[RFC v2 0/5] arm64: kvm: reset hyp context for kexec
marc.zyngier at arm.com
Fri Mar 27 10:50:05 PDT 2015
On 27/03/15 17:40, 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...
... unless you've just switched TTBR0_EL2 to something slightly
inappropriate, and conveniently flushed the TLBs. Also, having 0 as the
exception class is fairly indicative you've fetched some crap, which
reinforce my idea that the page tables are pointing to nowhere-land.
I'll try to review the patches next week, maybe I'll spot something by
Jazz is not dead. It just smells funny...
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