Re: [PATCH 2/3] x86/mmio: Rename cpu_buf_vm_clear to cpu_buf_vm_clear_mmio_only

[Sean Christopherson]

On Wed, Oct 29, 2025, Pawan Gupta wrote:
> cpu_buf_vm_clear static key is only used by the MMIO Stale Data mitigation.
> Rename it to avoid mixing it up with X86_FEATURE_CLEAR_CPU_BUF_VM.
> 
> Signed-off-by: Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>
> ---

...

> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index f87c216d976d7d344c924aa4cc18fe1bf8f9b731..451be757b3d1b2fec6b2b79157f26dd43bc368b8 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -903,7 +903,7 @@ unsigned int __vmx_vcpu_run_flags(struct vcpu_vmx *vmx)
>  	if (!msr_write_intercepted(vmx, MSR_IA32_SPEC_CTRL))
>  		flags |= VMX_RUN_SAVE_SPEC_CTRL;
>  
> -	if (static_branch_unlikely(&cpu_buf_vm_clear) &&
> +	if (static_branch_unlikely(&cpu_buf_vm_clear_mmio_only) &&
>  	    kvm_vcpu_can_access_host_mmio(&vmx->vcpu))
>  		flags |= VMX_RUN_CLEAR_CPU_BUFFERS_FOR_MMIO;

The use in vmx_vcpu_enter_exit() needs to be renamed as well.  The code gets
dropped in patch 3, but intermediate builds will fail.