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qga: implement qmp_guest_get_memory_block_info() for Linux with sysfs

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This conveys general information about guest memory blocks. Currently,
just the memory block size.

The size of a memory block is architecture dependent, it represents the logical
unit upon which memory online/offline operations are to be performed.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>

*generalized guest-get-memory-block-size to get-get-memory-block-info
 for future extensibility

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
zhanghailiang 2015-01-22 10:40:05 +08:00 committed by Michael Roth
parent 32ca7927c7
commit ef82b60be1
1 changed files with 29 additions and 2 deletions
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31
qga/commands-posix.c
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@ -2266,8 +2266,35 @@ err:
GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
{
error_set(errp, QERR_UNSUPPORTED);
return NULL;
Error *local_err = NULL;
char *dirpath;
int dirfd;
char *buf;
GuestMemoryBlockInfo *info;
dirpath = g_strdup_printf("/sys/devices/system/memory/");
dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
if (dirfd == -1) {
error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
g_free(dirpath);
return NULL;
}
g_free(dirpath);
buf = g_malloc0(20);
ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err);
if (local_err) {
g_free(buf);
error_propagate(errp, local_err);
return NULL;
}
info = g_new0(GuestMemoryBlockInfo, 1);
info->size = strtol(buf, NULL, 16); /* the unit is bytes */
g_free(buf);
return info;
}
#else /* defined(__linux__) */