[pve-devel] [PATCH qemu-server 4/4] cpu config: Unify the default value for 'kvm'

[Filip Schauer <f.schauer@proxmox.com>]

Make the default value for 'kvm' consistent and take into account
whether the VM will run on the same CPU architecture as the host. This
is a breaking change for VMs with a different CPU architecture running
on an x86_64 host, since in this case the default CPU type for
CPU hotplug switches from 'kvm64' to 'qemu64'.

Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
---
 PVE/QemuServer.pm           | 6 ++++--
 PVE/QemuServer/CPUConfig.pm | 5 +++--
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 1a1080d..b2d71e1 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -3815,7 +3815,7 @@ sub config_to_command {
     if ($hotplug_features->{cpu} && min_version($machine_version, 2, 7)) {
 	push @$cmd, '-smp', "1,sockets=$sockets,cores=$cores,maxcpus=$maxcpus";
         for (my $i = 2; $i <= $vcpus; $i++)  {
-	    my $cpustr = print_cpu_device($conf,$i);
+	    my $cpustr = print_cpu_device($conf, $arch, $i);
 	    push @$cmd, '-device', $cpustr;
 	}
 
@@ -4656,10 +4656,12 @@ sub qemu_cpu_hotplug {
     die "vcpus in running vm does not match its configuration\n"
 	if scalar(@{$currentrunningvcpus}) != $currentvcpus;
 
+    my $arch = get_vm_arch($conf);
+
     if (PVE::QemuServer::Machine::machine_version($machine_type, 2, 7)) {
 
 	for (my $i = $currentvcpus+1; $i <= $vcpus; $i++) {
-	    my $cpustr = print_cpu_device($conf, $i);
+	    my $cpustr = print_cpu_device($conf, $arch, $i);
 	    qemu_deviceadd($vmid, $cpustr);
 
 	    my $retry = 0;
diff --git a/PVE/QemuServer/CPUConfig.pm b/PVE/QemuServer/CPUConfig.pm
index abf3198..38d80ca 100644
--- a/PVE/QemuServer/CPUConfig.pm
+++ b/PVE/QemuServer/CPUConfig.pm
@@ -5,6 +5,7 @@ use warnings;
 
 use PVE::JSONSchema;
 use PVE::Cluster qw(cfs_register_file cfs_read_file);
+use PVE::Tools qw(is_native);
 use PVE::QemuServer::Helpers qw(get_default_cpu_type min_version);
 
 use base qw(PVE::SectionConfig Exporter);
@@ -414,9 +415,9 @@ sub get_custom_model {
 
 # Print a QEMU device node for a given VM configuration for hotplugging CPUs
 sub print_cpu_device {
-    my ($conf, $id) = @_;
+    my ($conf, $arch, $id) = @_;
 
-    my $kvm = $conf->{kvm} // 1;
+    my $kvm = $conf->{kvm} // is_native($arch);
     my $cpu = get_default_cpu_type('x86_64', $kvm);
     if (my $cputype = $conf->{cpu}) {
 	my $cpuconf = PVE::JSONSchema::parse_property_string('pve-vm-cpu-conf', $cputype)
-- 
2.39.2