linux-kernel - Re: [PATCH 0/3 v11] add reserved e820 ranges to the kdump kernel e820 table

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Message-ID: <20190608100139.GC26148@MiWiFi-R3L-srv>
Date:   Sat, 8 Jun 2019 18:01:39 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     lijiang <lijiang@...hat.com>, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, tglx@...utronix.de, mingo@...hat.com,
        akpm@...ux-foundation.org, dave.hansen@...ux.intel.com,
        luto@...nel.org, peterz@...radead.org, x86@...nel.org,
        hpa@...or.com, dyoung@...hat.com, Thomas.Lendacky@....com
Subject: Re: [PATCH 0/3 v11] add reserved e820 ranges to the kdump kernel
 e820 table

On 06/08/19 at 11:10am, Borislav Petkov wrote:
> On Sat, Jun 08, 2019 at 11:54:51AM +0800, Baoquan He wrote:
> > Is it a UEFI box?
> 
> Yes.

OK, it doesn't matter with uefi since CONFIG_RANDOMIZE_BASE is not set. 


> 
> > If it's uefi machine, it should relate to below issue. Because kexec
> > always fails to randomly choose a new position for kernel.
> 
> The kernel succeeds in selecting a position for the kernel - the kexec
> kernel doesn't load when a panic happens. Rather, the box panics and
> nothing more.

OK, it may be different with the case we met, if panic happened when
load a kdump kernel.

We can load with 'kexec -l' or 'kexec -p', but can't boot after triggering
crash or execute 'kexec -e' to do kexec jumping.