3:55 a.m.
This patch is used to add dump_memory_format to qemu.conf and libvirt will use
it to specify the default format in which qemu dumps guest's memory. But when
"--compress" is specified with "virsh dump --memory-only", the format
configured
by dump_memory_format will be overrided. dump_memory_format can one of elf,
kdump-zlib, kdump-lzo and kdump-snappy. And elf is the default value.
Signed-off-by: Qiao Nuohan <qiaonuohan(a)cn.fujitsu.com>
---
src/qemu/libvirtd_qemu.aug | 1 +
src/qemu/qemu.conf | 13 ++++++++++++-
src/qemu/qemu_conf.c | 3 +++
src/qemu/qemu_conf.h | 2 ++
src/qemu/qemu_driver.c | 37 ++++++++++++++++++++++++++++++++++---
src/qemu/test_libvirtd_qemu.aug.in | 1 +
6 files changed, 53 insertions(+), 4 deletions(-)
diff --git a/src/qemu/libvirtd_qemu.aug b/src/qemu/libvirtd_qemu.aug
index a9ff421..d3704fc 100644
--- a/src/qemu/libvirtd_qemu.aug
+++ b/src/qemu/libvirtd_qemu.aug
@@ -61,6 +61,7 @@ module Libvirtd_qemu =
let save_entry = str_entry "save_image_format"
| str_entry "dump_image_format"
| str_entry "snapshot_image_format"
+ | str_entry "dump_memory_format"
| str_entry "auto_dump_path"
| bool_entry "auto_dump_bypass_cache"
| bool_entry "auto_start_bypass_cache"
diff --git a/src/qemu/qemu.conf b/src/qemu/qemu.conf
index e436084..148a6bc 100644
--- a/src/qemu/qemu.conf
+++ b/src/qemu/qemu.conf
@@ -292,7 +292,8 @@
# dump_image_format is used when you use 'virsh dump' at emergency
# crashdump, and if the specified dump_image_format is not valid, or
# the requested compression program can't be found, this falls
-# back to "raw" compression.
+# back to "raw" compression. Note, dump_image_format doesn't work when you
use
+# "virsh dump --memory-only".
#
# snapshot_image_format specifies the compression algorithm of the memory save
# image when an external snapshot of a domain is taken. This does not apply
@@ -303,6 +304,16 @@
#dump_image_format = "raw"
#snapshot_image_format = "raw"
+# Qemu can dump guest's memory in elf format or in kdump-compressed format, and
+# the compression of kdump_compressed format can be zlib/lzo/snappy.
+#
+# dump_memory_format is used to specify the format in which qemu dumps guest's
+# memory. However, if "--compress" is specified with 'virsh dump
--memory-only',
+# dump_memory_format will not work.
+# dump_memory_format can be elf, kdump-zlib, kdump-lzo and kdump-snappy.
+#
+#dump_memory_format = "elf"
+
# When a domain is configured to be auto-dumped when libvirtd receives a
# watchdog event from qemu guest, libvirtd will save dump files in directory
# specified by auto_dump_path. Default value is /var/lib/libvirt/qemu/dump
diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index ecaaf81..7d225da 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -296,6 +296,7 @@ static void virQEMUDriverConfigDispose(void *obj)
VIR_FREE(cfg->saveImageFormat);
VIR_FREE(cfg->dumpImageFormat);
+ VIR_FREE(cfg->dumpMemoryFormat);
VIR_FREE(cfg->autoDumpPath);
virStringFreeList(cfg->securityDriverNames);
@@ -548,6 +549,8 @@ int virQEMUDriverConfigLoadFile(virQEMUDriverConfigPtr cfg,
