem_vector_unmask(PCIDevice *dev, unsigned vector,
+ MSIMessage msg)
{
- IVSHMEM_DPRINTF("ivshmem_event %d\n", event);
-}
+ IVShmemState *s = IVSHMEM_COMMON(dev);
+ EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
+ MSIVector *v = &s->msi_vectors[vector];
+ int ret;
-static void fake_irqfd(void *opaque, const uint8_t *buf, int size) {
+ IVSHMEM_DPRINTF("vector unmask %p %d\n", dev, vector);
- EventfdEntry *entry = opaque;
- PCIDevice *pdev = entry->pdev;
+ ret = kvm_irqchip_update_msi_route(kvm_state, v->virq, msg, dev);
+ if (ret < 0) {
+ return ret;
+ }
- IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, entry->vector);
- msix_notify(pdev, entry->vector);
+ return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, v->virq);
}
-static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *n,
- int vector)
+static void ivshmem_vector_mask(PCIDevice *dev, unsigned 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);
+ IVShmemState *s = IVSHMEM_COMMON(dev);
+ EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
+ int ret;
- /* 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;
+ IVSHMEM_DPRINTF("vector mask %p %d\n", dev, 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);
+ ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n,
+ s->msi_vectors[vector].virq);
+ if (ret != 0) {
+ error_report("remove_irqfd_notifier_gsi failed");
}
+}
- return chr;
+static void ivshmem_vector_poll(PCIDevice *dev,
+ unsigned int vector_start,
+ unsigned int vector_end)
+{
+ IVShmemState *s = IVSHMEM_COMMON(dev);
+ unsigned int vector;
-}
+ IVSHMEM_DPRINTF("vector poll %p %d-%d\n", dev, vector_start, vector_end);
-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 */
+ vector_end = MIN(vector_end, s->vectors);
- struct stat buf;
+ for (vector = vector_start; vector < vector_end; vector++) {
+ EventNotifier *notifier = &s->peers[s->vm_id].eventfds[vector];
- if (fstat(fd, &buf) < 0) {
- error_report("exiting: fstat on fd %d failed: %s",
- fd, strerror(errno));
- return -1;
- }
+ if (!msix_is_masked(dev, vector)) {
+ continue;
+ }
- 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;
+ if (event_notifier_test_and_clear(notifier)) {
+ msix_set_pending(dev, vector);
+ }
}
}
-/* 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);
+static void watch_vector_notifier(IVShmemState *s, EventNotifier *n,
+ int vector)
+{
+ int eventfd = event_notifier_get_fd(n);
- 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);
+ assert(!s->msi_vectors[vector].pdev);
+ s->msi_vectors[vector].pdev = PCI_DEVICE(s);
- /* region for shared memory */
- pci_register_bar(PCI_DEVICE(s), 2, s->ivshmem_attr, &s->bar);
+ qemu_set_fd_handler(eventfd, ivshmem_vector_notify,
+ NULL, &s->msi_vectors[vector]);
}
static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i)
&s->peers[posn].eventfds[i]);
}
-static void close_guest_eventfds(IVShmemState *s, int posn)
+static void close_peer_eventfds(IVShmemState *s, int posn)
{
- int i, guest_curr_max;
+ int i, n;
- if (!ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
- return;
- }
- if (posn < 0 || posn >= s->nb_peers) {
- return;
- }
+ assert(posn >= 0 && posn < s->nb_peers);
+ n = s->peers[posn].nb_eventfds;
- 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);
+ if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
+ memory_region_transaction_begin();
+ for (i = 0; i < n; i++) {
+ ivshmem_del_eventfd(s, posn, i);
+ }
+ memory_region_transaction_commit();
}
- memory_region_transaction_commit();
- for (i = 0; i < guest_curr_max; i++) {
+
+ for (i = 0; i < n; i++) {
event_notifier_cleanup(&s->peers[posn].eventfds[i]);
}
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)
+static void resize_peers(IVShmemState *s, int nb_peers)
{
+ int old_nb_peers = s->nb_peers;
+ int i;
- int j, old_nb_alloc;
-
- /* check for integer overflow */
- if (new_min_size >= INT_MAX / sizeof(Peer) - 1 || new_min_size <= 0) {
- return -1;
- }
+ assert(nb_peers > old_nb_peers);
+ IVSHMEM_DPRINTF("bumping storage to %d peers\n", nb_peers);
- old_nb_alloc = s->nb_peers;
+ s->peers = g_realloc(s->peers, nb_peers * sizeof(Peer));
