On Tue, 2016-09-20 at 15:14 -0400, Laine Stump wrote:
Previously we added a set of EHCI+UHCI controllers to Q35 machines to mimic real hardware as closely as possible, but recent discussions have pointed out that the nec-usb-xhci (USB3) controller is much more virtualization-friendly (uses less CPU), so this patch switches the default for Q35 machinetypes to add an XHCI instead (if it's supported, which it of course *will* be).
Since none of the existing test cases left out USB controllers in the input XML, a new Q35 test case was added which has *no* devices, so ends up with only the defaults always put in by qemu, plus those added by libvirt. --- src/qemu/qemu_domain.c | 10 ++++-- .../qemuxml2argv-q35-default-devices-only.args | 22 ++++++++++++ .../qemuxml2argv-q35-default-devices-only.xml | 18 ++++++++++ tests/qemuxml2argvtest.c | 22 ++++++++++++ .../qemuxml2xmlout-q35-default-devices-only.xml | 40 ++++++++++++++++++++++ tests/qemuxml2xmltest.c | 22 ++++++++++++ 6 files changed, 131 insertions(+), 3 deletions(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-q35-default-devices-only.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-q35-default-devices-only.xml create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-q35-default-devices-only.xml
ACK -- Andrea Bolognani / Red Hat / Virtualization