If we want to emulate ID registers, we need to initialize ID registers firstly. This commit is to add a helper function to traverse arm64_ftr_regs so that we can initialize ID registers from arm64_ftr_regs.
Signed-off-by: zhanghailiang <[email protected]> Signed-off-by: Peng Liang <[email protected]> --- arch/arm64/include/asm/cpufeature.h | 2 ++ arch/arm64/kernel/cpufeature.c | 13 +++++++++++++ 2 files changed, 15 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index f7e7144af174..8ea2c4307708 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -79,6 +79,8 @@ struct arm64_ftr_reg { extern struct arm64_ftr_reg arm64_ftr_reg_ctrel0; +int arm64_cpu_ftr_regs_traverse(int (*op)(u32, u64, void *), void *argp); + /* * CPU capabilities: * diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index dcc165b3fc04..6e31d3fbd791 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2855,3 +2855,16 @@ ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, return sprintf(buf, "Vulnerable\n"); } + +int arm64_cpu_ftr_regs_traverse(int (*op)(u32, u64, void *), void *argp) +{ + int i, ret; + + for (i = 0; i < ARRAY_SIZE(arm64_ftr_regs); i++) { + ret = (*op)(arm64_ftr_regs[i].sys_id, + arm64_ftr_regs[i].reg->sys_val, argp); + if (ret < 0) + return ret; + } + return 0; +} -- 2.26.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
