[Xen-changelog] [xen-4.0-testing] Allow VMs to query their own grant table version.

[Xen patchbot-4.0-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Paul Durrant <paul.durrant@xxxxxxxxxx>
# Date 1324219864 0
# Node ID 5d372b8bccefea17a57a887f5828a57ee6adf2b5
# Parent  47bec9555bb4f6b10d9c7e57affc2401287c7f99
Allow VMs to query their own grant table version.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Committed-by: Keir Fraser <keir@xxxxxxx>
xen-unstable changeset:   24427:931bf1105730
xen-unstable date:        Sun Dec 18 14:38:32 2011 +0000
---


diff -r 47bec9555bb4 -r 5d372b8bccef xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c    Sun Dec 18 14:49:59 2011 +0000
+++ b/xen/arch/x86/hvm/hvm.c    Sun Dec 18 14:51:04 2011 +0000
@@ -2181,6 +2181,7 @@
     case GNTTABOP_query_size:
     case GNTTABOP_setup_table:
     case GNTTABOP_set_version:
+    case GNTTABOP_get_version:
     case GNTTABOP_copy:
     case GNTTABOP_map_grant_ref:
     case GNTTABOP_unmap_grant_ref:
diff -r 47bec9555bb4 -r 5d372b8bccef xen/common/grant_table.c
--- a/xen/common/grant_table.c  Sun Dec 18 14:49:59 2011 +0000
+++ b/xen/common/grant_table.c  Sun Dec 18 14:51:04 2011 +0000
@@ -2199,17 +2199,15 @@
 {
     gnttab_get_version_t op;
     struct domain *d;
+    int rc;
 
     if ( copy_from_guest(&op, uop, 1) )
         return -EFAULT;
-    d = rcu_lock_domain_by_id(op.dom);
-    if ( d == NULL )
-        return -ESRCH;
-    if ( !IS_PRIV_FOR(current->domain, d) )
-    {
-        rcu_unlock_domain(d);
-        return -EPERM;
-    }
+
+    rc = rcu_lock_target_domain_by_id(op.dom, &d);
+    if ( rc < 0 )
+        return rc;
+
     spin_lock(&d->grant_table->lock);
     op.version = d->grant_table->gt_version;
     spin_unlock(&d->grant_table->lock);

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