linux-kernel - Re: [PATCH v24 5/6] of: Support more than one crash kernel regions for kexec -s

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Date:   Sat, 7 May 2022 09:42:43 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Baoquan He <bhe@...hat.com>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        <x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>,
        <linux-kernel@...r.kernel.org>, Dave Young <dyoung@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        <kexec@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        <devicetree@...r.kernel.org>, "Jonathan Corbet" <corbet@....net>,
        <linux-doc@...r.kernel.org>, Randy Dunlap <rdunlap@...radead.org>,
        Feng Zhou <zhoufeng.zf@...edance.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Chen Zhou <dingguo.cz@...group.com>,
        "John Donnelly" <John.p.donnelly@...cle.com>,
        Dave Kleikamp <dave.kleikamp@...cle.com>
Subject: Re: [PATCH v24 5/6] of: Support more than one crash kernel regions
 for kexec -s



On 2022/5/7 7:17, Baoquan He wrote:
> On 05/06/22 at 07:44pm, Zhen Lei wrote:
>> When "crashkernel=X,high" is used, there may be two crash regions:
>> high=crashk_res and low=crashk_low_res. But now the syscall
>> kexec_file_load() only add crashk_res into "linux,usable-memory-range",
>> this may cause the second kernel to have no available dma memory.
>>
>> Fix it like kexec tool do for option -c, add both 'high' and 'low' regions
>               ~~~~~~~~~~~~ 
>               kexec-tools does

OK, I will update it. Thanks.

> 
> Other than this, LGTM,
> 
> Acked-by: Baoquan He <bhe@...hat.com>
> 
>> into the dtb.
>>
>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>> Acked-by: Rob Herring <robh@...nel.org>
>> ---
>>  drivers/of/kexec.c | 9 +++++++++
>>  1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
>> index b9bd1cff179388c..8d374cc552be5f2 100644
>> --- a/drivers/of/kexec.c
>> +++ b/drivers/of/kexec.c
>> @@ -386,6 +386,15 @@ void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
>>  				crashk_res.end - crashk_res.start + 1);
>>  		if (ret)
>>  			goto out;
>> +
>> +		if (crashk_low_res.end) {
>> +			ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
>> +					"linux,usable-memory-range",
>> +					crashk_low_res.start,
>> +					crashk_low_res.end - crashk_low_res.start + 1);
>> +			if (ret)
>> +				goto out;
>> +		}
>>  	}
>>  
>>  	/* add bootargs */
>> -- 
>> 2.25.1
>>
> 
> .
> 

-- 
Regards,
  Zhen Lei