From a96da9d4bc8e82f25a673439d5320ec0638c94ce Mon Sep 17 00:00:00 2001
From: Rob Bradford <rbradford@meta.com>
Date: Fri, 3 Apr 2026 11:16:24 -0700
Subject: [PATCH] vmm: Introduce PciDeviceCommonConfig::validate()

Implement some common PCI segment validation. This can be used to reduce
duplication across the different validation methods.

Signed-off-by: Rob Bradford <rbradford@meta.com>
---
 vmm/src/config.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/vmm/src/config.rs b/vmm/src/config.rs
index 2cf80191d..6c399dbdd 100644
--- a/vmm/src/config.rs
+++ b/vmm/src/config.rs
@@ -1226,6 +1226,23 @@ impl PciDeviceCommonConfig {
             pci_segment,
         })
     }
+
+    pub fn validate(&self, vm_config: &VmConfig) -> ValidationResult<()> {
+        if let Some(platform_config) = vm_config.platform.as_ref() {
+            if self.pci_segment >= platform_config.num_pci_segments {
+                return Err(ValidationError::InvalidPciSegment(self.pci_segment));
+            }
+
+            if let Some(iommu_segments) = platform_config.iommu_segments.as_ref()
+                && iommu_segments.contains(&self.pci_segment)
+                && !self.iommu
+            {
+                return Err(ValidationError::OnIommuSegment(self.pci_segment));
+            }
+        }
+
+        Ok(())
+    }
 }
 
 impl DiskConfig {