+ s->nb_peers = 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;
+ for (i = old_nb_peers; i < nb_peers; i++) {
+ s->peers[i].eventfds = g_new0(EventNotifier, s->vectors);
+ s->peers[i].nb_eventfds = 0;
}
+}
- IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers);
- s->peers = g_realloc(s->peers, s->nb_peers * sizeof(Peer));
+static void ivshmem_add_kvm_msi_virq(IVShmemState *s, int vector,
+ Error **errp)
+{
+ PCIDevice *pdev = PCI_DEVICE(s);
+ MSIMessage msg = msix_get_message(pdev, vector);
+ int ret;
- /* 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;
+ IVSHMEM_DPRINTF("ivshmem_add_kvm_msi_virq vector:%d\n", vector);
+ assert(!s->msi_vectors[vector].pdev);
+
+ ret = kvm_irqchip_add_msi_route(kvm_state, msg, pdev);
+ if (ret < 0) {
+ error_setg(errp, "kvm_irqchip_add_msi_route failed");
+ return;
}
- return 0;
+ s->msi_vectors[vector].virq = ret;
+ s->msi_vectors[vector].pdev = pdev;
}
-static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
+static void setup_interrupt(IVShmemState *s, int vector, Error **errp)
{
- 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)) {
+ EventNotifier *n = &s->peers[s->vm_id].eventfds[vector];
+ bool with_irqfd = kvm_msi_via_irqfd_enabled() &&
+ ivshmem_has_feature(s, IVSHMEM_MSI);
+ PCIDevice *pdev = PCI_DEVICE(s);
+ Error *err = NULL;
+
+ IVSHMEM_DPRINTF("setting up interrupt for vector: %d\n", vector);
+
+ if (!with_irqfd) {
+ IVSHMEM_DPRINTF("with eventfd\n");
+ watch_vector_notifier(s, n, vector);
+ } else if (msix_enabled(pdev)) {
+ IVSHMEM_DPRINTF("with irqfd\n");
+ ivshmem_add_kvm_msi_virq(s, vector, &err);
+ if (err) {
+ error_propagate(errp, err);
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 (!msix_is_masked(pdev, vector)) {
+ kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL,
+ s->msi_vectors[vector].virq);
+ /* TODO handle error */
}
+ } else {
+ /* it will be delayed until msix is enabled, in write_config */
+ IVSHMEM_DPRINTF("with irqfd, delayed until msix enabled\n");
}
+}
- if (incoming_posn < -1) {
- IVSHMEM_DPRINTF("invalid incoming_posn %ld\n", incoming_posn);
+static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
+{
+ struct stat buf;
+ size_t size;
+ void *ptr;
+
+ if (s->ivshmem_bar2) {
+ error_setg(errp, "server sent unexpected shared memory message");
+ close(fd);
+ return;
+ }
+
+ if (fstat(fd, &buf) < 0) {
+ error_setg_errno(errp, errno,
+ "can't determine size of shared memory sent by server");
+ close(fd);
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);
+ size = buf.st_size;
- /* 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);
- }
+ /* Legacy cruft */
+ if (s->legacy_size != SIZE_MAX) {
+ if (size < s->legacy_size) {
+ error_setg(errp, "server sent only %zd bytes of shared memory",
+ (size_t)buf.st_size);
+ close(fd);
return;
}
+ size = s->legacy_size;
}
- 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;
- }
+ /* mmap the region and map into the BAR2 */
+ ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ if (ptr == MAP_FAILED) {
+ error_setg_errno(errp, errno, "Failed to mmap shared memory");
+ close(fd);
+ return;
}
+ memory_region_init_ram_ptr(&s->server_bar2, OBJECT(s),
+ "ivshmem.bar2", size, ptr);
+ qemu_set_ram_fd(memory_region_get_ram_addr(&s->server_bar2), fd);
+ s->ivshmem_bar2 = &s->server_bar2;
+}
- /* because of the implementation of get_msgfd, we need a dup */
- incoming_fd = dup(tmp_fd);
+static void process_msg_disconnect(IVShmemState *s, uint16_t posn,
+ Error **errp)
+{
+ IVSHMEM_DPRINTF("posn %d has gone away\n", posn);
+ if (posn >= s->nb_peers || posn == s->vm_id) {
+ error_setg(errp, "invalid peer %d", posn);
+ return;
+ }
+ close_peer_eventfds(s, posn);
+}
- if (incoming_fd == -1) {
- error_report("could not allocate file descriptor %s", strerror(errno));
- close(tmp_fd);
+static void process_msg_connect(IVShmemState *s, uint16_t posn, int fd,
+ Error **errp)
+{
+ Peer *peer = &s->peers[posn];
+ int vector;
+
+ /*
+ * The N-th connect message for this peer comes with the file
+ * descriptor for vector N-1. Count messages to find the vector.
