Messages in this thread | | | Date | Mon, 18 Sep 2023 15:16:48 +0800 | Subject | Re: [PATCH v6 01/25] x86/fpu/xstate: Manually check and add XFEATURE_CET_USER xstate bit | From | "Yang, Weijiang" <> |
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On 9/16/2023 12:35 AM, Edgecombe, Rick P wrote: > On Fri, 2023-09-15 at 10:32 +0800, Yang, Weijiang wrote: >>> Also, this doesn't discuss the real main reason for this patch, and >>> that is that KVM will soon use the xfeature for user ibt, and so >>> there >>> will now be a reason to have XFEATURE_CET_USER depend on IBT. >> This is one justification for Linux OS, another reason is there's >> non-Linux >> OS which is using the user IBT feature. I should make the reasons >> clearer >> in changelog, thanks for pointing it out! > The point I was trying to make was today (before this series) nothing > on the system can use user IBT. Not the host, and not in any guest > because KVM doesn't support it. So the added xfeature dependency on IBT > was not previously needed. It is being added only for KVM CET support > (which, yes, may run on guests with non-standard CPUID).
Agree, I'll highlight this in changelog, thanks!
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