From: John Donnelly <John.p.donnelly@oracle.com>
To: Baoquan He <bhe@redhat.com>,
Zhen Lei <thunder.leizhen@huawei.com>,
Catalin Marinas <catalin.marinas@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org, Dave Young <dyoung@redhat.com>,
Vivek Goyal <vgoyal@redhat.com>,
Eric Biederman <ebiederm@xmission.com>,
kexec@lists.infradead.org, Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
devicetree@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
linux-doc@vger.kernel.org, Randy Dunlap <rdunlap@infradead.org>,
Feng Zhou <zhoufeng.zf@bytedance.com>,
Kefeng Wang <wangkefeng.wang@huawei.com>,
Chen Zhou <dingguo.cz@antgroup.com>,
Dave Kleikamp <dave.kleikamp@oracle.com>,
John Donnelly <john.p.donnelly@oracle.com>
Subject: Re: [PATCH v24 3/6] arm64: kdump: Reimplement crashkernel=X
Date: Sat, 7 May 2022 12:30:33 -0500 [thread overview]
Message-ID: <b399d57a-3773-a78e-94f7-aa6829568080@oracle.com> (raw)
In-Reply-To: <20220506231032.GA122876@MiWiFi-R3L-srv>
On 5/6/22 6:10 PM, Baoquan He wrote:
> On 05/06/22 at 07:43pm, Zhen Lei wrote:
> ......
>> @@ -118,8 +162,7 @@ static void __init reserve_crashkernel(void)
>> if (crash_base)
>> crash_max = crash_base + crash_size;
>>
>> - /* Current arm64 boot protocol requires 2MB alignment */
>> - crash_base = memblock_phys_alloc_range(crash_size, SZ_2M,
>> + crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
>> crash_base, crash_max);
>> if (!crash_base) {
>> pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
>> @@ -127,6 +170,11 @@ static void __init reserve_crashkernel(void)
>> return;
>> }
>>
>
> There's corner case missed, e.g
> 1) ,high and ,low are specified, CONFIG_ZONE_DMA|DMA32 is not enabled;
> 2) ,high and ,low are specified, the whole system memory is under 4G.
>
> Below judgement can filter them away:
>
> if (crash_base > arm64_dma_phys_limit && crash_low_size &&
> reserve_crashkernel_low(crash_low_size)) {
>
> What's your opinion? Leave it and add document to notice user, or fix it
> with code change >
> I would suggest merging this series, Lei can add this corner case
> handling on top. Since this is a newly added support, we don't have
> to make it one step. Doing step by step can make reviewing easier.
Lets get this added and tested with a broader audience. It has been in
review since March, 4th 2019 - 3+ years. I applaud Zhen for his
endurance and patience in carrying this for so long.
>
>> + if (crash_low_size && reserve_crashkernel_low(crash_low_size)) {
>> + memblock_phys_free(crash_base, crash_size);
>> + return;
>> + }
>> +
>> pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
>> crash_base, crash_base + crash_size, crash_size >> 20);
>>
>> @@ -135,6 +183,9 @@ static void __init reserve_crashkernel(void)
>> * map. Inform kmemleak so that it won't try to access it.
>> */
>> kmemleak_ignore_phys(crash_base);
>> + if (crashk_low_res.end)
>> + kmemleak_ignore_phys(crashk_low_res.start);
>> +
>> crashk_res.start = crash_base;
>> crashk_res.end = crash_base + crash_size - 1;
>> insert_resource(&iomem_resource, &crashk_res);
>> --
>> 2.25.1
>>
>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-05-07 17:34 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-06 11:43 [PATCH v24 0/6] support reserving crashkernel above 4G on arm64 kdump Zhen Lei
2022-05-06 11:43 ` [PATCH v24 1/6] kdump: return -ENOENT if required cmdline option does not exist Zhen Lei
2022-05-06 11:43 ` [PATCH v24 2/6] arm64: Use insert_resource() to simplify code Zhen Lei
2022-05-06 11:43 ` [PATCH v24 3/6] arm64: kdump: Reimplement crashkernel=X Zhen Lei
2022-05-06 23:10 ` Baoquan He
2022-05-07 1:34 ` Leizhen (ThunderTown)
2022-05-07 2:07 ` Baoquan He
2022-05-07 3:37 ` Leizhen (ThunderTown)
2022-05-07 9:35 ` Leizhen (ThunderTown)
2022-05-07 11:49 ` Leizhen (ThunderTown)
2022-05-07 12:20 ` Leizhen (ThunderTown)
2022-05-07 13:22 ` Baoquan He
2022-05-07 17:30 ` John Donnelly [this message]
2022-05-07 18:50 ` Catalin Marinas
2022-05-09 4:04 ` Baoquan He
2022-05-06 11:44 ` [PATCH v24 4/6] of: fdt: Add memory for devices by DT property "linux, usable-memory-range" Zhen Lei
2022-05-06 23:15 ` [PATCH v24 4/6] of: fdt: Add memory for devices by DT property "linux,usable-memory-range" Baoquan He
2022-05-06 11:44 ` [PATCH v24 5/6] of: Support more than one crash kernel regions for kexec -s Zhen Lei
2022-05-06 23:17 ` Baoquan He
2022-05-07 1:42 ` Leizhen (ThunderTown)
2022-05-07 2:36 ` Baoquan He
2022-05-06 11:44 ` [PATCH v24 6/6] docs: kdump: Update the crashkernel description for arm64 Zhen Lei
2022-05-06 23:14 ` Baoquan He
2022-05-07 1:41 ` Leizhen (ThunderTown)
2022-05-07 3:23 ` Leizhen (ThunderTown)
2022-05-07 3:30 ` Baoquan He
2022-05-07 18:22 ` Catalin Marinas
2022-05-09 4:05 ` Baoquan He
2022-05-07 19:12 ` [PATCH v24 0/6] support reserving crashkernel above 4G on arm64 kdump Catalin Marinas
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=b399d57a-3773-a78e-94f7-aa6829568080@oracle.com \
--to=john.p.donnelly@oracle.com \
--cc=bhe@redhat.com \
--cc=bp@alien8.de \
--cc=catalin.marinas@arm.com \
--cc=corbet@lwn.net \
--cc=dave.kleikamp@oracle.com \
--cc=devicetree@vger.kernel.org \
--cc=dingguo.cz@antgroup.com \
--cc=dyoung@redhat.com \
--cc=ebiederm@xmission.com \
--cc=frowand.list@gmail.com \
--cc=hpa@zytor.com \
--cc=kexec@lists.infradead.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=rdunlap@infradead.org \
--cc=robh+dt@kernel.org \
--cc=tglx@linutronix.de \
--cc=thunder.leizhen@huawei.com \
--cc=vgoyal@redhat.com \
--cc=wangkefeng.wang@huawei.com \
--cc=will@kernel.org \
--cc=x86@kernel.org \
--cc=zhoufeng.zf@bytedance.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).