[Qemu-devel] [PATCH qemu] kvm: Add kvm_set_user_memory tracepoint

[Alexey Kardashevskiy]

This adds a tracepoint to trace the KVM_SET_USER_MEMORY_REGION ioctl
parameters which is quite useful for debugging VFIO memory regions
being actually registered with KVM.

Signed-off-by: Alexey Kardashevskiy <address@hidden>
---
 accel/kvm/kvm-all.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index f290f48..b91fcb7 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -235,6 +235,7 @@ static int kvm_set_user_memory_region(KVMMemoryListener 
*kml, KVMSlot *slot)
 {
     KVMState *s = kvm_state;
     struct kvm_userspace_memory_region mem;
+    int ret;
 
     mem.slot = slot->slot | (kml->as_id << 16);
     mem.guest_phys_addr = slot->start_addr;
@@ -248,7 +249,10 @@ static int kvm_set_user_memory_region(KVMMemoryListener 
*kml, KVMSlot *slot)
         kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
     }
     mem.memory_size = slot->memory_size;
-    return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
+    ret = kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
+    trace_kvm_set_user_memory(mem.slot, mem.flags, mem.guest_phys_addr,
+                              mem.memory_size, mem.userspace_addr, ret);
+    return ret;
 }
 
 int kvm_destroy_vcpu(CPUState *cpu)
-- 
2.11.0