KVM: LAPIC: add APIC Timer periodic/oneshot mode VMX preemption timer support

KVM: LAPIC: add APIC Timer periodic/oneshot mode VMX preemption timer support

Most windows guests still utilize APIC Timer periodic/oneshot mode
instead of tsc-deadline mode, and the APIC Timer periodic/oneshot
mode are still emulated by high overhead hrtimer on host. This patch
converts the expected expire time of the periodic/oneshot mode to
guest deadline tsc in order to leverage VMX preemption timer logic
for APIC Timer tsc-deadline mode. After each preemption timer vmexit
preemption timer is restarted to emulate LVTT current-count register
is automatically reloaded from the initial-count register when the
count reaches 0. This patch reduces ~5600 cycles for each APIC Timer
periodic mode operation virtualization.

Cc: Paolo Bonzini <[email protected]>
Cc: Radim Krčmář <[email protected]>
Cc: Yunhong Jiang <[email protected]>
Signed-off-by: Wanpeng Li <[email protected]>
[Squashed with my fixes that were reviewed-by Paolo.]
Signed-off-by: Radim Krčmář <[email protected]>