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Re: [Qemu-devel] [PATCH 0/3] UUID validation during migration
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH 0/3] UUID validation during migration |
Date: |
Tue, 3 Sep 2019 12:21:40 +0100 |
User-agent: |
Mutt/1.12.1 (2019-06-15) |
* Yury Kotov (address@hidden) wrote:
> Hi,
>
> This series adds an UUID validation at the start of the migration
> on the target side. The idea is to identify the source of migration.
>
> Possible case of problem:
> 1. There are 3 servers: A, B and C
> 2. Server A has a VM 1, server B has a VM 2
> 3. VM 1 and VM 2 want to migrate to the server C
> 4. Target of VM 1 starts on the server C and dies too quickly for some reason
> 5. Target of VM 2 starts just after that and listen the same tcp port X, which
> the target of VM 1 wanted to use
> 6. Source of VM 1 connects to the tcp port X, and migrates to VM 2 source
That shouldn't be possible in practice; you specify the destination tcp
port when you start the destination qemu; so unless the management code
that starts the migration is very broken it should know which port it's
migrating to.
However, if it is very broken then this is a good check.
Dave
> 7. It's possible that migration might be successful (e.g., devices are the
> same)
> 8. So, the target of VM 2 is in undefined state
>
> The series adds a capability to prevent successful (by mistake) migration.
>
> The new capability x-validate-uuid only affects the source so that it sends
> its UUID to the target. The target will validate the received UUID and stop
> the migration if UUIDs are not equal.
>
> Regards,
> Yury
>
> Yury Kotov (3):
> migration: Add x-validate-uuid capability
> tests/libqtest: Allow to set expected exit status
> tests/migration: Add a test for x-validate-uuid capability
>
> migration/migration.c | 9 +++
> migration/migration.h | 1 +
> migration/savevm.c | 45 +++++++++++++
> qapi/migration.json | 5 +-
> tests/libqtest.c | 14 ++++-
> tests/libqtest.h | 9 +++
> tests/migration-test.c | 140 ++++++++++++++++++++++++++++++++---------
> 7 files changed, 189 insertions(+), 34 deletions(-)
>
> --
> 2.22.0
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- Re: [Qemu-devel] [PATCH 0/3] UUID validation during migration,
Dr. David Alan Gilbert <=