+ */
+ if (peer->nb_eventfds >= s->vectors) {
+ error_setg(errp, "Too many eventfd received, device has %d vectors",
+ s->vectors);
+ close(fd);
return;
}
+ vector = peer->nb_eventfds++;
+
+ IVSHMEM_DPRINTF("eventfds[%d][%d] = %d\n", posn, vector, fd);
+ event_notifier_init_fd(&peer->eventfds[vector], fd);
+ fcntl_setfl(fd, O_NONBLOCK); /* msix/irqfd poll non block */
+
+ if (posn == s->vm_id) {
+ setup_interrupt(s, vector, errp);
+ /* TODO do we need to handle the error? */
+ }
- /* if the position is -1, then it's shared memory region fd */
- if (incoming_posn == -1) {
+ if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
+ ivshmem_add_eventfd(s, posn, vector);
+ }
+}
- void * map_ptr;
+static void process_msg(IVShmemState *s, int64_t msg, int fd, Error **errp)
+{
+ IVSHMEM_DPRINTF("posn is %" PRId64 ", fd is %d\n", msg, fd);
- s->max_peer = 0;
+ if (msg < -1 || msg > IVSHMEM_MAX_PEERS) {
+ error_setg(errp, "server sent invalid message %" PRId64, msg);
+ close(fd);
+ return;
+ }
- if (check_shm_size(s, incoming_fd) == -1) {
- exit(1);
- }
+ if (msg == -1) {
+ process_msg_shmem(s, fd, errp);
+ 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);
- memory_region_init_ram_ptr(&s->ivshmem, OBJECT(s),
- "ivshmem.bar2", s->ivshmem_size, map_ptr);
- vmstate_register_ram(&s->ivshmem, DEVICE(s));
+ if (msg >= s->nb_peers) {
+ resize_peers(s, msg + 1);
+ }
- IVSHMEM_DPRINTF("guest h/w addr = %p, size = %" PRIu64 "\n",
- map_ptr, s->ivshmem_size);
+ if (fd >= 0) {
+ process_msg_connect(s, msg, fd, errp);
+ } else {
+ process_msg_disconnect(s, msg, errp);
+ }
+}
- memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
+static int ivshmem_can_receive(void *opaque)
+{
+ IVShmemState *s = opaque;
- /* only store the fd if it is successfully mapped */
- s->shm_fd = incoming_fd;
+ assert(s->msg_buffered_bytes < sizeof(s->msg_buf));
+ return sizeof(s->msg_buf) - s->msg_buffered_bytes;
+}
+static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
+{
+ IVShmemState *s = opaque;
+ Error *err = NULL;
+ int fd;
+ int64_t msg;
+
+ assert(size >= 0 && s->msg_buffered_bytes + size <= sizeof(s->msg_buf));
+ memcpy((unsigned char *)&s->msg_buf + s->msg_buffered_bytes, buf, size);
+ s->msg_buffered_bytes += size;
+ if (s->msg_buffered_bytes < sizeof(s->msg_buf)) {
return;
}
+ msg = le64_to_cpu(s->msg_buf);
+ s->msg_buffered_bytes = 0;
- /* 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;
+ fd = qemu_chr_fe_get_msgfd(s->server_chr);
+ IVSHMEM_DPRINTF("posn is %" PRId64 ", fd is %d\n", msg, fd);
- if (guest_max_eventfd == 0) {
- /* one eventfd per MSI vector */
- s->peers[incoming_posn].eventfds = g_new(EventNotifier, s->vectors);
+ process_msg(s, msg, fd, &err);
+ if (err) {
+ error_report_err(err);
}
+}
- /* 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);
+static int64_t ivshmem_recv_msg(IVShmemState *s, int *pfd, Error **errp)
+{
+ int64_t msg;
+ int n, ret;
+
+ n = 0;
+ do {
+ ret = qemu_chr_fe_read_all(s->server_chr, (uint8_t *)&msg + n,
+ sizeof(msg) - n);
+ if (ret < 0 && ret != -EINTR) {
+ error_setg_errno(errp, -ret, "read from server failed");
+ return INT64_MIN;
+ }
+ n += ret;
+ } while (n < sizeof(msg));
- /* increment count for particular guest */
- s->peers[incoming_posn].nb_eventfds++;
+ *pfd = qemu_chr_fe_get_msgfd(s->server_chr);
+ return msg;
+}
- /* keep track of the maximum VM ID */
- if (incoming_posn > s->max_peer) {
- s->max_peer = incoming_posn;
- }
+static void ivshmem_recv_setup(IVShmemState *s, Error **errp)
+{
+ Error *err = NULL;
+ int64_t msg;
+ int fd;
- 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);
+ msg = ivshmem_recv_msg(s, &fd, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+ if (msg != IVSHMEM_PROTOCOL_VERSION) {
+ error_setg(errp, "server sent version %" PRId64 ", expecting %d",
+ msg, IVSHMEM_PROTOCOL_VERSION);
+ return;
+ }
+ if (fd != -1) {
+ error_setg(errp, "server sent invalid version message");
+ return;
}
- if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
- ivshmem_add_eventfd(s, incoming_posn, guest_max_eventfd);
+ /*
+ * ivshmem-server sends the remaining initial messages in a fixed
+ * order, but the device has always accepted them in any order.
