arm64: cpufeature: Read MPAMIDR_EL1 in __cpuinfo_store_cpu()

MPAMIDR_EL1 is the one ID register __cpuinfo_store_cpu() doesn't read.
Its read was deferred to init_cpu_features() and update_cpu_features()
because it traps on firmware that fails to enable MPAM. Only the
sanitised ID_AA64PFR0_EL1 and ID_AA64PFR1_EL1 carried the arm64.nompam
override for such firmware.

Store ID_AA64PFR0_EL1 through read_cpuid_with_overrides() as well. Then
read MPAMIDR_EL1 in __cpuinfo_store_cpu() again, beside GMID_EL1, gated
on this CPU's overridden ID_AA64PFR0_EL1 and ID_AA64PFR1_EL1. cpu_data
is then complete before init_cpu_features() runs.

Other readers of the stored ID_AA64PFR0_EL1 see the override too. With
arm64.no32bit_el0, __cpuinfo_store_cpu() no longer reads the AArch32 ID
registers. Adding allow_mismatched_32bit_el0 no longer enables 32-bit
EL0 either.

detect_ftr_has_mpam(), a system-wide test on the sanitised values,
stays for the ARM64_MPAM capability.

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Signed-off-by: Will Deacon <will@kernel.org>
Reviewed-by: Ben Horgan <ben.horgan@arm.com>
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