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e10cd4b009
This defines and exports a platform specific custom vm_get_page_prot() via subscribing ARCH_HAS_VM_GET_PAGE_PROT. This also unsubscribes from config ARCH_HAS_FILTER_PGPROT, after dropping off arch_filter_pgprot() and arch_vm_get_page_prot(). Link: https://lkml.kernel.org/r/20220414062125.609297-6-anshuman.khandual@arm.com Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: David S. Miller <davem@davemloft.net> Cc: Khalid Aziz <khalid.aziz@oracle.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@samba.org> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
35 lines
918 B
C
35 lines
918 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <asm/pgtable.h>
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pgprot_t vm_get_page_prot(unsigned long vm_flags)
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{
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unsigned long val = pgprot_val(protection_map[vm_flags &
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(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]);
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#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
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/*
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* Take the 4 protection key bits out of the vma->vm_flags value and
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* turn them in to the bits that we can put in to a pte.
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*
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* Only override these if Protection Keys are available (which is only
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* on 64-bit).
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*/
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if (vm_flags & VM_PKEY_BIT0)
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val |= _PAGE_PKEY_BIT0;
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if (vm_flags & VM_PKEY_BIT1)
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val |= _PAGE_PKEY_BIT1;
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if (vm_flags & VM_PKEY_BIT2)
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val |= _PAGE_PKEY_BIT2;
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if (vm_flags & VM_PKEY_BIT3)
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val |= _PAGE_PKEY_BIT3;
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#endif
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val = __sme_set(val);
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if (val & _PAGE_PRESENT)
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val &= __supported_pte_mask;
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return __pgprot(val);
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}
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EXPORT_SYMBOL(vm_get_page_prot);
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