What forms do I need to attach to an amended return?

I e-filed my 2017 return, then later received a 1099-R that indicated an adjustment to my taxable income.  When filing my amended return, do I need to attach ALL statements of income (W2s and 1099-Rs) to the 1040, or just the form that forced the amendment?  Does this answer hold true for state forms (Virginia) as well?