+ * Stay as compatible as practical, just in case people use
+ * servers that behave differently.
+ */
+
+ /*
+ * ivshmem_device_spec.txt has always required the ID message
+ * right here, and ivshmem-server has always complied. However,
+ * older versions of the device accepted it out of order, but
+ * broke when an interrupt setup message arrived before it.
+ */
+ msg = ivshmem_recv_msg(s, &fd, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+ if (fd != -1 || msg < 0 || msg > IVSHMEM_MAX_PEERS) {
+ error_setg(errp, "server sent invalid ID message");
+ return;
}
+ s->vm_id = msg;
+
+ /*
+ * Receive more messages until we got shared memory.
+ */
+ do {
+ msg = ivshmem_recv_msg(s, &fd, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+ process_msg(s, msg, fd, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+ } while (msg != -1);
+
+ /*
+ * This function must either map the shared memory or fail. The
+ * loop above ensures that: it terminates normally only after it
+ * successfully processed the server's shared memory message.
+ * Assert that actually mapped the shared memory:
+ */
+ assert(s->ivshmem_bar2);
}
/* 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)
+static void ivshmem_msix_vector_use(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);
+ IVShmemState *s = IVSHMEM_COMMON(d);
s->intrstatus = 0;
- ivshmem_use_msix(s);
+ s->intrmask = 0;
+ if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
+ ivshmem_msix_vector_use(s);
+ }
}
-static uint64_t ivshmem_get_size(IVShmemState * s) {
+static int ivshmem_setup_interrupts(IVShmemState *s)
+{
+ /* allocate QEMU callback data for receiving interrupts */
+ s->msi_vectors = g_malloc0(s->vectors * sizeof(MSIVector));
- uint64_t value;
- char *ptr;
+ if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
+ if (msix_init_exclusive_bar(PCI_DEVICE(s), s->vectors, 1)) {
+ return -1;
+ }
- 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);
+ IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
+ ivshmem_msix_vector_use(s);
}
- /* BARs must be a power of 2 */
- if (!is_power_of_two(value)) {
- error_report("size must be power of 2");
- exit(1);
+ return 0;
+}
+
+static void ivshmem_enable_irqfd(IVShmemState *s)
+{
+ PCIDevice *pdev = PCI_DEVICE(s);
+ int i;
+
+ for (i = 0; i < s->peers[s->vm_id].nb_eventfds; i++) {
+ Error *err = NULL;
+
+ ivshmem_add_kvm_msi_virq(s, i, &err);
+ if (err) {
+ error_report_err(err);
+ /* TODO do we need to handle the error? */
+ }
}
- return value;
+ if (msix_set_vector_notifiers(pdev,
+ ivshmem_vector_unmask,
+ ivshmem_vector_mask,
+ ivshmem_vector_poll)) {
+ error_report("ivshmem: msix_set_vector_notifiers failed");
+ }
}
-static void ivshmem_setup_msi(IVShmemState * s)
+static void ivshmem_remove_kvm_msi_virq(IVShmemState *s, int vector)
{
- if (msix_init_exclusive_bar(PCI_DEVICE(s), s->vectors, 1)) {
- IVSHMEM_DPRINTF("msix initialization failed\n");
- exit(1);
- }
+ IVSHMEM_DPRINTF("ivshmem_remove_kvm_msi_virq vector:%d\n", vector);
- IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
+ if (s->msi_vectors[vector].pdev == NULL) {
+ return;
+ }
- /* allocate QEMU char devices for receiving interrupts */
- s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry));
+ /* it was cleaned when masked in the frontend. */
+ kvm_irqchip_release_virq(kvm_state, s->msi_vectors[vector].virq);
- ivshmem_use_msix(s);
+ s->msi_vectors[vector].pdev = NULL;
}
-static void ivshmem_save(QEMUFile* f, void *opaque)
+static void ivshmem_disable_irqfd(IVShmemState *s)
{
- IVShmemState *proxy = opaque;
- PCIDevice *pci_dev = PCI_DEVICE(proxy);
-
- IVSHMEM_DPRINTF("ivshmem_save\n");
- pci_device_save(pci_dev, f);
+ PCIDevice *pdev = PCI_DEVICE(s);
+ int i;
- 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);
+ for (i = 0; i < s->peers[s->vm_id].nb_eventfds; i++) {
+ ivshmem_remove_kvm_msi_virq(s, i);
