[Qemu-devel] [PATCH v2 0/3] qga/Linux: online/offline/query VCPUs via guest sysfs

[Laszlo Ersek]

Until the uncomparably harder task of real VCPU hotplug / hot-unplug is
completed, here's a small guest agent series that imitates the same
thing through the sysfs of the Linux guest. We've heard that people
migrating from another VMM might be transitorily interested in this.

In v2: addressing the reviews of Eric and Michael (many thanks).
- Deal with non-offline-able VCPUs, introducing
  GuestLogicalProcessor.can_offline,
- POSIX write()-style retvals in guest-set-vcpus,
- move implementation into preexistent __linux__ section, keep
  standalone stubs,
- massage sysfs files with <unistd.h> interfaces.

(v2 is practically a rewrite; the interdiff doesn't appear particularly
helpful.)

Laszlo Ersek (3):
  qga: introduce guest-get-vcpus / guest-set-vcpus with stubs
  qga: implement qmp_guest_get_vcpus() for Linux with sysfs
  qga: implement qmp_guest_set_vcpus() for Linux with sysfs

 qga/qapi-schema.json |   72 +++++++++++++++++++++
 qga/commands-posix.c |  172 ++++++++++++++++++++++++++++++++++++++++++++++++++
 qga/commands-win32.c |   12 ++++
 3 files changed, 256 insertions(+), 0 deletions(-)