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memory: add error propagation to file-based RAM allocation 

Right now, -mem-path will fall back to RAM-based allocation in some
cases.  This should never happen with "-object memory-file", prepare
the code by adding correct error propagation.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

MST: drop \n at end of error messages
This commit is contained in:
Paolo Bonzini 2014-05-14 17:43:20 +08:00 committed by Michael S. Tsirkin
parent 0b183fc871
commit 7f56e740a6
5 changed files with 44 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
exec.c
View File

@ -1016,7 +1016,8 @@ static long gethugepagesize(const char *path)
static void *file_ram_alloc(RAMBlock *block,
ram_addr_t memory,
const char *path)
const char *path,
Error **errp)
{
char *filename;
char *sanitized_name;
@ -1035,7 +1036,8 @@ static void *file_ram_alloc(RAMBlock *block,
}
if (kvm_enabled() && !kvm_has_sync_mmu()) {
fprintf(stderr, "host lacks kvm mmu notifiers, -mem-path unsupported\n");
error_setg(errp,
"host lacks kvm mmu notifiers, -mem-path unsupported");
goto error;
}
@ -1052,7 +1054,8 @@ static void *file_ram_alloc(RAMBlock *block,
fd = mkstemp(filename);
if (fd < 0) {
perror("unable to create backing store for hugepages");
error_setg_errno(errp, errno,
"unable to create backing store for hugepages");
g_free(filename);
goto error;
}
@ -1067,12 +1070,14 @@ static void *file_ram_alloc(RAMBlock *block,
* If anything goes wrong with it under other filesystems,
* mmap will fail.
*/
if (ftruncate(fd, memory))
if (ftruncate(fd, memory)) {
perror("ftruncate");
}
area = mmap(0, memory, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
if (area == MAP_FAILED) {
perror("file_ram_alloc: can't mmap RAM pages");
error_setg_errno(errp, errno,
"unable to map backing store for hugepages");
close(fd);
goto error;
}
@ -1281,13 +1286,14 @@ static ram_addr_t ram_block_add(RAMBlock *new_block)
#ifdef __linux__
ram_addr_t qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
const char *mem_path)
const char *mem_path,
Error **errp)
{
RAMBlock *new_block;
if (xen_enabled()) {
fprintf(stderr, "-mem-path not supported with Xen\n");
exit(1);
error_setg(errp, "-mem-path not supported with Xen");
return -1;
}
if (phys_mem_alloc != qemu_anon_ram_alloc) {
@ -1296,16 +1302,22 @@ ram_addr_t qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
* phys_mem_alloc, but we haven't bothered to provide
* a hook there.
*/
fprintf(stderr,
"-mem-path not supported with this accelerator\n");
exit(1);
error_setg(errp,
"-mem-path not supported with this accelerator");
return -1;
}
size = TARGET_PAGE_ALIGN(size);
new_block = g_malloc0(sizeof(*new_block));
new_block->mr = mr;
new_block->length = size;
new_block->host = file_ram_alloc(new_block, size, mem_path);
new_block->host = file_ram_alloc(new_block, size,
mem_path, errp);
if (!new_block->host) {
g_free(new_block);
return -1;
}
return ram_block_add(new_block);
}
#endif

5
include/exec/memory.h
View File

@ -31,6 +31,7 @@
#include "qemu/queue.h"
#include "qemu/int128.h"
#include "qemu/notify.h"
#include "qapi/error.h"
#define MAX_PHYS_ADDR_SPACE_BITS 62
#define MAX_PHYS_ADDR (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)
@ -321,12 +322,14 @@ void memory_region_init_ram(MemoryRegion *mr,
* @name: the name of the region.
* @size: size of the region.
* @path: the path in which to allocate the RAM.
* @errp: pointer to Error*, to store an error if it happens.
*/
void memory_region_init_ram_from_file(MemoryRegion *mr,
struct Object *owner,
const char *name,
uint64_t size,
const char *path);
const char *path,
Error **errp);
#endif
/**

2
include/exec/ram_addr.h
View File

@ -23,7 +23,7 @@
#include "hw/xen/xen.h"
ram_addr_t qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
const char *mem_path);
const char *mem_path, Error **errp);
ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
MemoryRegion *mr);
ram_addr_t qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr);

5
memory.c
View File

@ -1038,13 +1038,14 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
struct Object *owner,
const char *name,
uint64_t size,
const char *path)
const char *path,
Error **errp)
{
memory_region_init(mr, owner, name, size);
mr->ram = true;
mr->terminates = true;
mr->destructor = memory_region_destructor_ram;
mr->ram_addr = qemu_ram_alloc_from_file(size, mr, path);
mr->ram_addr = qemu_ram_alloc_from_file(size, mr, path, errp);
}
#endif

13
numa.c
View File

@ -230,7 +230,18 @@ static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner,
{
if (mem_path) {
#ifdef __linux__
memory_region_init_ram_from_file(mr, owner, name, ram_size, mem_path);
Error *err = NULL;
memory_region_init_ram_from_file(mr, owner, name, ram_size,
mem_path, &err);
/* Legacy behavior: if allocation failed, fall back to
* regular RAM allocation.
*/
if (!memory_region_size(mr)) {
qerror_report_err(err);
error_free(err);
memory_region_init_ram(mr, owner, name, ram_size);
}
#else
fprintf(stderr, "-mem-path not supported on this host\n");
exit(1);