From: Bohdan Trach <bohdan.tr...@mailbox.tu-dresden.de>
dump-pc-mem command is added for checkpointing guest memory to
file. Only system RAM region is saved. This checkpoint is later used to
recover unchanged pages.
Signed-off-by: Bohdan Trach <bohdan.tr...@mailbox.tu-dresden.de>
---
arch_init.c | 19 +++++++++++++++++++
hmp-commands.hx | 16 ++++++++++++++++
hmp.c | 9 +++++++++
hmp.h | 1 +
qapi-schema.json | 11 +++++++++++
qmp-commands.hx | 19 +++++++++++++++++++
6 files changed, 75 insertions(+)
diff --git a/arch_init.c b/arch_init.c
index 4c8fcee..b8a4fb1 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -603,6 +603,25 @@ static void migration_bitmap_sync(void)
}
}
+void qmp_dump_pc_ram(const char *file, Error **errp) {
+
+ int rc;
+ int fd;
+ fd = open(file,
+ O_CREAT|O_WRONLY,
+ S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+ assert(-1 != fd);
+
+ RAMBlock *block = QLIST_FIRST_RCU(&ram_list.blocks);
+ uint64_t offset;
+ for (offset=0; offset<ram_size; offset+=TARGET_PAGE_SIZE) {
+ rc = write(fd, block->host+offset, TARGET_PAGE_SIZE);
+ assert(TARGET_PAGE_SIZE == rc);
+ }
+ rc = close(fd);
+ assert(0 == rc);
+}
+
/**
* ram_save_page: Send the given page to the stream
*
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 3089533..0c47a4f 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1043,6 +1043,22 @@ gdb. Without -z|-l|-s, the dump format is ELF.
ETEXI
{
+ .name = "dump-pc-ram",
+ .args_type = "filename:F",
+ .params = "filename",
+ .help = "dump pc ram to file",
+ .mhandler.cmd = hmp_dump_pc_ram,
+ },
+
+
+STEXI
+@item dump-pc-ram
+@findex dump-guest-memory
+Dump pc ram to file.
+ filename: dump file name
+ETEXI
+
+ {
.name = "snapshot_blkdev",
.args_type = "reuse:-n,device:B,snapshot-file:s?,format:s?",
.params = "[-n] device [new-image-file] [format]",
diff --git a/hmp.c b/hmp.c
index f31ae27..5e27dd8 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1473,6 +1473,15 @@ void hmp_dump_guest_memory(Monitor *mon, const QDict
*qdict)
g_free(prot);
}
+void hmp_dump_pc_ram(Monitor *mon, const QDict *qdict)
+{
+ Error *errp = NULL;
+ const char *file = qdict_get_str(qdict, "filename");
+
+ qmp_dump_pc_ram(file, &errp);
+ hmp_handle_error(mon, &errp);
+}
+
void hmp_netdev_add(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
diff --git a/hmp.h b/hmp.h
index 2b9308b..805a71b 100644
--- a/hmp.h
+++ b/hmp.h
@@ -79,6 +79,7 @@ void hmp_block_job_complete(Monitor *mon, const QDict *qdict);
void hmp_migrate(Monitor *mon, const QDict *qdict);
void hmp_device_del(Monitor *mon, const QDict *qdict);
void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict);
+void hmp_dump_pc_ram(Monitor *mon, const QDict *qdict);
void hmp_netdev_add(Monitor *mon, const QDict *qdict);
void hmp_netdev_del(Monitor *mon, const QDict *qdict);
void hmp_getfd(Monitor *mon, const QDict *qdict);
diff --git a/qapi-schema.json b/qapi-schema.json
index ac9594d..338bfd3 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3648,3 +3648,14 @@
# Since: 2.1
##
{ 'command': 'rtc-reset-reinjection' }
+
+##
+# @dump-pc-ram:
+#
+# Checkpoints guest.
+#
+# @file: the file to save the memory to as binary data
+#
+# Returns: Nothing on success
+##
+{ 'command': 'dump-pc-ram', 'data': {'file': 'str'} }
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 3a42ad0..0be3c42 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -854,6 +854,25 @@ Notes:
EQMP
{
+ .name = "dump-pc-ram",
+ .args_type = "file:s",
+ .params = "file",
+ .help = "dump pc ram to file",
+ .user_print = monitor_user_noop,
+ .mhandler.cmd_new = qmp_marshal_input_dump_pc_ram,
+ },
+
+SQMP
+dump
+
+
+Dump pc ram to file.
+
+Arguments:
+
+EQMP
+
+ {
.name = "query-dump-guest-memory-capability",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_dump_guest_memory_capability,
--
2.0.5
