Messages in this thread | | | From | "Luck, Tony" <> | Subject | RE: [PATCH] x86: also disable FSRM if ERMS is disabled | Date | Tue, 11 Oct 2022 17:09:19 +0000 |
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>> The Intel SDM says: "Software can disable fast-string operation by >> clearing the fast-string-enable bit (bit 0) of IA32_MISC_ENABLE MSR", >> so it's not an invalid configuration for this bit to be unset. > > Dunno, did Intel folks think about clearing the respective CPUID bits > when exposing IA32_MISC_ENABLE[0] to software? Tony?
I don't know if it was thought about. Experimentally clearing bit 0 of IA32_MISC_ENABLE does not affect the CPUID bit settings for either ERMS or FSRM (on the one system I tried that supports both of these bits).
-Tony
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