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migration: Introduce ignore-shared capability 

We want to use local migration to update QEMU for running guests.
In this case we don't need to migrate shared (file backed) RAM.
So, add a capability to ignore such blocks during live migration.

Signed-off-by: Yury Kotov <yury-kotov@yandex-team.ru>
Message-Id: <20190215174548.2630-3-yury-kotov@yandex-team.ru>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Yury Kotov 2019-02-15 20:45:45 +03:00 committed by Dr. David Alan Gilbert
parent 754cb9c0eb
commit 18269069c3
3 changed files with 19 additions and 1 deletions
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14
migration/migration.c
View File

@ -995,6 +995,11 @@ static bool migrate_caps_check(bool *cap_list,
error_setg(errp, "Postcopy is not supported");
return false;
}
if (cap_list[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
error_setg(errp, "Postcopy is not compatible with ignore-shared");
return false;
}
}
return true;
@ -2074,6 +2079,15 @@ bool migrate_dirty_bitmaps(void)
return s->enabled_capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS];
}
bool migrate_ignore_shared(void)
{
MigrationState *s;
s = migrate_get_current();
return s->enabled_capabilities[MIGRATION_CAPABILITY_X_IGNORE_SHARED];
}
bool migrate_use_events(void)
{
MigrationState *s;

1
migration/migration.h
View File

@ -265,6 +265,7 @@ bool migrate_release_ram(void);
bool migrate_postcopy_ram(void);
bool migrate_zero_blocks(void);
bool migrate_dirty_bitmaps(void);
bool migrate_ignore_shared(void);
bool migrate_auto_converge(void);
bool migrate_use_multifd(void);

5
qapi/migration.json
View File

@ -409,13 +409,16 @@
# devices (and thus take locks) immediately at the end of migration.
# (since 3.0)
#
# @x-ignore-shared: If enabled, QEMU will not migrate shared memory (since 4.0)
#
# Since: 1.2
##
{ 'enum': 'MigrationCapability',
'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
'block', 'return-path', 'pause-before-switchover', 'x-multifd',
'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate' ] }
'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate',
'x-ignore-shared' ] }
##
# @MigrationCapabilityStatus: