KVM: ppc: Stop saving host TLB state

We're saving the host TLB state to memory on every exit, but never using it.
Originally I had thought that we'd want to restore host TLB for heavyweight
exits, but that could actually hurt when context switching to an unrelated host
process (i.e. not qemu).

Since this decreases the performance penalty of all exits, this patch improves
guest boot time by about 15%.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 23bad40b0ea6..dc3a7562bae4 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -81,8 +81,6 @@ struct kvm_vcpu_arch {
         struct tlbe shadow_tlb[PPC44x_TLB_SIZE];
         /* Pages which are referenced in the shadow TLB. */
         struct page *shadow_pages[PPC44x_TLB_SIZE];
-        /* Copy of the host's TLB. */
-        struct tlbe host_tlb[PPC44x_TLB_SIZE];
 
         u32 host_stack;
         u32 host_pid;