}
+ msix_unset_vector_notifiers(pdev);
}
-static int ivshmem_load(QEMUFile* f, void *opaque, int version_id)
+static void ivshmem_write_config(PCIDevice *pdev, uint32_t address,
+ uint32_t val, int len)
{
- IVSHMEM_DPRINTF("ivshmem_load\n");
+ IVShmemState *s = IVSHMEM_COMMON(pdev);
+ int is_enabled, was_enabled = msix_enabled(pdev);
- IVShmemState *proxy = opaque;
- PCIDevice *pci_dev = PCI_DEVICE(proxy);
- int ret;
+ pci_default_write_config(pdev, address, val, len);
+ is_enabled = msix_enabled(pdev);
- if (version_id > 0) {
- return -EINVAL;
+ if (kvm_msi_via_irqfd_enabled()) {
+ if (!was_enabled && is_enabled) {
+ ivshmem_enable_irqfd(s);
+ } else if (was_enabled && !is_enabled) {
+ ivshmem_disable_irqfd(s);
+ }
}
+}
- if (proxy->role_val == IVSHMEM_PEER) {
- error_report("'peer' devices are not migratable");
- return -EINVAL;
+static void ivshmem_common_realize(PCIDevice *dev, Error **errp)
+{
+ IVShmemState *s = IVSHMEM_COMMON(dev);
+ Error *err = NULL;
+ uint8_t *pci_conf;
+ uint8_t attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
+ PCI_BASE_ADDRESS_MEM_PREFETCH;
+
+ /* IRQFD requires MSI */
+ if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
+ !ivshmem_has_feature(s, IVSHMEM_MSI)) {
+ error_setg(errp, "ioeventfd/irqfd requires MSI");
+ return;
}
- ret = pci_device_load(pci_dev, f);
- if (ret) {
- return ret;
+ pci_conf = dev->config;
+ pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
+
+ 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);
+
+ if (!s->not_legacy_32bit) {
+ attr |= PCI_BASE_ADDRESS_MEM_TYPE_64;
}
- if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
- msix_load(pci_dev, f);
- ivshmem_use_msix(proxy);
+ if (s->hostmem != NULL) {
+ IVSHMEM_DPRINTF("using hostmem\n");
+
+ s->ivshmem_bar2 = host_memory_backend_get_memory(s->hostmem,
+ &error_abort);
} else {
- proxy->intrstatus = qemu_get_be32(f);
- proxy->intrmask = qemu_get_be32(f);
+ assert(s->server_chr);
+
+ IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
+ s->server_chr->filename);
+
+ /* we allocate enough space for 16 peers and grow as needed */
+ resize_peers(s, 16);
+
+ /*
+ * Receive setup messages from server synchronously.
+ * Older versions did it asynchronously, but that creates a
+ * number of entertaining race conditions.
+ */
+ ivshmem_recv_setup(s, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+
+ if (s->master == ON_OFF_AUTO_ON && s->vm_id != 0) {
+ error_setg(errp,
+ "master must connect to the server before any peers");
+ return;
+ }
+
+ qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive,
+ ivshmem_read, NULL, s);
+
+ if (ivshmem_setup_interrupts(s) < 0) {
+ error_setg(errp, "failed to initialize interrupts");
+ return;
+ }
}
- return 0;
-}
+ vmstate_register_ram(s->ivshmem_bar2, DEVICE(s));
+ pci_register_bar(PCI_DEVICE(s), 2, attr, s->ivshmem_bar2);
-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);
+ if (s->master == ON_OFF_AUTO_AUTO) {
+ s->master = s->vm_id == 0 ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
+ }
+
+ if (!ivshmem_is_master(s)) {
+ error_setg(&s->migration_blocker,
+ "Migration is disabled when using feature 'peer mode' in device 'ivshmem'");
+ migrate_add_blocker(s->migration_blocker);
+ }
}
-static int pci_ivshmem_init(PCIDevice *dev)
+static void ivshmem_exit(PCIDevice *dev)
{
- IVShmemState *s = IVSHMEM(dev);
- uint8_t *pci_conf;
+ IVShmemState *s = IVSHMEM_COMMON(dev);
+ int i;
- if (s->sizearg == NULL)
- s->ivshmem_size = 4 << 20; /* 4 MB default */
- else {
- s->ivshmem_size = ivshmem_get_size(s);
+ if (s->migration_blocker) {
+ migrate_del_blocker(s->migration_blocker);
+ error_free(s->migration_blocker);
}
- fifo8_create(&s->incoming_fifo, sizeof(long));
+ if (memory_region_is_mapped(s->ivshmem_bar2)) {
+ if (!s->hostmem) {
+ void *addr = memory_region_get_ram_ptr(s->ivshmem_bar2);
+ int fd;
