From 18352c36ec2a2eba8ffd161a7ca30c2cd7f8ba12 Mon Sep 17 00:00:00 2001
From: Jakob Naucke <jakob.naucke@ibm.com>
Date: Wed, 23 Jun 2021 17:14:20 +0200
Subject: [PATCH] qemu: Fix iommu_platform for vhost user CCW

Enable iommu_platform for vhost user devices

Fixes: #178
Signed-off-by: Jakob Naucke <jakob.naucke@ibm.com>
---
 qemu/qemu.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/qemu/qemu.go b/qemu/qemu.go
index c4aada81e..7d60bb7e1 100644
--- a/qemu/qemu.go
+++ b/qemu/qemu.go
@@ -1435,6 +1435,9 @@ func (vhostuserDev VhostUserDevice) QemuFSParams(config *Config) []string {
 		deviceParams = append(deviceParams, "versiontable=/dev/shm/fuse_shared_versions")
 	}
 	if vhostuserDev.Transport.isVirtioCCW(config) {
+		if config.Knobs.IOMMUPlatform {
+			deviceParams = append(deviceParams, "iommu_platform=on")
+		}
 		deviceParams = append(deviceParams, fmt.Sprintf("devno=%s", vhostuserDev.DevNo))
 	}
 	if vhostuserDev.Transport.isVirtioPCI(config) && vhostuserDev.ROMFile != "" {