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 10:36:06 +0800
From:   Baoquan He <bhe@...hat.com>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.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 05/07/22 at 09:42am, Leizhen (ThunderTown) wrote:
> 
> 
> 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.

Let's wait and see how Catalin considers. He may pick these with
minor fix directly or your v25.

> 
> > 
> > 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
>