Commit 79d82ce4 authored by Lu Baolu's avatar Lu Baolu Committed by Joerg Roedel
Browse files

iommu/vt-d: Check device list of domain in domain free path 



When the IOMMU domain is about to be freed, it should not be set on any
device. Instead of silently dealing with some bug cases, it's better to
trigger a warning to report and fix any potential bugs at the first time.

Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20220706025524.2904370-9-baolu.lu@linux.intel.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 8430fd3f

drivers/iommu/intel/iommu.c

+3 −15
Original line number Diff line number Diff line
@@ -294,7 +294,6 @@ static LIST_HEAD(dmar_satc_units); 
/* bitmap for indexing intel_iommus */

static int g_num_of_iommus;



static void domain_remove_dev_info(struct dmar_domain *domain);

static void dmar_remove_one_dev_info(struct device *dev);

static void __dmar_remove_one_dev_info(struct device_domain_info *info);
@@ -1841,10 +1840,6 @@ static inline int guestwidth_to_adjustwidth(int gaw) 


static void domain_exit(struct dmar_domain *domain)

{



	/* Remove associated devices and clear attached or cached domains */

	domain_remove_dev_info(domain);



	if (domain->pgd) {

		LIST_HEAD(freelist);
@@ -1852,6 +1847,9 @@ static void domain_exit(struct dmar_domain *domain) 
		put_pages_list(&freelist);

	}



	if (WARN_ON(!list_empty(&domain->devices)))

		return;



	kfree(domain);

}
@@ -2333,16 +2331,6 @@ static void domain_context_clear_one(struct device_domain_info *info, u8 bus, u8 
	__iommu_flush_dev_iotlb(info, 0, MAX_AGAW_PFN_WIDTH);

}



static void domain_remove_dev_info(struct dmar_domain *domain)

{

	struct device_domain_info *info, *tmp;



	spin_lock(&device_domain_lock);

	list_for_each_entry_safe(info, tmp, &domain->devices, link)

		__dmar_remove_one_dev_info(info);

	spin_unlock(&device_domain_lock);

}



static int domain_setup_first_level(struct intel_iommu *iommu,

				    struct dmar_domain *domain,

				    struct device *dev,