Re: [PATCH v2 00/10] Introduce sv48 support without relocatable kernel

Heiko Stübner
2021-12-06T11:17:33Z

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@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,

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@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv
>