Messages in this thread | | | Date | Mon, 6 Dec 2021 12:08:19 +0100 | Subject | Re: [PATCH v3 00/13] Introduce sv48 support without relocatable kernel | From | Alexandre ghiti <> |
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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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