[Xen-devel] [PATCH 3/4] x86/mm: Return -ESRCH for an invalid foreign domid

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

For consistency with all other invalid domid handling.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

A positive effect this will have is causing Linux to break early from
batched foreign mappings, rather than attempting to complete the
mappings, recording -EINVAL failures for each map request.
---
 xen/arch/x86/mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index b65c3a5..92df36f 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -3544,7 +3544,7 @@ long do_mmu_update(
     {
         /* Pagetables belong to a foreign domain (PFD). */
         if ( (pt_owner = rcu_lock_domain_by_id(pt_dom - 1)) == NULL )
-            return -EINVAL;
+            return -ESRCH;
 
         if ( pt_owner == d )
             rcu_unlock_domain(pt_owner);
-- 
2.1.4


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