On 06/12/2014 04:00 PM, Mihai Caraman wrote:
On vcpu schedule, the condition checked for tlb pollution is too tight.
The tlb entries of one vcpu are polluted when a different vcpu from the
same partition runs in-between. Relax the current tlb invalidation
condition taking into account the lpid.
Signed-off-by: Mihai Caraman <mihai.caraman <at> freescale.com>
Your mailer is broken? :)
This really should be an @.
I think this should work. Scott, please ack.
Alex
Cc: Scott Wood <scottwood <at> freescale.com>
---
arch/powerpc/kvm/e500mc.c | 20 +++++++++++++++++---
1 file changed, 17 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
index 17e4562..2e0cd69 100644
--- a/arch/powerpc/kvm/e500mc.c
+++ b/arch/powerpc/kvm/e500mc.c
@@ -111,10 +111,12 @@ void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32
old_msr)
}
static DEFINE_PER_CPU(struct kvm_vcpu *, last_vcpu_on_cpu);
+static DEFINE_PER_CPU(int, last_lpid_on_cpu);
static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
+ bool update_last = false, inval_tlb = false;
kvmppc_booke_vcpu_load(vcpu, cpu);
@@ -140,12 +142,24 @@ static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
mtspr(SPRN_GESR, vcpu->arch.shared->esr);
- if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
- __get_cpu_var(last_vcpu_on_cpu) != vcpu) {
- kvmppc_e500_tlbil_all(vcpu_e500);
+ if (vcpu->arch.oldpir != mfspr(SPRN_PIR)) {
+ /* tlb entries deprecated */
+ inval_tlb = update_last = true;
+ } else if (__get_cpu_var(last_vcpu_on_cpu) != vcpu) {
+ update_last = true;
+ /* tlb entries polluted */
+ inval_tlb = __get_cpu_var(last_lpid_on_cpu) ==
+ vcpu->kvm->arch.lpid;
+ }
+
+ if (update_last) {
__get_cpu_var(last_vcpu_on_cpu) = vcpu;
+ __get_cpu_var(last_lpid_on_cpu) = vcpu->kvm->arch.lpid;
}
+ if (inval_tlb)
+ kvmppc_e500_tlbil_all(vcpu_e500);
+
kvmppc_load_guest_fp(vcpu);
}
--
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