[RESEND v3 0/3] Fix __pkvm_init_vm error path

[Vincent Donnefort <vdonnefort@google.com>]

Sashiko reported a potential refcount leak in the unlikely case where
insert_vm_table_entry fails.

While at it, I have added a fail-safe to __pkvm_hyp_donate_host to ensure this
function doesn't allow leaking refcounted pages.

Changes since v3:
 
  * Enforce order-0 for external pages, making the vmemmap ->order field
    completely private to hyp_pool.

Changes since v2 (https://lore.kernel.org/all/20260521102149.804874-1-vdonnefort@google.com/):
  
  * Proactively init hyp_page order field in hyp_pool_init  

v1 (https://lore.kernel.org/all/20260521081250.655226-1-vdonnefort@google.com/)


Vincent Donnefort (3):
  KVM: arm64: Reset page order in pKVM hyp_pool
  KVM: arm64: Fix __pkvm_init_vm error path
  KVM: arm64: Add fail-safe for refcounted pages in
    __pkvm_hyp_donate_host

 arch/arm64/kvm/hyp/include/nvhe/mem_protect.h |  1 +
 arch/arm64/kvm/hyp/nvhe/mem_protect.c         | 35 +++++++++++++------
 arch/arm64/kvm/hyp/nvhe/page_alloc.c          | 21 ++++++++---
 arch/arm64/kvm/hyp/nvhe/pkvm.c                |  4 ++-
 4 files changed, 45 insertions(+), 16 deletions(-)


base-commit: 5200f5f493f79f14bbdc349e402a40dfb32f23c8
-- 
2.54.0.746.g67dd491aae-goog