lkml.org 
[lkml]   [2019]   [Apr]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] x86/kexec: always ensure EFI systab region is mapped
Date
On 4/22/19 6:28 PM, Kairui Song wrote:
> The reason is the systab region is not mapped by the identity mapping
> provided by kexec. Currently kexec only create identity mapping for
> mem regions, wihch won't cover the systab. So second kernel will be
> accessing a not mapped memory region and cause fault.
> But as kexec tend to pad the map region up to PUD size, the
> systab could be included in the map by accident, so it worked on
> some machines, but that will be broken easily and unstable.

Is the mapping of ACPI tables just by luck, too?

--
Jun'ichi Nomura, NEC Corporation / NEC Solution Innovators, Ltd.

\
 
 \ /
  Last update: 2019-04-23 08:22    [W:0.071 / U:0.980 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site