[PATCH v4 07/10] IOMMU: propagate IOMMU Device-TLB flush error up to iommu_iotlb_flush{, _all} (leaf ones).

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

Propagate the IOMMU Device-TLB flush error up to the iommu_iotlb_flush{,_all}.

This patch fixes the leaf ones.

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

CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Julien Grall <julien.grall@arm.com>
CC: Jan Beulich <jbeulich@suse.com>
CC: Kevin Tian <kevin.tian@intel.com>
CC: Feng Wu <feng.wu@intel.com>
---
 xen/drivers/passthrough/arm/smmu.c  | 12 +++++++-----
 xen/drivers/passthrough/iommu.c     |  8 ++------
 xen/drivers/passthrough/vtd/iommu.c | 10 +++++-----
 xen/include/xen/iommu.h             |  4 ++--
 4 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/arm/smmu.c
index 54a03a6..1864b6d 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -2540,7 +2540,7 @@ static int force_stage = 2;
  */
 static u32 platform_features = ARM_SMMU_FEAT_COHERENT_WALK;
 
-static void arm_smmu_iotlb_flush_all(struct domain *d)
+static int arm_smmu_iotlb_flush_all(struct domain *d)
 {
 	struct arm_smmu_xen_domain *smmu_domain = dom_iommu(d)->arch.priv;
 	struct iommu_domain *cfg;
@@ -2557,13 +2557,15 @@ static void arm_smmu_iotlb_flush_all(struct domain *d)
 		arm_smmu_tlb_inv_context(cfg->priv);
 	}
 	spin_unlock(&smmu_domain->lock);
+
+	return 0;
 }
 
-static void arm_smmu_iotlb_flush(struct domain *d, unsigned long gfn,
-                                 unsigned int page_count)
+static int arm_smmu_iotlb_flush(struct domain *d, unsigned long gfn,
+                                unsigned int page_count)
 {
-    /* ARM SMMU v1 doesn't have flush by VMA and VMID */
-    arm_smmu_iotlb_flush_all(d);
+	/* ARM SMMU v1 doesn't have flush by VMA and VMID */
+	return arm_smmu_iotlb_flush_all(d);
 }
 
 static struct iommu_domain *arm_smmu_get_domain(struct domain *d,
diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index 7b5fc59..c013d91 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -320,9 +320,7 @@ int __must_check iommu_iotlb_flush(struct domain *d, unsigned long gfn,
     if ( !iommu_enabled || !hd->platform_ops || !hd->platform_ops->iotlb_flush )
         return 0;
 
-    hd->platform_ops->iotlb_flush(d, gfn, page_count);
-
-    return 0;
+    return hd->platform_ops->iotlb_flush(d, gfn, page_count);
 }
 
 int __must_check iommu_iotlb_flush_all(struct domain *d)
@@ -332,9 +330,7 @@ int __must_check iommu_iotlb_flush_all(struct domain *d)
     if ( !iommu_enabled || !hd->platform_ops || !hd->platform_ops->iotlb_flush_all )
         return 0;
 
-    hd->platform_ops->iotlb_flush_all(d);
-
-    return 0;
+    return hd->platform_ops->iotlb_flush_all(d);
 }
 
 int __init iommu_setup(void)
diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c
index 584982a..a749c67 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -604,15 +604,15 @@ static int iommu_flush_iotlb(struct domain *d, unsigned long gfn,
     return rc;
 }
 
-static void iommu_flush_iotlb_page(struct domain *d, unsigned long gfn,
-                                   unsigned int page_count)
+static int iommu_flush_iotlb_page(struct domain *d, unsigned long gfn,
+                                  unsigned int page_count)
 {
-    iommu_flush_iotlb(d, gfn, 1, page_count);
+    return iommu_flush_iotlb(d, gfn, 1, page_count);
 }
 
-static void iommu_flush_iotlb_all(struct domain *d)
+static int iommu_flush_iotlb_all(struct domain *d)
 {
-    iommu_flush_iotlb(d, INVALID_GFN, 0, 0);
+    return iommu_flush_iotlb(d, INVALID_GFN, 0, 0);
 }
 
 /* clear one page's page table */
diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index 75c17a7..6a64014 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -179,8 +179,8 @@ struct iommu_ops {
     void (*resume)(void);
     void (*share_p2m)(struct domain *d);
     void (*crash_shutdown)(void);
-    void (*iotlb_flush)(struct domain *d, unsigned long gfn, unsigned int page_count);
-    void (*iotlb_flush_all)(struct domain *d);
+    int (*iotlb_flush)(struct domain *d, unsigned long gfn, unsigned int page_count);
+    int (*iotlb_flush_all)(struct domain *d);
     int (*get_reserved_device_memory)(iommu_grdm_t *, void *);
     void (*dump_p2m_table)(struct domain *d);
 };
-- 
1.9.1


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