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authorHollis Blanchard <hollisb@us.ibm.com>2008-12-02 15:51:54 -0600
committerAvi Kivity <avi@redhat.com>2008-12-31 16:55:09 +0200
commitc0ca609c5f874f7d6ae8e180afe79317e1943d22 (patch)
tree45490ee3f3a16a220a554c8bcf40530253fc6be0 /arch/powerpc
parent891686188f69d330f7eeeec8e6642ccfb7453106 (diff)
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@us.ibm.com> Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/include/asm/mmu-44x.h1
1 files changed, 1 insertions, 0 deletions
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;