On 6/3/2025 9:34 AM, Xin Li wrote: > On 5/13/2025 1:37 PM, Sohil Mehta wrote: >> Prior to NMI-source support, the vector information was ignored by the >> hardware while delivering NMIs. With NMI-source, the architecture >> currently supports a 16-bit source bitmap to identify the source of the >> NMI. Upon receiving an NMI, this bitmap is delivered as part of the FRED >> event delivery mechanism to the kernel. >> >> Assign a vector space of 0-15 that is specific to NMI-source and >> independent of the IDT vector space of 0-255. Being a bitmap, the >> NMI-source vectors do not have any inherent priority associated with >> them. The order of executing the NMI handlers is up to the kernel. > > I'm thinking should we mention that the bitmap could be extended more > than 16 bits in future? Or we just don't emphasize 16-bit or 0~15? > That was mainly to justify the value of NMIS_VECTORS_MAX defined in this patch. I will include a sentence to mention that the bitmap size could be extended in the future. We could even set NMIS_VECTORS_MAX to 64 right now to make this future-proof. Though in practice, I don't see it happening any time soon. Sohil
