On Fri, 2023-09-29 at 15:25 +0000, Sean Christopherson wrote: > > Possibly silly question: why can't preemption simply be disabled for the duration > of the sensitive calculation? I suppose it can, but you should still be doing all this from a *single* TSC read. You might get an interrupt, you might have time stolen by SMM, or you might be an L1 guest hosting an L2 with nested virt...
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