Re: [PATCH v7 07/10] x86/vmscape: Use static_call() for predictor flush

[bot+bpf-ci]

> diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
> index 68e2df3e3bf58..b75eda114503a 100644
> --- a/arch/x86/kernel/cpu/bugs.c
> +++ b/arch/x86/kernel/cpu/bugs.c
> @@ -144,6 +144,17 @@ EXPORT_SYMBOL_GPL(cpu_buf_idle_clear);
>   */
>  DEFINE_STATIC_KEY_FALSE(switch_mm_cond_l1d_flush);
>
> +/*
> + * Controls CPU Fill buffer clear before VMenter. This is a subset of
> + * X86_FEATURE_CLEAR_CPU_BUF, and should only be enabled when KVM-only
> + * mitigation is required.
> + */
> +DEFINE_STATIC_KEY_FALSE(cpu_buf_vm_clear);
> +EXPORT_SYMBOL_GPL(cpu_buf_vm_clear);

cpu_buf_vm_clear is defined and exported here but appears to have no
users. There is no declaration in any header, and nothing in this
patch series references it.

The comment describes CPU fill buffer clearing before VMenter, which
seems unrelated to the predictor flush static_call conversion that
this patch is doing. Was this included by mistake, or is it intended
for a follow-up series?

> +
> +DEFINE_STATIC_CALL_NULL(vmscape_predictor_flush, write_ibpb);
> +EXPORT_STATIC_CALL_GPL(vmscape_predictor_flush);

[ ... ]


---
AI reviewed your patch. Please fix the bug or email reply why it's not a bug.
See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md

CI run summary: https://github.com/kernel-patches/bpf/actions/runs/23303796353