From 18269069c31089c3b42ef78ddffe1ee5799e2708 Mon Sep 17 00:00:00 2001 From: Yury Kotov Date: Fri, 15 Feb 2019 20:45:45 +0300 Subject: [PATCH] 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 Message-Id: <20190215174548.2630-3-yury-kotov@yandex-team.ru> Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Dr. David Alan Gilbert --- migration/migration.c | 14 ++++++++++++++ migration/migration.h | 1 + qapi/migration.json | 5 ++++- 3 files changed, 19 insertions(+), 1 deletion(-) diff --git a/migration/migration.c b/migration/migration.c index d45561f9b8..e823fd8b91 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -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; diff --git a/migration/migration.h b/migration/migration.h index c99154dea2..443051adb0 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -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); diff --git a/qapi/migration.json b/qapi/migration.json index 1fd7bbea9b..eab87340b2 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -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: