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GPU vendors are moving away from using mdev to create virtual GPUs towards using SRIOV VFs that are vGPUs. In both cases, once created the vGPUs are assigned to guests via <hostdev> (i.e. VFIO device assignment), and inside the guest the devices look identical, but mdev vGPUs are located by QEMU/VFIO using a uuid, while VF vGPUs are located with a PCI address. So although we generally require the device on the source host to exactly match the device on the destination host, in the case of mdev-created vGPU vs. VF vGPU migration *can* potentially work, except that libvirt has a hard-coded check that prevents us from even trying. This patch loosens up that check so that we will allow attempts to migrate a guest from a source host that has mdev-created vGPUs to a destination host that has VF vGPUs (and vice versa). The expectation is that if this doesn't actually work then QEMU will fail and generate an error that we can report. Signed-off-by: Laine Stump <laine@redhat.com> Tested-by: Zhiyi Guo <zhguo@redhat.com> Reviewed-by: Zhiyi Guo <zhguo@redhat.com>
libvirt library code README
===========================
The directory provides the bulk of the libvirt codebase. Everything
except for the libvirtd daemon and client tools. The build uses a
large number of libtool convenience libraries - one for each child
directory, and then links them together for the final libvirt.so,
although some bits get linked directly to libvirtd daemon instead.
The files directly in this directory are supporting the public API
entry points & data structures.
There are two core shared modules to be aware of:
* util/ - a collection of shared APIs that can be used by any
code. This directory is always in the include path
for all things built
* conf/ - APIs for parsing / manipulating all the official XML
files used by the public API. This directory is only
in the include path for driver implementation modules
* vmx/ - VMware VMX config handling (used by esx/ and vmware/)
Then there are the hypervisor implementations:
* bhyve - bhyve - The BSD Hypervisor
* esx/ - VMware ESX and GSX support using vSphere API over SOAP
* hyperv/ - Microsoft Hyper-V support using WinRM
* lxc/ - Linux Native Containers
* openvz/ - OpenVZ containers using cli tools
* qemu/ - QEMU / KVM using qemu CLI/monitor
* remote/ - Generic libvirt native RPC client
* test/ - A "mock" driver for testing
* vbox/ - Virtual Box using native API
* vmware/ - VMware Workstation and Player using the vmrun tool
* xen/ - Xen using hypercalls, XenD SEXPR & XenStore
Finally some secondary drivers that are shared for several HVs.
Currently these are used by LXC, OpenVZ, QEMU and Xen drivers.
The ESX, Hyper-V, Remote, Test & VirtualBox drivers all
implement the secondary drivers directly
* cpu/ - CPU feature management
* interface/ - Host network interface management
* network/ - Virtual NAT networking
* nwfilter/ - Network traffic filtering rules
* node_device/ - Host device enumeration
* secret/ - Secret management
* security/ - Mandatory access control drivers
* storage/ - Storage management drivers
Since both the hypervisor and secondary drivers can be built as
dlopen()able modules, it is *FORBIDDEN* to have build dependencies
between these directories. Drivers are only allowed to depend on
the public API, and the internal APIs in the util/ and conf/
directories