RE: [PATCH rc 3/8] iommu/vt-d: Add missing iotlb flush for parent domain

From: Liu, Yi L yi.l.liu@intel.com Sent: Thursday, February 8, 2024 4:23 PM

+/*

• • Flush the relevant caches in nested translation if the domain
• • also serves as a parent
• */

+static void parent_domain_flush(struct dmar_domain *domain,

• 		unsigned long pfn,
  

• 		unsigned long pages, int ih)
  

+{

• struct dmar_domain *s1_domain;
• spin_lock(&domain->s1_lock);
• list_for_each_entry(s1_domain, &domain->s1_domains, s2_link) {

• struct iommu_domain_info *info;
  

• unsigned long i;
  

• xa_for_each(&s1_domain->iommu_array, i, info)
  

• 	__iommu_flush_iotlb_psi(info->iommu, info->did,
  

• 				pfn, pages, ih);
  

• }

As Jason suggested before this xarray lacks of proper locking.

but given it's rc fix I'm fine with it. @Baolu we do need fix it soon so this problem won't further expand like here.

Reviewed-by: Kevin Tian kevin.tian@intel.com