linux-kernel - Re: arm64: kernel v4.6-rc1 hangs on QEMU

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Message-ID: <3334343.7r57EH3qRj@wuerfel>
Date:	Wed, 30 Mar 2016 00:32:42 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Yury Norov <ynorov@...iumnetworks.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	alexey.klimov@...aro.org
Subject: Re: arm64: kernel v4.6-rc1 hangs on QEMU

On Wednesday 30 March 2016 01:22:17 Yury Norov wrote:
> > 
> > Undefined instruction in cpuinfo_store_boot_cpu() could be related
> > to the SYS_ID_AA64MMFR2_EL1 access that was recently added.
> > 
> > What does the architecture say about reading unknown cpuid registers?
> > 
> >       Arnd
> 
> ThunderX has some unimplemented system registers. AFAIR, attempt to access it
> causes data abort.

Ok, if that is the case, maybe the read_cpuid() macro can be changed
so it contains a fixup for the trap? That should handle both data abort
and undefinstr.

	Arnd