KVM: Add trace_kvm_vm_set_mem_attributes()

Add a tracing function that, for a guest memory range, displays
the start and end addresses plus the per-page attributes being set.

Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Link: https://lore.kernel.org/r/20250609091121.2497429-3-liam.merwick@oracle.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

include/trace/events/kvm.h

@@ -473,6 +473,33 @@ TRACE_EVENT(kvm_dirty_ring_exit,
 	TP_printk("vcpu %d", __entry->vcpu_id)
 );
 
+#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
+/*
+ * @start:	Starting address of guest memory range
+ * @end:	End address of guest memory range
+ * @attr:	The value of the attribute being set.
+ */
+TRACE_EVENT(kvm_vm_set_mem_attributes,
+	TP_PROTO(gfn_t start, gfn_t end, unsigned long attr),
+	TP_ARGS(start, end, attr),
+
+	TP_STRUCT__entry(
+		__field(gfn_t,		start)
+		__field(gfn_t,		end)
+		__field(unsigned long,	attr)
+	),
+
+	TP_fast_assign(
+		__entry->start		= start;
+		__entry->end		= end;
+		__entry->attr		= attr;
+	),
+
+	TP_printk("%#016llx -- %#016llx [0x%lx]",
+		  __entry->start, __entry->end, __entry->attr)
+);
+#endif /* CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES */
+
 TRACE_EVENT(kvm_unmap_hva_range,
 	TP_PROTO(unsigned long start, unsigned long end),
 	TP_ARGS(start, end),

virt/kvm/kvm_main.c

@@ -2558,6 +2558,8 @@ static int kvm_vm_set_mem_attributes(struct kvm *kvm, gfn_t start, gfn_t end,
 
 	entry = attributes ? xa_mk_value(attributes) : NULL;
 
+	trace_kvm_vm_set_mem_attributes(start, end, attributes);
+
 	mutex_lock(&kvm->slots_lock);
 
 	/* Nothing to do if the entire range as the desired attributes. */