GET_VALUE_STR("dump_image_format", cfg->dumpImageFormat);
GET_VALUE_STR("snapshot_image_format", cfg->snapshotImageFormat);
+ GET_VALUE_STR("dump_memory_format", cfg->dumpMemoryFormat);
+
GET_VALUE_STR("auto_dump_path", cfg->autoDumpPath);
GET_VALUE_BOOL("auto_dump_bypass_cache", cfg->autoDumpBypassCache);
GET_VALUE_BOOL("auto_start_bypass_cache", cfg->autoStartBypassCache);
diff --git a/src/qemu/qemu_conf.h b/src/qemu/qemu_conf.h
index 1f44a76..97b0f67 100644
--- a/src/qemu/qemu_conf.h
+++ b/src/qemu/qemu_conf.h
@@ -149,6 +149,8 @@ struct _virQEMUDriverConfig {
char *dumpImageFormat;
char *snapshotImageFormat;
+ char *dumpMemoryFormat;
+
char *autoDumpPath;
bool autoDumpBypassCache;
bool autoStartBypassCache;
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 7b6fa43..99df954 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -3410,6 +3410,21 @@ static int qemuDumpToFd(virQEMUDriverPtr driver,
virDomainObjPtr vm,
return ret;
}
+typedef enum {
+ QEMU_DUMP_MEMORY_FORMAT_ELF = 0,
+ QEMU_DUMP_MEMORY_FORMAT_KDUMP_ZLIB = 1,
+ QEMU_DUMP_MEMORY_FORMAT_KDUMP_LZO = 2,
+ QEMU_DUMP_MEMORY_FORMAT_KDUMP_SNAPPY = 3,
+ QEMU_DUMP_MEMORY_FORMAT_LAST
+} virQEMUDumpMemoryFormat;
+
+VIR_ENUM_DECL(qemuDumpMemoryFormat)
+VIR_ENUM_IMPL(qemuDumpMemoryFormat, QEMU_DUMP_MEMORY_FORMAT_LAST,
+ "elf",
+ "kdump-zlib",
+ "kdump-lzo",
+ "kdump-snappy")
+
static int
doCoreDump(virQEMUDriverPtr driver,
virDomainObjPtr vm,
@@ -3423,7 +3438,9 @@ doCoreDump(virQEMUDriverPtr driver,
virFileWrapperFdPtr wrapperFd = NULL;
int directFlag = 0;
unsigned int flags = VIR_FILE_WRAPPER_NON_BLOCKING;
- const char *dump_format;
+ const char *dump_format = "elf";
+ virQEMUDriverConfigPtr cfg = NULL;
+ int dump_memory_format;
/* Create an empty file with appropriate ownership. */
if (dump_flags & VIR_DUMP_BYPASS_CACHE) {
@@ -3453,8 +3470,22 @@ doCoreDump(virQEMUDriverPtr driver,
dump_format = "kdump-lzo";
else if (memory_dump_format == VIR_MEMORY_DUMP_COMPRESS_SNAPPY)
dump_format = "kdump-snappy";
- else
- dump_format = "elf";
+ else {
+ /* when --compress option is specified, qemu.conf will not work */
+ cfg = virQEMUDriverGetConfig(driver);
+ if (cfg->dumpMemoryFormat) {
+ dump_memory_format = qemuDumpMemoryFormatTypeFromString(
+ cfg->dumpMemoryFormat);
+ if (dump_memory_format == QEMU_DUMP_MEMORY_FORMAT_KDUMP_ZLIB)
+ dump_format = "kdump-zlib";
+ else if (dump_memory_format ==
+ QEMU_DUMP_MEMORY_FORMAT_KDUMP_LZO)
+ dump_format = "kdump-lzo";
+ else if (dump_memory_format ==
+ QEMU_DUMP_MEMORY_FORMAT_KDUMP_SNAPPY)
+ dump_format = "kdump-snappy";
+ }
+ }
ret = qemuDumpToFd(driver, vm, fd, QEMU_ASYNC_JOB_DUMP,
dump_format);
} else {
diff --git a/src/qemu/test_libvirtd_qemu.aug.in b/src/qemu/test_libvirtd_qemu.aug.in
index 81fedd6..9d0bcec 100644
--- a/src/qemu/test_libvirtd_qemu.aug.in
+++ b/src/qemu/test_libvirtd_qemu.aug.in
@@ -51,6 +51,7 @@ module Test_libvirtd_qemu =
}
{ "save_image_format" = "raw" }
{ "dump_image_format" = "raw" }
+{ "dump_memory_format" = "elf" }
{ "snapshot_image_format" = "raw" }
{ "auto_dump_path" = "/var/lib/libvirt/qemu/dump" }
{ "auto_dump_bypass_cache" = "0" }