From 174fc8f44b93f25402b06b7eaba66f994ade7b39 Mon Sep 17 00:00:00 2001
From: Pavel Mores <pmores@redhat.com>
Date: Wed, 24 Apr 2024 17:57:43 +0200
Subject: [PATCH] runtime-rs: support iommu_platform for qemu virtio-net device

Note that it's only supported on CCW systems.

Signed-off-by: Pavel Mores <pmores@redhat.com>
---
 .../crates/hypervisor/src/qemu/cmdline_generator.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/runtime-rs/crates/hypervisor/src/qemu/cmdline_generator.rs b/src/runtime-rs/crates/hypervisor/src/qemu/cmdline_generator.rs
index 3ab04e106..720f13829 100644
--- a/src/runtime-rs/crates/hypervisor/src/qemu/cmdline_generator.rs
+++ b/src/runtime-rs/crates/hypervisor/src/qemu/cmdline_generator.rs
@@ -997,6 +997,7 @@ pub struct DeviceVirtioNet {
     disable_modern: bool,
 
     num_queues: u32,
+    iommu_platform: bool,
 }
 
 impl DeviceVirtioNet {
@@ -1007,6 +1008,7 @@ impl DeviceVirtioNet {
             mac_address,
             disable_modern: false,
             num_queues: 1,
+            iommu_platform: false,
         }
     }
 
@@ -1019,6 +1021,11 @@ impl DeviceVirtioNet {
         self.num_queues = num_queues;
         self
     }
+
+    fn set_iommu_platform(&mut self, iommu_platform: bool) -> &mut Self {
+        self.iommu_platform = iommu_platform;
+        self
+    }
 }
 
 #[async_trait]
@@ -1035,6 +1042,9 @@ impl ToQemuParams for DeviceVirtioNet {
         if self.disable_modern {
             params.push("disable-modern=true".to_owned());
         }
+        if self.iommu_platform {
+            params.push("iommu_platform=on".to_owned());
+        }
 
         params.push("mq=on".to_owned());
         params.push(format!("vectors={}", 2 * self.num_queues + 2));
@@ -1378,6 +1388,9 @@ impl<'a> QemuCmdLine<'a> {
         if should_disable_modern() {
             virtio_net_device.set_disable_modern(true);
         }
+        if self.config.device_info.enable_iommu_platform && self.bus_type() == VirtioBusType::Ccw {
+            virtio_net_device.set_iommu_platform(true);
+        }
         if self.config.network_info.network_queues > 1 {
             virtio_net_device.set_num_queues(self.config.network_info.network_queues);
         }