libxc: Fix IOCTL_PRIVCMD_MMAPBATCH_V2 fallback check

privcmd_ioctl returns EINVAL if the type is not supported.
This fixes the guest booting issue caused by C/S 20791.

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Jan Beulich <jbeulich@novell.com>

diff --git a/tools/libxc/xc_linux.c b/tools/libxc/xc_linux.c
index e0e807f2cc514aeac4518024c7d55a321867000e..3f3bc10d95365bf1e301e4d7c95145cc58876d4a 100644 (file)
--- a/tools/libxc/xc_linux.c
+++ b/tools/libxc/xc_linux.c
@@ -180,7 +180,7 @@ void *xc_map_foreign_bulk(int xc_handle, uint32_t dom, int prot,
         }
     }
 
-    if ( rc < 0 && errno == ENOTTY && (int)num > 0 )
+    if ( rc < 0 && errno == EINVAL && (int)num > 0 )
     {
         /*
          * IOCTL_PRIVCMD_MMAPBATCH_V2 is not supported - fall back to