KVM: ppc: adds trace points for ppc tlb activity

This patch adds trace points to track powerpc TLB activities using the
KVM_TRACE infrastructure.

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

3 files changed, 21 insertions, 1 deletions

diff --git a/arch/powerpc/kvm/44x_tlb.c b/arch/powerpc/kvm/44x_tlb.c
index 5a5602da5091..a207d16b9dbb 100644
--- a/arch/powerpc/kvm/44x_tlb.c
+++ b/arch/powerpc/kvm/44x_tlb.c
@@ -19,6 +19,7 @@
 
 #include <linux/types.h>
 #include <linux/string.h>
+#include <linux/kvm.h>
 #include <linux/kvm_host.h>
 #include <linux/highmem.h>
 #include <asm/mmu-44x.h>
@@ -175,6 +176,10 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn, u64 asid,
         stlbe->word1 = (hpaddr & 0xfffffc00) | ((hpaddr >> 32) & 0xf);
         stlbe->word2 = kvmppc_44x_tlb_shadow_attrib(flags,
                                                     vcpu->arch.msr & MSR_PR);
+
+        KVMTRACE_5D(STLB_WRITE, vcpu, victim,
+                        stlbe->tid, stlbe->word0, stlbe->word1, stlbe->word2,
+                        handler);
 }
 
 void kvmppc_mmu_invalidate(struct kvm_vcpu *vcpu, gva_t eaddr,
@@ -204,6 +209,9 @@ void kvmppc_mmu_invalidate(struct kvm_vcpu *vcpu, gva_t eaddr,
 
                 kvmppc_44x_shadow_release(vcpu, i);
                 stlbe->word0 = 0;
+                KVMTRACE_5D(STLB_INVAL, vcpu, i,
+                                stlbe->tid, stlbe->word0, stlbe->word1,
+                                stlbe->word2, handler);
         }
         up_write(&current->mm->mmap_sem);
 }
@@ -217,8 +225,13 @@ void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode)
         /* XXX Replace loop with fancy data structures. */
         down_write(&current->mm->mmap_sem);
         for (i = 0; i <= tlb_44x_hwater; i++) {
+                struct tlbe *stlbe = &vcpu->arch.shadow_tlb[i];
+
                 kvmppc_44x_shadow_release(vcpu, i);
-                vcpu->arch.shadow_tlb[i].word0 = 0;
+                stlbe->word0 = 0;
+                KVMTRACE_5D(STLB_INVAL, vcpu, i,
+                                stlbe->tid, stlbe->word0, stlbe->word1,
+                                stlbe->word2, handler);
         }
         up_write(&current->mm->mmap_sem);
 }
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 8c605d0a5488..4a3e274bac12 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -170,6 +170,10 @@ static int kvmppc_emul_tlbwe(struct kvm_vcpu *vcpu, u32 inst)
                 kvmppc_mmu_map(vcpu, eaddr, raddr >> PAGE_SHIFT, asid, flags);
         }
 
+        KVMTRACE_5D(GTLB_WRITE, vcpu, index,
+                        tlbe->tid, tlbe->word0, tlbe->word1, tlbe->word2,
+                        handler);
+
         return EMULATE_DONE;
 }
 
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 5d08f11bb27f..e21a5050d4d6 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -471,5 +471,8 @@ struct kvm_trace_rec {
 #define KVM_TRC_LMSW             (KVM_TRC_HANDLER + 0x13)
 #define KVM_TRC_APIC_ACCESS      (KVM_TRC_HANDLER + 0x14)
 #define KVM_TRC_TDP_FAULT        (KVM_TRC_HANDLER + 0x15)
+#define KVM_TRC_GTLB_WRITE       (KVM_TRC_HANDLER + 0x16)
+#define KVM_TRC_STLB_WRITE       (KVM_TRC_HANDLER + 0x17)
+#define KVM_TRC_STLB_INVAL       (KVM_TRC_HANDLER + 0x18)
 
 #endif