[PATCH qemu-server v3 3/3] vm start: log qemu version when starting a VM

[Maximiliano Sandoval <m.sandoval@proxmox.com>]

Previously, having the system journal and task logs from a boot was not
enough to determine which qemu version is installed nor the running QEMU
version of a VM. This is addressed by logging pve-qemu-kvm's package
version when starting the VM.

The package version is obtained with the 'query-version' qmp command.

Signed-off-by: Maximiliano Sandoval <m.sandoval@proxmox.com>
---

Notes:
    sample output in the journal:
    
    Jun 24 10:39:14 pve-148 qm[26137]: VM 100 started with PID 26166 using pve-qemu-kvm_11.0.0-4.

 src/PVE/QemuServer.pm            | 3 ++-
 src/PVE/QemuServer/QMPHelpers.pm | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/PVE/QemuServer.pm b/src/PVE/QemuServer.pm
index 12ac5d2d..8d88e456 100644
--- a/src/PVE/QemuServer.pm
+++ b/src/PVE/QemuServer.pm
@@ -5854,7 +5854,8 @@ sub vm_start_nolock {
     eval { PVE::QemuServer::PCI::reserve_pci_usage($pci_reserve_list, $vmid, undef, $pid) };
     warn $@ if $@;
 
-    syslog("info", "VM $vmid started with PID $pid.");
+    my $pkg_version = PVE::QemuServer::QMPHelpers::get_qemu_package_version($vmid);
+    syslog("info", "VM $vmid started with PID $pid using $pkg_version.");
 
     PVE::QemuServer::RunState::create_cleanup_flag($vmid);
 
diff --git a/src/PVE/QemuServer/QMPHelpers.pm b/src/PVE/QemuServer/QMPHelpers.pm
index 4275ebb2..6f956080 100644
--- a/src/PVE/QemuServer/QMPHelpers.pm
+++ b/src/PVE/QemuServer/QMPHelpers.pm
@@ -19,6 +19,11 @@ sub nbd_stop($vmid) {
     mon_cmd($vmid, 'nbd-server-stop', timeout => 25);
 }
 
+sub get_qemu_package_version($vmid) {
+    my $res = mon_cmd($vmid, 'query-version');
+    return $res->{package};
+}
+
 sub get_running_qemu_version($vmid) {
     my $res = mon_cmd($vmid, 'query-version');
     return "$res->{qemu}->{major}.$res->{qemu}->{minor}";
-- 
2.47.3