Re: [PATCH] KVM: VMX: Formally define KVM's "0xdead" exit reason used for failed VM-Enter

[Xiaoyao Li]

On 9/22/2026 7:56 AM, Sean Christopherson wrote:
> Add EXIT_REASON_UNDEFINED to track KVM's magic "0xdead" value that's used
> to stuff the exit reason on a failed VM-Enter so that the magic can be
> reused by TDX, and to make it more obvious that it's an arbitrary, KVM-
> defined value (though the whole "dead" thing makes it pretty darn obvious).
> 
> Opportunistically add a compile-time assert to ensure the KVM-defined exit
> reason never collides with a "real" exit reason.
> 
> No functional change intended.
> 
> Cc: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
> Cc: Yan Zhao <yan.y.zhao@xxxxxxxxx>
> Cc: Binbin Wu <binbin.wu@xxxxxxxxxxxxxxx>
> Cc: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Reviewed-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>