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hw/intc/arm_gicv3_redist: Recalculate hppvlpi on VPENDBASER writes
The guest uses GICR_VPENDBASER to tell the redistributor when it is scheduling or descheduling a vCPU. When it writes and changes the VALID bit from 0 to 1, it is scheduling a vCPU, and we must update our view of the current highest priority pending vLPI from the new Pending and Configuration tables. When it writes and changes the VALID bit from 1 to 0, it is descheduling, which means that there is no longer a highest priority pending vLPI. The specification allows the implementation to use part of the vLPI Pending table as an IMPDEF area where it can cache information when a vCPU is descheduled, so that it can avoid having to do a full rescan of the tables when the vCPU is scheduled again. For now, we don't take advantage of this, and simply do a complete rescan. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20220408141550.1271295-30-peter.maydell@linaro.org
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