From: Catalin Marinas <catalin.marinas@arm.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org,
Christoph Hellwig <hch@infradead.org>,
linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org, sparclinux@vger.kernel.org,
linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
Will Deacon <will@kernel.org>
Subject: Re: [PATCH V4 3/7] arm64/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
Date: Fri, 8 Apr 2022 11:28:11 +0100 [thread overview]
Message-ID: <YlAOO2H/Ay/y9HOv@arm.com> (raw)
In-Reply-To: <20220407103251.1209606-4-anshuman.khandual@arm.com>
On Thu, Apr 07, 2022 at 04:02:47PM +0530, Anshuman Khandual wrote:
> diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c
> index 77ada00280d9..307534fcec00 100644
> --- a/arch/arm64/mm/mmap.c
> +++ b/arch/arm64/mm/mmap.c
> @@ -55,3 +55,36 @@ static int __init adjust_protection_map(void)
> return 0;
> }
> arch_initcall(adjust_protection_map);
> +
> +static pgprot_t arm64_arch_vm_get_page_prot(unsigned long vm_flags)
> +{
> + pteval_t prot = 0;
> +
> + if (vm_flags & VM_ARM64_BTI)
> + prot |= PTE_GP;
> +
> + /*
> + * There are two conditions required for returning a Normal Tagged
> + * memory type: (1) the user requested it via PROT_MTE passed to
> + * mmap() or mprotect() and (2) the corresponding vma supports MTE. We
> + * register (1) as VM_MTE in the vma->vm_flags and (2) as
> + * VM_MTE_ALLOWED. Note that the latter can only be set during the
> + * mmap() call since mprotect() does not accept MAP_* flags.
> + * Checking for VM_MTE only is sufficient since arch_validate_flags()
> + * does not permit (VM_MTE & !VM_MTE_ALLOWED).
> + */
> + if (vm_flags & VM_MTE)
> + prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED);
> +
> + return __pgprot(prot);
> +}
> +
> +pgprot_t vm_get_page_prot(unsigned long vm_flags)
> +{
> + pgprot_t ret = __pgprot(pgprot_val(protection_map[vm_flags &
> + (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) |
> + pgprot_val(arm64_arch_vm_get_page_prot(vm_flags)));
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(vm_get_page_prot);
Could you write all this in a single function? I think I mentioned it in
a previous series (untested):
pgprot_t vm_get_page_prot(unsigned long vm_flags)
{
pteval_t prot = pgprot_val(protection_map[vm_flags &
(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]);
if (vm_flags & VM_ARM64_BTI)
prot |= PTE_GP;
/*
* There are two conditions required for returning a Normal Tagged
* memory type: (1) the user requested it via PROT_MTE passed to
* mmap() or mprotect() and (2) the corresponding vma supports MTE. We
* register (1) as VM_MTE in the vma->vm_flags and (2) as
* VM_MTE_ALLOWED. Note that the latter can only be set during the
* mmap() call since mprotect() does not accept MAP_* flags.
* Checking for VM_MTE only is sufficient since arch_validate_flags()
* does not permit (VM_MTE & !VM_MTE_ALLOWED).
*/
if (vm_flags & VM_MTE)
prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED);
return __pgprot(prot);
}
EXPORT_SYMBOL(vm_get_page_prot);
With that:
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2022-04-08 10:28 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-07 10:32 [PATCH V4 0/7] mm/mmap: Drop arch_vm_get_page_prot() and arch_filter_pgprot() Anshuman Khandual
2022-04-07 10:32 ` [PATCH V4 1/7] mm/mmap: Add new config ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
2022-04-08 9:58 ` Catalin Marinas
2022-04-07 10:32 ` [PATCH V4 2/7] powerpc/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Anshuman Khandual
2022-04-08 12:53 ` Christophe Leroy
2022-04-09 11:36 ` Christophe Leroy
2022-04-11 5:31 ` Anshuman Khandual
2022-04-11 5:44 ` Christophe Leroy
2022-04-07 10:32 ` [PATCH V4 3/7] arm64/mm: " Anshuman Khandual
2022-04-08 10:28 ` Catalin Marinas [this message]
2022-04-08 11:19 ` Anshuman Khandual
2022-04-07 10:32 ` [PATCH V4 4/7] sparc/mm: " Anshuman Khandual
2022-04-07 15:22 ` Khalid Aziz
2022-04-07 10:32 ` [PATCH V4 5/7] x86/mm: " Anshuman Khandual
2022-04-07 10:32 ` [PATCH V4 6/7] mm/mmap: Drop arch_filter_pgprot() Anshuman Khandual
2022-04-08 10:28 ` Catalin Marinas
2022-04-07 10:32 ` [PATCH V4 7/7] mm/mmap: Drop arch_vm_get_page_pgprot() Anshuman Khandual
2022-04-08 10:29 ` Catalin Marinas
2022-04-07 23:20 ` [PATCH V4 0/7] mm/mmap: Drop arch_vm_get_page_prot() and arch_filter_pgprot() Andrew Morton
2022-04-08 2:41 ` Anshuman Khandual
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