lkml.org 
[lkml]   [2018]   [Jan]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [PATCH v2 07/11] arm64: Add skeleton to harden the branch predictor against aliasing attacks
    From
    Date
    Hi Will,

    On 2018/1/5 21:12, Will Deacon wrote:
    > diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c
    > index 5f7097d0cd12..d99b36555a16 100644
    > --- a/arch/arm64/mm/context.c
    > +++ b/arch/arm64/mm/context.c
    > @@ -246,6 +246,8 @@ asmlinkage void post_ttbr_update_workaround(void)
    > "ic iallu; dsb nsh; isb",
    > ARM64_WORKAROUND_CAVIUM_27456,
    > CONFIG_CAVIUM_ERRATUM_27456));
    > +
    > + arm64_apply_bp_hardening();
    > }

    post_ttbr_update_workaround was used for fix Cavium erratum 2745? so does that
    means, if we do not have this erratum, we do not need arm64_apply_bp_hardening()?
    when mm_swtich and kernel_exit?

    From the code logical, it seems not only related to erratum 2745 anymore?
    should it be renamed?

    Thanks
    Yisheng

    \
     
     \ /
      Last update: 2018-01-18 00:19    [W:4.344 / U:0.152 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site