[PATCH v3 07/10] tools: Introduce a non-truncating xc_xenver_capabilities()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Update libxl and the ocaml stubs to match.  No API/ABI change in either.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Acked-by: Christian Lindig <christian.lindig@xxxxxxxxxx>
---
CC: Wei Liu <wl@xxxxxxx>
CC: Anthony PERARD <anthony.perard@xxxxxxxxxx>
CC: Juergen Gross <jgross@xxxxxxxx>
CC: Christian Lindig <christian.lindig@xxxxxxxxxx>
CC: David Scott <dave@xxxxxxxxxx>
CC: Edwin Torok <edvin.torok@xxxxxxxxxx>
CC: Rob Hoes <Rob.Hoes@xxxxxxxxxx>
---
 tools/include/xenctrl.h             |  1 +
 tools/libs/ctrl/xc_version.c        |  5 +++++
 tools/libs/light/libxl.c            |  4 +---
 tools/ocaml/libs/xc/xenctrl_stubs.c | 18 ++++++++++++++++--
 4 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/tools/include/xenctrl.h b/tools/include/xenctrl.h
index b839196bf4c4..9bd5eed7397a 100644
--- a/tools/include/xenctrl.h
+++ b/tools/include/xenctrl.h
@@ -1598,6 +1598,7 @@ int xc_version(xc_interface *xch, int cmd, void *arg);
  * free().
  */
 char *xc_xenver_extraversion(xc_interface *xch);
+char *xc_xenver_capabilities(xc_interface *xch);
 
 int xc_flask_op(xc_interface *xch, xen_flask_op_t *op);
 
diff --git a/tools/libs/ctrl/xc_version.c b/tools/libs/ctrl/xc_version.c
index 2c14474feec5..512302a393ea 100644
--- a/tools/libs/ctrl/xc_version.c
+++ b/tools/libs/ctrl/xc_version.c
@@ -156,3 +156,8 @@ char *xc_xenver_extraversion(xc_interface *xch)
 {
     return varbuf_simple_string(xch, XENVER_extraversion2);
 }
+
+char *xc_xenver_capabilities(xc_interface *xch)
+{
+    return varbuf_simple_string(xch, XENVER_capabilities2);
+}
diff --git a/tools/libs/light/libxl.c b/tools/libs/light/libxl.c
index f91f7271d5bf..ae6c5e04cd59 100644
--- a/tools/libs/light/libxl.c
+++ b/tools/libs/light/libxl.c
@@ -584,7 +584,6 @@ const libxl_version_info* libxl_get_version_info(libxl_ctx 
*ctx)
     union {
         xen_compile_info_t xen_cc;
         xen_changeset_info_t xen_chgset;
-        xen_capabilities_info_t xen_caps;
         xen_platform_parameters_t p_parms;
         xen_commandline_t xen_commandline;
         xen_build_id_t build_id;
@@ -608,8 +607,7 @@ const libxl_version_info* libxl_get_version_info(libxl_ctx 
*ctx)
     info->compile_domain = libxl__strdup(NOGC, u.xen_cc.compile_domain);
     info->compile_date = libxl__strdup(NOGC, u.xen_cc.compile_date);
 
-    xc_version(ctx->xch, XENVER_capabilities, &u.xen_caps);
-    info->capabilities = libxl__strdup(NOGC, u.xen_caps);
+    info->capabilities = xc_xenver_capabilities(ctx->xch);
 
     xc_version(ctx->xch, XENVER_changeset, &u.xen_chgset);
     info->changeset = libxl__strdup(NOGC, u.xen_chgset);
diff --git a/tools/ocaml/libs/xc/xenctrl_stubs.c 
b/tools/ocaml/libs/xc/xenctrl_stubs.c
index 379a7935a145..e8da7d18d29d 100644
--- a/tools/ocaml/libs/xc/xenctrl_stubs.c
+++ b/tools/ocaml/libs/xc/xenctrl_stubs.c
@@ -1062,9 +1062,23 @@ CAMLprim value stub_xc_version_changeset(value xch_val)
 
 CAMLprim value stub_xc_version_capabilities(value xch_val)
 {
-       xen_capabilities_info_t ci;
+       CAMLparam1(xch_val);
+       CAMLlocal1(result);
+       xc_interface *xch = xch_of_val(xch_val);
+       char *capabilities;
+
+       caml_enter_blocking_section();
+       capabilities = xc_xenver_capabilities(xch);
+       caml_leave_blocking_section();
 
-       return xc_version_single_string(xch_val, XENVER_capabilities, &ci);
+       if (!capabilities)
+               failwith_xc(xch);
+
+       result = caml_copy_string(capabilities);
+
+       free(capabilities);
+
+       CAMLreturn(result);
 }
 
 
-- 
2.30.2