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    KVM: VMX: remove bogus WARN_ON in handle_ept_misconfig · c75d0edc
    Sean Christopherson 提交于
    Remove the WARN_ON in handle_ept_misconfig() as it is unnecessary
    and causes false positives.  Return the unmodified result of
    kvm_mmu_page_fault() instead of converting a system error code to
    KVM_EXIT_UNKNOWN so that userspace sees the error code of the
    actual failure, not a generic "we don't know what went wrong".
    
      * kvm_mmu_page_fault() will WARN if reserved bits are set in the
        SPTEs, i.e. it covers the case where an EPT misconfig occurred
        because of a KVM bug.
    
      * The WARN_ON will fire on any system error code that is hit while
        handling the fault, e.g. -ENOMEM from mmu_topup_memory_caches()
        while handling a legitmate MMIO EPT misconfig or -EFAULT from
        kvm_handle_bad_page() if the corresponding HVA is invalid.  In
        either case, userspace should receive the original error code
        and firing a warning is incorrect behavior as KVM is operating
        as designed.
    Signed-off-by: NSean Christopherson <sean.j.christopherson@intel.com>
    Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
    c75d0edc
vmx.c 361.4 KB