[RFC v3 00/12] 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.

v2 -> v3:
 - remove check_user and split some set_user for some ID registers
 - check the consistency of ID registers of vCPUS
 - add more doc for the limits

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 (12):
  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: Make ID_AA64PFR0_EL1 configurable
  kvm: arm64: Make ID_AA64DFR0_EL1 configurable
  kvm: arm64: Make ID_AA64ISAR0_EL1 configurable
  kvm: arm64: Make ID_AA64ISAR1_EL1 configurable
  kvm: arm64: Make ID_DFR0_EL1 configurable
  kvm: arm64: Make MVFR1_EL1 configurable
  kvm: arm64: Make other ID registers configurable
  kvm: arm64: Check consistent of ID register
  kvm: arm64: add KVM_CAP_ARM_CPU_FEATURE extension

 Documentation/virt/kvm/api.rst      |  36 ++++
 arch/arm64/include/asm/cpufeature.h |   4 +
 arch/arm64/include/asm/kvm_coproc.h |   2 +
 arch/arm64/include/asm/kvm_host.h   |   9 +
 arch/arm64/kernel/cpufeature.c      |  36 ++++
 arch/arm64/kvm/arm.c                |  22 +++
 arch/arm64/kvm/sys_regs.c           | 272 ++++++++++++++++++++++++++--
 include/uapi/linux/kvm.h            |   1 +
 8 files changed, 365 insertions(+), 17 deletions(-)

-- 
2.26.2

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