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>

diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
index fc7d0f8ff078828c726b4c0d8c66f7cbf82f0e80..40b20d682d47617e32e330e9a82e1c2b32a18184 100644 (file)
--- a/include/trace/events/kvm.h
+++ b/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),

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index eec82775c5bfbe50f3aa955b08e6e113396e856a..af69b1e24f403ba6ba78126b937d2471ca31d05e 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/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. */