linux-kernel - Re: [PATCHv3 2/2] x86/kdump: bugfix, make the behavior of crashkernel=X consistent with kaslr

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Message-Id: <20181231084608.GB28478@rapoport-lnx>
Date:   Mon, 31 Dec 2018 10:46:09 +0200
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     linux-acpi@...r.kernel.org, linux-mm@...ck.org,
        kexec@...ts.infradead.org, Tang Chen <tangchen@...fujitsu.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Michal Hocko <mhocko@...e.com>,
        Jonathan Corbet <corbet@....net>,
        Yaowei Bai <baiyaowei@...s.chinamobile.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Daniel Vacek <neelx@...hat.com>,
        Mathieu Malaterre <malat@...ian.org>,
        Stefan Agner <stefan@...er.ch>, Dave Young <dyoung@...hat.com>,
        Baoquan He <bhe@...hat.com>, yinghai@...nel.org,
        vgoyal@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 2/2] x86/kdump: bugfix, make the behavior of
 crashkernel=X consistent with kaslr

On Fri, Dec 28, 2018 at 11:00:02AM +0800, Pingfan Liu wrote:
> Customer reported a bug on a high end server with many pcie devices, where
> kernel bootup with crashkernel=384M, and kaslr is enabled. Even
> though we still see much memory under 896 MB, the finding still failed
> intermittently. Because currently we can only find region under 896 MB,
> if w/0 ',high' specified. Then KASLR breaks 896 MB into several parts
> randomly, and crashkernel reservation need be aligned to 128 MB, that's
> why failure is found. It raises confusion to the end user that sometimes
> crashkernel=X works while sometimes fails.
> If want to make it succeed, customer can change kernel option to
> "crashkernel=384M, high". Just this give "crashkernel=xx@yy" a very
> limited space to behave even though its grammer looks more generic.
> And we can't answer questions raised from customer that confidently:
> 1) why it doesn't succeed to reserve 896 MB;
> 2) what's wrong with memory region under 4G;
> 3) why I have to add ',high', I only require 384 MB, not 3840 MB.
> 
> This patch simplifies the method suggested in the mail [1]. It just goes
> bottom-up to find a candidate region for crashkernel. The bottom-up may be
> better compatible with the old reservation style, i.e. still want to get
> memory region from 896 MB firstly, then [896 MB, 4G], finally above 4G.
> 
> There is one trivial thing about the compatibility with old kexec-tools:
> if the reserved region is above 896M, then old tool will fail to load
> bzImage. But without this patch, the old tool also fail since there is no
> memory below 896M can be reserved for crashkernel.
> 
> [1]: http://lists.infradead.org/pipermail/kexec/2017-October/019571.html
> Signed-off-by: Pingfan Liu <kernelfans@...il.com>
> Cc: Tang Chen <tangchen@...fujitsu.com>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Len Brown <lenb@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Mike Rapoport <rppt@...ux.vnet.ibm.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Yaowei Bai <baiyaowei@...s.chinamobile.com>
> Cc: Pavel Tatashin <pasha.tatashin@...cle.com>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: Daniel Vacek <neelx@...hat.com>
> Cc: Mathieu Malaterre <malat@...ian.org>
> Cc: Stefan Agner <stefan@...er.ch>
> Cc: Dave Young <dyoung@...hat.com>
> Cc: Baoquan He <bhe@...hat.com>
> Cc: yinghai@...nel.org,
> Cc: vgoyal@...hat.com
> Cc: linux-kernel@...r.kernel.org
> ---
>  arch/x86/kernel/setup.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index d494b9b..165f9c3 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -541,15 +541,18 @@ static void __init reserve_crashkernel(void)
> 
>  	/* 0 means: find the address automatically */
>  	if (crash_base <= 0) {
> +		bool bottom_up = memblock_bottom_up();
> +
> +		memblock_set_bottom_up(true);
>
>  		/*
>  		 * Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
>  		 * as old kexec-tools loads bzImage below that, unless
>  		 * "crashkernel=size[KMG],high" is specified.
>  		 */
>  		crash_base = memblock_find_in_range(CRASH_ALIGN,
> -						    high ? CRASH_ADDR_HIGH_MAX
> -							 : CRASH_ADDR_LOW_MAX,
> -						    crash_size, CRASH_ALIGN);
> +			(max_pfn * PAGE_SIZE), crash_size, CRASH_ALIGN);
> +		memblock_set_bottom_up(bottom_up);

Using bottom-up does not guarantee that the allocation won't fall into a
removable memory, it only makes it highly probable.

I think that the 'max_pfn * PAGE_SIZE' limit should be replaced with the
end of the non-removable memory node.

> +
>  		if (!crash_base) {
>  			pr_info("crashkernel reservation failed - No suitable area found.\n");
>  			return;
> -- 
> 2.7.4
> 

-- 
Sincerely yours,
Mike.