Yu Wang 46c3276ec8 hv: apicv: avoid enable interrupt window if interrupt delivery enabled ...

If the "virtual-interrupt delivery" is enabled for vmx apicv, then need
avoid to enable interrupt-window exiting. From SDM Vol3, 29.2.1, the
evaluation of pending virtual interrupts only be trigger if
"interrupt-window exiting" is 0.

The original code will enable interrupt-window vmexit if any pending
vlapic interrupts even the "virtual-interrupt delivery" is enabled. It
will cause the pending interrupts can't be evaluate immediately until
guest triggered interrupt-window vmexit.

For "virtual-interrupt delivery" enabled case, just need sync the
pending interrupts to irr and update rvi if needed. And CPU will
evaluate and automatic injecct virtual interrupt at appropriate time. It
doesn't rely on interrupt-window vmexit.

For "virtual-interrupt delivery" disabled case, need to check if satisfy
the virtual interrupt injection conditions before doing the interrupt
injection. If not, then need to enable interrupt-window vmexit and
re-check the conditions in the next time vmexit.

Tracked-On: #1187
Signed-off-by: Yu Wang <yu1.wang@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

2018-09-10 10:12:18 +08:00

..

x86

hv: apicv: avoid enable interrupt window if interrupt delivery enabled

2018-09-10 10:12:18 +08:00