On 5/3/22 09:34, Peter Maydell wrote:
"set CONST on the cpreg" is what the code does, but it's not what the architecture wants. In particular, if the EL2 cpreg defines a non-zero resetvalue then the EL3-no-EL2 CPU will get a "reads as constant that value" rather than "reads as zero". CNTHCTL_EL2 and MDCR_EL2 are examples of this.
Ah, I'd missed those. I guess I need a third bit to indicate keeping the resetvalue, for e.g. VPIDR_EL2, which is why the code is written the way it is.
r~
