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[Qemu-devel] [PATCH v2] block migration: Allow compile time disable
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[Qemu-devel] [PATCH v2] block migration: Allow compile time disable |
Date: |
Mon, 15 May 2017 15:05:29 +0100 |
From: "Dr. David Alan Gilbert" <address@hidden>
Many users now prefer to use drive_mirror over NBD as an
alternative to the older migrate -b option; drive_mirror is
more complex to setup but gives you more options (e.g. only
migrating some of the disks if some of them are shared).
Allow the large chunk of block migration code to be compiled
out for those who don't use it.
Based on a downstream-patch we've had for a while by Jeff Cody.
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
---
configure | 11 +++++++++++
include/migration/block.h | 23 +++++++++++++++++++++++
migration/Makefile.objs | 2 +-
migration/migration.c | 9 +++++++++
4 files changed, 44 insertions(+), 1 deletion(-)
v2
use error_append_hint, remove a '.' - Eric
Move ifdef's to block.h header - Juan
Explicitly state the blk/-b inc/-i in the message - Kashyap
diff --git a/configure b/configure
index 39e727ef7e..29f5f626d7 100755
--- a/configure
+++ b/configure
@@ -316,6 +316,7 @@ vte=""
virglrenderer=""
tpm="yes"
libssh2=""
+live_block_migration="yes"
numa=""
tcmalloc="no"
jemalloc="no"
@@ -1168,6 +1169,10 @@ for opt do
;;
--enable-libssh2) libssh2="yes"
;;
+ --disable-live-block-migration) live_block_migration="no"
+ ;;
+ --enable-live-block-migration) live_block_migration="yes"
+ ;;
--disable-numa) numa="no"
;;
--enable-numa) numa="yes"
@@ -1400,6 +1405,7 @@ disabled with --disable-FEATURE, default is enabled if
available:
libnfs nfs support
smartcard smartcard support (libcacard)
libusb libusb (for usb passthrough)
+ live-block-migration Block migration in the main migration stream
usb-redir usb network redirection support
lzo support of lzo compression library
snappy support of snappy compression library
@@ -5215,6 +5221,7 @@ echo "TPM support $tpm"
echo "libssh2 support $libssh2"
echo "TPM passthrough $tpm_passthrough"
echo "QOM debugging $qom_cast_debug"
+echo "Live block migration $live_block_migration"
echo "lzo support $lzo"
echo "snappy support $snappy"
echo "bzip2 support $bzip2"
@@ -5781,6 +5788,10 @@ if test "$libssh2" = "yes" ; then
echo "LIBSSH2_LIBS=$libssh2_libs" >> $config_host_mak
fi
+if test "$live_block_migration" = "yes" ; then
+ echo "CONFIG_LIVE_BLOCK_MIGRATION=y" >> $config_host_mak
+fi
+
# USB host support
if test "$libusb" = "yes"; then
echo "HOST_USB=libusb legacy" >> $config_host_mak
diff --git a/include/migration/block.h b/include/migration/block.h
index 41a1ac8f79..1a096e3978 100644
--- a/include/migration/block.h
+++ b/include/migration/block.h
@@ -14,10 +14,33 @@
#ifndef MIGRATION_BLOCK_H
#define MIGRATION_BLOCK_H
+#ifdef CONFIG_LIVE_BLOCK_MIGRATION
void blk_mig_init(void);
int blk_mig_active(void);
uint64_t blk_mig_bytes_transferred(void);
uint64_t blk_mig_bytes_remaining(void);
uint64_t blk_mig_bytes_total(void);
+#else
+static inline void blk_mig_init(void) { };
+static inline int blk_mig_active(void)
+{
+ return false;
+}
+static inline uint64_t blk_mig_bytes_transferred(void)
+{
+ return 0;
+}
+
+static inline uint64_t blk_mig_bytes_remaining(void)
+{
+ return 0;
+}
+
+static inline uint64_t blk_mig_bytes_total(void)
+{
+ return 0;
+}
+#endif /* CONFIG_LIVE_BLOCK_MIGRATION */
+
#endif /* MIGRATION_BLOCK_H */
diff --git a/migration/Makefile.objs b/migration/Makefile.objs
index 480dd493a9..200b5e0c67 100644
--- a/migration/Makefile.objs
+++ b/migration/Makefile.objs
@@ -9,5 +9,5 @@ common-obj-y += qjson.o
common-obj-$(CONFIG_RDMA) += rdma.o
-common-obj-y += block.o
+common-obj-$(CONFIG_LIVE_BLOCK_MIGRATION) += block.o
diff --git a/migration/migration.c b/migration/migration.c
index a5ade23e24..457f0b92df 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1213,6 +1213,15 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
params.blk = has_blk && blk;
params.shared = has_inc && inc;
+#ifndef CONFIG_LIVE_BLOCK_MIGRATION
+ if (params.blk || params.shared) {
+ error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
+ "block migration");
+ error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
+ return;
+ }
+#endif
+
if (migration_is_setup_or_active(s->state) ||
s->state == MIGRATION_STATUS_CANCELLING ||
s->state == MIGRATION_STATUS_COLO) {
--
2.13.0
- [Qemu-devel] [PATCH v2] block migration: Allow compile time disable,
Dr. David Alan Gilbert (git) <=