diff --git a/pkg/hostman/guestman/guestman.go b/pkg/hostman/guestman/guestman.go
index 247e2db0d3..b212fbf409 100644
--- a/pkg/hostman/guestman/guestman.go
+++ b/pkg/hostman/guestman/guestman.go
@@ -141,6 +141,8 @@ func (m *SGuestManager) InitQemuMaxCpus(machineCaps []monitor.MachineInfo, kvmMa
 					// You can add an IOMMU using: -device intel-iommu,intremap=on,eim=on
 					// Set x86 machine max cpu 240 for now.
 					m.qemuMachineCpuMax[machine] = minFunc(cpuMax, m.qemuMachineCpuMax[machine])
+				} else {
+					m.qemuMachineCpuMax[machine] = cpuMax
 				}
 				log.Infof("Machine type %s max cpus: %d", machine, m.qemuMachineCpuMax[machine])
 			}
diff --git a/pkg/hostman/guestman/qemu-kvm.go b/pkg/hostman/guestman/qemu-kvm.go
index 52f42fb48c..8ec941a572 100644
--- a/pkg/hostman/guestman/qemu-kvm.go
+++ b/pkg/hostman/guestman/qemu-kvm.go
@@ -2163,7 +2163,9 @@ func (s *SKVMGuestInstance) OnResumeSyncMetadataInfo() {
 	} else {
 		meta.Set("__cpu_mode", jsonutils.NewString(api.CPU_MODE_HOST))
 	}
-	meta.Set("__pcie_extend_bus", jsonutils.JSONTrue)
+	if s.hasPcieExtendBus() {
+		meta.Set("__pcie_extend_bus", jsonutils.JSONTrue)
+	}
 	cmdline, err := s.getQemuCmdline()
 	if err != nil {
 		log.Errorf("Get qemu process cmdline error: %v", err)
diff --git a/pkg/hostman/guestman/qemu-kvmhelper.go b/pkg/hostman/guestman/qemu-kvmhelper.go
index 8eefa338db..dd29fb1450 100644
--- a/pkg/hostman/guestman/qemu-kvmhelper.go
+++ b/pkg/hostman/guestman/qemu-kvmhelper.go
@@ -744,11 +744,12 @@ func (s *SKVMGuestInstance) gpusHasVga() bool {
 }
 
 func (s *SKVMGuestInstance) initCpuDesc() error {
-	cpudesc, err := s.archMan.GenerateCpuDesc(uint(s.Desc.Cpu), s)
+	s.fixGuestMachineType()
+	cpuDesc, err := s.archMan.GenerateCpuDesc(uint(s.Desc.Cpu), s)
 	if err != nil {
 		return err
 	}
-	s.Desc.CpuDesc = cpudesc
+	s.Desc.CpuDesc = cpuDesc
 	return nil
 }
 
@@ -809,7 +810,7 @@ func (s *SKVMGuestInstance) initMemDescFromMemoryInfo(memoryDevicesInfoList []mo
 	return nil
 }
 
-func (s *SKVMGuestInstance) initMachineDesc() {
+func (s *SKVMGuestInstance) fixGuestMachineType() {
 	if s.GetOsName() == OS_NAME_MACOS {
 		s.Desc.Machine = api.VM_MACHINE_TYPE_Q35
 		s.Desc.Bios = qemu.BIOS_UEFI
@@ -822,6 +823,9 @@ func (s *SKVMGuestInstance) initMachineDesc() {
 		}
 		s.Desc.Bios = qemu.BIOS_UEFI
 	}
+}
+
+func (s *SKVMGuestInstance) initMachineDesc() {
 	s.Desc.MachineDesc = s.archMan.GenerateMachineDesc(s.Desc.CpuDesc.Accel)
 }