On 11/5/19 7:43 PM, Andrew Cooper wrote: > The safety of livepatching depends on every stack having been unwound, but > there is one corner case where this is not true. The Sharing/Paging/Monitor > infrastructure may use waitqueues, which copy the stack frame sideways and > longjmp() to a different vcpu. > > This case is rare, and can be worked around by pausing the offending > domain(s), waiting for their rings to drain, then performing a livepatch. > > In the case that there is an active waitqueue, fail the livepatch attempt with > -EBUSY, which is preforable to the fireworks which occur from trying to unwind > the old stack frame at a later point. > > Signed-off-by: Andrew Cooper <[email protected]> Reviewed-by: Ross Lagerwall <[email protected]>
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