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Re: [Qemu-ppc] [PATCH qemu v3] ppc/spapr: Receive and store device tree

From: Alexey Kardashevskiy
Subject: Re: [Qemu-ppc] [PATCH qemu v3] ppc/spapr: Receive and store device tree blob from SLOF
Date: Tue, 18 Dec 2018 15:30:38 +1100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.3

On 18/12/2018 14:49, David Gibson wrote:
> On Tue, Dec 18, 2018 at 02:04:54PM +1100, Alexey Kardashevskiy wrote:
>> On 18/12/2018 13:09, David Gibson wrote:
>>> On Mon, Dec 17, 2018 at 05:21:33PM +1100, David Gibson wrote:
>>>> On Fri, Dec 14, 2018 at 12:55:20PM +1100, Alexey Kardashevskiy wrote:
>>>>> SLOF receives a device tree and updates it with various properties
>>>>> before switching to the guest kernel and QEMU is not aware of any changes
>>>>> made by SLOF. Since there is no real RTAS (QEMU implements it), it makes
>>>>> sense to pass the SLOF final device tree to QEMU to let it implement
>>>>> RTAS related tasks better, such as PCI host bus adapter hotplug.
>>>>> Specifially, now QEMU can find out the actual XICS phandle (for PHB
>>>>> hotplug) and the RTAS linux,rtas-entry/base properties (for firmware
>>>>> assisted NMI - FWNMI).
>>>>> This stores the initial DT blob in the sPAPR machine and replaces it
>>>>> in the KVMPPC_H_UPDATE_DT (new private hypercall) handler.
>>>>> This adds an @update_dt_enabled machine property to allow backward
>>>>> migration.
>>>>> SLOF already has a hypercall since
>>>>> https://github.com/aik/SLOF/commit/e6fc84652c9c0073f9183
>>>>> This makes use of the new fdt_check_full() helper. In order to allow
>>>>> the configure script to pick the correct DTC version, this adjusts
>>>>> the DTC presense test.
>>>>> Signed-off-by: Alexey Kardashevskiy <address@hidden>
>>>> Applied, thanks.
>>> And now, unapplied.
>>> I don't know quite how, but somehow this patch is causing aarch64
>>> tests to SEGV.
>> /home/aik/p/qemu/configure --target-list=aarch64-softmmu
>> --source-path=/home/aik/p/qemu/ --disable-git-update --with-git=false
>>    --enable-trace-backend=log
>> and
>> make -C /home/aik/pbuild/qemu-localhost-aarch64-rel/ -j24 check
>> did not produce segv. I am running this all on a power8 box + ubuntu
>> 1804, what is your config?
> Hm, curious.  I'm using Fedora 29 on an x86 host.

Fedora 27 on x86_64 is all right too :-/ Let's upgrade...


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