Hi,

Am 06.12.2017 um 15:11 schrieb Andre Przywara:
> while trying to boot 4.15-rc1 on my Calxeda Midway I observed a crash
[snip]

I'm seeing a possibly related crash in 4.15-rc2 on Raspberry Pi 2.
Using its 4.15-rc2 dtb I see a ton of timer interrupt errors (attached)
and then KVM runs into an error in unmap_hyp_range():

[    3.974575] kvm [1]: 8-bit VMID
[    3.977734] kvm [1]: IDMAP page: 401000
[    3.981632] kvm [1]: HYP VA range: c0000000:ffffffff
[    3.987575] kvm [1]: Invalid trigger for IRQ19, assuming level low
[    3.993864] kvm [1]: kvm_arch_timer: error setting vcpu affinity
[    4.000174] Unable to handle kernel paging request at virtual address
ae46a000
[    4.007470] pgd = 6db59d0e
[    4.010206] [ae46a000] *pgd=80000000306003, *pmd=00000000
[    4.015666] Internal error: Oops: 206 [#1] PREEMPT SMP ARM
[    4.021181] Modules linked in:
[    4.024259] CPU: 1 PID: 1 Comm: swapper/0 Not tainted
4.15.0-rc2-2.gef715eb-lpae #1
[    4.031955] Hardware name: BCM2835
[    4.035373] task: 27c0e1b0 task.stack: 6730d7bc
[    4.039936] PC is at unmap_hyp_range+0x130/0x414
[    4.044580] LR is at 0x40000000
[...]
[    4.273820] [<c0425b0c>] (unmap_hyp_range) from [<c0427728>]
(free_hyp_pgds+0x10c/0x18c)
[    4.281965] [<c0427728>] (free_hyp_pgds) from [<c0423338>]
(teardown_hyp_mode+0x28/0x84)
[    4.290109] [<c0423338>] (teardown_hyp_mode) from [<c04256b0>]
(kvm_arch_init+0x324/0x52c)

4.14.3 boots fine on RPi2 with the same dtb.
4.15-rc2 boots fine on RPi3 with its latest dtb.

I'm assuming there's two bugs here, one in the RPi2 dts for the
arch_timer and that error triggering Andre's kvm teardown bug that
hopefully will be fixed with Marc's patch.

Regards,
Andreas

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