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Date:   Sat, 8 Jun 2019 11:10:30 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     Baoquan He <bhe@redhat.com>
Cc:     lijiang <lijiang@redhat.com>, linux-kernel@vger.kernel.org,
        kexec@lists.infradead.org, tglx@linutronix.de, mingo@redhat.com,
        akpm@linux-foundation.org, dave.hansen@linux.intel.com,
        luto@kernel.org, peterz@infradead.org, x86@kernel.org,
        hpa@zytor.com, dyoung@redhat.com, Thomas.Lendacky@amd.com
Subject: Re: [PATCH 0/3 v11] add reserved e820 ranges to the kdump kernel
 e820 table
Message-ID: <20190608091030.GB32464@zn.tnic>
References: <20190423013007.17838-1-lijiang@redhat.com>
 <12847a03-3226-0b29-97b5-04d404410147@redhat.com>
 <20190607174211.GN20269@zn.tnic>
 <20190608035451.GB26148@MiWiFi-R3L-srv>
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On Sat, Jun 08, 2019 at 11:54:51AM +0800, Baoquan He wrote:
> Is it a UEFI box?

Yes.

> 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.

> The current kexec code fills boot_params->efi_info->efi_loader_signature,
> but doesn't contruct efi_memmap table. The kexec/kdump kernel will always
> fail to find available slot for KASLR in process_efi_entries.

Kernel has

# CONFIG_RANDOMIZE_BASE is not set

so no KASLR.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.