x86/mem_sharing: relax sanity check for memops

The sharing vm_event ring being enabled is not necessary for mem_sharing
memops.

Signed-off-by: Tamas K Lengyel <tklengyel@sec.in.tum.de>
Reviewed-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>

diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c
index 0700f0019a5e1abec0dd7ece2ef5942e0e195b22..16e329eb2f56628a350ce19d4da552b14e2f39d1 100644 (file)
--- a/xen/arch/x86/mm/mem_sharing.c
+++ b/xen/arch/x86/mm/mem_sharing.c
@@ -1320,10 +1320,6 @@ int mem_sharing_memop(XEN_GUEST_HANDLE_PARAM(xen_mem_sharing_op_t) arg)
     if ( !hap_enabled(d) || !d->arch.hvm_domain.mem_sharing_enabled )
         goto out;
 
-    rc = -ENODEV;
-    if ( unlikely(!d->vm_event->share.ring_page) )
-        goto out;
-
     switch ( mso.op )
     {
         case XENMEM_sharing_op_nominate_gfn: