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: <ebfabb8f-dcd9-3fb4-3655-368a882d8f09@arm.com>
Date:   Wed, 20 Jun 2018 16:54:57 +0100
From:   James Morse <james.morse@....com>
To:     Wei Xu <xuwei5@...ilicon.com>
Cc:     Will Deacon <will.deacon@....com>, catalin.marinas@....com,
        suzuki.poulose@....com, dave.martin@....com, mark.rutland@....com,
        marc.zyngier@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Linuxarm <linuxarm@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>, xiexiuqi@...wei.com,
        huangdaode <huangdaode@...ilicon.com>,
        "Chenxin (Charles)" <charles.chenxin@...wei.com>,
        "Xiongfanggou (James)" <james.xiong@...wei.com>,
        "Liguozhu (Kenneth)" <liguozhu@...ilicon.com>,
        Zhangyi ac <zhangyi.ac@...wei.com>,
        jonathan.cameron@...wei.com,
        Shameerali Kolothum Thodi 
        <shameerali.kolothum.thodi@...wei.com>,
        John Garry <john.garry@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Shiju Jose <shiju.jose@...wei.com>,
        "Zhuangyuzeng (Yisen)" <yisen.zhuang@...wei.com>,
        "Wangzhou (B)" <wangzhou1@...ilicon.com>,
        "kongxinwei (A)" <kong.kongxinwei@...ilicon.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 Wei,

On 20/06/18 16:52, Wei Xu wrote:
> On 2018/6/20 22:42, Will Deacon wrote:
>> Hmm, I wonder if this is at all related to RAS, since we've just enabled
>> that and if we take a fault whilst rewriting swapper then we're going to
>> get stuck. What happens if you set CONFIG_ARM64_RAS_EXTN=n in the guest?
> 
> I will try it now.

It's not just the Kconfig symbol, could you also revert:

f751daa4f9d3 ("arm64: Unconditionally enable IESB on exception entry/return for
firmware-first")


(reverts and build cleanly on 4.17)


Thanks,

James