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authorHollis Blanchard <hollisb@us.ibm.com>2008-07-25 13:54:53 -0500
committerAvi Kivity <avi@qumranet.com>2008-10-15 10:15:16 +0200
commit49dd2c492895828a90ecdf889e7fe9cfb40a82a7 (patch)
tree63b5f85b0ed5a94c8265d86dda4db262b00adf95 /arch/powerpc/kvm/booke_interrupts.S
parent83aae4a8098eb8a40a2e9dab3714354182143b4f (diff)
KVM: powerpc: Map guest userspace with TID=0 mappings
When we use TID=N userspace mappings, we must ensure that kernel mappings have been destroyed when entering userspace. Using TID=1/TID=0 for kernel/user mappings and running userspace with PID=0 means that userspace can't access the kernel mappings, but the kernel can directly access userspace. The net is that we don't need to flush the TLB on privilege switches, but we do on guest context switches (which are far more infrequent). Guest boot time performance improvement: about 30%. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/powerpc/kvm/booke_interrupts.S')
-rw-r--r--arch/powerpc/kvm/booke_interrupts.S2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/booke_interrupts.S b/arch/powerpc/kvm/booke_interrupts.S
index 564ea32ecba..95e165baf85 100644
--- a/arch/powerpc/kvm/booke_interrupts.S
+++ b/arch/powerpc/kvm/booke_interrupts.S
@@ -332,7 +332,7 @@ lightweight_exit:
mfspr r3, SPRN_PID
stw r3, VCPU_HOST_PID(r4)
- lwz r3, VCPU_PID(r4)
+ lwz r3, VCPU_SHADOW_PID(r4)
mtspr SPRN_PID, r3
/* Prevent all asynchronous TLB updates. */