kvm虚拟机PCIE接口直通

PCIE接口直通

参考链接: kvm虚拟机PCI设备直通

预配置

打开Bios中的VT-d配置
Kernel引导配置iommu，参见文章 linux开启IOMMU方法 Linux开启IOMMU方法

# 重启生效
grubby --update-kernel=ALL --args=intel_iommu=on
# (amd_iommu/intel_iommu/AuthenticAMD))

安装lspci命令

yum -y install pciutils

识别设备

# 查看想希望卡的接口信息
[root@dell_3650t qemu]# lspci | grep 0719
01:00.0 Processing accelerators: Device 00a1:0719 (rev ff)
# 查看接口具体名称
[root@dell_3650t qemu]# virsh nodedev-list --tree |grep pci
  +- pci_0000_00_00_0
  +- pci_0000_00_01_0
  |   +- pci_0000_01_00_0
  +- pci_0000_00_02_0

获取设备xml信息

确认bus,slot,function信息

 [root@dell_3650t qemu]# virsh nodedev-dumpxml pci_0000_01_00_0
<device>
  <name>pci_0000_01_00_0</name>
  <path>/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0</path>
  <parent>pci_0000_00_01_0</parent>
  <driver>
    <name>aicard</name>
  </driver>
  <capability type='pci'>
    <domain>0</domain>
    <bus>1</bus>
    <slot>0</slot>
    <function>0</function>
    <product id='0x0719' />
    <vendor id='0x00a1' />
    <iommuGroup number='9'>
      <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
    </iommuGroup>
    <pci-express>
      <link validity='cap' port='0' speed='16' width='16'/>
      <link validity='sta' speed='16' width='16'/>
    </pci-express>
  </capability>
</device>

Detach设备

[root@dell_3650t ~]# virsh nodedev-dettach pci_0000_01_00_0
Device pci_0000_01_00_0 detached

配置虚拟机xml文件

根据之前查询到的Bus,slot,function信息修改相关数据

[root@dell_3650t qemu]# cat pci.xml 
<hostdev mode='subsystem' type='pci' managed='yes'>
   <source>
     <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
   </source>
</hostdev>

加载虚拟机xml文件

[root@dell_3650t qemu]# virsh attach-device kvm-122.10 pci.xml 
Device attached successfully

确认是否加载成功

# 登陆kvm服务器，使用lspci查看
[root@kvm-122 ~]# lspci | grep 0719
00:04.0 Processing accelerators: Device 00a1:0719 (rev ff)

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