[PATCH qemu-server v3 0/3] vm start: log qemu version when starting a VM

[PATCH qemu-server v3 0/3] vm start: log qemu version when starting a VM

[Maximiliano Sandoval]

Differences from v2:
- Move get_qemu_package_version and get_runnning_qemu_version to QMPHelpers.pm

Differences from v1:

- Fix a typo s/pgk/pkg/
- Rename helper to get_qemu_package_version
- Add dummy output in mockup method

Maximiliano Sandoval (3):
  test: mock query-version qmp command
  move get_running_qemu_version to QMPHelpers
  vm start: log qemu version when starting a VM

 src/PVE/QemuServer.pm            | 12 ++++--------
 src/PVE/QemuServer/QMPHelpers.pm | 11 +++++++++++
 src/test/MigrationTest/QmMock.pm | 10 ++++++++++
 3 files changed, 25 insertions(+), 8 deletions(-)

-- 
2.47.3

[PATCH qemu-server v3 1/3] test: mock query-version qmp command

[Maximiliano Sandoval]

In the next commit we add a call to query-version to log the package
version when starting a VM.

Signed-off-by: Maximiliano Sandoval <m.sandoval@proxmox.com>
---
 src/test/MigrationTest/QmMock.pm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/test/MigrationTest/QmMock.pm b/src/test/MigrationTest/QmMock.pm
index 311dbb39..c6fc1f50 100644
--- a/src/test/MigrationTest/QmMock.pm
+++ b/src/test/MigrationTest/QmMock.pm
@@ -54,6 +54,11 @@ my sub mocked_mon_cmd {
         return [];
     } elsif ($command eq 'qom-set') {
         return;
+    } elsif ($command eq 'query-version') {
+        return {
+            qemu => { major => '11', minor => '0', micro => '0' },
+            package => 'pve-qemu-kvm_11.0.0-4',
+        };
     }
     die "mon_cmd (mocked) - implement me: $command";
 }
-- 
2.47.3

[PATCH qemu-server v3 2/3] move get_running_qemu_version to QMPHelpers

[Maximiliano Sandoval]

We will add a new helper for retrieving the package version in the next
commit and it makes sense to keep them together.

Since the fn is in a different module now one also needs to add it to
the mock modules. This will be relevant in the next commit when
query-version is called as part of VM startup.

Signed-off-by: Maximiliano Sandoval <m.sandoval@proxmox.com>
---
 src/PVE/QemuServer.pm            | 9 ++-------
 src/PVE/QemuServer/QMPHelpers.pm | 6 ++++++
 src/test/MigrationTest/QmMock.pm | 5 +++++
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/src/PVE/QemuServer.pm b/src/PVE/QemuServer.pm
index cdf66e89..12ac5d2d 100644
--- a/src/PVE/QemuServer.pm
+++ b/src/PVE/QemuServer.pm
@@ -89,7 +89,8 @@ use PVE::QemuServer::OVMF;
 use PVE::QemuServer::PCI qw(print_pci_addr print_pcie_addr print_pcie_root_port parse_hostpci);
 use PVE::QemuServer::PCI::Mdev;
 use PVE::QemuServer::QemuImage;
-use PVE::QemuServer::QMPHelpers qw(qemu_deviceadd qemu_devicedel qemu_objectadd qemu_objectdel);
+use PVE::QemuServer::QMPHelpers
+    qw(get_running_qemu_version qemu_deviceadd qemu_devicedel qemu_objectadd qemu_objectdel);
 use PVE::QemuServer::QSD;
 use PVE::QemuServer::RNG qw(parse_rng print_rng_device_commandline print_rng_object_commandline);
 use PVE::QemuServer::RunState;
@@ -8062,12 +8063,6 @@ no_data_clone:
     return $disk;
 }
 
-sub get_running_qemu_version {
-    my ($vmid) = @_;
-    my $res = mon_cmd($vmid, "query-version");
-    return "$res->{qemu}->{major}.$res->{qemu}->{minor}";
-}
-
 sub qemu_use_old_bios_files {
     my ($machine_type) = @_;
 
diff --git a/src/PVE/QemuServer/QMPHelpers.pm b/src/PVE/QemuServer/QMPHelpers.pm
index b4c6d1e7..4275ebb2 100644
--- a/src/PVE/QemuServer/QMPHelpers.pm
+++ b/src/PVE/QemuServer/QMPHelpers.pm
@@ -8,6 +8,7 @@ use PVE::QemuServer::Monitor qw(mon_cmd);
 use base 'Exporter';
 
 our @EXPORT_OK = qw(
+    get_running_qemu_version
     qemu_deviceadd
     qemu_devicedel
     qemu_objectadd
@@ -18,6 +19,11 @@ sub nbd_stop($vmid) {
     mon_cmd($vmid, 'nbd-server-stop', timeout => 25);
 }
 
+sub get_running_qemu_version($vmid) {
+    my $res = mon_cmd($vmid, 'query-version');
+    return "$res->{qemu}->{major}.$res->{qemu}->{minor}";
+}
+
 sub qemu_deviceadd($vmid, $devicefull) {
     $devicefull = "driver=" . $devicefull;
 
diff --git a/src/test/MigrationTest/QmMock.pm b/src/test/MigrationTest/QmMock.pm
index c6fc1f50..8f8899dc 100644
--- a/src/test/MigrationTest/QmMock.pm
+++ b/src/test/MigrationTest/QmMock.pm
@@ -82,6 +82,11 @@ $qemu_server_helpers_module->mock(
     },
 );
 
+my $qemu_server_qmp_helpers_module = Test::MockModule->new("PVE::QemuServer::QMPHelpers");
+$qemu_server_qmp_helpers_module->mock(
+    mon_cmd => \&mocked_mon_cmd,
+);
+
 my $qemu_server_runstate_module = Test::MockModule->new("PVE::QemuServer::RunState");
 $qemu_server_runstate_module->mock(
     get_cleanup_flag_path => sub {
-- 
2.47.3

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

[Maximiliano Sandoval]

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

applied: [PATCH qemu-server v3 0/3] vm start: log qemu version when starting a VM

[Fiona Ebner]

On Tue, 30 Jun 2026 13:04:36 +0200, Maximiliano Sandoval wrote:
> Differences from v2:
> - Move get_qemu_package_version and get_runnning_qemu_version to QMPHelpers.pm
> 
> Differences from v1:
> 
> - Fix a typo s/pgk/pkg/
> - Rename helper to get_qemu_package_version
> - Add dummy output in mockup method
> 
> [...]

Applied, thanks! Changed the variable and function name in 3/3 to
clarify that it's not just the version, but the full package string
and added a comment about how the package string looks like.

[1/3] test: mock query-version qmp command
      commit: 5cd70b317b74ba7406607903e8a4e587b1ee77a1
[2/3] move get_running_qemu_version to QMPHelpers
      commit: 3f7e57d46c2524a718cf9bb6592ea282e0d05a33
[3/3] vm start: log qemu version when starting a VM
      commit: d93e3276b2172a6c4a4ef133b17949e9eae46263