Messages in this thread | | | Date | Mon, 6 Dec 2021 11:49:55 +0100 | Subject | Re: [PATCH v2 00/10] Introduce sv48 support without relocatable kernel | From | 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@sntech.de> >
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,
Alex
>> >> >> 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(-) >> >> > > >
| |