diff --git a/pkg/compute/models/isolated_devices.go b/pkg/compute/models/isolated_devices.go
index ded7ae7b7a..83a0e05372 100644
--- a/pkg/compute/models/isolated_devices.go
+++ b/pkg/compute/models/isolated_devices.go
@@ -76,7 +76,7 @@ type SIsolatedDevice struct {
 	HostId string `width:"36" charset:"ascii" nullable:"false" default:"" index:"true" list:"admin" create:"admin_required"` // Column(VARCHAR(36, charset='ascii'), nullable=False, default='', server_default='', index=True)
 
 	// # PCI / GPU-HPC / GPU-VGA / USB / NIC
-	DevType string `width:"16" charset:"ascii" nullable:"false" default:"" index:"true" list:"admin" create:"admin_required"` // Column(VARCHAR(16, charset='ascii'), nullable=False, default='', server_default='', index=True)
+	DevType string `width:"16" charset:"ascii" nullable:"false" default:"" index:"true" list:"admin" create:"admin_required" update:"admin"` // Column(VARCHAR(16, charset='ascii'), nullable=False, default='', server_default='', index=True)
 
 	// # Specific device name read from lspci command, e.g. `Tesla K40m` ...
 	Model string `width:"32" charset:"ascii" nullable:"false" default:"" index:"true" list:"admin" create:"admin_required" update:"admin"` // Column(VARCHAR(32, charset='ascii'), nullable=False, default='', server_default='', index=True)
diff --git a/pkg/hostman/isolated_device/isolated_device.go b/pkg/hostman/isolated_device/isolated_device.go
index 1cf330d52c..51770b2422 100644
--- a/pkg/hostman/isolated_device/isolated_device.go
+++ b/pkg/hostman/isolated_device/isolated_device.go
@@ -26,6 +26,7 @@ import (
 	"yunion.io/x/pkg/util/sets"
 	"yunion.io/x/pkg/utils"
 
+	api "yunion.io/x/onecloud/pkg/apis/compute"
 	o "yunion.io/x/onecloud/pkg/hostman/options"
 	"yunion.io/x/onecloud/pkg/mcclient"
 	"yunion.io/x/onecloud/pkg/mcclient/modules"
@@ -35,12 +36,6 @@ import (
 )
 
 const (
-	// TODO: merge  models/isolated_devices in new file
-	DIRECT_PCI_TYPE = "PCI"
-	GPU_HPC_TYPE    = "GPU-HPC" // # for compute
-	GPU_VGA_TYPE    = "GPU-VGA" // # for display
-	USB_TYPE        = "USB"
-
 	CLASS_CODE_VGA = "0300"
 	CLASS_CODE_3D  = "0302"
 )
@@ -381,7 +376,7 @@ type sGPUVGADevice struct {
 }
 
 func (gpu *sGPUVGADevice) GetDeviceType() string {
-	return GPU_VGA_TYPE
+	return api.GPU_VGA_TYPE
 }
 
 func (gpu *sGPUVGADevice) GetVGACmd() string {
@@ -411,13 +406,15 @@ type sGPUHPCDevice struct {
 }
 
 func newGPUHPCDevice(dev *PCIDevice) *sGPUHPCDevice {
-	return &sGPUHPCDevice{
+	gpuDev := &sGPUHPCDevice{
 		sGPUBaseDevice: newGPUBaseDevice(dev),
 	}
+	gpuDev.devType = gpuDev.GetDeviceType()
+	return gpuDev
 }
 
 func (gpu *sGPUHPCDevice) GetDeviceType() string {
-	return GPU_HPC_TYPE
+	return api.GPU_HPC_TYPE
 }
 
 func (gpu *sGPUHPCDevice) GetPassthroughCmd(index int) string {
@@ -798,7 +795,7 @@ func getQemuParams(man *IsolatedDeviceManager, devAddrs []string) *QemuParams {
 			continue
 		}
 		devCmds = append(devCmds, GetDeviceCmd(dev, idx))
-		if dev.GetVGACmd() != vgaCmd && dev.GetDeviceType() == GPU_VGA_TYPE {
+		if dev.GetVGACmd() != vgaCmd && dev.GetDeviceType() == api.GPU_VGA_TYPE {
 			vgaCmd = dev.GetVGACmd()
 		}
 		if dev.GetCPUCmd() != cpuCmd {