From c0ca609c5f874f7d6ae8e180afe79317e1943d22 Mon Sep 17 00:00:00 2001 From: Hollis Blanchard Date: Tue, 2 Dec 2008 15:51:54 -0600 Subject: 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 Acked-by: Josh Boyer Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/mmu-44x.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/powerpc/include/asm') diff --git a/arch/powerpc/include/asm/mmu-44x.h b/arch/powerpc/include/asm/mmu-44x.h index 8a97cfb08b7..27cc6fdcd3b 100644 --- a/arch/powerpc/include/asm/mmu-44x.h +++ b/arch/powerpc/include/asm/mmu-44x.h @@ -56,6 +56,7 @@ #ifndef __ASSEMBLY__ extern unsigned int tlb_44x_hwater; +extern unsigned int tlb_44x_index; typedef struct { unsigned int id; -- cgit v1.2.3