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Return `-EBUSY` from tdx_mcall_get_report0() when `TDG.MR.REPORT` returns `TDCALL_OPERAND_BUSY`. This enables the caller to retry obtaining a TDREPORT later if another VCPU is extending an RTMR concurrently. Signed-off-by: Cedric Xing <cedric.xing@intel.com> Acked-by: Dionna Amalie Glaze <dionnaglaze@google.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://patch.msgid.link/20250506-tdx-rtmr-v6-4-ac6ff5e9d58a@intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>