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4867fbbdd6
This moves protection_map[] inside the platform and makes it a static. This also defines a helper function add_encrypt_protection_map() that can update the protection_map[] array with pgprot_encrypted(). Link: https://lkml.kernel.org/r/20220711070600.2378316-7-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Brian Cain <bcain@quicinc.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Christoph Hellwig <hch@infradead.org> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
63 lines
1.8 KiB
C
63 lines
1.8 KiB
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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#include <asm/mem_encrypt.h>
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static pgprot_t protection_map[16] __ro_after_init = {
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[VM_NONE] = PAGE_NONE,
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[VM_READ] = PAGE_READONLY,
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[VM_WRITE] = PAGE_COPY,
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[VM_WRITE | VM_READ] = PAGE_COPY,
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[VM_EXEC] = PAGE_READONLY_EXEC,
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[VM_EXEC | VM_READ] = PAGE_READONLY_EXEC,
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[VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
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[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC,
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[VM_SHARED] = PAGE_NONE,
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[VM_SHARED | VM_READ] = PAGE_READONLY,
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[VM_SHARED | VM_WRITE] = PAGE_SHARED,
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[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
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[VM_SHARED | VM_EXEC] = PAGE_READONLY_EXEC,
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[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_EXEC,
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[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC,
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[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC
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};
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void add_encrypt_protection_map(void)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(protection_map); i++)
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protection_map[i] = pgprot_encrypted(protection_map[i]);
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}
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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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