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

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Message-ID: <20150327174044.GL12400@redacted.bos.redhat.com>
Date:	Fri, 27 Mar 2015 13:40:44 -0400
From:	Kyle McMartin <kmcmarti@...hat.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	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 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...

--Kyle
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