[MODERATED] Re: [PATCH v7 01/10] TAAv7 1
Borislav Petkov <[email protected]>
| Newsgroups | org.kernel.lore.historical-speck |
|---|---|
| Message-ID | <[email protected]> |
On Tue, Oct 22, 2019 at 12:25:08PM -0500, speck for Josh Poimboeuf wrote:
> How is HLE unconditionally disabled? Is it done by the above mentioned
> microcode? Is there a way to enable it?
From patch 4:
" TSX_CTRL_CPUID_CLEAR clears the RTM enumeration in CPUID. The other
TSX sub-feature, Hardware Lock Elision (HLE), is unconditionally
disabled with updated microcode but still enumerated as present by
CPUID(EAX=7).EBX{bit4}."
Sounds like the microcode zaps it but leaves the CPUID bit on.
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Regards/Gruss,
Boris.
SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg
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