- register_savevm(DEVICE(dev), "ivshmem", 0, 0, ivshmem_save, ivshmem_load,
- dev);
+ if (munmap(addr, memory_region_size(s->ivshmem_bar2) == -1)) {
+ error_report("Failed to munmap shared memory %s",
+ strerror(errno));
+ }
- /* IRQFD requires MSI */
- if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
- !ivshmem_has_feature(s, IVSHMEM_MSI)) {
- error_report("ioeventfd/irqfd requires MSI");
- exit(1);
+ fd = qemu_get_ram_fd(memory_region_get_ram_addr(s->ivshmem_bar2));
+ close(fd);
+ }
+
+ vmstate_unregister_ram(s->ivshmem_bar2, DEVICE(dev));
}
- /* 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);
+ if (s->peers) {
+ for (i = 0; i < s->nb_peers; i++) {
+ close_peer_eventfds(s, i);
}
- } else {
- s->role_val = IVSHMEM_MASTER; /* default */
+ g_free(s->peers);
}
- 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);
+ if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
+ msix_uninit_exclusive_bar(dev);
}
- pci_conf = dev->config;
- pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
+ g_free(s->msi_vectors);
+}
- pci_config_set_interrupt_pin(pci_conf, 1);
+static int ivshmem_pre_load(void *opaque)
+{
+ IVShmemState *s = opaque;
- s->shm_fd = 0;
+ if (!ivshmem_is_master(s)) {
+ error_report("'peer' devices are not migratable");
+ return -EINVAL;
+ }
- memory_region_init_io(&s->ivshmem_mmio, OBJECT(s), &ivshmem_mmio_ops, s,
- "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE);
+ return 0;
+}
- /* region for registers*/
- pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY,
- &s->ivshmem_mmio);
+static int ivshmem_post_load(void *opaque, int version_id)
+{
+ IVShmemState *s = opaque;
- 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 (ivshmem_has_feature(s, IVSHMEM_MSI)) {
+ ivshmem_msix_vector_use(s);
}
+ return 0;
+}
- 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 */
+static void ivshmem_common_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
- if (s->shmobj != NULL) {
- error_report("WARNING: do not specify both 'chardev' "
- "and 'shm' with ivshmem");
- }
+ k->realize = ivshmem_common_realize;
+ k->exit = 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;
+ k->revision = 1;
+ dc->reset = ivshmem_reset;
+ set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+ dc->desc = "Inter-VM shared memory";
+}
- IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
- s->server_chr->filename);
+static const TypeInfo ivshmem_common_info = {
+ .name = TYPE_IVSHMEM_COMMON,
+ .parent = TYPE_PCI_DEVICE,
+ .instance_size = sizeof(IVShmemState),
+ .abstract = true,
+ .class_init = ivshmem_common_class_init,
+};
- if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
- ivshmem_setup_msi(s);
- }
+static void ivshmem_check_memdev_is_busy(Object *obj, const char *name,
+ Object *val, Error **errp)
+{
+ MemoryRegion *mr;
- /* we allocate enough space for 16 guests and grow as needed */
- s->nb_peers = 16;
- s->vm_id = -1;
+ mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), &error_abort);
+ if (memory_region_is_mapped(mr)) {
+ char *path = object_get_canonical_path_component(val);
+ error_setg(errp, "can't use already busy memdev: %s", path);
+ g_free(path);
+ } else {
+ qdev_prop_allow_set_link_before_realize(obj, name, val, errp);
+ }
+}
+
+static const VMStateDescription ivshmem_plain_vmsd = {
+ .name = TYPE_IVSHMEM_PLAIN,
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .pre_load = ivshmem_pre_load,
+ .post_load = ivshmem_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_PCI_DEVICE(parent_obj, IVShmemState),
+ VMSTATE_UINT32(intrstatus, IVShmemState),
+ VMSTATE_UINT32(intrmask, IVShmemState),
+ VMSTATE_END_OF_LIST()
+ },
+};
- /* allocate/initialize space for interrupt handling */
- s->peers = g_malloc0(s->nb_peers * sizeof(Peer));
+static Property ivshmem_plain_properties[] = {
+ DEFINE_PROP_ON_OFF_AUTO("master", IVShmemState, master, ON_OFF_AUTO_OFF),
