[Xen-devel] [PATCH v3 10/22] golang/xenlight: define CpuidPolicyList builtin type

[Nick Rosbrook <rosbrookn@xxxxxxxxx>]

From: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>

Define CpuidPolicyList as a string so that libxl_cpuid_parse_config can
be used in the toC function.

For now, fromC is a no-op since libxl does not support a way to read a
policy, modify it,and then give it back to libxl.

Signed-off-by: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>
Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>
---
Changes in v2:
- Re-define CpuidPolicyList as string.
- Make fromC a no-op.
- Use libxl_cpuid_parse_config in toC function.
---
 tools/golang/xenlight/xenlight.go | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tools/golang/xenlight/xenlight.go 
b/tools/golang/xenlight/xenlight.go
index c1d9fe85fd..6b87bf857d 100644
--- a/tools/golang/xenlight/xenlight.go
+++ b/tools/golang/xenlight/xenlight.go
@@ -245,6 +245,31 @@ type EvLink struct{}
 func (el *EvLink) fromC(cel *C.libxl_ev_link) error      { return nil }
 func (el *EvLink) toC() (cel C.libxl_ev_link, err error) { return }
 
+// CpuidPolicyList represents a libxl_cpuid_policy_list.
+//
+// The value of CpuidPolicyList is honored when used as input to libxl. If
+// a struct contains a field of type CpuidPolicyList, that field will be left
+// empty when it is returned from libxl.
+type CpuidPolicyList string
+
+func (cpl CpuidPolicyList) fromC(ccpl *C.libxl_cpuid_policy_list) error { 
return nil }
+
+func (cpl CpuidPolicyList) toC() (C.libxl_cpuid_policy_list, error) {
+       var ccpl C.libxl_cpuid_policy_list
+
+       s := C.CString(string(cpl))
+       defer C.free(unsafe.Pointer(s))
+
+       ret := C.libxl_cpuid_parse_config(&ccpl, s)
+       if ret != 0 {
+               C.libxl_cpuid_dispose(&ccpl)
+
+               return ccpl, Error(-ret)
+       }
+
+       return ccpl, nil
+}
+
 type Context struct {
        ctx    *C.libxl_ctx
        logger *C.xentoollog_logger_stdiostream
-- 
2.19.1


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