Merge branch kvm-arm64/pkvm-allocator-7.4 into kvmarm-master/next

* kvm-arm64/pkvm-allocator-7.4: (21 commits)
  : \
  : Dynamic allocator for pKVM, courtesy of Vincent Donnefort.
  : From the cover letter:
  :
  : "pKVM historically lacked a dynamic memory allocator: all hypervisor-side
  : VM and VCPU structures had to be sized on the host, allocated as
  : contiguous pages and donated to the hypervisor.
  :
  : This design tightly coupled the hypervisor's memory footprint to
  : host-side constraints, complicated memory reclaim, and severely
  : restricted VM scalability.
  :
  : This patch series introduces a dynamically-mapped custom heap allocator
  : (hyp_allocator) to the pKVM hypervisor. The initial users are the
  : pkvm_hyp_vm and pkvm_hyp_vcpu structs, and the hypervisor tracing
  : metadata."
  : /
  KVM: arm64: Fix bpages backing allocation size in hyp_trace
  KVM: arm64: Prevent 64-bit overflow when computing hyp clock rate
  KVM: arm64: pkvm: Drop keneldoc markers for the allocator structs
  KVM: arm64: Alloc simple_buffer_page using pKVM hyp allocator
  KVM: arm64: Reject hyp trace descriptors with fewer than 3 pages
  KVM: arm64: Reject hyp trace descriptors with fewer CPUs than hyp_nr_cpus
  KVM: arm64: Rename vCPU pkvm_memcache to stage2_mc
  KVM: arm64: Alloc pkvm_hyp_vcpu using pKVM heap allocator
  KVM: arm64: Alloc pkvm_hyp_vm using pKVM heap allocator
  KVM: arm64: Move hyp_vm refcount into the structure
  KVM: arm64: Filter out non-kernel addresses in kern_hyp_va
  KVM: arm64: Add a shrinker for pKVM
  KVM: arm64: Add selftests for the pKVM heap allocator
  KVM: arm64: Add reclaim interface for the pKVM heap alloc
  KVM: arm64: Add PKVM_HYP_REQ_HYP_ALLOC request
  KVM: arm64: Add pkvm_hyp_req infrastructure
  KVM: arm64: Allow kvm_hyp_memcache usage outside of stage-2
  KVM: arm64: Add a heap allocator for the pKVM hyp
  KVM: arm64: Add pkvm_map_private_va_range
  KVM: arm64: Add pkvm_remove_mappings
  ...

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

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