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
