linux-kernel - Re: [PATCHv7] x86/kdump: bugfix, make the behavior of crashkernel=X consistent with kaslr

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Message-ID: <20190131105019.GB6749@zn.tnic>
Date:   Thu, 31 Jan 2019 11:50:19 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     kexec@...ts.infradead.org, Dave Young <dyoung@...hat.com>,
        Baoquan He <bhe@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Yinghai Lu <yinghai@...nel.org>, vgoyal@...hat.com,
        Randy Dunlap <rdunlap@...radead.org>, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv7] x86/kdump: bugfix, make the behavior of crashkernel=X
 consistent with kaslr

On Tue, Jan 29, 2019 at 01:51:45PM +0800, Pingfan Liu wrote:
> Sorry, can not catch up with you. Do you suggestion
> memblock_find_in_range(0, kernel_start) and
> memblock_find_in_range(kernel_end, mem_end)? But the memory is
> truncated into fraction by many component which call
> memblock_reserve(), besides kernel.

extract_kernel() selects the physical address where the place the
kernel. You can use that physical address to figure out where to
allocate the crash kernel range.

-- 
Regards/Gruss,
    Boris.

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