[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20230727-unruffled-joyride-410fc348ce7b@spud>
Date: Thu, 27 Jul 2023 13:33:41 +0100
From: Conor Dooley <conor@...nel.org>
To: Charlie Jenkins <charlie@...osinc.com>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
paul.walmsley@...ive.com, palmer@...osinc.com,
aou@...s.berkeley.edu, anup@...infault.org,
konstantin@...uxfoundation.org, linux-doc@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
mick@....forth.gr, jrtc27@...c27.com, rdunlap@...radead.org,
alexghiti@...osinc.com
Subject: Re: [PATCH v7 1/4] RISC-V: mm: Restrict address space for
sv39,sv48,sv57
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@...osinc.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.
Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)
Powered by blists - more mailing lists