[PATCH qemu-server v2 2/2] 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 | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/PVE/QemuServer.pm b/src/PVE/QemuServer.pm
index cdf66e89..3ecd16a7 100644
--- a/src/PVE/QemuServer.pm
+++ b/src/PVE/QemuServer.pm
@@ -5853,7 +5853,8 @@ 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 $pkg_version = get_qemu_package_version($vmid);
+    syslog("info", "VM $vmid started with PID $pid using $pkg_version.");
 
     PVE::QemuServer::RunState::create_cleanup_flag($vmid);
 
@@ -8068,6 +8069,12 @@ sub get_running_qemu_version {
     return "$res->{qemu}->{major}.$res->{qemu}->{minor}";
 }
 
+sub get_qemu_package_version {
+    my ($vmid) = @_;
+    my $res = mon_cmd($vmid, "query-version");
+    return $res->{package};
+}
+
 sub qemu_use_old_bios_files {
     my ($machine_type) = @_;
 
-- 
2.47.3