Re: [libvirt] [PATCH v2 6/7] qemu: Forbid MSR features with old QEMU

Without "unavailable-features" CPU property we cannot properly detect whether a specific MSR feature we asked for (either explicitly or implicitly via a CPU model) was disabled by QEMU for some reason. Because this could break migration, snapshots, and save/restore operaions, it's better to just forbid any use of MSR features with QEMU which lacks "unavailable-features" CPU property. Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com&gt; --- src/qemu/qemu_process.c | 29 ++++++++++++++++++++++++++--- 1 file changed, 26 insertions(+), 3 deletions(-)