arm64: 52-bit physical address support

Quoted 72 lines

Kristina Martsenko wrote: [Wed Dec 13 2017, 12:07:15PM EST]

Quoted 71 lines

Hi,

This series adds 52-bit physical address space support to arm64, up from the current 48 bits. This is an ARMv8.2 feature (ARMv8.2-LPA).

The series is based on 4.15-rc3. It has been lightly tested on an ARM Fast Model. There's still some cases and areas to think through, as well as more testing to do.

Patches for SMMU 52-bit PA support have been sent separately [1]. A GIC ITS patch has already been merged [2]. ARMv8.2 also allows 52-bit IPA, but support for that is not part of this series.

This version mostly addresses various review comments received.

Changes from RFC:
- Split kconfig symbol into two patches, to enable 52-bit PA at the end
- Patch #3: Changed phys_to_ttbr to use a macro, added an #include
- Patch #4: Changed phys_to_pte to use a macro
- Patch #6: Replaced __phys_to_pte with __phys_to_pte_val (same for pmd/pud/pgd)
- Patch #6: Changed __phys_to_pte_val, __pte_to_phys, and pgtable-hwdef.h macros
- Patches #5, #6: Removed kvm_extended_idmap_pgd, inlined its code, moved the comment
- Patch #5: Added pfn_pud definition (to make the kernel build on that commit)

Thanks,
Kristina

[1] https://www.spinics.net/lists/arm-kernel/msg619040.html
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=30ae9610d275f8f03f5bf7612ce71d8af6fc400b

Kristina Martsenko (10):
arm64: add kconfig symbol to configure physical address size
arm64: limit PA size to supported range
arm64: handle 52-bit addresses in TTBR
arm64: head.S: handle 52-bit PAs in PTEs in early page table setup
arm64: don't open code page table entry creation
arm64: handle 52-bit physical addresses in page table entries
arm64: increase PHYS_MASK to 52 bits
arm64: increase sparsemem MAX_PHYSMEM_BITS to 52
arm64: allow ID map to be extended to 52 bits
arm64: enable 52-bit physical address support

 arch/arm/include/asm/kvm_mmu.h         |   7 ++
 arch/arm64/Kconfig                     |  29 ++++++++
 arch/arm64/include/asm/assembler.h     |  31 ++++++++-
 arch/arm64/include/asm/kvm_mmu.h       |  21 +++++-
 arch/arm64/include/asm/mmu_context.h   |  16 ++++-
 arch/arm64/include/asm/pgalloc.h       |   6 +-
 arch/arm64/include/asm/pgtable-hwdef.h |  19 +++++-
 arch/arm64/include/asm/pgtable.h       |  53 ++++++++++++---
 arch/arm64/include/asm/sparsemem.h     |   2 +-
 arch/arm64/include/asm/sysreg.h        |   8 +++
 arch/arm64/kernel/head.S               | 118 +++++++++++++++++++++------------
 arch/arm64/kernel/hibernate-asm.S      |  12 ++--
 arch/arm64/kernel/hibernate.c          |   5 +-
 arch/arm64/kvm/hyp-init.S              |  26 ++++----
 arch/arm64/kvm/hyp/s2-setup.c          |   2 +
 arch/arm64/mm/mmu.c                    |  15 +++--
 arch/arm64/mm/pgd.c                    |   8 +++
 arch/arm64/mm/proc.S                   |  19 +++---
 virt/kvm/arm/arm.c                     |   2 +-
 virt/kvm/arm/mmu.c                     |  12 ++--
 20 files changed, 302 insertions(+), 109 deletions(-)

Signature · 1 line

2.1.4

Quoted 5 lines

Hi Kristina,

I boot tested but on VM and had a couple issues. I will examine and share should the issues be of value.

Tested-by Bob Picco <[email protected]>

Thanks for testing! I assume it was on a VM with less than 52 bits of PA? In any case, let me know if you find any issues.

Quoted 4 lines

I reviewed and thank you. Your effort caused me to return to some code examined/learned during the last few months.

Reviewed-by Bob Picco <[email protected]>

Thanks for reviewing! Hope it was useful.

Kristina

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