[Xen-changelog] [xen staging] libxl: fix assertion failure in stub domain creation

[patchbot@xxxxxxx]

commit d00377890a3c62e0e925d171b6b839406b6d134d
Author:     Paul Durrant <pdurrant@xxxxxxxxxx>
AuthorDate: Wed Feb 5 11:24:12 2020 +0000
Commit:     Wei Liu <wl@xxxxxxx>
CommitDate: Wed Feb 5 11:56:27 2020 +0000

    libxl: fix assertion failure in stub domain creation
    
    An assertion in libxl__domain_make():
    
    'soft_reset || *domid == INVALID_DOMID'
    
    does not hold true for stub domain creation, where soft_reset is false
    but the passed in domid == 0. This is easily fixed by changing the
    initializer in libxl__spawn_stub_dm().
    
    NOTE: The comment for XEN_DOMCTL_createdomain in domctl.h is changed to
          reflect reality.
    
    Fixes: 75259239d85d ("libxl_create: make 'soft reset' explicit")
    Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
    Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Acked-by: Wei Liu <wl@xxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 tools/libxl/libxl_dm.c      | 2 +-
 xen/include/public/domctl.h | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index f758daf3b6..3b1da90167 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -2127,7 +2127,7 @@ void libxl__spawn_stub_dm(libxl__egc *egc, 
libxl__stub_dm_spawn_state *sdss)
         goto out;
     }
 
-    sdss->pvqemu.guest_domid = 0;
+    sdss->pvqemu.guest_domid = INVALID_DOMID;
 
     libxl_domain_create_info_init(&dm_config->c_info);
     dm_config->c_info.type = LIBXL_DOMAIN_TYPE_PV;
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 2bb7397923..fec6f6fdd1 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -42,7 +42,8 @@
 
 /*
  * NB. xen_domctl.domain is an IN/OUT parameter for this operation.
- * If it is specified as zero, an id is auto-allocated and returned.
+ * If it is specified as an invalid value (0 or >= DOMID_FIRST_RESERVED),
+ * an id is auto-allocated and returned.
  */
 /* XEN_DOMCTL_createdomain */
 struct xen_domctl_createdomain {
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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