Re: [PATCH v13 04/21] KVM: pfncache: add a mark-dirty helper

[Sean Christopherson]

On Thu, Feb 15, 2024, Paul Durrant wrote:
> +/**
> + * kvm_gpc_mark_dirty_in_slot - mark a cached guest page as dirty.
> + *
> + * @gpc:	   struct gfn_to_pfn_cache object.

Meh, just omit the kerneldoc comment.  

> + */
> +static inline void kvm_gpc_mark_dirty_in_slot(struct gfn_to_pfn_cache *gpc)
> +{
> +	lockdep_assert_held(&gpc->lock);
> +	if (gpc->memslot)
> +		mark_page_dirty_in_slot(gpc->kvm, gpc->memslot,
> +					gpc->gpa >> PAGE_SHIFT);

It's kinda silly, but I think it's worth landing this below gpa_to_gfn() so that
there's no need to open code the shift.

And I have a (very) slight preference for an early return.

static inline void kvm_gpc_mark_dirty_in_slot(struct gfn_to_pfn_cache *gpc)
{
	lockdep_assert_held(&gpc->lock);

	if (!gpc->memslot)
		return;

	mark_page_dirty_in_slot(gpc->kvm, gpc->memslot, gpa_to_gfn(gpc->gpa));
}

> +}
> +
>  void kvm_sigset_activate(struct kvm_vcpu *vcpu);
>  void kvm_sigset_deactivate(struct kvm_vcpu *vcpu);
>  
> -- 
> 2.39.2
>