fix reserved memory is zero

pkg/hostman/hostinfo/hostinfo.go

@@ -831,6 +831,9 @@ func (h *SHostInfo) getReservedMem() int {
 	if reserved > options.HostOptions.MaxReservedMemory {
 		return options.HostOptions.MaxReservedMemory
 	}
+	if reserved == 0 {
+		panic("memory reserve value is 0, need help")
+	}
 	return reserved
 }
 

pkg/hostman/hostinfo/hostinfohelper.go

@@ -152,6 +152,10 @@ func DetectMemoryInfo() (*SMemory, error) {
 		return nil, err
 	}
 	smem.MemInfo = sysutils.ParseDMIMemInfo(strings.Split(string(ret), "\n"))
+	if smem.MemInfo.Total == 0 {
+		// in case dmidecode is not work, use gopsutil
+		smem.MemInfo.Total = smem.Total
+	}
 	return smem, nil
 }