lkml.org 
[lkml]   [2017]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRE: [PATCH 3/4] RISC-V: Flush I$ when making a dirty page executable
    Date
    From: Palmer Dabbelt
    > Sent: 20 November 2017 18:58
    >
    > The RISC-V ISA allows for instruction caches that are not coherent WRT
    > stores, even on a single hart. As a result, we need to explicitly flush
    > the instruction cache whenever marking a dirty page as executable in
    > order to preserve the correct system behavior.

    Isn't the I-flush only needed if there has been an unmap since the
    previous I-flush?
    Since code is rarely unmapped (exec and driver unload come to mind)
    the I-flush won't be needed very often.

    David

    \
     
     \ /
      Last update: 2017-11-21 17:57    [W:4.510 / U:0.212 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site