Re: [Qemu-devel] spapr guests warn "System page size 0x2000 is not enabled in page_size_mask (0x11000). Performance may be slow" on SPARC hosts

[Alexander Graf]

On 06/15/2017 03:33 PM, Peter Maydell wrote:
> I've just noticed that on a SPARC host, some of the PPC guests
> warn during make check:
>
>    /ppc64/prom-env/pseries:
> qemu-system-ppc64: System page size 0x2000 is not enabled in
> page_size_mask (0x11000). Performance may be slow
>
> Is this really a performance problem on a TCG guest?
> It makes the 'make check' output a bit noisy, but not
> unbearably so.

From what I can tell this really only affects DDW which should be page 
size agnostic when only using emulated devices. Maybe Alexey thought of 
using VFIO-pci devices in a TCG guest?


Alex