[Qemu-devel] [PATCH QEMU v3 2/2] xen: fix usage of xc_domain_create in domain builder

[Roger Pau Monne]

Due to the addition of HVMlite and the requirement to always provide a valid
xc_domain_configuration_t, xc_domain_create now always takes an arch domain
config, which can be NULL in order to mimic previous behaviour.

Add a small stub called xen_domain_create that encapsulates the correct call
to xc_domain_create depending on the libxc version detected.

Signed-off-by: Roger Pau Monné <address@hidden>
---
Cc: Stefano Stabellini <address@hidden>
Cc: address@hidden
---
Changes since v2:
 - Drop the last parameter to xen_create_domain since it's always NULL ATM
   and was causing build problems with older Xen versions.
 - Create two different inline functions instead of putting ifdefs inside of
   a single one.

Changes since v1:
 - Add a compat layer to support previous libxc versions.
 - Add machinery to detect current Xen unstable (4.7).
---
 configure                   | 17 +++++++++++++++++
 hw/xenpv/xen_domainbuild.c  |  2 +-
 include/hw/xen/xen_common.h | 16 ++++++++++++++++
 3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 779623a..001982f 100755
--- a/configure
+++ b/configure
@@ -1863,6 +1863,23 @@ EOF
   elif
       cat > $TMPC <<EOF &&
 #include <xenctrl.h>
+#include <stdint.h>
+int main(void) {
+  xc_interface *xc = NULL;
+  xen_domain_handle_t handle;
+  xc_domain_create(xc, 0, handle, 0, NULL, NULL);
+  return 0;
+}
+EOF
+      compile_prog "" "$xen_libs"
+    then
+    xen_ctrl_version=470
+    xen=yes
+
+  # Xen 4.6
+  elif
+      cat > $TMPC <<EOF &&
+#include <xenctrl.h>
 #include <xenstore.h>
 #include <stdint.h>
 #include <xen/hvm/hvm_info_table.h>
diff --git a/hw/xenpv/xen_domainbuild.c b/hw/xenpv/xen_domainbuild.c
index c0ab753..ac0e5ac 100644
--- a/hw/xenpv/xen_domainbuild.c
+++ b/hw/xenpv/xen_domainbuild.c
@@ -234,7 +234,7 @@ int xen_domain_build_pv(const char *kernel, const char 
*ramdisk,
     int rc;
 
     memcpy(uuid, qemu_uuid, sizeof(uuid));
-    rc = xc_domain_create(xen_xc, ssidref, uuid, flags, &xen_domid);
+    rc = xen_domain_create(xen_xc, ssidref, uuid, flags, &xen_domid);
     if (rc < 0) {
         fprintf(stderr, "xen: xc_domain_create() failed\n");
         goto err;
diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index 5923290..04bf6da 100644
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -417,4 +417,20 @@ static inline int xen_set_ioreq_server_state(XenXC xc, 
domid_t dom,
 
 #endif
 
+#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 470
+static inline int xen_domain_create(XenXC xc, uint32_t ssidref,
+                                    xen_domain_handle_t handle, uint32_t flags,
+                                    uint32_t *pdomid)
+{
+    return xc_domain_create(xc, ssidref, handle, flags, pdomid);
+}
+#else
+static inline int xen_domain_create(XenXC xc, uint32_t ssidref,
+                                    xen_domain_handle_t handle, uint32_t flags,
+                                    uint32_t *pdomid)
+{
+    return xc_domain_create(xc, ssidref, handle, flags, pdomid, NULL);
+}
+#endif
+
 #endif /* QEMU_HW_XEN_COMMON_H */
-- 
1.9.5 (Apple Git-50.3)