KVM: Skip unnecessary "unmap" if gpc is already valid during refresh

When refreshing a gfn=>pfn cache, skip straight to unlocking if the cache already valid instead of stuffing the "old" variables to turn the unmapping outro into a nop. Signed-off-by: Sean Christopherson <[email protected]> Signed-off-by: David Woodhouse <[email protected]>
wafgo · Nov 30, 2022 · 06e155c · 06e155c
1 parent 58f5ee5
commit 06e155c
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c
@@ -301,9 +301,8 @@ static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa,
 		 * may have changed.
 		 */
 		gpc->khva = old_khva + page_offset;
-		old_pfn = KVM_PFN_ERR_FAULT;
-		old_khva = NULL;
 		ret = 0;
+		goto out_unlock;
 	}
 
  out: