We can get guest's memory block information by using command
"guest-get-memory-blocks", the returned value contains a list of memory block
info, such as phys_index, online state, can-offline info.
Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
---
qga/commands-posix.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 60 insertions(+), 6 deletions(-)
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 8917dca..d3f7d4f 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -2005,6 +2005,60 @@ static void transfer_memory_block(GuestMemoryBlock
*mem_blk, bool sys2memblk,
g_assert(res == 0);
}
+GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
+{
+ GuestMemoryBlockList *head, **link;
+ Error *local_err = NULL;
+ struct dirent *de;
+ DIR *dp;
+
+ head = NULL;
+ link = &head;
+
+ dp = opendir("/sys/devices/system/memory/");
+ if (!dp) {
+ error_setg_errno(errp, errno, "Can't open directory"
+ "\"/sys/devices/system/memory/\"\n");
+ return NULL;
+ }
+
+ /* Note: the phys_index of memory block may be discontinuous,
+ * this is because a memblk is the unit of the Sparse Memory design, which
+ * allows discontinuous memory ranges (ex. NUMA), so here we should
+ * traverse the memory block directory.
+ */
+ while ((de = readdir(dp)) != NULL) {
+ GuestMemoryBlock *mem_blk;
+ GuestMemoryBlockList *entry;
+
+ if ((strncmp(de->d_name, "memory", 6) != 0) ||
+ !(de->d_type & DT_DIR)) {
+ continue;
+ }
+
+ mem_blk = g_malloc0(sizeof *mem_blk);
+ /* The d_name is "memoryXXX", phys_index is block id, same as XXX */
+ mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10);
+ mem_blk->has_can_offline = true; /* lolspeak ftw */
+ transfer_memory_block(mem_blk, true, &local_err);
+
+ entry = g_malloc0(sizeof *entry);
+ entry->value = mem_blk;
+
+ *link = entry;
+ link = &entry->next;
+ }
+
+ if (local_err == NULL) {
+ /* there's no guest with zero memroy blocks */
+ g_assert(head != NULL);
+ return head;
+ }
+
+ qapi_free_GuestMemoryBlockList(head);
+ error_propagate(errp, local_err);
+ return NULL;
+}
#else /* defined(__linux__) */
void qmp_guest_suspend_disk(Error **errp)
@@ -2040,6 +2094,12 @@ int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList
*vcpus, Error **errp)
return -1;
}
+GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
+{
+ error_set(errp, QERR_UNSUPPORTED);
+ return NULL;
+}
+
#endif
#if !defined(CONFIG_FSFREEZE)
@@ -2126,12 +2186,6 @@ GList *ga_command_blacklist_init(GList *blacklist)
return blacklist;
}
-GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
-{
- error_set(errp, QERR_UNSUPPORTED);
- return NULL;
-}
-
int64_t qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks,
Error **errp)
{
--
1.7.12.4
