[PATCH kvm-unit-tests 4/6] x86: api: do not pass size==0 to KVM_SET_USER_MEMORY_REGION except to delete a region

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

Do not pass size==0 unless the slot has been created before.  This returns
EINVAL.

Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
 api/memmap.cc | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/api/memmap.cc b/api/memmap.cc
index c625852..041e84a 100644
--- a/api/memmap.cc
+++ b/api/memmap.cc
@@ -11,11 +11,16 @@ mem_slot::mem_slot(mem_map& map, uint64_t gpa, uint64_t size, void* hva)
     , _log()
 {
     map._free_slots.pop();
-    update();
+    if (_size) {
+        update();
+    }
 }
 
 mem_slot::~mem_slot()
 {
+    if (!_size) {
+        return;
+    }
     _size = 0;
     try {
         update();
@@ -35,7 +40,9 @@ void mem_slot::set_dirty_logging(bool enabled)
         } else {
             _log.resize(0);
         }
-        update();
+        if (_size) {
+            update();
+        }
     }
 }
 
-- 
2.1.0


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