From c851f32b02ba2c50cc5580efdb167ad670e30747 Mon Sep 17 00:00:00 2001
From: agicy <agicy@qq.com>
Date: Fri, 14 Nov 2025 21:24:11 +0800
Subject: [PATCH] fix(arch/aarch64/iommu): make IOMMU initialization
 conditional on a feature flag

This commit resolves the issue #212 by wrapping the SMMUv3 initialization
logic in a `#[cfg(feature = "iommu")]` attribute. A corresponding
empty `iommu_init` function is provided under `#[cfg(not(feature = "iommu"))]`.

This change allows the hypervisor to be compiled without IOMMU support,
enabling it to boot successfully on affected hardware by disabling the
default feature.

Fixes: #212
---
 src/arch/aarch64/iommu.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/arch/aarch64/iommu.rs b/src/arch/aarch64/iommu.rs
index 1b7110d5..a33d3f17 100644
--- a/src/arch/aarch64/iommu.rs
+++ b/src/arch/aarch64/iommu.rs
@@ -530,7 +530,14 @@ impl Smmuv3 {
 
 static SMMUV3: spin::Once<Mutex<Smmuv3>> = spin::Once::new();
 
-/// smmuv3 init
+/// iommu feature is disabled.
+#[cfg(not(feature = "iommu"))]
+pub fn iommu_init() {
+    info!("aarch64: iommu_init: do nothing now");
+}
+
+/// smmuv3 init (enabled)
+#[cfg(feature = "iommu")]
 pub fn iommu_init() {
     info!("Smmuv3 init...");
     SMMUV3.call_once(|| Mutex::new(Smmuv3::new()));