[Xen-devel] [PATCH RFC 3/8] golang/xenlight: Add host-related functionality

[Ronald Rojas <ronladred@xxxxxxxxx>]

Add calls for the following host-related functionality:
- libxl_get_max_cpus
- libxl_get_online_cpus
- libxl_get_max_nodes
- libxl_get_free_memory
- libxl_get_physinfo
- libxl_get_version_info

Include Golang versions of the following structs:
- libxl_physinfo as Physinfo
- libxl_version_info as VersionInfo
- libxl_hwcap as Hwcap

Signed-off-by: Ronald Rojas <ronladred@xxxxxxxxx>
---
 tools/golang/xenlight/xenlight.go | 185 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 185 insertions(+)

diff --git a/tools/golang/xenlight/xenlight.go 
b/tools/golang/xenlight/xenlight.go
index d58f8b8..6b04850 100644
--- a/tools/golang/xenlight/xenlight.go
+++ b/tools/golang/xenlight/xenlight.go
@@ -109,6 +109,62 @@ type Context struct {
        ctx *C.libxl_ctx
 }
 
+type Hwcap []C.uint32_t
+
+func hwcapCToGo(chwcap C.libxl_hwcap) (ghwcap Hwcap) {
+       // Alloc a Go slice for the bytes
+       size := 8
+       ghwcap = make([]C.uint32_t, size)
+
+       // Make a slice pointing to the C array
+       mapslice := (*[1 << 
30]C.uint32_t)(unsafe.Pointer(&chwcap[0]))[:size:size]
+
+       // And copy the C array into the Go array
+       copy(ghwcap, mapslice)
+
+       return
+}
+
+/*
+ * Types: IDL
+ *
+ * FIXME: Generate these automatically from the IDL
+ */
+
+type Physinfo struct {
+       ThreadsPerCore    uint32
+       CoresPerSocket    uint32
+       MaxCpuId          uint32
+       NrCpus            uint32
+       CpuKhz            uint32
+       TotalPages        uint64
+       FreePages         uint64
+       ScrubPages        uint64
+       OutstandingPages  uint64
+       SharingFreedPages uint64
+       SharingUsedFrames uint64
+       NrNodes           uint32
+       HwCap             Hwcap
+       CapHvm            bool
+       CapHvmDirectio    bool
+}
+
+type VersionInfo struct {
+       XenVersionMajor int
+       XenVersionMinor int
+       XenVersionExtra string
+       Compiler        string
+       CompileBy       string
+       CompileDomain   string
+       CompileDate     string
+       Capabilities    string
+       Changeset       string
+       VirtStart       uint64
+       Pagesize        int
+       Commandline     string
+       BuildId         string
+}
+
 /*
  * Context
  */
@@ -147,3 +203,132 @@ func (Ctx *Context) CheckOpen() (err error) {
        }
        return
 }
+
+//int libxl_get_max_cpus(libxl_ctx *ctx);
+func (Ctx *Context) GetMaxCpus() (maxCpus int, err error) {
+       err = Ctx.CheckOpen()
+       if err != nil {
+               return
+       }
+
+       ret := C.libxl_get_max_cpus(Ctx.ctx)
+       if ret < 0 {
+               err = Errorxl(ret)
+               return
+       }
+       maxCpus = int(ret)
+       return
+}
+
+//int libxl_get_online_cpus(libxl_ctx *ctx);
+func (Ctx *Context) GetOnlineCpus() (onCpus int, err error) {
+       err = Ctx.CheckOpen()
+       if err != nil {
+               return
+       }
+
+       ret := C.libxl_get_online_cpus(Ctx.ctx)
+       if ret < 0 {
+               err = Errorxl(ret)
+               return
+       }
+       onCpus = int(ret)
+       return
+}
+
+//int libxl_get_max_nodes(libxl_ctx *ctx);
