[libvirt] [PATCH 0/2] qemu: Add support for host-model pseries machine option

This series adds support for the -machine,host-model= QEMU option for for pseries guests. Pseries guests used to have a node (/proc/device-tree/host-model) in device-tree that exposed the host's model string so that guest userspace tools could determine the host machine they were running on. QEMU used to provide the node by default, but this has been disabled due to security concerns. There is now a machine option (host-model) that allows the user to set an arbitrary string to be used as the host model. Userspace tools will then be broken unless the user explicitly edits the domain XML with the desired host model to be exposed to the guest. However, having an arbitrary string in the domain XML that needs to be the same for every guest in that machine but different across host machines would generate issues with XML portability and more importantly, migration. So this series implements a generic way for an administrator to enable the old behavior for a specific guest without allowing arbitrary strings. Implementation note: The 'host-serial' property, which reads /proc/device-tree/system-id in the host and was also addressed by the QEMU change could be implemented similarly in the future. However I see that we're currently populating smbios structures (virSysinfoDef) with info gathered from /proc/cpuinfo for architectures that do not use smbios and I think that should be addressed first. My idea is to perhaps create new sysinfo types like the existing 'smbios', such as 'cpuinfo' and 'device-tree'. So to keep the two discussions separated I took advantage of the fact that the host model happens to also be present at /proc/cpuinfo and used the smbios structures for now. Fabiano Rosas (2): qemu: Add capability for pseries machine 'host-model' parameter qemu: Add support for pseries 'host-model' machine parameter docs/formatdomain.html.in | 9 ++++++ docs/schemas/domaincommon.rng | 5 ++++ src/conf/domain_conf.c | 4 +++ src/conf/domain_conf.h | 1 + src/qemu/qemu_capabilities.c | 2 ++ src/qemu/qemu_capabilities.h | 1 + src/qemu/qemu_command.c | 25 ++++++++++++++-- src/qemu/qemu_domain.c | 1 + .../qemucapabilitiesdata/caps_4.0.0.ppc64.xml | 1 + tests/qemuxml2argvdata/pseries-features.args | 3 +- tests/qemuxml2argvdata/pseries-features.xml | 1 + tests/qemuxml2argvtest.c | 30 ++++++++++++++++++- tests/qemuxml2xmloutdata/pseries-features.xml | 1 + 13 files changed, 79 insertions(+), 5 deletions(-) -- 2.20.1