主机不支持请求的功能：CPUID.01H：EDX.ds [位21]这是否会警告虚拟机的性能或使用？

Question

我发现虚拟机qemu日志有很多警告，这是否会影响虚拟机的性能或使用？ ，是我的libvirt.xml文件问题？或支持热插拔都会有这些警告

这是我的libvirt的xml配置：

<domain type='kvm' id='315'> 
    <name>instance-000005b2</name> 
    <uuid>793fe065-36a6-4840-80cf-840ebed41d3e</uuid> 
    <maxMemory slots='32' unit='KiB'>68719476736</maxMemory> 
    <memory unit='KiB'>2097152</memory> 
    <currentMemory unit='KiB'>2097152</currentMemory> 
    <vcpu placement='auto'>8</vcpu> 
    <vcpus> 
    <vcpu id='0' enabled='yes' hotpluggable='no' order='1'/> 
    <vcpu id='1' enabled='yes' hotpluggable='yes' order='2'/> 
    <vcpu id='2' enabled='yes' hotpluggable='yes' order='3'/> 
    <vcpu id='3' enabled='yes' hotpluggable='yes' order='4'/> 
    <vcpu id='4' enabled='yes' hotpluggable='yes' order='5'/> 
    <vcpu id='5' enabled='yes' hotpluggable='yes' order='6'/> 
    <vcpu id='6' enabled='yes' hotpluggable='yes' order='7'/> 
    <vcpu id='7' enabled='yes' hotpluggable='yes' order='8'/> 
    </vcpus> 
    <cputune> 
    <shares>2048</shares> 
    <vcpupin vcpu='0' cpuset='0-9,20-29'/> 
    <vcpupin vcpu='1' cpuset='0-9,20-29'/> 
    <emulatorpin cpuset='0-9,20-29'/> 
    </cputune> 
    <numatune> 
    <memory mode='strict' nodeset='0'/> 
    <memnode cellid='0' mode='strict' nodeset='0'/> 
    </numatune> 
    <resource> 
    <partition>/machine</partition> 
    </resource> 
    <os> 
    <type arch='x86_64' machine='pc-i440fx-rhel7.3.0'>hvm</type> 
    <boot dev='hd'/> 
    </os> 
    <features> 
    <acpi/> 
    <apic/> 
    </features> 
    <cpu mode='host-model'> 
    <model fallback='allow'/> 
    <numa> 
     <cell id='0' cpus='0-1' memory='2097152' unit='KiB'/> 
    </numa> 
    </cpu> 
    <devices> 
    <emulator>/usr/libexec/qemu-kvm</emulator> 
    <controller type='virtio-serial' index='0'> 
     <alias name='virtio-serial0'/> 
     <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> 
    </controller> 
    <memballoon model='virtio'> 
     <alias name='balloon0'/> 
     <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> 
    </memballoon> 
    </devices> 
</domain> 

我发现有很多来自VM QEMU日志警告，这是否会影响发出警告虚拟机的性能和使用？ ，是我的libvirt.xml文件问题？或者支持热插拔会有这些警告？

以下警告日志：

2017-09-14T12:16:03.441702Z qemu-kvm: warning: CPU(s) not present in any NUMA nodes: 2 3 4 5 6 7 
2017-09-14T12:16:03.441773Z qemu-kvm: warning: All CPU(s) up to maxcpus should be described in NUMA config 
warning: host doesn't support requested feature: CPUID.01H:EDX.ds [bit 21] 
warning: host doesn't support requested feature: CPUID.01H:EDX.acpi [bit 22] 
warning: host doesn't support requested feature: CPUID.01H:EDX.ht [bit 28] 
warning: host doesn't support requested feature: CPUID.01H:EDX.tm [bit 29] 
warning: host doesn't support requested feature: CPUID.01H:EDX.pbe [bit 31] 
warning: host doesn't support requested feature: CPUID.01H:ECX.dtes64 [bit 2] 
warning: host doesn't support requested feature: CPUID.01H:ECX.monitor [bit 3] 
warning: host doesn't support requested feature: CPUID.01H:ECX.ds_cpl [bit 4] 
warning: host doesn't support requested feature: CPUID.01H:ECX.vmx [bit 5] 
warning: host doesn't support requested feature: CPUID.01H:ECX.smx [bit 6] 
warning: host doesn't support requested feature: CPUID.01H:ECX.est [bit 7] 
warning: host doesn't support requested feature: CPUID.01H:ECX.tm2 [bit 8] 
warning: host doesn't support requested feature: CPUID.01H:ECX.xtpr [bit 14] 
warning: host doesn't support requested feature: CPUID.01H:ECX.pdcm [bit 15] 
warning: host doesn't support requested feature: CPUID.01H:ECX.dca [bit 18] 
warning: host doesn't support requested feature: CPUID.01H:ECX.osxsave [bit 27] 
warning: host doesn't support requested feature: CPUID.01H:EDX.ds [bit 21] 
warning: host doesn't support requested feature: CPUID.01H:EDX.acpi [bit 22] 
warning: host doesn't support requested feature: CPUID.01H:EDX.ht [bit 28] 
warning: host doesn't support requested feature: CPUID.01H:EDX.tm [bit 29] 
warning: host doesn't support requested feature: CPUID.01H:EDX.pbe [bit 31] 
warning: host doesn't support requested feature: CPUID.01H:ECX.dtes64 [bit 2] 
warning: host doesn't support requested feature: CPUID.01H:ECX.monitor [bit 3] 
warning: host doesn't support requested feature: CPUID.01H:ECX.ds_cpl [bit 4] 

Answer 1

也许你可以尝试：的

mode='host-passthrough' 

代替：

mode='host-model'