+func (Ctx *Context) GetMaxNodes() (maxNodes int, err error) {
+       err = Ctx.CheckOpen()
+       if err != nil {
+               return
+       }
+       ret := C.libxl_get_max_nodes(Ctx.ctx)
+       if ret < 0 {
+               err = Errorxl(ret)
+               return
+       }
+       maxNodes = int(ret)
+       return
+}
+
+//int libxl_get_free_memory(libxl_ctx *ctx, uint64_t *memkb);
+func (Ctx *Context) GetFreeMemory() (memkb uint64, err error) {
+       err = Ctx.CheckOpen()
+       if err != nil {
+               return
+       }
+       var cmem C.uint64_t
+       ret := C.libxl_get_free_memory(Ctx.ctx, &cmem)
+
+       if ret < 0 {
+               err = Errorxl(ret)
+               return
+       }
+
+       memkb = uint64(cmem)
+       return
+
+}
+
+//int libxl_get_physinfo(libxl_ctx *ctx, libxl_physinfo *physinfo)
+func (Ctx *Context) GetPhysinfo() (physinfo *Physinfo, err error) {
+       err = Ctx.CheckOpen()
+       if err != nil {
+               return
+       }
+       var cphys C.libxl_physinfo
+
+       ret := C.libxl_get_physinfo(Ctx.ctx, &cphys)
+
+       if ret < 0 {
+               err = Errorxl(ret)
+               return
+       }
+       physinfo = &Physinfo{}
+       physinfo.ThreadsPerCore = uint32(cphys.threads_per_core)
+       physinfo.CoresPerSocket = uint32(cphys.cores_per_socket)
+       physinfo.MaxCpuId = uint32(cphys.max_cpu_id)
+       physinfo.NrCpus = uint32(cphys.nr_cpus)
+       physinfo.CpuKhz = uint32(cphys.cpu_khz)
+       physinfo.TotalPages = uint64(cphys.total_pages)
+       physinfo.FreePages = uint64(cphys.free_pages)
+       physinfo.ScrubPages = uint64(cphys.scrub_pages)
+       physinfo.ScrubPages = uint64(cphys.scrub_pages)
+       physinfo.SharingFreedPages = uint64(cphys.sharing_freed_pages)
+       physinfo.SharingUsedFrames = uint64(cphys.sharing_used_frames)
+       physinfo.NrNodes = uint32(cphys.nr_nodes)
+       physinfo.HwCap = hwcapCToGo(cphys.hw_cap)
+       physinfo.CapHvm = bool(cphys.cap_hvm)
+       physinfo.CapHvmDirectio = bool(cphys.cap_hvm_directio)
+
+       return
+}
+
+//const libxl_version_info* libxl_get_version_info(libxl_ctx *ctx);
+func (Ctx *Context) GetVersionInfo() (info *VersionInfo, err error) {
+       err = Ctx.CheckOpen()
+       if err != nil {
+               return
+       }
+
+       var cinfo *C.libxl_version_info
+
+       cinfo = C.libxl_get_version_info(Ctx.ctx)
+
+       info = &VersionInfo{}
+       info.XenVersionMajor = int(cinfo.xen_version_major)
+       info.XenVersionMinor = int(cinfo.xen_version_minor)
+       info.XenVersionExtra = C.GoString(cinfo.xen_version_extra)
+       info.Compiler = C.GoString(cinfo.compiler)
+       info.CompileBy = C.GoString(cinfo.compile_by)
+       info.CompileDomain = C.GoString(cinfo.compile_domain)
+       info.CompileDate = C.GoString(cinfo.compile_date)
+       info.Capabilities = C.GoString(cinfo.capabilities)
+       info.Changeset = C.GoString(cinfo.changeset)
+       info.VirtStart = uint64(cinfo.virt_start)
+       info.Pagesize = int(cinfo.pagesize)
+       info.Commandline = C.GoString(cinfo.commandline)
+       info.BuildId = C.GoString(cinfo.build_id)
+
+       return
+}
-- 
2.7.4


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