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Re: [Qemu-devel] [PATCH 02/11] migration: qemu_savevm_state_cleanup() in

From: Juan Quintela
Subject: Re: [Qemu-devel] [PATCH 02/11] migration: qemu_savevm_state_cleanup() in cleanup
Date: Wed, 03 Jan 2018 11:21:31 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

Peter Xu <address@hidden> wrote:
> On Wed, Jan 03, 2018 at 10:15:41AM +0100, Juan Quintela wrote:
>> Peter Xu <address@hidden> wrote:
>> > Moving existing callers all into migrate_fd_cleanup().  It simplifies
>> > migration_thread() a bit.
>> >
>> > Signed-off-by: Peter Xu <address@hidden>
>> Reviewed-by: Juan Quintela <address@hidden>
> Thanks.
>> I am trying to see if we can call migrate_fd_cleanup() twice.  As far as
>> I can see, we are not doing it.  But, and it is a big but, we are not
>> checking that we are not calling qemu_savevm_state_cleanup() twice.  If
>> that happens, we can get double frees and similar.
>> I put the reviewed-by anyways, because I *think* that we are doing it
>> right now, and otherwise, we should make sure that we are not calling it
>> twice, not papering over it.
>> Once here, I have notice that we call block_cleanup_parameters() in
>> *three* places.  We call notifier_list_notify() on two of this places (I
>> can't see any good reason *why* we don't call the notifier for
>> migrate_fd_cancel).
> Indeed.
> IMHO we can remove two calls of block_cleanup_parameters(), only keep
> the one in migrate_fd_cleanup(), and remove on notifier_list_notify()
> in migrate_fd_error() (these can be two more patches).  What do you
> think?

I think we need to make sure that we have a function that we always
call at the end.  I think that we have that on migration_fd_cleanup(),
so put everything there should be ok, no?

Later, Juan.

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