IOMMU: propagate IOMMU Device-TLB flush error up to IOMMU unmapping (top level ones)

Signed-off-by: Quan Xu <quan.xu@intel.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Acked-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/arm/smmu.c
index 54a03a67c056f4eec0175d925f36105e309b404d..1ce4ddfaac10dfd685f1b4f648ba7de499a98265 100644 (file)
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -2774,7 +2774,7 @@ static int arm_smmu_map_page(struct domain *d, unsigned long gfn,
        return guest_physmap_add_entry(d, gfn, mfn, 0, t);
 }
 
-static int arm_smmu_unmap_page(struct domain *d, unsigned long gfn)
+static int __must_check arm_smmu_unmap_page(struct domain *d, unsigned long gfn)
 {
        /*
         * This function should only be used by gnttab code when the domain

diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c
index db839498ee112ecf6bd2b31f47c92823041bbc02..4844193031a527ca842fa9ab45b969704c9d9f8a 100644 (file)
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -609,7 +609,7 @@ static void intel_iommu_iotlb_flush_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;
@@ -621,7 +621,7 @@ 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);
@@ -631,7 +631,7 @@ 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);
@@ -642,6 +642,8 @@ static void dma_pte_clear_one(struct domain *domain, u64 addr)
         __intel_iommu_iotlb_flush(domain, addr >> PAGE_SHIFT_4K, 1, 1);
 
     unmap_vtd_domain_page(page);
+
+    return 0;
 }
 
 static void iommu_free_pagetable(u64 pt_maddr, int level)
@@ -1739,15 +1741,14 @@ static int intel_iommu_map_page(
     return 0;
 }
 
-static int intel_iommu_unmap_page(struct domain *d, unsigned long gfn)
+static int __must_check intel_iommu_unmap_page(struct domain *d,
+                                               unsigned long gfn)
 {
     /* Do nothing if hardware domain and iommu supports pass thru. */
     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);
 }
 
 void iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,

diff --git a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
index e6065d326b6c4e2ab309e2df0a0770db9c2bfe4d..c717cf68714e9247820af26c249c0c39f3b6a550 100644 (file)
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
@@ -54,7 +54,7 @@ int amd_iommu_update_ivrs_mapping_acpi(void);
 /* mapping functions */
 int amd_iommu_map_page(struct domain *d, unsigned long gfn, unsigned long mfn,
                        unsigned int flags);
-int amd_iommu_unmap_page(struct domain *d, unsigned long gfn);
+int __must_check amd_iommu_unmap_page(struct domain *d, unsigned long gfn);
 u64 amd_iommu_get_next_table_from_pte(u32 *entry);
 int amd_iommu_reserve_domain_unity_map(struct domain *domain,
                                        u64 phys_addr, unsigned long size,

diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index eaa2c77a8e0d4361e2e01b147bb45254f9823998..f45fa5a7d8f48e13df8ef4adbc6c6dfc1a89bcc0 100644 (file)
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -168,7 +168,7 @@ struct iommu_ops {
     void (*teardown)(struct domain *d);
     int (*map_page)(struct domain *d, unsigned long gfn, unsigned long mfn,
                     unsigned int flags);
-    int (*unmap_page)(struct domain *d, unsigned long gfn);
+    int __must_check (*unmap_page)(struct domain *d, unsigned long gfn);
     void (*free_page_table)(struct page_info *);
 #ifdef CONFIG_X86
     void (*update_ire_from_apic)(unsigned int apic, unsigned int reg, unsigned int value);