kvm-4.4-1

handling.

PPC: Mostly bug fixes.

ARM: No big features, but many small fixes and prerequisites including:
- a number of fixes for the arch-timer
- introducing proper level-triggered semantics for the arch-timers
- a series of patches to synchronously halt a guest (prerequisite for
  IRQ forwarding)
- some tracepoint improvements
- a tweak for the EL2 panic handlers
- some more VGIC cleanups getting rid of redundant state

x86: quite a few changes:

- support for VT-d posted interrupts (i.e. PCI devices can inject
interrupts directly into vCPUs).  This introduces a new component (in
virt/lib/) that connects VFIO and KVM together.  The same infrastructure
will be used for ARM interrupt forwarding as well.

- more Hyper-V features, though the main one Hyper-V synthetic interrupt
controller will have to wait for 4.5.  These will let KVM expose Hyper-V
devices.

- nested virtualization now supports VPID (same as PCID but for vCPUs)
which makes it quite a bit faster

- for future hardware that supports NVDIMM, there is support for clflushopt,
clwb, pcommit

- support for "split irqchip", i.e. LAPIC in kernel + IOAPIC/PIC/PIT in
userspace, which reduces the attack surface of the hypervisor

- obligatory smattering of SMM fixes

- on the guest side, stable scheduler clock support was rewritten to not
require help from the hypervisor.