Merge branch kvm-arm64/pkvm-memshare-declutter into kvmarm-master/next

* kvm-arm64/pkvm-memshare-declutter:
  : .
  : pKVM memory transition simplifications, courtesy of Quentin Perret.
  :
  : From the cover letter:
  : "Since its early days, pKVM has formalized memory 'transitions' (shares
  : and donations) using 'struct pkvm_mem_transition' and bunch of helpers
  : to manipulate it. The intention was for all transitions to use this
  : machinery to ensure we're checking things consistently. However, as
  : development progressed, it became clear that the rigidity of this model
  : made it really difficult to use in some use-cases which ended-up
  : side-stepping it entirely. That is the case for the
  : hyp_{un}pin_shared_mem() and host_{un}share_guest() paths upstream which
  : use lower level helpers directly, as well as for several other pKVM
  : features that should land upstream in the future (ex: when a guest
  : relinquishes a page during ballooning, when annotating a page that is
  : being DMA'd to, ...). On top of this, the pkvm_mem_transition machinery
  : requires a lot of boilerplate which makes the code hard to read, but
  : also adds layers of indirection that no compilers seems to see through,
  : hence leading to suboptimal generated code.
  :
  : Given all the above, this series removes the pkvm_mem_transition
  : machinery from mem_protect.c, and converts all its users to use
  : __*_{check,set}_page_state_range() low-level helpers directly."
  : .
  KVM: arm64: Drop pkvm_mem_transition for host/hyp donations
  KVM: arm64: Drop pkvm_mem_transition for host/hyp sharing
  KVM: arm64: Drop pkvm_mem_transition for FF-A
  KVM: arm64: Only apply PMCR_EL0.P to the guest range of counters
  KVM: arm64: nv: Reload PMU events upon MDCR_EL2.HPME change
  KVM: arm64: Use KVM_REQ_RELOAD_PMU to handle PMCR_EL0.E change
  KVM: arm64: Add unified helper for reprogramming counters by mask
  KVM: arm64: Always check the state from hyp_ack_unshare()
  KVM: arm64: Fix set_id_regs selftest for ASIDBITS becoming unwritable

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