From: Zeng Heng <zengheng4@huawei.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Ingo Molnar <mingo@kernel.org>, <michael.roth@amd.com>,
<hpa@zytor.com>, <tglx@linutronix.de>,
<sathyanarayanan.kuppuswamy@linux.intel.com>,
<kirill.shutemov@linux.intel.com>, <jroedel@suse.de>,
<keescook@chromium.org>, <mingo@redhat.com>,
<dave.hansen@linux.intel.com>, <brijesh.singh@amd.com>,
<linux-kernel@vger.kernel.org>, <x86@kernel.org>,
<liwei391@huawei.com>, <xiexiuqi@huawei.com>
Subject: Re: [PATCH -v2] x86/boot/compressed: Register dummy NMI handler in EFI boot loader, to avoid kdump crashes
Date: Thu, 12 Jan 2023 10:07:19 +0800 [thread overview]
Message-ID: <4b3d00ff-fcda-e184-7121-9cd65ed1a602@huawei.com> (raw)
In-Reply-To: <Y72NphKcBMQho02u@zn.tnic>
On 2023/1/11 0:09, Borislav Petkov wrote:
> On Tue, Jan 10, 2023 at 01:57:05PM +0100, Borislav Petkov wrote:
>> I'm doubtful now as you're injecting errors so you're not really in #MC context
>> but in this contrived context which is actually an NMI one. So we need to think
>> about how to fix this case.
> I did some more thinking:
>
> *if* this really is a real issue - and not some silly qemu games - then
> native_machine_crash_shutdown() does all the cleanup before the kdump kernel is
> started.
>
> Any NMI clearing, maybe using iret_to_self() etc, #MC resetting etc should
> happen there and not anywhere else.
You mean native_machine_crash_shutdown() should cleanup the NMI
interrupt status
before enter kexec?
But how about the watchdog raise NMI interrupt after
native_machine_crash_shutdown()
or mce_wrmsrl(MSR_IA32_MCG_STATUS, 0) or any else cleanup function?
B.R.,
Zeng Heng
next prev parent reply other threads:[~2023-01-12 2:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-10 10:27 [PATCH] x86/boot/compressed: Register NMI handler in EFI boot loader Zeng Heng
2023-01-10 10:59 ` Ingo Molnar
2023-01-10 12:01 ` [PATCH -v2] x86/boot/compressed: Register dummy NMI handler in EFI boot loader, to avoid kdump crashes Ingo Molnar
2023-01-10 12:11 ` Borislav Petkov
2023-01-10 12:17 ` Borislav Petkov
2023-01-10 12:34 ` Ingo Molnar
2023-01-10 12:46 ` Borislav Petkov
2023-01-10 12:50 ` Zeng Heng
2023-01-10 12:32 ` Zeng Heng
2023-01-10 12:57 ` Borislav Petkov
2023-01-10 13:42 ` Zeng Heng
2023-01-10 16:09 ` Borislav Petkov
2023-01-12 2:07 ` Zeng Heng [this message]
2023-01-10 14:53 ` Borislav Petkov
2023-01-11 3:46 ` Zeng Heng
2023-01-10 14:06 ` Zeng Heng
2023-01-10 11:41 ` [tip: x86/boot] " tip-bot2 for Zeng Heng
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