From: "H. Peter Anvin" <hpa@zytor.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Gu Zheng <guz.fnst@cn.fujitsu.com>,
Ingo Molnar <mingo@kernel.org>,
Andy Lutomirski <luto@amacapital.net>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
X86 ML <x86@kernel.org>
Subject: Re: [PATCH V1] x86, espfix: postpone the initialization of espfix stack for AP
Date: Wed, 17 Jun 2015 14:11:27 -0700 [thread overview]
Message-ID: <5581E27F.5060800@zytor.com> (raw)
In-Reply-To: <20150617210411.GD16999@pd.tnic>
On 06/17/2015 02:04 PM, Borislav Petkov wrote:
>>
>> It isn't *at all* obvious to me at least that if the GFP_KERNEL
>> allocation fails we may not get rescheduled on another CPU and/or get stuck.
>>
>> I'm starting to think that the right thing to do is to allocate these on
>> the CPU that is bringing up the other CPU, at the same time we allocate
>> the percpu area. This won't affect offline CPUs.
>
> Btw, as part of experimenting for something else, I was able to trigger
> this even on a guest here. It is an insane guest though: 16 NUMA nodes,
> with 8 cores each:
>
Is this reliable?
-hpa
next prev parent reply other threads:[~2015-06-17 21:12 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-14 11:37 [RFC PATCH] x86, espfix: use spin_lock rather than mutex Gu Zheng
2015-05-14 12:26 ` Borislav Petkov
2015-05-14 18:29 ` Ingo Molnar
2015-05-14 21:27 ` Borislav Petkov
2015-05-14 22:13 ` H. Peter Anvin
2015-05-15 6:54 ` Ingo Molnar
2015-05-15 7:27 ` H. Peter Anvin
2015-05-18 19:43 ` Andy Lutomirski
2015-05-19 15:04 ` H. Peter Anvin
2015-05-22 10:13 ` [RFC PATCH] x86, espfix: postpone the initialization of espfix stack for AP Gu Zheng
2015-05-28 1:20 ` Gu Zheng
2015-05-29 1:07 ` Andy Lutomirski
2015-05-29 0:57 ` Gu Zheng
2015-06-02 9:23 ` Gu Zheng
2015-06-02 9:25 ` [RFC PATCH V2] " Gu Zheng
2015-06-02 11:59 ` Ingo Molnar
2015-06-03 9:58 ` Gu Zheng
2015-06-04 9:45 ` [PATCH V1] " Gu Zheng
2015-06-17 5:53 ` Zhu Guihua
2015-06-17 7:27 ` H. Peter Anvin
2015-06-17 21:04 ` Borislav Petkov
2015-06-17 21:11 ` H. Peter Anvin [this message]
2015-06-17 21:50 ` Borislav Petkov
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