[xen staging] xen/gnttab: Log when grant_table_init() fails

[patchbot@xxxxxxx]

commit 3487f4cf8bf5cef47a4c3918c13a502afc9891f6
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue Jan 19 11:08:17 2021 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Jan 19 18:05:20 2021 +0000

    xen/gnttab: Log when grant_table_init() fails
    
    ... so debug builds can see what went wrong, rather than getting an
    unqualified -EINVAL out of domain creation.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/common/grant_table.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index b24bce0f9f..f6f5acd300 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -1920,7 +1920,11 @@ int grant_table_init(struct domain *d, int 
max_grant_frames,
     if ( max_grant_frames < INITIAL_NR_GRANT_FRAMES ||
          max_grant_frames > opt_max_grant_frames ||
          max_maptrack_frames > opt_max_maptrack_frames )
+    {
+        dprintk(XENLOG_INFO, "Bad grant table sizes: grant %u, maptrack %u\n",
+                max_grant_frames, max_maptrack_frames);
         return -EINVAL;
+    }
 
     if ( (gt = xzalloc(struct grant_table)) == NULL )
         return -ENOMEM;
--
generated by git-patchbot for /home/xen/git/xen.git#staging