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From: Alexandre Ghiti <alexandre.ghiti@canonical.com>
To: Jonathan Corbet <corbet@lwn.net>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>, Zong Li <zong.li@sifive.com>,
	Anup Patel <anup@brainfault.org>,
	Atish Patra <Atish.Patra@wdc.com>, Christoph Hellwig <hch@lst.de>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Ard Biesheuvel <ardb@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Kees Cook <keescook@chromium.org>,
	Guo Ren <guoren@linux.alibaba.com>,
	Heinrich Schuchardt <heinrich.schuchardt@canonical.com>,
	Mayuresh Chitale <mchitale@ventanamicro.com>,
	linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
	linux-efi@vger.kernel.org, linux-arch@vger.kernel.org
Cc: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Subject: [PATCH v2 00/10] Introduce sv48 support without relocatable kernel
Date: Wed, 29 Sep 2021 16:51:03 +0200	[thread overview]
Message-ID: <20210929145113.1935778-1-alexandre.ghiti@canonical.com> (raw)

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(-)

-- 
2.30.2


             reply	other threads:[~2021-09-29 14:51 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29 14:51 Alexandre Ghiti [this message]
2021-09-29 14:51 ` [PATCH v2 01/10] riscv: Allow to dynamically define VA_BITS Alexandre Ghiti
2021-09-29 14:51 ` [PATCH v2 02/10] riscv: Get rid of MAXPHYSMEM configs Alexandre Ghiti
2021-09-29 14:51 ` [PATCH v2 03/10] asm-generic: Prepare for riscv use of pud_alloc_one and pud_free Alexandre Ghiti
2021-09-29 14:51 ` [PATCH v2 04/10] riscv: Implement sv48 support Alexandre Ghiti
2021-10-04  1:34   ` Samuel Holland
2021-10-04  7:31     ` Alexandre Ghiti
2021-09-29 14:51 ` [PATCH v2 05/10] riscv: Use pgtable_l4_enabled to output mmu_type in cpuinfo Alexandre Ghiti
2021-09-29 14:51 ` [PATCH v2 06/10] riscv: Explicit comment about user virtual address space size Alexandre Ghiti
2021-09-29 14:51 ` [PATCH v2 07/10] riscv: Improve virtual kernel memory layout dump Alexandre Ghiti
2021-09-29 14:51 ` [PATCH v2 08/10] Documentation: riscv: Add sv48 description to VM layout Alexandre Ghiti
2021-09-29 14:51 ` [PATCH v2 09/10] riscv: Initialize thread pointer before calling C functions Alexandre Ghiti
2021-09-29 14:51 ` [PATCH v2 10/10] riscv: Allow user to downgrade to sv39 when hw supports sv48 Alexandre Ghiti
2021-11-24 23:29 ` [PATCH v2 00/10] Introduce sv48 support without relocatable kernel Heiko Stübner
2021-12-06 10:49   ` Alexandre ghiti
2021-12-06 11:17     ` Heiko Stübner

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