arm64: cpufeature: Store every ID register with its overrides applied

__cpuinfo_store_cpu() stores ID_AA64PFR0_EL1 and ID_AA64PFR1_EL1 with
their overrides applied and every other register raw. Store the rest
the same way. Everything read with read_cpuid() goes through
read_cpuid_with_overrides(). CTR_EL0 and CNTFRQ_EL0, which are read
otherwise, go through arm64_ftr_reg_override(). It returns a register
with no override unchanged, so an override added to one later takes
effect without a change here.

init_cpu_ftr_reg() then gets values that already carry every valid
override, so its code to apply one is dead. Remove that code.
init_cpu_ftr_reg() still removes an unsafe override, so the same
overrides are rejected and sys_val is unchanged. Only its log changes.
The raw value is gone, so it logs an override equal to that value as
"forced" rather than "already set".

Secondaries are compared with the boot CPU on their stored values, so
CPUs that differ only in a field the command line turned off no longer
taint the kernel.

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

0 files changed, 0 insertions, 0 deletions