Jeff Garzik wrote:
MSR instructions cannot execute out of userspace, but the MSR driver
might be possible to use. It's usually quite slow, however.
MSRs are used for setup, not for actual data.
Intel: magic MMIO address (readb)
AMD: magic PIO address (inl)
VIA: CPU instruction ('xstore')
For setup, the MSR driver is fine.
-hpa
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