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Message-ID: <20180417152801.GB11166@ak-laptop.emea.nsn-net.net>
Date: Tue, 17 Apr 2018 18:28:01 +0300
From: Aaro Koskinen <aaro.koskinen@...ia.com>
To: Dave Hansen <dave.hansen@...ux.intel.com>,
Ingo Molnar <mingo@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: 4.17-rc1: early boot crash on x86_64 & pti
Hi,
On Tue, Apr 17, 2018 at 06:01:30PM +0300, Aaro Koskinen wrote:
> I'm getting early crash on x86_64 box with 4.17-rc1 and PTI
> enabled. Bisected to:
>
> commit 39114b7a743e6759bab4d96b7d9651d44d17e3f9
> Author: Dave Hansen <dave.hansen@...ux.intel.com>
> Date: Fri Apr 6 13:55:17 2018 -0700
>
> x86/pti: Never implicitly clear _PAGE_GLOBAL for kernel image
[...]
> [ 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.
A.
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