| Message ID | 20210929145113.1935778-1-alexandre.ghiti@canonical.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | Introduce sv48 support without relocatable kernel | expand |
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> > > > 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(-) > >
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(-) >> >> > > >
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 >
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 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(-)