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    SubjectRe: [RFC PATCH v3 02/20] x86: Set the write-protect cache mode for full PAT support
    + Toshi.

    On Wed, Nov 09, 2016 at 06:34:48PM -0600, Tom Lendacky wrote:
    > For processors that support PAT, set the write-protect cache mode
    > (_PAGE_CACHE_MODE_WP) entry to the actual write-protect value (x05).
    >
    > Acked-by: Borislav Petkov <bp@suse.de>
    > Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
    > ---
    > arch/x86/mm/pat.c | 4 ++--
    > 1 file changed, 2 insertions(+), 2 deletions(-)
    >
    > diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
    > index 170cc4f..87e8952 100644
    > --- a/arch/x86/mm/pat.c
    > +++ b/arch/x86/mm/pat.c
    > @@ -355,7 +355,7 @@ void pat_init(void)
    > * 010 2 UC-: _PAGE_CACHE_MODE_UC_MINUS
    > * 011 3 UC : _PAGE_CACHE_MODE_UC
    > * 100 4 WB : Reserved
    > - * 101 5 WC : Reserved
    > + * 101 5 WP : _PAGE_CACHE_MODE_WP
    > * 110 6 UC-: Reserved
    > * 111 7 WT : _PAGE_CACHE_MODE_WT
    > *
    > @@ -363,7 +363,7 @@ void pat_init(void)
    > * corresponding types in the presence of PAT errata.
    > */
    > pat = PAT(0, WB) | PAT(1, WC) | PAT(2, UC_MINUS) | PAT(3, UC) |
    > - PAT(4, WB) | PAT(5, WC) | PAT(6, UC_MINUS) | PAT(7, WT);
    > + PAT(4, WB) | PAT(5, WP) | PAT(6, UC_MINUS) | PAT(7, WT);
    > }
    >
    > if (!boot_cpu_done) {
    >
    >

    --
    Regards/Gruss,
    Boris.

    Good mailing practices for 400: avoid top-posting and trim the reply.

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