[pve-devel] [PATCH qemu-server] fix #3784: Parameter for guest vIOMMU

[Markus Frank <m.frank@proxmox.com>]

added a Parameter for vIOMMU so nobody has to use a github-script
or change the kvm command on every vm boot.
The args parameter doesn't work because the -device parameter(kvm)
with intel-iommu has to be placed before the other arguments.

Signed-off-by: Markus Frank <m.frank@proxmox.com>
---
 PVE/QemuServer.pm | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 42f0fbd..a09dd2e 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -647,6 +647,12 @@ EODESCR
 	    ." remove disk operations.",
 	default => 0,
     },
+    viommu => {
+	optional => 1,
+	type => 'boolean',
+	description => "enable guest vIOMMU",
+	default => 0,
+    },
     bios => {
 	optional => 1,
 	type => 'string',
@@ -3427,6 +3433,9 @@ sub config_to_command {
     my $winversion = windows_version($ostype);
     my $kvm = $conf->{kvm};
     my $nodename = nodename();
+    my $viommu = $conf->{viommu};
+
+    push @$devices, '-device', 'intel-iommu,intremap=on,caching-mode=on' if $viommu;
 
     my $arch = get_vm_arch($conf);
     my $kvm_binary = get_command_for_arch($arch);
@@ -4021,6 +4030,8 @@ sub config_to_command {
     }
     push @$machineFlags, "type=${machine_type_min}";
 
+    push @$machineFlags, 'accel=kvm,kernel-irqchip=split' if $viommu;
+
     push @$cmd, @$devices;
     push @$cmd, '-rtc', join(',', @$rtcFlags) if scalar(@$rtcFlags);
     push @$cmd, '-machine', join(',', @$machineFlags) if scalar(@$machineFlags);
-- 
2.30.2