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authorMarkus Armbruster <armbru@redhat.com>2016-03-15 19:34:47 +0100
committerMarkus Armbruster <armbru@redhat.com>2016-03-21 21:29:02 +0100
commitc2d8019cd7e9c38c5ef9dc44ae1e3adccd57a6a4 (patch)
treefce51bbb80944274f823fb70c33305500f3344df /hw/misc/ivshmem.c
parent5503e285041979dd29698ecb41729b3b22622e8d (diff)
ivshmem: Simplify memory regions for BAR 2 (shared memory)
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 <armbru@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1458066895-20632-33-git-send-email-armbru@redhat.com>
Diffstat (limited to 'hw/misc/ivshmem.c')
-rw-r--r--hw/misc/ivshmem.c47
1 files changed, 17 insertions, 30 deletions
diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index 138ae9d3bd..1b1de65974 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(memory_region_get_ram_addr(&s->ivshmem), fd);
- vmstate_register_ram(&s->ivshmem, DEVICE(s));
- memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
+ qemu_set_ram_fd(memory_region_get_ram_addr(&s->server_bar2), fd);
+ s->ivshmem_bar2 = &s->server_bar2;
}
static void process_msg_disconnect(IVShmemState *s, uint16_t posn,
@@ -702,7 +697,7 @@ static void ivshmem_recv_setup(IVShmemState *s, Error **errp)
* successfully processed the server's shared memory message.
* Assert that actually mapped the shared memory:
*/
- assert(memory_region_is_mapped(&s->ivshmem));
+ assert(s->ivshmem_bar2);
}
/* Select the MSI-X vectors used by device.
@@ -903,7 +898,6 @@ 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;
}
@@ -913,15 +907,10 @@ 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);
@@ -929,8 +918,6 @@ 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
@@ -951,6 +938,9 @@ 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'");
@@ -968,9 +958,9 @@ 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);
+ void *addr = memory_region_get_ram_ptr(s->ivshmem_bar2);
int fd;
if (munmap(addr, s->ivshmem_size) == -1) {
@@ -978,14 +968,11 @@ static void pci_ivshmem_exit(PCIDevice *dev)
strerror(errno));
}
- fd = qemu_get_ram_fd(memory_region_get_ram_addr(&s->ivshmem));
- if (fd != -1) {
- close(fd);
- }
+ fd = qemu_get_ram_fd(memory_region_get_ram_addr(s->ivshmem_bar2));
+ close(fd);
}
- 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) {