【虚拟化】kvm支持cpu配置为custom模式

1.2. kvm支持cpu配置为custom模式
host支持的feature，可以通过libvirt xml进行disable，require的控制
virsh domcapability呈现，与x86保持一致

根据会议纪要，虚拟化合入该特性到 openEuler 20.03 LTS SP1, 即 openEuler-1.0-LTS 分支。

已合入到4.19.90-2010.2.0
b94fc31d4e16 kvm: debugfs: aarch64 export cpu time related items to debugfs
4705428de711 kvm: debugfs: export remaining aarch64 kvm exit reasons to debugfs
8bcf970f6c48 kvm: debugfs: Export vcpu stat via debugfs
e5b0138da1ad kvm: fix compile error when including linux/kvm.h
423359713e83 kvm: arm64: add KVM_CAP_ARM_CPU_FEATURE extension
bbbc9d2ad19d kvm: arm64: make ID registers configurable
9da3ef184a75 kvm: arm64: emulate the ID registers
494e8cddb95b arm64: add a helper function to traverse arm64_ftr_regs

GVP openEuler / kernel

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GVPopenEuler / kernel

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