1Xen PVH machine (``xenpvh``) 2========================================= 3 4Xen supports a spectrum of types of guests that vary in how they depend 5on HW virtualization features, emulation models and paravirtualization. 6PVH is a mode that uses HW virtualization features (like HVM) but tries 7to avoid emulation models and instead use passthrough or 8paravirtualized devices. 9 10QEMU can be used to provide PV virtio devices on an emulated PCIe controller. 11That is the purpose of this minimal machine. 12 13Supported devices 14----------------- 15 16The x86 Xen PVH QEMU machine provide the following devices: 17 18- RAM 19- GPEX host bridge 20- virtio-pci devices 21 22The idea is to only connect virtio-pci devices but in theory any compatible 23PCI device model will work depending on Xen and guest support. 24 25Running 26------- 27 28The Xen tools will typically construct a command-line and launch QEMU 29for you when needed. But here's an example of what it can look like in 30case you need to construct one manually: 31 32.. code-block:: console 33 34 qemu-system-i386 -xen-domid 3 -no-shutdown \ 35 -chardev socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-3,server=on,wait=off \ 36 -mon chardev=libxl-cmd,mode=control \ 37 -chardev socket,id=libxenstat-cmd,path=/var/run/xen/qmp-libxenstat-3,server=on,wait=off \ 38 -mon chardev=libxenstat-cmd,mode=control \ 39 -nodefaults \ 40 -no-user-config \ 41 -xen-attach -name g0 \ 42 -vnc none \ 43 -display none \ 44 -device virtio-net-pci,id=nic0,netdev=net0,mac=00:16:3e:5c:81:78 \ 45 -netdev type=tap,id=net0,ifname=vif3.0-emu,br=xenbr0,script=no,downscript=no \ 46 -smp 4,maxcpus=4 \ 47 -nographic \ 48 -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 \ 49 -m 4096 50