Re: [Xen-devel] TLB flushing in blktap kernel driver?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> However, I can't understand right now why we need the tlb flush here.
> If we're doing any grant table operations between dom0 and domU, then
> the HV should be doing the tlb flushes for us, shouldn't it?  And mere
> SMP synchronisation on a ring buffer requires a physical memory barrier,
> not a TLB synchronisation (and RING_PUSH_REQUESTS already does a wmb.)

Grant unmapping certainly guarantees to flush TLB entries.

 -- Keir



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