KVM guests freeze under upstream kernel

[Michael Ellerman]

Thanks for the report.

My Jenkins does a test boot of a KVM guest, so there must be something different in our setups. Can you tell us all the details of your setup, eg. Hardware, host kernel, qemu, guest kernel etc. Thanks.

cheers

On 20 July 2017 05:46:34 GMT+10:00, joserz at linux.vnet.ibm.com wrote:
>Hello!
>
>We're not able to boot any KVM guest using upstream kernel
>(cb8c65ccff7f77d0285f1b126c72d37b2572c865 - 4.13.0-rc1+).
>After reaching the SLOF initial counting, the guest simply freezes:
>
>SLOF
>**********************************************************************
>QEMU Starting
> Build Date = Mar  3 2017 13:29:19
>  FW Version = git-66d250ef0fd06bb8
>   Press "s" to enter Open Firmware.
>
>   C0360
>
>After bisecting I found the commit:
>
>https://github.com/torvalds/linux/commit/ebd3119
>
>    powerpc/mm: Add devmap support for ppc64
>
>Add support for the devmap bit on PTEs and PMDs for PPC64 Book3S.  This
>    is used to differentiate device backed memory from transparent huge
>pages since they are handled in more or less the same manner by the
>core
>    mm code.
>
>Reverting the commit and rebuilding 4.13.0-rc1+ was enough to make a
>workaround.
>But I'll need some help from you guys in order to solve it.
>
>Thanks!
>
>Jose Ziviani

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