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vmi
2006 Dec 01
0
[PATCH] A fix for CR8 acceleration on 64bit guest
...ration on 64bit guest.
For current CR8 acceleration, we do not call update_tpr_threshold() at
every VMEXIT.
But at some situations, we cannot inject guest interrupts in time. And
at some critical time, it will bring up a blue screen to 64bit Windows
guest.
Try this scenario:
1) At one VMIT, tpr = TPR_THRESHOLD, but tpr < pending IRQ, and we
cannot inject it to guest because guest Cli or IRQ < max(tpr, ISR).
2) Guest raises the TPR to a high value.
3) And then guest lowers the TPR to a low value which is higher
than the TPR_THRESHOLD but lower than the pending IRQ....