[Xen-devel] [PATCH v2 06/11] vt-d: propagate IOMMU Device-TLB flush error up to IOMMU mapping.

[Quan Xu <quan.xu@xxxxxxxxx>]

While IOMMU Device-TLB flush timed out, xen calls panic() at present.
However the existing panic() is going to be eliminated, so we must
propagate the IOMMU Device-TLB flush error up to IOMMU mapping.

Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>

CC: Kevin Tian <kevin.tian@xxxxxxxxx>
CC: Feng Wu <feng.wu@xxxxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/drivers/passthrough/vtd/iommu.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index 580a9cf..5cc70ca 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1720,6 +1720,7 @@ static int intel_iommu_map_page(
     struct hvm_iommu *hd = domain_hvm_iommu(d);
     struct dma_pte *page = NULL, *pte = NULL, old, new = { 0 };
     u64 pg_maddr;
+    int rc = 0;
 
     /* Do nothing if VT-d shares EPT page table */
     if ( iommu_use_hap_pt(d) )
@@ -1762,9 +1763,9 @@ static int intel_iommu_map_page(
     unmap_vtd_domain_page(page);
 
     if ( !this_cpu(iommu_dont_flush_iotlb) )
-        iommu_flush_iotlb(d, gfn, dma_pte_present(old), 1);
+        rc = iommu_flush_iotlb(d, gfn, dma_pte_present(old), 1);
 
-    return 0;
+    return rc;
 }
 
 static int intel_iommu_unmap_page(struct domain *d, unsigned long gfn)
-- 
1.9.1


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