[Hygon][5.10][Feature]: Backport static_call for kvm_x86_ops · Pull Request !6100 · anolis/cloud-kernel

bugzilla: https://bugzilla.openanolis.cn/show_bug.cgi?id=27210

Use static calls to improve kvm_x86_ops performance.

Backport the two patchsets that has been merged in upstream:
#1 https://lkml.org/lkml/2021/1/14/1433
#2 https://lkml.org/lkml/2022/2/17/952

Patch list as below:

1. anolis: KVM/x86: make remaining kvm_x86_ops callbacks use static_call
2. KVM: x86: allow defining return-0 static calls
3. KVM: x86: make several APIC virtualization callbacks optional
4. KVM: x86: warn on incorrectly NULL members of kvm_x86_ops
5. KVM: x86: remove KVM_X86_OP_NULL and mark optional kvm_x86_ops
6. KVM: x86: use static_call_cond for optional callbacks
7. KVM: x86: return 1 unconditionally for availability of KVM_CAP_VAPIC
8. KVM: x86: use static calls to reduce kvm_x86_ops overhead
9. KVM: x86: introduce definitions to support static calls for kvm_x86_ops
10. KVM: X86: prepend vmx/svm prefix to additional kvm_x86_ops functions

[test log]
After applying the above patches, the VM operates normally - the underlying KVM module correctly calls kvm_x86_ops to support VM execution.

类型	指派人员	状态
审查	xunlei 半叶枫尘 Artie Ding guobin 冯光辉 Guixin Liu kun-llfl Xuchun Shang	已完成 (0/0人)
测试	小龙已测试通过	已完成 (1/1人)

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