[RFC v2 0/5] arm64: kvm: reset hyp context for kexec
takahiro.akashi at linaro.org
Mon Mar 30 01:54:29 PDT 2015
On 03/30/2015 04:16 PM, Marc Zyngier wrote:
> On Mon, 30 Mar 2015 02:39:53 +0100
> AKASHI Takahiro <takahiro.akashi at linaro.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?
Hmm... It seems that I was able to reproduce the problem if 64k pages enabled.
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