Re: [PATCH v4 1/8] x86/bugs: Use VM_CLEAR_CPU_BUFFERS in VMX as well

[Borislav Petkov]

On Tue, Nov 11, 2025 at 02:03:40PM -0800, Sean Christopherson wrote:
> How about:
> 
> /* If necessary, emit VERW on exit-to-userspace to clear CPU buffers. */
> #define CLEAR_CPU_BUFFERS \
> 	ALTERNATIVE "", __CLEAR_CPU_BUFFERS, X86_FEATURE_CLEAR_CPU_BUF

By the "If necessary" you mean whether X86_FEATURE_CLEAR_CPU_BUF is set or
not, I presume...

I was just wondering whether this macro is going to be used somewhere else
*except* on the kernel->user vector.

> Ya, and this goes away (moved into SVM) by the end of the series.

Aha, lemme look at the rest too then.

Thx.

-- 
Regards/Gruss,
    Boris.

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