Re: [PATCHv7] x86/kdump: bugfix, make the behavior of crashkernel=X consistent with kaslr
From: Dave Young
Date: Wed Feb 20 2019 - 04:42:02 EST
On 02/20/19 at 09:32am, Borislav Petkov wrote:
> On Mon, Feb 18, 2019 at 09:48:20AM +0800, Dave Young wrote:
> > It is ideal if kernel can do it automatically, but I'm not sure if
> > kernel can predict the swiotlb reserved size automatically.
> Do you see how even more absurd this gets?
> If the kernel cannot know the swiotlb reserved size automatically, how
> is the normal user even supposed to know?!
> I see swiotlb_size_or_default() so we have a sane default which we fall
> back to. Now where's the problem with that?
Good question, I expect some answer from people who know more about the
background. It would be good to have some actual test results, Pingfan
is trying to do some tests.
Previously Joerg posted below patch, maybe he has some idea. Joerg?
Author: Joerg Roedel <jroedel@xxxxxxx>
Date: Wed Jun 10 17:49:42 2015 +0200
x86/crash: Allocate enough low memory when crashkernel=high