Hi Anup, On Thu, Mar 23, 2023 at 1:18 PM Anup Patel <apatel@xxxxxxxxxxxxxxxx> wrote: > > Hi Alex, > > On Thu, Mar 16, 2023 at 6:48 PM Alexandre Ghiti <alexghiti@xxxxxxxxxxxx> wrote: > > > > This patchset intends to improve tlb utilization by using hugepages for > > the linear mapping. > > > > As reported by Anup in v6, when STRICT_KERNEL_RWX is enabled, we must > > take care of isolating the kernel text and rodata so that they are not > > mapped with a PUD mapping which would then assign wrong permissions to > > the whole region: it is achieved by introducing a new memblock API. > > > > Another patch makes use of this new API in arm64 which used some sort of > > hack to solve this issue: it was built/boot tested successfully. > > > > base-commit-tag: v6.3-rc1 > > > > v8: > > - Fix rv32, as reported by Anup > > - Do not modify memblock_isolate_range and fixes comment, as suggested by Mike > > - Use the new memblock API for crash kernel too in arm64, as suggested by Andrew > > - Fix arm64 double mapping (which to me did not work in v7), but ends up not > > being pretty at all, will wait for comments from arm64 reviewers, but > > this patch can easily be dropped if they do not want it. > > > > v7: > > - Fix Anup bug report by introducing memblock_isolate_memory which > > allows us to split the memblock mappings and then avoid to map the > > the PUD which contains the kernel as read only > > - Add a patch to arm64 to use this newly introduced API > > > > v6: > > - quiet LLVM warning by casting phys_ram_base into an unsigned long > > > > v5: > > - Fix nommu builds by getting rid of riscv_pfn_base in patch 1, thanks > > Conor > > - Add RB from Andrew > > > > v4: > > - Rebase on top of v6.2-rc3, as noted by Conor > > - Add Acked-by Rob > > > > v3: > > - Change the comment about initrd_start VA conversion so that it fits > > ARM64 and RISCV64 (and others in the future if needed), as suggested > > by Rob > > > > v2: > > - Add a comment on why RISCV64 does not need to set initrd_start/end that > > early in the boot process, as asked by Rob > > > > Alexandre Ghiti (4): > > riscv: Get rid of riscv_pfn_base variable > > mm: Introduce memblock_isolate_memory > > arm64: Make use of memblock_isolate_memory for the linear mapping > > riscv: Use PUD/P4D/PGD pages for the linear mapping > > Kernel boot fine on RV64 but there is a failure which is still not > addressed. You can see this failure as following message in > kernel boot log: > 0.000000] Failed to add a System RAM resource at 80200000 Hmmm I don't get that in any of my test configs, would you mind sharing yours and your qemu command line? Thanks > > Regards, > Anup > > > > > arch/arm64/mm/mmu.c | 25 +++++++++++------ > > arch/riscv/include/asm/page.h | 19 +++++++++++-- > > arch/riscv/mm/init.c | 53 ++++++++++++++++++++++++++++------- > > arch/riscv/mm/physaddr.c | 16 +++++++++++ > > drivers/of/fdt.c | 11 ++++---- > > include/linux/memblock.h | 1 + > > mm/memblock.c | 20 +++++++++++++ > > 7 files changed, 119 insertions(+), 26 deletions(-) > > > > -- > > 2.37.2 > >
