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    Subject[tip:x86/mm] x86/boot/e820: Add support to determine the E820 type of an address
    Commit-ID:  d68baa3fa6e4d703fd0c7954ee5c739789e7242f
    Gitweb: http://git.kernel.org/tip/d68baa3fa6e4d703fd0c7954ee5c739789e7242f
    Author: Tom Lendacky <thomas.lendacky@amd.com>
    AuthorDate: Mon, 17 Jul 2017 16:10:12 -0500
    Committer: Ingo Molnar <mingo@kernel.org>
    CommitDate: Tue, 18 Jul 2017 11:38:01 +0200

    x86/boot/e820: Add support to determine the E820 type of an address

    Add a function that will return the E820 type associated with an address
    range.

    Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
    Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
    Reviewed-by: Borislav Petkov <bp@suse.de>
    Cc: Alexander Potapenko <glider@google.com>
    Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Arnd Bergmann <arnd@arndb.de>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brijesh Singh <brijesh.singh@amd.com>
    Cc: Dave Young <dyoung@redhat.com>
    Cc: Dmitry Vyukov <dvyukov@google.com>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Cc: Larry Woodman <lwoodman@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Matt Fleming <matt@codeblueprint.co.uk>
    Cc: Michael S. Tsirkin <mst@redhat.com>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Radim Krčmář <rkrcmar@redhat.com>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: Toshimitsu Kani <toshi.kani@hpe.com>
    Cc: kasan-dev@googlegroups.com
    Cc: kvm@vger.kernel.org
    Cc: linux-arch@vger.kernel.org
    Cc: linux-doc@vger.kernel.org
    Cc: linux-efi@vger.kernel.org
    Cc: linux-mm@kvack.org
    Link: http://lkml.kernel.org/r/b797aaa588803bf33263d5dd8c32377668fa931a.1500319216.git.thomas.lendacky@amd.com
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    ---
    arch/x86/include/asm/e820/api.h | 2 ++
    arch/x86/kernel/e820.c | 26 +++++++++++++++++++++++---
    2 files changed, 25 insertions(+), 3 deletions(-)

    diff --git a/arch/x86/include/asm/e820/api.h b/arch/x86/include/asm/e820/api.h
    index a504adc..cd266d8 100644
    --- a/arch/x86/include/asm/e820/api.h
    +++ b/arch/x86/include/asm/e820/api.h
    @@ -39,6 +39,8 @@ extern void e820__setup_pci_gap(void);
    extern void e820__reallocate_tables(void);
    extern void e820__register_nosave_regions(unsigned long limit_pfn);

    +extern int e820__get_entry_type(u64 start, u64 end);
    +
    /*
    * Returns true iff the specified range [start,end) is completely contained inside
    * the ISA region.
    diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
    index 532da61..71c11ad 100644
    --- a/arch/x86/kernel/e820.c
    +++ b/arch/x86/kernel/e820.c
    @@ -96,7 +96,8 @@ EXPORT_SYMBOL_GPL(e820__mapped_any);
    * Note: this function only works correctly once the E820 table is sorted and
    * not-overlapping (at least for the range specified), which is the case normally.
    */
    -bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type)
    +static struct e820_entry *__e820__mapped_all(u64 start, u64 end,
    + enum e820_type type)
    {
    int i;

    @@ -122,9 +123,28 @@ bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type)
    * coverage of the desired range exists:
    */
    if (start >= end)
    - return 1;
    + return entry;
    }
    - return 0;
    +
    + return NULL;
    +}
    +
    +/*
    + * This function checks if the entire range <start,end> is mapped with type.
    + */
    +bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type)
    +{
    + return __e820__mapped_all(start, end, type);
    +}
    +
    +/*
    + * This function returns the type associated with the range <start,end>.
    + */
    +int e820__get_entry_type(u64 start, u64 end)
    +{
    + struct e820_entry *entry = __e820__mapped_all(start, end, 0);
    +
    + return entry ? entry->type : -EINVAL;
    }

    /*
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