+ DEFINE_PROP_END_OF_LIST(),
+};
- pci_register_bar(dev, 2, s->ivshmem_attr, &s->bar);
+static void ivshmem_plain_init(Object *obj)
+{
+ IVShmemState *s = IVSHMEM_PLAIN(obj);
- s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *));
+ object_property_add_link(obj, "memdev", TYPE_MEMORY_BACKEND,
+ (Object **)&s->hostmem,
+ ivshmem_check_memdev_is_busy,
+ OBJ_PROP_LINK_UNREF_ON_RELEASE,
+ &error_abort);
+}
- 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;
+static void ivshmem_plain_realize(PCIDevice *dev, Error **errp)
+{
+ IVShmemState *s = IVSHMEM_COMMON(dev);
- if (s->shmobj == NULL) {
- error_report("Must specify 'chardev' or 'shm' to ivshmem");
- exit(1);
- }
+ if (!s->hostmem) {
+ error_setg(errp, "You must specify a 'memdev'");
+ return;
+ }
- IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj);
+ ivshmem_common_realize(dev, errp);
+}
- /* 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");
- }
+static void ivshmem_plain_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
- } 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);
+ k->realize = ivshmem_plain_realize;
+ dc->props = ivshmem_plain_properties;
+ dc->vmsd = &ivshmem_plain_vmsd;
+}
- }
+static const TypeInfo ivshmem_plain_info = {
+ .name = TYPE_IVSHMEM_PLAIN,
+ .parent = TYPE_IVSHMEM_COMMON,
+ .instance_size = sizeof(IVShmemState),
+ .instance_init = ivshmem_plain_init,
+ .class_init = ivshmem_plain_class_init,
+};
- if (check_shm_size(s, fd) == -1) {
- exit(1);
- }
+static const VMStateDescription ivshmem_doorbell_vmsd = {
+ .name = TYPE_IVSHMEM_DOORBELL,
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .pre_load = ivshmem_pre_load,
+ .post_load = ivshmem_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_PCI_DEVICE(parent_obj, IVShmemState),
+ VMSTATE_MSIX(parent_obj, IVShmemState),
+ VMSTATE_UINT32(intrstatus, IVShmemState),
+ VMSTATE_UINT32(intrmask, IVShmemState),
+ VMSTATE_END_OF_LIST()
+ },
+};
- create_shared_memory_BAR(s, fd);
+static Property ivshmem_doorbell_properties[] = {
+ DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
+ DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
+ DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD,
+ true),
+ DEFINE_PROP_ON_OFF_AUTO("master", IVShmemState, master, ON_OFF_AUTO_OFF),
+ DEFINE_PROP_END_OF_LIST(),
+};
+static void ivshmem_doorbell_init(Object *obj)
+{
+ IVShmemState *s = IVSHMEM_DOORBELL(obj);
+
+ s->features |= (1 << IVSHMEM_MSI);
+ s->legacy_size = SIZE_MAX; /* whatever the server sends */
+}
+
+static void ivshmem_doorbell_realize(PCIDevice *dev, Error **errp)
+{
+ IVShmemState *s = IVSHMEM_COMMON(dev);
+
+ if (!s->server_chr) {
+ error_setg(errp, "You must specify a 'chardev'");
+ return;
}
- dev->config_write = ivshmem_write_config;
+ ivshmem_common_realize(dev, errp);
+}
- return 0;
+static void ivshmem_doorbell_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+ k->realize = ivshmem_doorbell_realize;
+ dc->props = ivshmem_doorbell_properties;
+ dc->vmsd = &ivshmem_doorbell_vmsd;
}
-static void pci_ivshmem_uninit(PCIDevice *dev)
+static const TypeInfo ivshmem_doorbell_info = {
+ .name = TYPE_IVSHMEM_DOORBELL,
+ .parent = TYPE_IVSHMEM_COMMON,
+ .instance_size = sizeof(IVShmemState),
+ .instance_init = ivshmem_doorbell_init,
+ .class_init = ivshmem_doorbell_class_init,
+};
+
+static int ivshmem_load_old(QEMUFile *f, void *opaque, int version_id)
{
- IVShmemState *s = IVSHMEM(dev);
+ IVShmemState *s = opaque;
+ PCIDevice *pdev = PCI_DEVICE(s);
+ int ret;
- if (s->migration_blocker) {
- migrate_del_blocker(s->migration_blocker);
- error_free(s->migration_blocker);
+ IVSHMEM_DPRINTF("ivshmem_load_old\n");
+
+ if (version_id != 0) {
+ return -EINVAL;
+ }
+
+ ret = ivshmem_pre_load(s);
+ if (ret) {
+ return ret;
+ }
+
+ ret = pci_device_load(pdev, f);
+ if (ret) {
+ return ret;
+ }
