[pve-devel] [PATCH v3 qemu-server] Simplify QEMU version check and require 3.0+

[Stefan Reiter]

Some of the recent QMP changes require at least 2.8.0, but since the
oldest version we officially package for 6.x is 4.0.0 anyway, checking
for at least 3.0 should not break anyone's setup.

Note that this does not affect machine version checks, only the
installed QEMU binary version.

Signed-off-by: Stefan Reiter <s.reiter at proxmox.com>
---

v2 -> v3:
* include test case and fix existing simple1 test

v1 -> v2:
* handle error in kvm_user_version
* corrected commit message (2.12 -> 2.8)

 PVE/QemuServer.pm          | 14 +++++---------
 test/cfg2cmd/old-qemu.conf |  4 ++++
 test/cfg2cmd/simple1.conf  |  2 +-
 3 files changed, 10 insertions(+), 10 deletions(-)
 create mode 100644 test/cfg2cmd/old-qemu.conf

diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 27b9866..23176dd 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -3415,7 +3415,6 @@ sub config_to_command {
     my $devices = [];
     my $pciaddr = '';
     my $bridges = {};
-    my $vernum = 0; # unknown
     my $ostype = $conf->{ostype};
     my $winversion = windows_version($ostype);
     my $kvm = $conf->{kvm};
@@ -3425,6 +3424,11 @@ sub config_to_command {
     my $kvm_binary = get_command_for_arch($arch);
     my $kvmver = kvm_user_version($kvm_binary);
 
+    if (!$kvmver || $kvmver !~ m/^(\d+)\.(\d+)/ || $1 < 3) {
+	$kvmver //= "undefined";
+	die "Detected old QEMU binary ('$kvmver', at least 3.0 is required)\n";
+    }
+
     my $add_pve_version = min_version($kvmver, 4, 1);
 
     my $machine_type = get_vm_machine($conf, $forcemachine, $arch, $add_pve_version);
@@ -3458,14 +3462,6 @@ sub config_to_command {
 	    if !defined kvm_version();
     }
 
-    if ($kvmver =~ m/^(\d+)\.(\d+)$/) {
-	$vernum = $1*1000000+$2*1000;
-    } elsif ($kvmver =~ m/^(\d+)\.(\d+)\.(\d+)$/) {
-	$vernum = $1*1000000+$2*1000+$3;
-    }
-
-    die "detected old qemu-kvm binary ($kvmver)\n" if $vernum < 15000;
-
     my $q35 = PVE::QemuServer::Machine::machine_type_is_q35($conf);
     my $hotplug_features = parse_hotplug_features(defined($conf->{hotplug}) ? $conf->{hotplug} : '1');
     my $use_old_bios_files = undef;
diff --git a/test/cfg2cmd/old-qemu.conf b/test/cfg2cmd/old-qemu.conf
new file mode 100644
index 0000000..4594844
--- /dev/null
+++ b/test/cfg2cmd/old-qemu.conf
@@ -0,0 +1,4 @@
+# TEST: Simple test for a basic configuration with no special things
+# QEMU_VERSION: 2.12.1
+# EXPECT_ERROR: Detected old QEMU binary ('2.12.1', at least 3.0 is required)
+smbios1: uuid=7b10d7af-b932-4c66-b2c3-3996152ec465
diff --git a/test/cfg2cmd/simple1.conf b/test/cfg2cmd/simple1.conf
index 10a4c31..16a2402 100644
--- a/test/cfg2cmd/simple1.conf
+++ b/test/cfg2cmd/simple1.conf
@@ -1,5 +1,5 @@
 # TEST: Simple test for a basic configuration with no special things
-# QEMU_VERSION: 2.12.1
+# QEMU_VERSION: 3.0
 bootdisk: scsi0
 cores: 3
 ide2: none,media=cdrom
-- 
2.20.1