[RFC v2 0/7] kvm: arm64: emulate ID registers

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In AArch64, guest will read the same values of the ID regsiters with
host.  Both of them read the values from arm64_ftr_regs.  This patch
series add support to emulate and configure ID registers so that we can
control the value of ID registers that guest read.

v1 -> v2:
 - save the ID registers in sysreg file instead of a new struct
 - apply a checker before setting the value to the register
 - add doc for new KVM_CAP_ARM_CPU_FEATURE

Peng Liang (7):
  arm64: add a helper function to traverse arm64_ftr_regs
  arm64: introduce check_features
  kvm: arm64: save ID registers to sys_regs file
  kvm: arm64: introduce check_user
  kvm: arm64: implement check_user for ID registers
  kvm: arm64: make ID registers configurable
  kvm: arm64: add KVM_CAP_ARM_CPU_FEATURE extension

 Documentation/virt/kvm/api.rst      |   8 +
 arch/arm64/include/asm/cpufeature.h |   4 +
 arch/arm64/include/asm/kvm_coproc.h |   2 +
 arch/arm64/include/asm/kvm_host.h   |   3 +
 arch/arm64/kernel/cpufeature.c      |  36 +++
 arch/arm64/kvm/arm.c                |   3 +
 arch/arm64/kvm/sys_regs.c           | 481 +++++++++++++++++++++++++++-
 arch/arm64/kvm/sys_regs.h           |   6 +
 include/uapi/linux/kvm.h            |   1 +
 9 files changed, 532 insertions(+), 12 deletions(-)

-- 
2.26.2

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