[Xen-devel] [PATCH]PIT broadcast to fix local APIC timer stop issue for Deep C state

["Wei, Gang" <gang.wei@xxxxxxxxx>]

Local APIC timer may stop at deep C state (C3/C4...) entry/exit. Initial
HPET broadcast working in legacy replacing mode, broke RTC intr, so was
bypassed. This patch add the logic that use platform timer (PIT) to
reenable local APIC timer at C state entry/exit.

Currently, only keep PIT enabled with 100Hz freq. The next step is
trying to dynamically enable/disable PIT while needed, and give it lower
freq.

signed-off-by: Yu Ke <ke.yu@xxxxxxxxx>
signed-off-by: Tian Kevin <kevin.tian@xxxxxxxxx>
signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>

Jimmy

Attachment: pit_broadcast.patch
Description: pit_broadcast.patch

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