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[Qemu-devel] [PATCH v2 4/5] qga: implement qmp_guest_get_memory_block_si
From: |
zhanghailiang |
Subject: |
[Qemu-devel] [PATCH v2 4/5] qga: implement qmp_guest_get_memory_block_size() for Linux with sysfs |
Date: |
Thu, 22 Jan 2015 10:40:05 +0800 |
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 <address@hidden>
---
qga/commands-posix.c | 29 +++++++++++++++++++++++++++--
1 file changed, 27 insertions(+), 2 deletions(-)
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 4b41385..44d9e8f 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -2147,8 +2147,33 @@ err:
int64_t qmp_guest_get_memory_block_size(Error **errp)
{
- error_set(errp, QERR_UNSUPPORTED);
- return -1;
+ Error *local_err = NULL;
+ char *dirpath;
+ int dirfd;
+ char *buf;
+ int64_t block_size;
+
+ 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 -1;
+ }
+ 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 -1;
+ }
+
+ block_size = strtol(buf, NULL, 16); /* the unit is bytes */
+ g_free(buf);
+
+ return block_size;
}
#else /* defined(__linux__) */
--
1.7.12.4