Reset and re-attach PCI host devices on guest shutdown
When the guest shuts down, we should attempt to restore all PCI host devices to a sane state. In the case of managed hostdevs, we should reset and re-attach the devices. In the case of unmanaged hostdevs, we should just reset them. Note, KVM will already reset assigned devices when the guest shuts down using whatever means it can, so we are only doing it to cover the cases the kernel can't handle. * src/qemu_driver.c: add qemuDomainReAttachHostDevices() and call it from qemudShutdownVMDaemon()
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