lkml.org 
[lkml]   [2018]   [Jun]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [RFC PATCH 02/16] x86/split_lock: Handle #AC exception for split lock in kernel mode
    On Sun, Jun 24, 2018 at 02:55:08AM +0200, Thomas Gleixner wrote:
    > On Sat, 23 Jun 2018, Fenghua Yu wrote:
    > > On Sat, Jun 23, 2018 at 11:17:03AM +0200, Thomas Gleixner wrote:
    > > > On Fri, 22 Jun 2018, Fenghua Yu wrote:
    > It's not treated as failure. The firmware simply does not have an handler
    > for #AC installed and dies. I hope you yelled at the firmware people
    > already.

    I think firmware does handle the split lock in its #AC handler because
    firmware shows the following log and system hangs:

    !!!! IA32 Exception Type - 11(#AC - Alignment Check) CPU Apic ID - 00000014!
    !
    ExceptionData - 00000000
    EIP - 6A9DB6C3, CS - 00000010, EFLAGS - 00010006
    ...

    > If that is a real wide spread issue in practice, then we might have to go
    > for some ugly workarounds, but we won't find out when we add them
    > upfront. So testing will show what's wrong in firmware land and we can
    > handle it from there. It's a completely orthogonal issue and has nothing to
    > do with the core functionality.

    Sure

    Thanks.

    -Fenghua

    \
     
     \ /
      Last update: 2018-06-24 03:18    [W:4.556 / U:0.204 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site