Re: [Qemu-devel] [PATCH] migrate: Migration aborts abruptly for machine "none"

[Ashijeet Acharya]

Okay

On Friday, 27 January 2017, Daniel P. Berrange <address@hidden> wrote:

> On Thu, Jan 26, 2017 at 02:46:52PM +0530, Ashijeet Acharya wrote:
> > Migration of a "none" machine with no RAM crashes abruptly as
> > bitmap_new() fails and thus aborts. Instead, place a check for
> > last_ram_offset() being '0' at the start of ram_save_setup() and
> > error out with a meaningful error message.
> >
> > Signed-off-by: Ashijeet Acharya <address@hidden
> <javascript:;>>
> > ---
> >  migration/ram.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/migration/ram.c b/migration/ram.c
> > index ef8fadf..bf05d69 100644
> > --- a/migration/ram.c
> > +++ b/migration/ram.c
> > @@ -1947,6 +1947,11 @@ static int ram_save_setup(QEMUFile *f, void
> *opaque)
> >  {
> >      RAMBlock *block;
> >
> > +    if (last_ram_offset() == 0) {
> > +        error_report("Failed to migrate: No RAM available!");
> > +        return -1;
> > +    }
> > +
>
> If we're merely going to block migration, as opposed to making it work,
> then IMHO we should use migration blockers registered at machine setup
> for this task.
>
> We have a new cli arg added to QEMU to tell it to abort startup if the
> machine configuration is not migratable. That only works if using


Are you referring to the new "--only-migratable" option I added along with
John last week?

migration blockers - this check you've added is too late to be detected
> at startup.


I think that the machine is not completely 'non-migratable' because if I
boot qemu with "-m 1G" (say) the migration actually completes successfully.

Ashijeet


>
> Regards,
> Daniel
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