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SubjectRe: [PATCH v3 00/13] Introduce sv48 support without relocatable kernel
From
And I messed Atish address, I was pretty sure I could recall it without 
checking, I guess I'm wrong :)

Sorry for the noise,

Alex

On 12/6/21 11:46, Alexandre Ghiti wrote:
> * Please note notable changes in memory layouts and kasan population *
>
> This patchset allows to have a single kernel for sv39 and sv48 without
> being relocatable.
>
> The idea comes from Arnd Bergmann who suggested to do the same as x86,
> that is mapping the kernel to the end of the address space, which allows
> the kernel to be linked at the same address for both sv39 and sv48 and
> then does not require to be relocated at runtime.
>
> This implements sv48 support at runtime. The kernel will try to
> boot with 4-level page table and will fallback to 3-level if the HW does not
> support it. Folding the 4th level into a 3-level page table has almost no
> cost at runtime.
>
> Note that kasan region had to be moved to the end of the address space
> since its location must be known at compile-time and then be valid for
> both sv39 and sv48 (and sv57 that is coming).
>
> Tested on:
> - qemu rv64 sv39: OK
> - qemu rv64 sv48: OK
> - qemu rv64 sv39 + kasan: OK
> - qemu rv64 sv48 + kasan: OK
> - qemu rv32: OK
>
> Changes in v3:
> - Fix SZ_1T, thanks to Atish
> - Fix warning create_pud_mapping, thanks to Atish
> - Fix k210 nommu build, thanks to Atish
> - Fix wrong rebase as noted by Samuel
> - * Downgrade to sv39 is only possible if !KASAN (see commit changelog) *
> - * Move KASAN next to the kernel: virtual layouts changed and kasan population *
>
> Changes in v2:
> - Rebase onto for-next
> - Fix KASAN
> - Fix stack canary
> - Get completely rid of MAXPHYSMEM configs
> - Add documentation
>
> Alexandre Ghiti (13):
> riscv: Move KASAN mapping next to the kernel mapping
> riscv: Split early kasan mapping to prepare sv48 introduction
> riscv: Introduce functions to switch pt_ops
> riscv: Allow to dynamically define VA_BITS
> riscv: Get rid of MAXPHYSMEM configs
> asm-generic: Prepare for riscv use of pud_alloc_one and pud_free
> riscv: Implement sv48 support
> riscv: Use pgtable_l4_enabled to output mmu_type in cpuinfo
> riscv: Explicit comment about user virtual address space size
> riscv: Improve virtual kernel memory layout dump
> Documentation: riscv: Add sv48 description to VM layout
> riscv: Initialize thread pointer before calling C functions
> riscv: Allow user to downgrade to sv39 when hw supports sv48 if !KASAN
>
> Documentation/riscv/vm-layout.rst | 48 ++-
> arch/riscv/Kconfig | 37 +-
> arch/riscv/configs/nommu_k210_defconfig | 1 -
> .../riscv/configs/nommu_k210_sdcard_defconfig | 1 -
> arch/riscv/configs/nommu_virt_defconfig | 1 -
> arch/riscv/include/asm/csr.h | 3 +-
> arch/riscv/include/asm/fixmap.h | 1
> arch/riscv/include/asm/kasan.h | 11 +-
> arch/riscv/include/asm/page.h | 20 +-
> arch/riscv/include/asm/pgalloc.h | 40 ++
> arch/riscv/include/asm/pgtable-64.h | 108 ++++-
> arch/riscv/include/asm/pgtable.h | 47 +-
> arch/riscv/include/asm/sparsemem.h | 6 +-
> arch/riscv/kernel/cpu.c | 23 +-
> arch/riscv/kernel/head.S | 4 +-
> arch/riscv/mm/context.c | 4 +-
> arch/riscv/mm/init.c | 408 ++++++++++++++----
> arch/riscv/mm/kasan_init.c | 250 ++++++++---
> drivers/firmware/efi/libstub/efi-stub.c | 2
> drivers/pci/controller/pci-xgene.c | 2 +-
> include/asm-generic/pgalloc.h | 24 +-
> include/linux/sizes.h | 1
> 22 files changed, 833 insertions(+), 209 deletions(-)
>
> --
> 2.32.0
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

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