linux-kernel - Re: KVM guest sometimes failed to boot because of kernel stack overflow if KPTI is enabled on a hisilicon ARM64 platform.

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Message-ID: <5B339068.5020304@hisilicon.com>
Date:   Wed, 27 Jun 2018 14:26:00 +0100
From:   Wei Xu <xuwei5@...ilicon.com>
To:     James Morse <james.morse@....com>
CC:     Will Deacon <will.deacon@....com>, <mark.rutland@....com>,
        <catalin.marinas@....com>, Linuxarm <linuxarm@...wei.com>,
        Zhangyi ac <zhangyi.ac@...wei.com>, <suzuki.poulose@....com>,
        <marc.zyngier@....com>,
        "Xiongfanggou (James)" <james.xiong@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <dave.martin@....com>,
        "Liyuan (Larry, Turing Solution)" <Larry.T@...wei.com>,
        <libeijian@...ilicon.com>
Subject: Re: KVM guest sometimes failed to boot because of kernel stack
 overflow if KPTI is enabled on a hisilicon ARM64 platform.

Hi James,

On 2018/6/27 9:39, James Morse wrote:
> Hi Wei,
> 
> On 26/06/18 18:47, Will Deacon wrote:
>> On Wed, Jun 27, 2018 at 01:16:44AM +0800, Wei Xu wrote:
>>>     [    0.000000] Booting Linux on physical CPU 0x0000000000 [0x480fd010]
>>>     [    0.000000] Linux version 4.18.0-rc2-58583-g7daf201-dirty
>>
>> I'm still suspicious that this is 4.18-rc2 with "no change on top" ^^^ !
> 
> Some examples:
> 
> For comparison, when I boot v4.17 it looks like this:
> | Linux version 4.17.0 (morse@...chizedek) (gcc version 4.9.3 20141031
> | (prerelease) (Linaro GCC 2014.11)) #9886 SMP PREEMPT Thu Jun 21 10:30:55 BST
> | 2018
> 
> 
> If I apply some extra patches and make some uncommitted changes, it looks like this:
> | Linux version 4.17.0-00025-ga22ca2234824-dirty (morse@...chizedek) (gcc
> | version 4.9.3 20141031 (prerelease) (Linaro GCC 2014.11)) #9887 SMP PREEMPT
> | Thu Jun 21 10:46:22 BST 2018
> 
> 
> Hence we read your '4.17.0-45864-g29dcea8-dirty' line as v4.17 with extra
> patches and uncommited changes, and similar with this v4.18-rc2.
> 
> I agree 7daf201 is the head commit for v4.18-rc2, but something has gone wrong
> here. Could you try building from a fresh clone of Linus' tree?
> 
> (I suspect at some point you've applied a patch, and have then been merging
> upstream, instead of 'fast forwarding')
> 

Thanks for your kindly guidance!
Sorry, I should highlight that I have only updated the default value
of CONFIG_NR_CPUS by menuconfig in the previous mail.
That is why it showed dirty.

Best Regards,
Wei

> 
> 
> Thanks,
> 
> James
> 
> .
>