lkml.org 
[lkml]   [2018]   [Jan]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCHv6, RESEND 4/4] x86/boot/compressed/64: Handle 5-level paging boot if kernel is above 4G
On Tue, Jan 23, 2018 at 09:31:16AM -0800, Linus Torvalds wrote:
> On Tue, Jan 23, 2018 at 9:09 AM, Kirill A. Shutemov
> <kirill.shutemov@linux.intel.com> wrote:
> >
> > But if the bootloader put the kernel above 4G (not sure if anybody does
> > this), we would lose control as soon as paging is disabled, because the
> > code becomes unreachable to the CPU.
>
> I do wonder if we need this. Why would a bootloader ever put the data
> above 4G? Does this really happen? Wouldn't it be easier to just say
> "bootloaders better put the kernel in the low 4G"?

I don't know much about bootloaders, but do we even have such guarantee
for in-kernel bootloader -- kexec?

--
Kirill A. Shutemov

\
 
 \ /
  Last update: 2018-01-23 18:38    [W:0.165 / U:0.284 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site