The way to check upstream qemu's git HEAD is:
sudo apt-get build-dep qemu-kvm
sudo apt-get install git
git clone git://git.qemu.org/qemu.git
cd qemu
./configure --target-list=x86_64-softmmu
make
then run it as
cd x86_64-softmmu
./qemu-system-x86_64 --enable-kvm (existing-arguments)
or if you are using libvirt, you should be able to
cd x86_64-softmmu
sudo mv /usr/bin/kvm /usr/bin/kvm.orig
sudo ln -s $(pwd)/qemu-system-x86_64 /usr/bin/kvm
then test, then
sudo rm /usr/bin/kvm
sudo mv /usr/bin/kvm.orig /usr/bin/kvm
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https://bugs.launchpad.net/bugs/1071011
Title:
specific device not available in client (passthrough) with high cpu
load on host, none in client
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