Re: [PATCH v2] x86/hvm: Remove callback from paging->flush_tlb() hook

["Durrant, Paul" <xadimgnik@xxxxxxxxx>]

On 18/11/2021 18:48, Andrew Cooper wrote:
> TLB flushing is a hotpath, and function pointer calls are
> expensive (especially under repoline) for what amounts to an identity
> transform on the data.  Just pass the vcpu_bitmap bitmap directly.
>
> As we use NULL for all rather than none, introduce a flush_vcpu() helper to
> avoid the risk of logical errors from opencoding the expression.  This also
> means the viridian callers can avoid writing an all-ones bitmap for the
> flushing logic to consume.
>
> No functional change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Paul Durrant <paul@xxxxxxx>