| Xen PVH machine (``xenpvh``) |
| ========================================= |
| |
| Xen supports a spectrum of types of guests that vary in how they depend |
| on HW virtualization features, emulation models and paravirtualization. |
| PVH is a mode that uses HW virtualization features (like HVM) but tries |
| to avoid emulation models and instead use passthrough or |
| paravirtualized devices. |
| |
| QEMU can be used to provide PV virtio devices on an emulated PCIe controller. |
| That is the purpose of this minimal machine. |
| |
| Supported devices |
| ----------------- |
| |
| The x86 Xen PVH QEMU machine provide the following devices: |
| |
| - RAM |
| - GPEX host bridge |
| - virtio-pci devices |
| |
| The idea is to only connect virtio-pci devices but in theory any compatible |
| PCI device model will work depending on Xen and guest support. |
| |
| Running |
| ------- |
| |
| The Xen tools will typically construct a command-line and launch QEMU |
| for you when needed. But here's an example of what it can look like in |
| case you need to construct one manually: |
| |
| .. code-block:: console |
| |
| qemu-system-i386 -xen-domid 3 -no-shutdown \ |
| -chardev socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-3,server=on,wait=off \ |
| -mon chardev=libxl-cmd,mode=control \ |
| -chardev socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-3,server=on,wait=off \ |
| -mon chardev=libxenstat-cmd,mode=control \ |
| -nodefaults \ |
| -no-user-config \ |
| -xen-attach -name g0 \ |
| -vnc none \ |
| -display none \ |
| -device virtio-net-pci,id=nic0,netdev=net0,mac=00:16:3e:5c:81:78 \ |
| -netdev type=tap,id=net0,ifname=vif3.0-emu,br=xenbr0,script=no,downscript=no \ |
| -smp 4,maxcpus=4 \ |
| -nographic \ |
| -machine xenpvh,ram-low-base=0,ram-low-size=2147483648,ram-high-base=4294967296,ram-high-size=2147483648,pci-ecam-base=824633720832,pci-ecam-size=268435456,pci-mmio-base=4026531840,pci-mmio-size=33554432,pci-mmio-high-base=824902156288,pci-mmio-high-size=68719476736 \ |
| -m 4096 |
