Hello again, This is version two of the ravingly popular series I previously posted here: https://lore.kernel.org/r/20201021104611.2744565-1-qais.yousef@xxxxxxx Changes since v1 include: * Fix setting of compat hwcaps * Simplify sysfs code to use DEVICE_ATTR_RO() * Allow onlining of late CPUs in face of mismatch * Use a static key in the context-switch path * Avoid printing that we detected 32-bit EL0 support when we didn't This has unfortunately introduced more complexity than I would've liked, but it also seems to be free of any rough edges. I haven't yet tackled the execve() problem raised by Suren. I've got some local hacks, but nothing I'm happy with yet. They will come as follow-up patches in any case. As before, I don't think we should merge this stuff until we've figured out what's going on in Android, but hopefully we can reach some agreement on the basics before then. Cheers, Will Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Marc Zyngier <maz@xxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Morten Rasmussen <morten.rasmussen@xxxxxxx> Cc: Qais Yousef <qais.yousef@xxxxxxx> Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx> Cc: Quentin Perret <qperret@xxxxxxxxxx> Cc: kernel-team@xxxxxxxxxxx --->8 Will Deacon (6): arm64: cpuinfo: Split AArch32 registers out into a separate struct arm64: Allow mismatched 32-bit EL0 support KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs arm64: Advertise CPUs capable of running 32-bit applications in sysfs arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 .../ABI/testing/sysfs-devices-system-cpu | 9 + .../admin-guide/kernel-parameters.txt | 7 + arch/arm64/include/asm/cpu.h | 44 ++-- arch/arm64/include/asm/cpucaps.h | 2 +- arch/arm64/include/asm/cpufeature.h | 8 +- arch/arm64/kernel/cpufeature.c | 198 ++++++++++++++---- arch/arm64/kernel/cpuinfo.c | 53 ++--- arch/arm64/kernel/process.c | 19 +- arch/arm64/kernel/signal.c | 26 +++ arch/arm64/kvm/arm.c | 11 +- 10 files changed, 288 insertions(+), 89 deletions(-) -- 2.29.2.222.g5d2a92d10f8-goog
