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Date: Thu, 30 Jun 2016 20:56:02 +1000
From: Anton Blanchard <anton@samba.org>
Message-ID: <20160630205602.7d830a02@kryten>
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Subject: Re: [Qemu-devel] [PATCH 2/2] ppc: Fix 64K pages support in full
 emulation
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To: =?UTF-8?B?Q8OpZHJpYw==?= Le Goater <clg@kaod.org>
Cc: David Gibson <david@gibson.dropbear.id.au>, qemu-ppc@nongnu.org, qemu-devel@nongnu.org, Benjamin Herrenschmidt <benh@kernel.crashing.org>

Hi,

> From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> 
> We were always advertising only 4K & 16M. Additionally the code wasn't
> properly matching the page size with the PTE content, which meant we
> could potentially hit an incorrect PTE if the guest used multiple
> sizes.
> 
> Finally, honor the CPU capabilities when decoding the size from the
> SLB so we don't try to use 64K pages on 970.
> 
> This still doesn't add support for MPSS (Multiple Page Sizes per
> Segment)

This is causing issues booting an Ubuntu yakety cloud image. I'm
running on a ppc64le box (I don't think it reproduces on x86-64).

cat << EOF > my-user-data
#cloud-config
password: password
chpasswd: { expire: False }
ssh_pwauth: True
EOF

cloud-localds my-seed.img my-user-data

wget -N https://cloud-images.ubuntu.com/yakkety/current/yakkety-server-cloudimg-ppc64el.img

qemu-system-ppc64 -M pseries -cpu POWER8 -nographic -vga none -m 4G -drive file=test.img -drive file=my-seed.img -net user -net nic

The cloud-init scripts never finish, so the ubuntu user's
password is never updated. With the above cloud config you
should be able to log in with ubuntu/password.

Anton