ivshmem_realize() puts the shared memory region in a container region.
Used to be necessary to permit delayed mapping of the shared memory.
However, we recently moved to synchronous mapping, in "ivshmem:
Receive shared memory synchronously in realize()" and the commit
following it. The container is redundant since then. Drop it.
Signed-off-by: Markus Armbruster <arm...@redhat.com>
---
hw/misc/ivshmem.c | 45 ++++++++++++++++-----------------------------
1 file changed, 16 insertions(+), 29 deletions(-)
diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index 747f9c3..6a52a62 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -82,12 +82,8 @@ typedef struct IVShmemState {
CharDriverState *server_chr;
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;
+ MemoryRegion *ivshmem_bar2; /* BAR 2 (shared memory) */
+ MemoryRegion server_bar2; /* used with server_chr */
size_t ivshmem_size; /* size of shared memory region */
uint32_t ivshmem_64bit;
@@ -487,7 +483,7 @@ static void process_msg_shmem(IVShmemState *s, int fd,
Error **errp)
Error *err = NULL;
void *ptr;
- if (memory_region_is_mapped(&s->ivshmem)) {
+ if (s->ivshmem_bar2) {
error_setg(errp, "server sent unexpected shared memory message");
close(fd);
return;
@@ -506,11 +502,10 @@ static void process_msg_shmem(IVShmemState *s, int fd,
Error **errp)
close(fd);
return;
}
- memory_region_init_ram_ptr(&s->ivshmem, OBJECT(s),
+ memory_region_init_ram_ptr(&s->server_bar2, OBJECT(s),
"ivshmem.bar2", s->ivshmem_size, ptr);
- qemu_set_ram_fd(s->ivshmem.ram_addr, fd);
- vmstate_register_ram(&s->ivshmem, DEVICE(s));
- memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
+ qemu_set_ram_fd(s->server_bar2.ram_addr, fd);
+ s->ivshmem_bar2 = &s->server_bar2;
}
static void process_msg_disconnect(IVShmemState *s, uint16_t posn,
@@ -696,7 +691,7 @@ static void ivshmem_recv_setup(IVShmemState *s, Error
**errp)
}
} while (msg != -1);
- assert(memory_region_is_mapped(&s->ivshmem));
+ assert(s->ivshmem_bar2);
}
/* Select the MSI-X vectors used by device.
@@ -899,7 +894,6 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error
**errp)
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);
if (s->ivshmem_64bit) {
attr |= PCI_BASE_ADDRESS_MEM_TYPE_64;
}
@@ -909,15 +903,10 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error
**errp)
}
if (s->hostmem != NULL) {
- MemoryRegion *mr;
-
IVSHMEM_DPRINTF("using hostmem\n");
- mr = host_memory_backend_get_memory(MEMORY_BACKEND(s->hostmem),
- &error_abort);
- vmstate_register_ram(mr, DEVICE(s));
- memory_region_add_subregion(&s->bar, 0, mr);
- pci_register_bar(PCI_DEVICE(s), 2, attr, &s->bar);
+ s->ivshmem_bar2 = host_memory_backend_get_memory(s->hostmem,
+ &error_abort);
} else {
IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
s->server_chr->filename);
@@ -925,8 +914,6 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error
**errp)
/* we allocate enough space for 16 peers and grow as needed */
resize_peers(s, 16);
- pci_register_bar(dev, 2, attr, &s->bar);
-
/*
* Receive setup messages from server synchronously.
* Older versions did it asynchronously, but that creates a
@@ -947,6 +934,9 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error
**errp)
}
}
+ vmstate_register_ram(s->ivshmem_bar2, DEVICE(s));
+ pci_register_bar(PCI_DEVICE(s), 2, attr, s->ivshmem_bar2);
+
if (s->role_val == IVSHMEM_PEER) {
error_setg(&s->migration_blocker,
"Migration is disabled when using feature 'peer mode' in
device 'ivshmem'");
@@ -964,22 +954,19 @@ static void pci_ivshmem_exit(PCIDevice *dev)
error_free(s->migration_blocker);
}
- if (memory_region_is_mapped(&s->ivshmem)) {
+ if (memory_region_is_mapped(s->ivshmem_bar2)) {
if (!s->hostmem) {
- void *addr = memory_region_get_ram_ptr(&s->ivshmem);
- int fd;
+ void *addr = memory_region_get_ram_ptr(s->ivshmem_bar2);
if (munmap(addr, s->ivshmem_size) == -1) {
error_report("Failed to munmap shared memory %s",
strerror(errno));
}
- if ((fd = qemu_get_ram_fd(s->ivshmem.ram_addr)) != -1)
- close(fd);
+ close(qemu_get_ram_fd(s->ivshmem_bar2->ram_addr));
}
- vmstate_unregister_ram(&s->ivshmem, DEVICE(dev));
- memory_region_del_subregion(&s->bar, &s->ivshmem);
+ vmstate_unregister_ram(s->ivshmem_bar2, DEVICE(dev));
}
if (s->peers) {
--
2.4.3
