Merge branch kvm-arm64/pmu/reset-values into kvmarm-master/next

Fix the reset values for our PMU emulation. As a side effect,
it allows a nice optimisation by only tracking the in-use
counters when flipping them on and off, now that we are
guaranteed not to have any spurious bit set.

* kvm-arm64/pmu/reset-values:
  KVM: arm64: Remove PMSWINC_EL0 shadow register
  KVM: arm64: Disabling disabled PMU counters wastes a lot of time
  KVM: arm64: Drop unnecessary masking of PMU registers
  KVM: arm64: Narrow PMU sysreg reset values to architectural requirements

Signed-off-by: Marc Zyngier <maz@kernel.org>