Re: [PATCH v3 09/10] x86/fpu/xstate: Introduce XFEATURE_MASK_KERNEL_DYNAMIC xfeature set

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On 3/9/2025 8:49 PM, Chao Gao wrote:

It was suggested by Sean [1].
...
> [1]: https://lore.kernel.org/kvm/ZTf5wPKXuHBQk0AN@xxxxxxxxxx/

But, you're defining a kernel "dynamic" feature while introducing a
"guest-only" xfeature concept. Both seem to be mixed together with this
patch. Why not call it as a guest-only feature? That's what Sean was
suggesting, no?

"I would much prefer to avoid the whole "dynamic" thing and instead make CET explicitly guest-only. E.g. fpu_kernel_guest_only_xfeatures? Or even better if it doesn't cause weirdness elsewhere, a dedicated fpu_guest_cfg. For me at least, a fpu_guest_cfg would make it easier to understand what all is going on."

Thanks,
Chang




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