• Rick Edgecombe's avatar
    x86/mm/cpa: Add set_direct_map_*() functions · d253ca0c
    Rick Edgecombe authored
    Add two new functions set_direct_map_default_noflush() and
    set_direct_map_invalid_noflush() for setting the direct map alias for the
    page to its default valid permissions and to an invalid state that cannot
    be cached in a TLB, respectively. These functions do not flush the TLB.
    
    Note, __kernel_map_pages() does something similar but flushes the TLB and
    doesn't reset the permission bits to default on all architectures.
    
    Also add an ARCH config ARCH_HAS_SET_DIRECT_MAP for specifying whether
    these have an actual implementation or a default empty one.
    Signed-off-by: default avatarRick Edgecombe <rick.p.edgecombe@intel.com>
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: <akpm@linux-foundation.org>
    Cc: <ard.biesheuvel@linaro.org>
    Cc: <deneen.t.dock@intel.com>
    Cc: <kernel-hardening@lists.openwall.com>
    Cc: <kristen@linux.intel.com>
    Cc: <linux_dti@icloud.com>
    Cc: <will.deacon@arm.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Nadav Amit <nadav.amit@gmail.com>
    Cc: Rik van Riel <riel@surriel.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: https://lkml.kernel.org/r/20190426001143.4983-15-namit@vmware.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    d253ca0c
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