Andi Kleen wrote:
HOWEVER -- and this is where things get gnarly -- the CPUID and MSR
drivers would really like to be able to execute CPUID, WRMSR and RDMSR
with the entire GPR register set (except the stack pointer) pre-set and
post-captured, since it's highly likely that there are going to be
nonstandard MSRs and CPUID levels (already witness Intel breaking the
CPUID architecture by introducing %ecx dependencies.)
That looks like such a specialized requirement that I would suggest
you keep that in the drivers. The interface for most users would be just
too ugly
It would, but rather than having the paravirtualization interfaces
duplicate out of control, we could/should implement the less generic
features in terms of the more generic, above the pvz layer.
-hpa
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