This reduce context switch with multicore guests.
Even if the host cpu don't have x2apic, it's working because qemu have an
virtual x2apic implementation for guest.
We need in-kernel irqchip support for this, which is enable for kvm guest
since qemu 1.3.
(I don't enable it if nokvm param is set)
Signed-off-by: Alexandre Derumier <aderum...@odiso.com>
---
PVE/QemuServer.pm | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 31d8103..f0a3c01 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -2225,6 +2225,7 @@ sub config_to_command {
my $globalFlags = [];
my $machineFlags = [];
my $rtcFlags = [];
+ my $cpuFlags = [];
my $devices = [];
my $pciaddr = '';
my $bridges = {};
@@ -2318,11 +2319,8 @@ sub config_to_command {
$sockets = $conf->{sockets} if $conf->{sockets};
my $cores = $conf->{cores} || 1;
-
push @$cmd, '-smp', "sockets=$sockets,cores=$cores";
- push @$cmd, '-cpu', $conf->{cpu} if $conf->{cpu};
-
push @$cmd, '-nodefaults';
my $bootorder = $conf->{boot} || $confdesc->{boot}->{default};
@@ -2395,6 +2393,15 @@ sub config_to_command {
push @$rtcFlags, 'base=localtime';
}
+ my $cpu = $nokvm ? "qemu64" : "kvm64";
+ $cpu = $conf->{cpu} if $conf->{cpu};
+
+ push @$cpuFlags , '+x2apic' if !$nokvm;
+
+ $cpu .= ",".join(',', @$cpuFlags) if scalar(@$cpuFlags);
+
+ push @$cmd, '-cpu', $cpu;
+
push @$cmd, '-S' if $conf->{freeze};
# set keyboard layout
@@ -2423,7 +2430,6 @@ sub config_to_command {
#$x509 .= ",x509-cacert-file=/etc/pve/pve-root-ca.pem";
my $socket = spice_socket($vmid);
-
push @$cmd, '-spice', "unix=$socket";
push @$cmd, '-device', "virtio-serial,id=spice$pciaddr";
push @$cmd, '-chardev', "spicevmc,id=vdagent,name=vdagent";
--
1.7.10.4
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