Am Montag, 6. Dezember 2021, 11:49:55 CET schrieb Alexandre ghiti: > On 11/25/21 00:29, Heiko Stübner wrote: > > Am Mittwoch, 29. September 2021, 16:51:03 CET schrieb Alexandre Ghiti: > >> 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. > >> > >> Tested on: > >> - qemu rv64 sv39: OK > >> - qemu rv64 sv48: OK > >> - qemu rv64 sv39 + kasan: OK > >> - qemu rv64 sv48 + kasan: OK > >> - qemu rv32: OK > >> - Unmatched: OK > > On a beagleV (which supports only sv39) I've tested both the limit via > > the mmu-type in the devicetree and also that the fallback works when > > I disable the mmu-type in the dt, so > > > > Tested-by: Heiko Stuebner <heiko@xxxxxxxxx> > > > > Thanks Heiko for testing this, unfortunately I could not add this tag to > the latest version as significant changes came up. > > Thanks again for taking the time to test this, No worries, I can repeat that with your new version :-) Heiko > >> > >> > >> Changes in v2: > >> - Rebase onto for-next > >> - Fix KASAN > >> - Fix stack canary > >> - Get completely rid of MAXPHYSMEM configs > >> - Add documentation > >> > >> Alexandre Ghiti (10): > >> 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 > >> > >> Documentation/riscv/vm-layout.rst | 36 ++ > >> arch/riscv/Kconfig | 35 +- > >> 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 | 2 +- > >> arch/riscv/include/asm/page.h | 10 + > >> arch/riscv/include/asm/pgalloc.h | 40 +++ > >> arch/riscv/include/asm/pgtable-64.h | 108 +++++- > >> arch/riscv/include/asm/pgtable.h | 30 +- > >> 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 | 323 +++++++++++++++--- > >> arch/riscv/mm/kasan_init.c | 91 +++-- > >> drivers/firmware/efi/libstub/efi-stub.c | 2 + > >> include/asm-generic/pgalloc.h | 24 +- > >> include/linux/sizes.h | 1 + > >> 21 files changed, 615 insertions(+), 131 deletions(-) > >> > >> > > > > > > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-riscv >
