[xen staging] gnttab: maptrack handle shortage is not IOMMU related

[patchbot@xxxxxxx]

commit 5c10b96795ff546fbc9ba2f10141d4fb97e32672
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Sep 7 09:38:42 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Sep 7 09:38:42 2021 +0200

    gnttab: maptrack handle shortage is not IOMMU related
    
    Both comment and message string associated with GNTST_no_device_space
    suggest a connection to the IOMMU. A lack of maptrack handles has
    nothing to do with that; it's unclear to me why commit 6213b696ba65
    ("Grant-table interface redone") introduced it this way. Introduce a
    new error indicator.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/common/grant_table.c         | 2 +-
 xen/include/public/grant_table.h | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index df74e2d6a7..ee61603a97 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -1027,7 +1027,7 @@ map_grant_ref(
     {
         rcu_unlock_domain(rd);
         gdprintk(XENLOG_INFO, "Failed to obtain maptrack handle\n");
-        op->status = GNTST_no_device_space;
+        op->status = GNTST_no_space;
         return;
     }
 
diff --git a/xen/include/public/grant_table.h b/xen/include/public/grant_table.h
index 69d1e9662e..4dceed20bb 100644
--- a/xen/include/public/grant_table.h
+++ b/xen/include/public/grant_table.h
@@ -652,6 +652,7 @@ DEFINE_XEN_GUEST_HANDLE(gnttab_cache_flush_t);
 #define GNTST_bad_copy_arg    (-10) /* copy arguments cross page boundary.   */
 #define GNTST_address_too_big (-11) /* transfer page address too large.      */
 #define GNTST_eagain          (-12) /* Operation not done; try again.        */
+#define GNTST_no_space        (-13) /* Out of space (handles etc).           */
 /* ` } */
 
 #define GNTTABOP_error_msgs {                   \
@@ -667,7 +668,8 @@ DEFINE_XEN_GUEST_HANDLE(gnttab_cache_flush_t);
     "bad page",                                 \
     "copy arguments cross page boundary",       \
     "page address size too large",              \
-    "operation not done; try again"             \
+    "operation not done; try again",            \
+    "out of space",                             \
 }
 
 #endif /* __XEN_PUBLIC_GRANT_TABLE_H__ */
--
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