[Xen-devel] [PATCH] attempt to reset logdirty if enable fails

[Brendan Cully <brendan@xxxxxxxxx>]

Hi,

If the xc_save process ends gracelessly, it may leave logdirty mode
enabled. This prevents subsequent attempts to live-migrate the domain
from succeeding, because the call to enable logdirty will fail
(failure is overloaded to mean both real failure and that the mode is
already enabled). I don't know how often this happens to people not
fiddling with the live migration code, but it's a theoretical
possibility and there's a fairly simple workaround: try turning the
mode off and then back on. If both succeed, everything should be
fine. Here's a patch that does this.

An operation to test the current shadow mode might also be nice.

Attachment: reset-logdirty.patch
Description: Text Data

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