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Convert TDG.VP.VMCALL<ReportFatalError> to KVM_EXIT_SYSTEM_EVENT with a new type KVM_SYSTEM_EVENT_TDX_FATAL and forward it to userspace for handling. TD guest can use TDG.VP.VMCALL<ReportFatalError> to report the fatal error it has experienced. This hypercall is special because TD guest is requesting a termination with the error information, KVM needs to forward the hypercall to userspace anyway, KVM doesn't do parsing or conversion, it just dumps the 16 general-purpose registers to userspace and let userspace decide what to do. Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com> Message-ID: <20250222014225.897298-8-binbin.wu@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>