On Fri, 31 Oct 2008 14:03:12 -0500
Hollis Blanchard <hollisb@xxxxxxxxxx> wrote:
> # HG changeset patch
> # User Hollis Blanchard <hollisb@xxxxxxxxxx>
> # Date 1225479768 18000
> # Node ID 59bd162a744af080479fedffa97d01e26dceee6a
> # Parent 635f3f74befc230d93f79dc3198c509394247ee8
> powerpc/44x: declare tlb_44x_index for use in C code
>
> KVM currently ignores the host's round robin TLB eviction selection, instead
> maintaining its own TLB state and its own round robin index. However, by
> participating in the normal 44x TLB selection, we can drop the alternate TLB
> processing in KVM. This results in a significant performance improvement,
> since that processing currently must be done on *every* guest exit.
>
> Accordingly, KVM needs to be able to access and increment tlb_44x_index.
> (KVM on 440 cannot be a module, so there is no need to export this symbol.)
>
> Signed-off-by: Hollis Blanchard <hollisb@xxxxxxxxxx>
Acked-by: Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxxx>
>
> ---
>
> Josh, can I get your ack? I'll submit through the KVM tree as usual.
>
> diff --git a/arch/powerpc/include/asm/mmu-44x.h b/arch/powerpc/include/asm/mmu-44x.h
> --- a/arch/powerpc/include/asm/mmu-44x.h
> +++ b/arch/powerpc/include/asm/mmu-44x.h
> @@ -54,6 +54,7 @@
> #ifndef __ASSEMBLY__
>
> extern unsigned int tlb_44x_hwater;
> +extern unsigned int tlb_44x_index;
>
> typedef struct {
> unsigned long id;
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