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2008 Oct 07
6
A race condition introduced by changeset 15175: Re-init hypercall stubs page after HVM save/restore
For an SMP Linux HVM guest with PV drivers inserted, when we do save/restore (or LiveMigration) for the guest, it might panic after it''s restored.
The panic point is inside ap_suspend():
....
while (info->do_spin) {
cpu_relax();
read_lock(&suspend_lock);
HYPERVISOR_yield(); ----> guest might panic on the invocation of this function.
read_unlock(&suspend_lock);
}
...
The root cause is: ap might be invoking the hypercall while bsp is asking the hypervisor t...