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https://software.intel.com/en-us/blogs/2012/11/17/the-difference-between-rdrand-and-rdseed
Nov 17, 2012 · Intel recently announced the addition of the RDSEED instruction to the Intel® 64 and IA-32 Architectures. An addition to Intel® Secure Key, this new instruction will appear in future generations of Intel processors. Like RDRAND the RDSEED instruction returns random numbers, and with two instructions that appear to do the same thing it is only natural for the software developer to ask, …
The only way to easily access Intel's new Secure Key techonology in your application - introducing the JebteK RdRand library. As a developer, you can use it any way you like - as a library in your application with the purchase of a license, or as a cloud-based secure RESTful service.
https://www.felixcloutier.com/x86/rdrand
Software must check the state of CF=1 for determining if a valid random value has been returned, otherwise it is expected to loop and retry execution of RDRAND (see Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1, Section 7.3.17, “Random Number Generator Instructions”).
https://www.phoronix.com/scan.php?page=news_item&px=AMD-RdRand-Disable-15h-16h
Aug 15, 2019 · The RdRand instruction will still work on capable CPUs, but the CPU ID bit is being cleared so that it won't be advertised for software explicitly checking for the support. Tom Lendacky of AMD resorted to clearing the RDRAND CPU ID bit for 15h/16h processors (no impact for Zen, etc) due to RdRand issues cropping up after suspend/resume.
http://lkml.iu.edu/hypermail/linux/kernel/1908.1/07588.html?anzwix=print
MSR C001_1004 value to ensure that the RDRAND CPUID setting remains in place after resuming from suspend. Note, that clearing the RDRAND CPUID bit does not prevent a processor that normally supports the RDRAND instruction from executing the RDRAND instruction. So any code that determined the support based on family and model won't #UD.
https://stackoverflow.com/questions/35352915/qemu-rdrand-instruction-not-supported
I am trying to run a custom kernel in qemu-system-x86_64. This kernel requires the usage of the rdrand instruction early in its boot cycle, and will fail to boot if it is not supported by the CPU. ...
https://codereview.stackexchange.com/questions/147656/checking-if-cpu-supports-rdrand/150230
Checking if CPU supports rdrand. Ask Question Asked 3 years ago. ... All CPUs that support the CPUID instruction support at least function/level 1, ... executing only an RDRAND instruction. If you did need to fall back to inline assembly for RDRAND, hopefully you know how to do it correctly now. Notice that we need to use the cc clobber, ...
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