[PATCH 17/18] KVM: Introduce traces to track memory attributes modification.

Nicolas Saenz Julienne
2024-06-09T15:59:09Z

Introduce traces that track memory attributes modification.

Signed-off-by: Nicolas Saenz Julienne <nsaenz@amazon.com>
---
include/trace/events/kvm.h | 20 ++++++++++++++++++++
virt/kvm/kvm_main.c | 2 ++
2 files changed, 22 insertions(+)

diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
index 74e40d5d4af42..aa6caeb16f12a 100644
--- a/include/trace/events/kvm.h
+++ b/include/trace/events/kvm.h
@@ -489,6 +489,26 @@ TRACE_EVENT(kvm_test_age_hva,
TP_printk("mmu notifier test age hva: %#016lx", __entry->hva)
);

+TRACE_EVENT(kvm_vm_set_mem_attributes,
+ TP_PROTO(u64 start, u64 cnt, u64 attributes),
+ TP_ARGS(start, cnt, attributes),
+
+ TP_STRUCT__entry(
+ __field( u64, start )
+ __field( u64, cnt )
+ __field( u64, attributes )
+ ),
+
+ TP_fast_assign(
+ __entry->start = start;
+ __entry->cnt = cnt;
+ __entry->attributes = attributes;
+ ),
+
+ TP_printk("gfn 0x%llx, cnt 0x%llx, attributes 0x%llx",
+ __entry->start, __entry->cnt, __entry->attributes)
+);
+
#endif /* _TRACE_KVM_MAIN_H */

/* This part must be outside protection */
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index bd27fc01e9715..1c493ece3deb1 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2556,6 +2556,8 @@ static int kvm_vm_set_mem_attributes(struct kvm *kvm, gfn_t start, gfn_t end,

kvm_handle_gfn_range(kvm, &post_set_range);

+ trace_kvm_vm_set_mem_attributes(start, end - start, attributes);
+
out_unlock:
mutex_unlock(&kvm->slots_lock);

--
2.40.1