From: chenzhou <chenzhou10@huawei.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: wangkefeng.wang@huawei.com, linux-doc@vger.kernel.org,
bhsharma@redhat.com, huawei.libin@huawei.com,
guohanjun@huawei.com, will@kernel.org, bhe@redhat.com,
corbet@lwn.net, mingo@redhat.com, dyoung@redhat.com,
John.P.donnelly@oracle.com, arnd@arndb.de, xiexiuqi@huawei.com,
horms@verge.net.au, tglx@linutronix.de,
linux-arm-kernel@lists.infradead.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, robh+dt@kernel.org,
james.morse@arm.com, prabhakar.pkin@gmail.com,
nsaenzjulienne@suse.de
Subject: Re: [PATCH v12 6/9] arm64: kdump: reimplement crashkernel=X
Date: Tue, 6 Oct 2020 09:30:38 +0800 [thread overview]
Message-ID: <65ce0086-b041-8ae4-60df-e29bd2bd985b@huawei.com> (raw)
In-Reply-To: <20201005171608.GC14576@gaia>
On 2020/10/6 1:16, Catalin Marinas wrote:
> On Mon, Sep 07, 2020 at 09:47:42PM +0800, Chen Zhou wrote:
>> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
>> index 53acbeca4f57..1b24072f2bae 100644
>> --- a/arch/arm64/kernel/setup.c
>> +++ b/arch/arm64/kernel/setup.c
>> @@ -238,7 +238,18 @@ static void __init request_standard_resources(void)
>> kernel_data.end <= res->end)
>> request_resource(res, &kernel_data);
>> #ifdef CONFIG_KEXEC_CORE
>> - /* Userspace will find "Crash kernel" region in /proc/iomem. */
>> + /*
>> + * Userspace will find "Crash kernel" or "Crash kernel (low)"
>> + * region in /proc/iomem.
>> + * In order to distinct from the high region and make no effect
>> + * to the use of existing kexec-tools, rename the low region as
>> + * "Crash kernel (low)".
>> + */
>> + if (crashk_low_res.end && crashk_low_res.start >= res->start &&
>> + crashk_low_res.end <= res->end) {
>> + crashk_low_res.name = "Crash kernel (low)";
>> + request_resource(res, &crashk_low_res);
>> + }
> With the changes in this series (including the above), how do the
> current kexec-tools behave? Do they pick just the high region and the
> loaded kernel will subsequently fail to boot?
Yes，just pick the high region and will boot fail if low memory is needed.
Thanks,
Chen Zhou
>
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next prev parent reply other threads:[~2020-10-06 1:32 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-07 13:47 [PATCH v12 0/9] support reserving crashkernel above 4G on arm64 kdump Chen Zhou
2020-09-07 13:47 ` [PATCH v12 1/9] x86: kdump: move CRASH_ALIGN to 2M Chen Zhou
2020-09-08 1:21 ` Dave Young
2020-09-08 3:19 ` chenzhou
2020-09-07 13:47 ` [PATCH v12 2/9] x86: kdump: make the lower bound of crash kernel reservation consistent Chen Zhou
2020-09-07 13:47 ` [PATCH v12 3/9] x86: kdump: use macro CRASH_ADDR_LOW_MAX in functions reserve_crashkernel[_low]() Chen Zhou
2020-09-18 3:01 ` Dave Young
2020-09-18 3:57 ` chenzhou
2020-09-18 5:26 ` Dave Young
2020-09-18 7:25 ` Baoquan He
2020-09-18 8:59 ` chenzhou
2020-09-18 9:06 ` chenzhou
2020-10-05 17:20 ` Catalin Marinas
2020-09-07 13:47 ` [PATCH v12 4/9] x86: kdump: move reserve_crashkernel[_low]() into crash_core.c Chen Zhou
2020-09-07 13:47 ` [PATCH v12 5/9] arm64: kdump: introduce some macroes for crash kernel reservation Chen Zhou
2020-09-07 13:47 ` [PATCH v12 6/9] arm64: kdump: reimplement crashkernel=X Chen Zhou
2020-10-05 17:16 ` Catalin Marinas
2020-10-06 1:30 ` chenzhou [this message]
2020-09-07 13:47 ` [PATCH v12 7/9] kdump: add threshold for the required memory Chen Zhou
2020-10-05 17:12 ` Catalin Marinas
2020-10-06 1:34 ` chenzhou
2020-09-07 13:47 ` [PATCH v12 8/9] arm64: kdump: add memory for devices by DT property linux, usable-memory-range Chen Zhou
2020-09-07 13:47 ` [PATCH v12 9/9] kdump: update Documentation about crashkernel Chen Zhou
2020-10-05 17:19 ` Catalin Marinas
2020-10-06 2:10 ` chenzhou
2020-10-07 16:24 ` Catalin Marinas
2020-09-12 11:44 ` [PATCH v12 0/9] support reserving crashkernel above 4G on arm64 kdump John Donnelly
2020-10-05 17:09 ` Catalin Marinas
2020-10-05 17:42 ` Bhupesh Sharma
2020-10-06 1:48 ` chenzhou
2020-10-06 18:00 ` Catalin Marinas
2020-10-07 7:07 ` Bhupesh Sharma
2020-10-07 16:33 ` Catalin Marinas
2020-10-19 2:43 ` chenzhou
2020-09-15 7:16 ` chenzhou
2020-09-23 17:47 ` John Donnelly
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