upstream PowerPC qemu breakage

[Hollis Blanchard <hollisb@us.ibm.com>]

Hi Avi, we're having a problem with the qemu merge you just did in
kvm-userspace.

Upstream qemu recently added the TCG code generator to phase out dyngen.
When he did that, Fabrice explicitly broke the build every non-x86
architecture, and since you've now pulled that breakage into KVM, we're
stuck in an awkward situation.

In the short term we'll have to fork a working userspace, since we're in
the middle of some other stuff (such as real guest IO, which I think is
pretty important :) .

Long term, one option is to try to define a new qemu target that
completely bypasses the code generation parts of qemu. Anthony did that
for x86 once, but there are at least a couple sticking points; not sure
how long it will take. This is probably the best long-term way to avoid
this situation in the future.

Another long-term option is to fix TCG for PowerPC upstream, and I'm
afraid that isn't feasible.

I guess merging with qemu while it's in a period of massive change
wasn't the most opportune moment. Were there some device model changes
you were eager to pick up?

-- 
Hollis Blanchard
IBM Linux Technology Center


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