xref: /openbmc/qemu/docs/system/i386/xenpvh.rst (revision 2b74dd91)
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