diff --git a/pkg/hostman/guestman/guestman.go b/pkg/hostman/guestman/guestman.go
index 3e017ebabe..13ce6e5a5f 100644
--- a/pkg/hostman/guestman/guestman.go
+++ b/pkg/hostman/guestman/guestman.go
@@ -137,7 +137,10 @@ func (m *SGuestManager) InitQemuMaxCpus(machineCaps []monitor.MachineInfo, kvmMa
 		for i := 0; i < len(machineCaps); i++ {
 			if (machineCaps[i].Alias != nil && *machineCaps[i].Alias == machine) ||
 				machineCaps[i].Name == machine {
-				cpuMax := minFunc(uint(machineCaps[i].CPUMax), kvmMaxCpus)
+				cpuMax := uint(machineCaps[i].CPUMax)
+				if kvmMaxCpus > 0 {
+					cpuMax = minFunc(cpuMax, kvmMaxCpus)
+				}
 				if utils.IsInStringArray(machine, []string{"pc", "q35"}) {
 					// Note: if max cpux exceed 255, machine requires Extended Interrupt Mode enabled.
 					// You can add an IOMMU using: -device intel-iommu,intremap=on,eim=on
diff --git a/pkg/hostman/guestman/pci.go b/pkg/hostman/guestman/pci.go
index 1fc6ba78c1..24d0c74303 100644
--- a/pkg/hostman/guestman/pci.go
+++ b/pkg/hostman/guestman/pci.go
@@ -57,7 +57,7 @@ func (s *SKVMGuestInstance) initGuestDesc() error {
 	s.initMemDesc(s.Desc.Mem)
 	s.initMachineDesc()
 
-	pciRoot, pciBridge := s.initGuestPciControllers(true)
+	pciRoot, pciBridge := s.initGuestPciControllers(s.manager.host.IsKvmSupport())
 	err = s.initGuestPciAddresses()
 	if err != nil {
 		return errors.Wrap(err, "init guest pci addresses")