Hey Charlie,
On Wed, Jul 26, 2023 at 09:45:55AM -0700, Charlie Jenkins wrote:
Make sv48 the default address space for mmap as some applications currently depend on this assumption. A hint address passed to mmap will cause the largest address space that fits entirely into the hint to be used. If the hint is less than or equal to 1<<38, an sv39 address will be used. An exception is that if the hint address is 0, then a sv48 address will be used. After an address space is completely full, the next smallest address space will be used.
Signed-off-by: Charlie Jenkins charlie@rivosinc.com
arch/riscv/include/asm/elf.h | 2 +- arch/riscv/include/asm/pgtable.h | 13 ++++++++- arch/riscv/include/asm/processor.h | 47 +++++++++++++++++++++++++----- 3 files changed, 53 insertions(+), 9 deletions(-)
diff --git a/arch/riscv/include/asm/elf.h b/arch/riscv/include/asm/elf.h index c24280774caf..5d3368d5585c 100644 --- a/arch/riscv/include/asm/elf.h +++ b/arch/riscv/include/asm/elf.h @@ -49,7 +49,7 @@ extern bool compat_elf_check_arch(Elf32_Ehdr *hdr);
- the loader. We need to make sure that it is out of the way of the program
- that it will "exec", and that there is sufficient room for the brk.
*/ -#define ELF_ET_DYN_BASE ((TASK_SIZE / 3) * 2) +#define ELF_ET_DYN_BASE ((DEFAULT_MAP_WINDOW / 3) * 2) #ifdef CONFIG_64BIT #ifdef CONFIG_COMPAT diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 75970ee2bda2..530f6a171a2b 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -63,12 +63,23 @@
- position vmemmap directly below the VMALLOC region.
*/ #ifdef CONFIG_64BIT +#define VA_BITS_SV39 39 +#define VA_BITS_SV48 48 +#define VA_BITS_SV57 57
+#define VA_USER_SV39 (UL(1) << (VA_BITS_SV39 - 1)) +#define VA_USER_SV48 (UL(1) << (VA_BITS_SV48 - 1)) +#define VA_USER_SV57 (UL(1) << (VA_BITS_SV57 - 1))
#define VA_BITS (pgtable_l5_enabled ? \
57 : (pgtable_l4_enabled ? 48 : 39))
VA_BITS_SV57 : (pgtable_l4_enabled ? VA_BITS_SV48 : VA_BITS_SV39))#else #define VA_BITS 32 #endif
Please, at the very least, build test things for rv32 if you are going to change things in mm: io_uring/io_uring.c:3457:20: error: use of undeclared identifier 'VA_BITS_SV39' io_uring/io_uring.c:3457:20: error: use of undeclared identifier 'VA_BITS_SV39' io_uring/io_uring.c:3457:20: error: use of undeclared identifier 'VA_BITS_SV39' io_uring/io_uring.c:3457:20: error: use of undeclared identifier 'VA_BITS_SV39' io_uring/io_uring.c:3457:20: error: use of undeclared identifier 'VA_BITS_SV39' io_uring/io_uring.c:3457:20: error: use of undeclared identifier 'VA_BITS_SV39' mm/util.c:441:19: error: use of undeclared identifier 'VA_BITS_SV39' mm/util.c:441:19: error: use of undeclared identifier 'VA_BITS_SV39' mm/util.c:441:19: error: use of undeclared identifier 'VA_BITS_SV39' mm/util.c:441:19: error: use of undeclared identifier 'VA_BITS_SV39' mm/util.c:441:19: error: use of undeclared identifier 'VA_BITS_SV39' mm/util.c:441:19: error: use of undeclared identifier 'VA_BITS_SV39' mm/mmap.c:1770:20: error: use of undeclared identifier 'VA_BITS_SV39' mm/mmap.c:1770:20: error: use of undeclared identifier 'VA_BITS_SV39' mm/mmap.c:1770:20: error: use of undeclared identifier 'VA_BITS_SV39' mm/mmap.c:1770:20: error: use of undeclared identifier 'VA_BITS_SV39' mm/mmap.c:1770:20: error: use of undeclared identifier 'VA_BITS_SV39' mm/mmap.c:1770:20: error: use of undeclared identifier 'VA_BITS_SV39'
Thanks, Conor.