KVM: TDX: Avoid a double-KVM_BUG_ON() in tdx_sept_zap_private_spte()

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Return -EIO immediately from tdx_sept_zap_private_spte() if the number of
to-be-added pages underflows, so that the following "KVM_BUG_ON(err, kvm)"
isn't also triggered.  Isolating the check from the "is premap error"
if-statement will also allow adding a lockdep assertion that premap errors
are encountered if and only if slots_lock is held.

Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Kai Huang <kai.huang@intel.com>
Link: https://patch.msgid.link/20251030200951.3402865-14-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Sean Christopherson 2025-10-30 13:09:36 -07:00

parent b9d5cf6de0

commit 24adff3970

1 changed files with 4 additions and 2 deletions

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arch/x86/kvm/vmx/tdx.c

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