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Re: [Qemu-devel] [PATCH 2/2] ppc: Fix 64K pages support in full emulatio

From: Anton Blanchard
Subject: Re: [Qemu-devel] [PATCH 2/2] ppc: Fix 64K pages support in full emulation
Date: Thu, 30 Jun 2016 20:56:02 +1000


> From: Benjamin Herrenschmidt <address@hidden>
> 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
password: password
chpasswd: { expire: False }
ssh_pwauth: True

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

wget -N 

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.


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