[PATCH v4 04/10] vt-d: propagate IOMMU Device-TLB flush error up to IOMMU unmapping.

[Quan Xu <quan.xu@intel.com>]

Propagate the IOMMU Device-TLB flush error up to IOMMU unmapping.

Signed-off-by: Quan Xu <quan.xu@intel.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>

CC: Kevin Tian <kevin.tian@intel.com>
CC: Feng Wu <feng.wu@intel.com>
CC: Jan Beulich <jbeulich@suse.com>
---
 xen/drivers/passthrough/vtd/iommu.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c
index 64093a9..e0e1126 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -616,11 +616,12 @@ static void iommu_flush_iotlb_all(struct domain *d)
 }
 
 /* clear one page's page table */
-static void dma_pte_clear_one(struct domain *domain, u64 addr)
+static int __must_check dma_pte_clear_one(struct domain *domain, u64 addr)
 {
     struct domain_iommu *hd = dom_iommu(domain);
     struct dma_pte *page = NULL, *pte = NULL;
     u64 pg_maddr;
+    int rc = 0;
 
     spin_lock(&hd->arch.mapping_lock);
     /* get last level pte */
@@ -628,7 +629,7 @@ static void dma_pte_clear_one(struct domain *domain, u64 addr)
     if ( pg_maddr == 0 )
     {
         spin_unlock(&hd->arch.mapping_lock);
-        return;
+        return 0;
     }
 
     page = (struct dma_pte *)map_vtd_domain_page(pg_maddr);
@@ -638,7 +639,7 @@ static void dma_pte_clear_one(struct domain *domain, u64 addr)
     {
         spin_unlock(&hd->arch.mapping_lock);
         unmap_vtd_domain_page(page);
-        return;
+        return 0;
     }
 
     dma_clear_pte(*pte);
@@ -646,9 +647,11 @@ static void dma_pte_clear_one(struct domain *domain, u64 addr)
     iommu_flush_cache_entry(pte, sizeof(struct dma_pte));
 
     if ( !this_cpu(iommu_dont_flush_iotlb) )
-        iommu_flush_iotlb(domain, addr >> PAGE_SHIFT_4K, 1, 1);
+        rc = iommu_flush_iotlb(domain, addr >> PAGE_SHIFT_4K, 1, 1);
 
     unmap_vtd_domain_page(page);
+
+    return rc;
 }
 
 static void iommu_free_pagetable(u64 pt_maddr, int level)
@@ -1766,9 +1769,7 @@ static int intel_iommu_unmap_page(struct domain *d, unsigned long gfn)
     if ( iommu_passthrough && is_hardware_domain(d) )
         return 0;
 
-    dma_pte_clear_one(d, (paddr_t)gfn << PAGE_SHIFT_4K);
-
-    return 0;
+    return dma_pte_clear_one(d, (paddr_t)gfn << PAGE_SHIFT_4K);
 }
 
 int iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,
-- 
1.9.1


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