linux-kernel - Re: [RFC v2 0/5] arm64: kvm: reset hyp context for kexec

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Message-ID: <20150330081613.60ff7dc0@arm.com>
Date:	Mon, 30 Mar 2015 08:16:13 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:	Kyle McMartin <kmcmarti@...hat.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"geoff@...radead.org" <geoff@...radead.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"david.griego@...aro.org" <david.griego@...aro.org>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"freddy77@...il.com" <freddy77@...il.com>
Subject: Re: [RFC v2 0/5] arm64: kvm: reset hyp context for kexec

On Mon, 30 Mar 2015 02:39:53 +0100
AKASHI Takahiro <takahiro.akashi@...aro.org> wrote:

> On 03/28/2015 02:40 AM, Kyle McMartin wrote:
> > On Fri, Mar 27, 2015 at 03:37:04PM +0000, Marc Zyngier wrote:
> >>> [  236.260863] Kernel panic - not syncing: HYP panic:
> >>> [  236.260863] PS:600003c9 PC:000003ffffff0830 ESR:0000000096000006
> >>
> >> It would be interesting if you could find out what you have at offset
> >> 0x830 of hyp-init.o (the stack trace is for EL1, and is not going to
> >> help much).
> >>
> >
> > Given the alignment, i'm going to assume i'm looking at the right thing:
> >
> > 0000000000000820 <__kvm_hyp_reset>:
> >       820:       d51c2000        msr     ttbr0_el2, x0
> >       824:       d5033fdf        isb
> >       828:       d50c871f        tlbi    alle2
> >       82c:       d5033f9f        dsb     sy
> >       830:       10000060        adr     x0, 83c <__kvm_hyp_reset+0x1c>
> >       834:       b3403c01        bfxil   x1, x0, #0, #16
> >       838:       d61f0020        br      x1
> >       83c:       d53c1000        mrs     x0, sctlr_el2
> >
> > but it seems fairly implausible to be trapping on ADR x0, 1f...
> 
> 
> I've never seen this panic on fast model...
> 
> ESR shows that
>    - Exception class: Data abort taken without a change in Exception level
>    - Data fault status code: Translation fault at EL2
> 
> and FAR seems not to be a proper address.

... which is consistent with what we're seeing here (data fault on
something that doesn't generate a load/store). I'm pretty sure the
page tables are screwed.

Have you tested it with 64k pages?

Thanks,

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