linux-kernel - Re: 4.17-rc1: early boot crash on x86

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Date:   Tue, 17 Apr 2018 08:38:18 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Aaro Koskinen <aaro.koskinen@...ia.com>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: 4.17-rc1: early boot crash on x86_64 & pti

On 04/17/2018 08:28 AM, Aaro Koskinen wrote:
> 
>> [    0.000000] Kernel/User page tables isolation: enabled
>> [    0.000000] ------------[ cut here ]------------
>> [    0.000000] CPA: called for zero pte. vaddr = ffffffff8d000000 cpa->vaddr = ffffffff8d000000
>> [    0.000000] WARNING: CPU: 0 PID: 0 at arch/x86/mm/pageattr.c:1189 __cpa_process_fault+0x4d6/0x510
> I started enabling more .config options, and it seems that enabling
> CONFIG_XEN_PV does some magic to make booting work... But I shouldn't
> need it.

You're using "-cpu host".  What is your host CPU?  Also, could you send
along your .config?

I'll try to reproduce this.