[feature] Support disable/enable CPU features for AArch64 · Pull Request !79 · src-openEuler/qemu

QEMU does not support disable/enable CPU features in AArch64 for now.                                                                                                        This patch series add support for CPU features in AArch64.
                                                                                                                                                                             Firstly, we change the isar struct in ARMCPU to an array for                                                                                                                 convenience.  Secondly, we add support to configure CPU feautres in                                                                                                          AArch64 and make sure that the ID registers can be synchronized to KVM                                                                                                       so that guest can read the value we configure.  Thirdly, we add a                                                                                                            mechanism to solve the dependency relationship of some CPU features.
Last, we add a KVM_CAP_ARM_CPU_FEATURE to check whether KVM supports to                                                                                                      set CPU features in AArch64.

Also export CPU features to the result of qmp query-cpu-model-expansion
so that libvirt can get the supported CPU features.

Update the ID fields to ARMv8.6 and add some CPU features according to
the new ID fields.

With related KVM patch set[1], we can disable/enable CPU features in
AArch64.

[1] https://patchwork.kernel.org/cover/11711693/

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