KVM: x86/mmu: Drop KVM_BUG_ON() on shared lock to zap child external PTEs

Drop the KVM_BUG_ON() in the KVM MMU core before zapping child external
PTEs, since requiring zapping PTEs to be protected by exclusive mmu_lock is
TDX's specific requirement.

No need to plumb the shared/exclusive info into the remove_external_spte()
op or move the KVM_BUG_ON() to TDX, because
- There's already an assertion of exclusive mmu_lock protection in TDX.
- The KVM_BUG_ON() is a bit redundant given that if there's any bug causing
  zapping of leaf PTEs in S-EPT under shared mmu_lock, SEAMCALL failures
  due to contention would result in TDX_BUG_ON() in TDX.

Link: https://lore.kernel.org/kvm/aYUarHf3KEwHGuJe@google.com/
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Link: https://patch.msgid.link/20260509075647.4290-1-yan.y.zhao@intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions