On 2013-09-13 19:15, Paolo Bonzini wrote: > Il 06/09/2013 04:04, Arthur Chunqi Li ha scritto: >> + preempt_val_l1 = delta_tsc_l1 >> preempt_scale; >> + if (preempt_val_l2 <= preempt_val_l1) >> + preempt_val_l2 = 0; >> + else >> + preempt_val_l2 -= preempt_val_l1; >> + vmcs_write32(VMX_PREEMPTION_TIMER_VALUE, preempt_val_l2); > > Did you test that a value of 0 triggers an immediate exit, rather than > counting down by 2^32? Perhaps it's safer to limit the value to 1 > instead of 0. To my experience, 0 triggers immediate exists when the preemption timer is enabled. Jan
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