+
+ if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
+ msix_load(pdev, f);
+ ivshmem_msix_vector_use(s);
+ } else {
+ s->intrstatus = qemu_get_be32(f);
+ s->intrmask = qemu_get_be32(f);
}
- 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);
+ return 0;
}
+static bool test_msix(void *opaque, int version_id)
+{
+ IVShmemState *s = opaque;
+
+ return ivshmem_has_feature(s, IVSHMEM_MSI);
+}
+
+static bool test_no_msix(void *opaque, int version_id)
+{
+ return !test_msix(opaque, version_id);
+}
+
+static const VMStateDescription ivshmem_vmsd = {
+ .name = "ivshmem",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .pre_load = ivshmem_pre_load,
+ .post_load = ivshmem_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_PCI_DEVICE(parent_obj, IVShmemState),
+
+ VMSTATE_MSIX_TEST(parent_obj, IVShmemState, test_msix),
+ VMSTATE_UINT32_TEST(intrstatus, IVShmemState, test_no_msix),
+ VMSTATE_UINT32_TEST(intrmask, IVShmemState, test_no_msix),
+
+ VMSTATE_END_OF_LIST()
+ },
+ .load_state_old = ivshmem_load_old,
+ .minimum_version_id_old = 0
+};
+
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("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_UINT32("use64", IVShmemState, not_legacy_32bit, 1),
DEFINE_PROP_END_OF_LIST(),
};
+static void desugar_shm(IVShmemState *s)
+{
+ Object *obj;
+ char *path;
+
+ obj = object_new("memory-backend-file");
+ path = g_strdup_printf("/dev/shm/%s", s->shmobj);
+ object_property_set_str(obj, path, "mem-path", &error_abort);
+ g_free(path);
+ object_property_set_int(obj, s->legacy_size, "size", &error_abort);
+ object_property_set_bool(obj, true, "share", &error_abort);
+ object_property_add_child(OBJECT(s), "internal-shm-backend", obj,
+ &error_abort);
+ user_creatable_complete(obj, &error_abort);
+ s->hostmem = MEMORY_BACKEND(obj);
+}
+
+static void ivshmem_realize(PCIDevice *dev, Error **errp)
+{
+ IVShmemState *s = IVSHMEM_COMMON(dev);
+
+ if (!qtest_enabled()) {
+ error_report("ivshmem is deprecated, please use ivshmem-plain"
+ " or ivshmem-doorbell instead");
+ }
+
+ if (!!s->server_chr + !!s->shmobj != 1) {
+ error_setg(errp, "You must specify either 'shm' or 'chardev'");
+ return;
+ }
+
+ if (s->sizearg == NULL) {
+ s->legacy_size = 4 << 20; /* 4 MB default */
+ } else {
+ char *end;
+ int64_t size = qemu_strtosz(s->sizearg, &end);
+ if (size < 0 || (size_t)size != size || *end != '\0'
+ || !is_power_of_2(size)) {
+ error_setg(errp, "Invalid size %s", s->sizearg);
+ return;
+ }
+ s->legacy_size = size;
+ }
+
+ /* check that role is reasonable */
+ if (s->role) {
+ if (strncmp(s->role, "peer", 5) == 0) {
+ s->master = ON_OFF_AUTO_OFF;
+ } else if (strncmp(s->role, "master", 7) == 0) {
+ s->master = ON_OFF_AUTO_ON;
+ } else {
+ error_setg(errp, "'role' must be 'peer' or 'master'");
+ return;
+ }
+ } else {
+ s->master = ON_OFF_AUTO_AUTO;
+ }
+
+ if (s->shmobj) {
+ desugar_shm(s);
+ }
+
+ /*
+ * Note: we don't use INTx with IVSHMEM_MSI at all, so this is a
+ * bald-faced lie then. But it's a backwards compatible lie.
+ */
+ pci_config_set_interrupt_pin(dev->config, 1);
+
+ ivshmem_common_realize(dev, errp);
+}
+
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;
+ k->realize = ivshmem_realize;
+ k->revision = 0;
+ dc->desc = "Inter-VM shared memory (legacy)";
dc->props = ivshmem_properties;
- set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+ dc->vmsd = &ivshmem_vmsd;
}
static const TypeInfo ivshmem_info = {
.name = TYPE_IVSHMEM,
- .parent = TYPE_PCI_DEVICE,
+ .parent = TYPE_IVSHMEM_COMMON,
.instance_size = sizeof(IVShmemState),
.class_init = ivshmem_class_init,
};
static void ivshmem_register_types(void)
{
+ type_register_static(&ivshmem_common_info);
+ type_register_static(&ivshmem_plain_info);
+ type_register_static(&ivshmem_doorbell_info);
type_register_static(&ivshmem_info);
}
Code Review / kvmfornfv.git / blobdiff