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: <5fb40691-e887-a446-8e84-bfdfeaae2e78@arm.com>
Date:   Thu, 21 Jun 2018 10:00:38 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     James Morse <james.morse@....com>, Wei Xu <xuwei5@...ilicon.com>,
        Will Deacon <will.deacon@....com>
Cc:     catalin.marinas@....com, suzuki.poulose@....com,
        dave.martin@....com, mark.rutland@....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.

On 21/06/18 09:38, James Morse wrote:

>> (joyx@...ing-Arch-b) (gcc version 4.9.1 20140505 (prerelease) (crosstool-NG
>> linaro-1.13.1-4.9-2014.05 - Linaro GCC 4.9-2014.05)) #10 SMP PREEMPT Wed Jun 20
>> 23:59:05 CST 2018
> 
>>     [    0.000000] CPU0: using LPI pending table @0x000000007d860000
>>     [    0.000000] GIC: PPI11 is secure or misconfigured
>>     [    0.000000] arch_timer: WARNING: Invalid trigger for IRQ3, assuming level
>> low
>>     [    0.000000] arch_timer: WARNING: Please fix your firmware
>>     [    0.000000] arch_timer: cp15 timer(s) running at 100.00MHz (virt).
> 
> (No idea what these mean, but I doubt they are relevant)

Old (and buggy) QEMU. Nothing to worry about, the kernel (and the vgic)
will do the right thing. A modern QEMU presents the guest with a fixed
DT, removing the warning altogether.

Nothing to do with the issue at hand anyway.

	M.
-- 
Jazz is not dead. It just smells funny...