Andriy Gapon wrote:
on 17/05/2008 18:37 Rui Paulo said the following:
Andriy Gapon wrote:
It seems that rdmsr instruction can be executed only at the highest
privilege level and thus is not permitted from userland. Maybe we
should provide something like Linux /dev/cpu/msr?
I don't like interface of that device, I think that ioctl approach
would be preferable in this case.
Something like create /dev/cpuN and allow some ioctls on it:
ioctl(cpu_fd, CPU_RDMSR, arg).
What do you think?
While I think this (devcpu) is good for testing and development, I
prefer having a device driver to handle that specific MSR than a
generic /dev/cpuN where you can issue MSRs.
Both for security and reliability reasons.
What about /dev/pci, /dev/io? Aren't they a precedent?
They are, but, IMHO, we should no longer continue to create this type of
interfaces.
Regards,
--
Rui Paulo
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