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

[David Gibson <david@gibson.dropbear.id.au>]

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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 <aik@ozlabs.ru>
> >>
> >> 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.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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