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authorMarc Zyngier <marc.zyngier@arm.com>2015-03-12 18:16:51 +0000
committerChristoffer Dall <christoffer.dall@linaro.org>2015-03-12 22:34:43 +0100
commit35307b9a5f7ebcc8d8db41c73b69c131b48ace2b (patch)
tree42cf3a7b7177139fe59d764893e0556487b5ba72 /arch/arm/kvm/trace.h
parent1d2ebaccc741a299abfafb848414b01d190f4e33 (diff)
arm/arm64: KVM: Implement Stage-2 page aging
Until now, KVM/arm didn't care much for page aging (who was swapping anyway?), and simply provided empty hooks to the core KVM code. With server-type systems now being available, things are quite different. This patch implements very simple support for page aging, by clearing the Access flag in the Stage-2 page tables. On access fault, the current fault handling will write the PTE or PMD again, putting the Access flag back on. It should be possible to implement a much faster handling for Access faults, but that's left for a later patch. With this in place, performance in VMs is degraded much more gracefully. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm/kvm/trace.h')
-rw-r--r--arch/arm/kvm/trace.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/kvm/trace.h b/arch/arm/kvm/trace.h
index 6817664b46b8..c09f37faff01 100644
--- a/arch/arm/kvm/trace.h
+++ b/arch/arm/kvm/trace.h
@@ -210,6 +210,39 @@ TRACE_EVENT(kvm_set_spte_hva,
TP_printk("mmu notifier set pte hva: %#08lx", __entry->hva)
);
+TRACE_EVENT(kvm_age_hva,
+ TP_PROTO(unsigned long start, unsigned long end),
+ TP_ARGS(start, end),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, start )
+ __field( unsigned long, end )
+ ),
+
+ TP_fast_assign(
+ __entry->start = start;
+ __entry->end = end;
+ ),
+
+ TP_printk("mmu notifier age hva: %#08lx -- %#08lx",
+ __entry->start, __entry->end)
+);
+
+TRACE_EVENT(kvm_test_age_hva,
+ TP_PROTO(unsigned long hva),
+ TP_ARGS(hva),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, hva )
+ ),
+
+ TP_fast_assign(
+ __entry->hva = hva;
+ ),
+
+ TP_printk("mmu notifier test age hva: %#08lx", __entry->hva)
+);
+
TRACE_EVENT(kvm_hvc,
TP_PROTO(unsigned long vcpu_pc, unsigned long r0, unsigned long imm),
TP_ARGS(vcpu_pc, r0, imm),