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hostmem: use object id for memory region name with >= 4.0

Browse source 
hostmem-file and hostmem-memfd use the whole object path for the
memory region name, and hostname-ram uses only the path component (the
object id, or canonical path basename):

qemu -m 1024 -object memory-backend-file,id=mem,size=1G,mem-path=/tmp/foo -numa node,memdev=mem -monitor stdio
(qemu) info ramblock
              Block Name    PSize              Offset               Used              Total
            /objects/mem    4 KiB  0x0000000000000000 0x0000000040000000 0x0000000040000000

qemu -m 1024 -object memory-backend-memfd,id=mem,size=1G -numa node,memdev=mem -monitor stdio
(qemu) info ramblock
              Block Name    PSize              Offset               Used              Total
            /objects/mem    4 KiB  0x0000000000000000 0x0000000040000000 0x0000000040000000

qemu -m 1024 -object memory-backend-ram,id=mem,size=1G -numa node,memdev=mem -monitor stdio
(qemu) info ramblock
              Block Name    PSize              Offset               Used              Total
                     mem    4 KiB  0x0000000000000000 0x0000000040000000 0x0000000040000000

For consistency, change to use object id for -file and -memfd as well
with >= 4.0.

Having a consistent naming allows to migrate to different hostmem
backends.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Marc-André Lureau 2018-09-12 16:18:00 +04:00
parent 51e5ef459e
commit fa0cb34d22
6 changed files with 55 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
backends/hostmem-file.c
View file

@ -43,7 +43,7 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
{
HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend);
#ifdef CONFIG_POSIX
gchar *path;
gchar *name;
#endif
if (!backend->size) {
@ -58,14 +58,14 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
error_setg(errp, "-mem-path not supported on this host");
#else
backend->force_prealloc = mem_prealloc;
path = object_get_canonical_path(OBJECT(backend));
name = host_memory_backend_get_name(backend);
memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
path,
name,
backend->size, fb->align,
(backend->share ? RAM_SHARED : 0) |
(fb->is_pmem ? RAM_PMEM : 0),
fb->mem_path, errp);
g_free(path);
g_free(name);
#endif
}

2
backends/hostmem-memfd.c
View file

@ -53,7 +53,7 @@ memfd_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
return;
}
name = object_get_canonical_path(OBJECT(backend));
name = host_memory_backend_get_name(backend);
memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend),
name, backend->size,
backend->share, fd, errp);

9
backends/hostmem-ram.c
View file

@ -16,21 +16,20 @@
#define TYPE_MEMORY_BACKEND_RAM "memory-backend-ram"
static void
ram_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
{
char *path;
char *name;
if (!backend->size) {
error_setg(errp, "can't create backend with size 0");
return;
}
path = object_get_canonical_path_component(OBJECT(backend));
memory_region_init_ram_shared_nomigrate(&backend->mr, OBJECT(backend), path,
name = host_memory_backend_get_name(backend);
memory_region_init_ram_shared_nomigrate(&backend->mr, OBJECT(backend), name,
backend->size, backend->share, errp);
g_free(path);
g_free(name);
}
static void

36
backends/hostmem.c
View file

@ -28,6 +28,16 @@ QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_BIND != MPOL_BIND);
QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_INTERLEAVE != MPOL_INTERLEAVE);
#endif
char *
host_memory_backend_get_name(HostMemoryBackend *backend)
{
if (!backend->use_canonical_path) {
return object_get_canonical_path_component(OBJECT(backend));
}
return object_get_canonical_path(OBJECT(backend));
}
static void
host_memory_backend_get_size(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
@ -247,6 +257,11 @@ static void host_memory_backend_init(Object *obj)
backend->prealloc = mem_prealloc;
}
static void host_memory_backend_post_init(Object *obj)
{
object_apply_compat_props(obj);
}
bool host_memory_backend_mr_inited(HostMemoryBackend *backend)
{
/*
@ -395,6 +410,23 @@ static void host_memory_backend_set_share(Object *o, bool value, Error **errp)
backend->share = value;
}
static bool
host_memory_backend_get_use_canonical_path(Object *obj, Error **errp)
{
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
return backend->use_canonical_path;
}
static void
host_memory_backend_set_use_canonical_path(Object *obj, bool value,
Error **errp)
{
HostMemoryBackend *backend = MEMORY_BACKEND(obj);
backend->use_canonical_path = value;
}
static void
host_memory_backend_class_init(ObjectClass *oc, void *data)
{
@ -441,6 +473,9 @@ host_memory_backend_class_init(ObjectClass *oc, void *data)
&error_abort);
object_class_property_set_description(oc, "share",
"Mark the memory as private to QEMU or shared", &error_abort);
object_class_property_add_bool(oc, "x-use-canonical-path-for-ramblock-id",
host_memory_backend_get_use_canonical_path,
host_memory_backend_set_use_canonical_path, &error_abort);
}
static const TypeInfo host_memory_backend_info = {
@ -451,6 +486,7 @@ static const TypeInfo host_memory_backend_info = {
.class_init = host_memory_backend_class_init,
.instance_size = sizeof(HostMemoryBackend),
.instance_init = host_memory_backend_init,
.instance_post_init = host_memory_backend_post_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_USER_CREATABLE },
{ }

8
hw/core/machine.c
View file

@ -32,6 +32,14 @@ GlobalProperty hw_compat_3_1[] = {
.driver = "pcie-root-port",
.property = "x-width",
.value = "1",
},{
.driver = "memory-backend-file",
.property = "x-use-canonical-path-for-ramblock-id",
.value = "true",
},{
.driver = "memory-backend-memfd",
.property = "x-use-canonical-path-for-ramblock-id",
.value = "true",
},
};
const size_t hw_compat_3_1_len = G_N_ELEMENTS(hw_compat_3_1);

3
include/sysemu/hostmem.h
View file

@ -53,7 +53,7 @@ struct HostMemoryBackend {
/* protected */
uint64_t size;
bool merge, dump;
bool merge, dump, use_canonical_path;
bool prealloc, force_prealloc, is_mapped, share;
DECLARE_BITMAP(host_nodes, MAX_NODES + 1);
HostMemPolicy policy;
@ -67,5 +67,6 @@ MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend);
void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped);
bool host_memory_backend_is_mapped(HostMemoryBackend *backend);
size_t host_memory_backend_pagesize(HostMemoryBackend *memdev);
char *host_memory_backend_get_name(HostMemoryBackend *backend);
#endif