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[Qemu-devel] [PULL 19/19] migration: allow private destination ram with
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PULL 19/19] migration: allow private destination ram with x-ignore-shared |
Date: |
Thu, 11 Jul 2019 12:44:12 +0200 |
From: Peng Tao <address@hidden>
By removing the share ram check, qemu is able to migrate
to private destination ram when x-ignore-shared capability
is on. Then we can create multiple destination VMs based
on the same source VM.
This changes the x-ignore-shared migration capability to
work similar to Lai's original bypass-shared-memory
work(https://lists.gnu.org/archive/html/qemu-devel/2018-04/msg00003.html)
which enables kata containers (https://katacontainers.io)
to implement the VM templating feature.
An example usage in kata containers(https://katacontainers.io):
1. Start the source VM:
qemu-system-x86 -m 2G \
-object
memory-backend-file,id=mem0,size=2G,share=on,mem-path=/tmpfs/template-memory \
-numa node,memdev=mem0
2. Stop the template VM, set migration x-ignore-shared capability,
migrate "exec:cat>/tmpfs/state", quit it
3. Start target VM:
qemu-system-x86 -m 2G \
-object
memory-backend-file,id=mem0,size=2G,share=off,mem-path=/tmpfs/template-memory \
-numa node,memdev=mem0 \
-incoming defer
4. connect to target VM qmp, set migration x-ignore-shared capability,
migrate_incoming "exec:cat /tmpfs/state"
5. create more target VMs repeating 3 and 4
Cc: Dr. David Alan Gilbert <address@hidden>
Cc: Yury Kotov <address@hidden>
Cc: Jiangshan Lai <address@hidden>
Cc: Xu Wang <address@hidden>
Signed-off-by: Peng Tao <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
---
migration/ram.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/migration/ram.c b/migration/ram.c
index 8a6ad61d3d..8622b4dc49 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3426,7 +3426,6 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
}
if (migrate_ignore_shared()) {
qemu_put_be64(f, block->mr->addr);
- qemu_put_byte(f, ramblock_is_ignored(block) ? 1 : 0);
}
}
@@ -4393,12 +4392,6 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
}
if (migrate_ignore_shared()) {
hwaddr addr = qemu_get_be64(f);
- bool ignored = qemu_get_byte(f);
- if (ignored != ramblock_is_ignored(block)) {
- error_report("RAM block %s should %s be migrated",
- id, ignored ? "" : "not");
- ret = -EINVAL;
- }
if (ramblock_is_ignored(block) &&
block->mr->addr != addr) {
error_report("Mismatched GPAs for block %s "
--
2.21.0
- [Qemu-devel] [PULL 00/19] Migration patches, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 10/19] memory: Don't set migration bitmap when without migration, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 01/19] migration: fix multifd_recv event typo, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 06/19] cutils: remove one unnecessary pointer operation, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 13/19] memory: Introduce memory listener hook log_clear(), Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 07/19] migration/multifd: sync packet_num after all thread are done, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 02/19] migration-test: rename parameter to parameter_int, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 14/19] kvm: Update comments for sync_dirty_bitmap, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 19/19] migration: allow private destination ram with x-ignore-shared,
Juan Quintela <=
- [Qemu-devel] [PULL 08/19] migratioin/ram.c: reset complete_round when we gets a queued page, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 11/19] bitmap: Add bitmap_copy_with_{src|dst}_offset(), Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 05/19] migration/xbzrle: update cache and current_data in one place, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 09/19] migration: No need to take rcu during sync_dirty_bitmap, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 03/19] migration-test: Add migration multifd test, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 12/19] memory: Pass mr into snapshot_and_clear_dirty, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 04/19] migration/multifd: call multifd_send_sync_main when sending RAM_SAVE_FLAG_EOS, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 17/19] kvm: Support KVM_CLEAR_DIRTY_LOG, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 15/19] kvm: Persistent per kvmslot dirty bitmap, Juan Quintela, 2019/07/11
- [Qemu-devel] [PULL 16/19] kvm: Introduce slots lock for memory listener, Juan Quintela, 2019/07/11