Hi Greg,
These patches backport KPTI to v4.9.y (based on v4.9.92), providing protection
against meltdown on arm64 platforms.
I picked up Alex Shi's backport for review and testing, and as I found a couple
of issues to fix up, I'm sending this with my Signed-off-by in the chain, with
those fixups applied and noted.
To the best of my understanding the code is correct, in the context of the
v4.9.y kernel, and I've tested the seires on arm64 hardware available to me.
i.e. if this didn't have my Signed-off-by it would have my Reviewed-by and
Tested-by tags.
Are you happy to pick these up for v4.9.93?
Thanks,
Mark.
AKASHI Takahiro (1):
module: extend 'rodata=off' boot cmdline parameter to module mappings
Jayachandran C (2):
arm64: cputype: Add MIDR values for Cavium ThunderX2 CPUs
arm64: Turn on KPTI only on CPUs that need it
Marc Zyngier (2):
arm64: Allow checking of a CPU-local erratum
arm64: Force KPTI to be disabled on Cavium ThunderX
Mark Rutland (1):
arm64: factor out entry stack manipulation
Suzuki K Poulose (1):
arm64: capabilities: Handle duplicate entries for a capability
Will Deacon (20):
arm64: mm: Use non-global mappings for kernel space
arm64: mm: Move ASID from TTBR0 to TTBR1
arm64: mm: Allocate ASIDs in pairs
arm64: mm: Add arm64_kernel_unmapped_at_el0 helper
arm64: mm: Invalidate both kernel and user ASIDs when performing TLBI
arm64: entry: Add exception trampoline page for exceptions from EL0
arm64: mm: Map entry trampoline into trampoline and kernel page tables
arm64: entry: Explicitly pass exception level to kernel_ventry macro
arm64: entry: Hook up entry trampoline to exception vectors
arm64: tls: Avoid unconditional zeroing of tpidrro_el0 for native
tasks
arm64: entry: Add fake CPU feature for unmapping the kernel at EL0
arm64: kaslr: Put kernel vectors address in separate data page
arm64: use RET instruction for exiting the trampoline
arm64: Kconfig: Add CONFIG_UNMAP_KERNEL_AT_EL0
arm64: Kconfig: Reword UNMAP_KERNEL_AT_EL0 kconfig entry
arm64: Take into account ID_AA64PFR0_EL1.CSV3
arm64: kpti: Make use of nG dependent on
arm64_kernel_unmapped_at_el0()
arm64: kpti: Add ->enable callback to remap swapper using nG mappings
arm64: entry: Reword comment about post_ttbr_update_workaround
arm64: idmap: Use "awx" flags for .idmap.text .pushsection directives
arch/arm64/Kconfig | 12 ++
arch/arm64/include/asm/assembler.h | 3 +
arch/arm64/include/asm/cpucaps.h | 3 +-
arch/arm64/include/asm/cputype.h | 3 +
arch/arm64/include/asm/fixmap.h | 6 +
arch/arm64/include/asm/mmu.h | 11 ++
arch/arm64/include/asm/mmu_context.h | 7 ++
arch/arm64/include/asm/pgtable-hwdef.h | 1 +
arch/arm64/include/asm/pgtable-prot.h | 35 +++---
arch/arm64/include/asm/pgtable.h | 1 +
arch/arm64/include/asm/proc-fns.h | 6 -
arch/arm64/include/asm/sysreg.h | 1 +
arch/arm64/include/asm/tlbflush.h | 16 ++-
arch/arm64/kernel/asm-offsets.c | 6 +-
arch/arm64/kernel/cpu-reset.S | 2 +-
arch/arm64/kernel/cpufeature.c | 135 ++++++++++++++++++---
arch/arm64/kernel/entry.S | 188 ++++++++++++++++++++++++----
arch/arm64/kernel/head.S | 2 +-
arch/arm64/kernel/process.c | 12 +-
arch/arm64/kernel/sleep.S | 2 +-
arch/arm64/kernel/vmlinux.lds.S | 22 +++-
arch/arm64/mm/context.c | 25 ++--
arch/arm64/mm/mmu.c | 31 +++++
arch/arm64/mm/proc.S | 216 +++++++++++++++++++++++++++++++--
include/linux/init.h | 3 +
init/main.c | 7 +-
kernel/module.c | 20 ++-
27 files changed, 675 insertions(+), 101 deletions(-)
--
2.11.0