- Copy stable/10@285827 to releng/10.2 in preparation for 10.2-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.2.
- Update default pkg(8) configuration to use the quarterly branch.[1]

Discussed with: re, portmgr [1]
Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC 262139,262140,262236,262281,262532:
Various x2APIC fixes and enhancements:
- Use spinlocks for the vioapic.
- Handle the SELF_IPI MSR.
- Simplify the APIC mode switching between MMIO and x2APIC. The guest is
no longer allowed to switch modes at runtime. Instead, the desired mode
is set when the virtual machine is created.
- Disallow MMIO access in x2APIC mode and MSR access in xAPIC mode.
- Add support for x2APIC virtualization assist in Intel VT-x.

MFC 259641,259863,259924,259937,259961,259978,260380,260383,260410,260466,
260531,260532,260550,260619,261170,261453,261621,263280,263290,264516:
Add support for local APIC hardware-assist.
- Restructure vlapic access and register handling to support hardware-assist
for the local APIC.
- Use the 'Virtual Interrupt Delivery' and 'Posted Interrupt Processing'
feature of Intel VT-x if supported by hardware.
- Add an API to rendezvous all active vcpus in a virtual machine and use
it to support level triggered interrupts with VT-x 'Virtual Interrupt
Delivery'.
- Use a cheaper IPI handler than IPI_AST for nested page table shootdowns
and avoid doing unnecessary nested TLB invalidations.

Reviewed by: neel

vlapic code restructuring to make it easy to support hardware-assist for APIC
emulation.

The vlapic initialization and cleanup is done via processor specific vmm_ops.
This will allow the VT-x/SVM modules to layer any hardware-assist for APIC
emulation or virtual interrupt delivery on top of the vlapic device model.

Add a parameter to 'vcpu_notify_event()' to distinguish between vlapic
interrupts versus other events (e.g. NMI). This provides an opportunity to
use hardware-assists like Posted Interrupts (VT-x) or doorbell MSR (SVM)
to deliver an interrupt to a guest without causing a VM-exit.

Get rid of lapic_pending_intr() and lapic_intr_accepted() and use the
vlapic_xxx() counterparts directly.

Associate an 'Apic Page' with each vcpu and reference it from the 'vlapic'.
The 'Apic Page' is intended to be referenced from the Intel VMCS as the
'virtual APIC page' or from the AMD VMCB as the 'vAPIC backing page'.