From: Tamas K Lengyel <tklengyel@sec.in.tum.de>
Date: Wed, 24 Jun 2015 08:33:05 +0000 (+0200)
Subject: x86/mem_sharing: relax sanity check for memops
X-Git-Tag: 4.6.0-rc1~407
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=c566ffadec51aecafbda17e3830d063966b634fd;p=xen.git

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 0700f0019a..16e329eb2f 100644
--- 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: