From: Quan Xu <quan.xu@intel.com>
Date: Fri, 17 Jun 2016 08:25:52 +0000 (+0200)
Subject: propagate IOMMU Device-TLB flush error up to EPT update (top level ones)
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~938
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=855ed9fc5fb4b42c169f6e1c55488e59175652dd;p=xen.git

propagate IOMMU Device-TLB flush error up to EPT update (top level ones)

Propagate the IOMMU Device-TLB flush error up to the ept_set_entry(),
when VT-d shares EPT page table.

Signed-off-by: Quan Xu <quan.xu@intel.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: George Dunlap <george.dunlap@citrix.com>
---

diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c
index b4505f3578..7166c7144b 100644
--- a/xen/arch/x86/mm/p2m-ept.c
+++ b/xen/arch/x86/mm/p2m-ept.c
@@ -832,7 +832,7 @@ out:
          need_modify_vtd_table )
     {
         if ( iommu_hap_pt_share )
-            iommu_pte_flush(d, gfn, &ept_entry->epte, order, vtd_pte_present);
+            rc = iommu_pte_flush(d, gfn, &ept_entry->epte, order, vtd_pte_present);
         else
         {
             if ( iommu_flags )
diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c
index e90001900c..5366267f60 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1752,8 +1752,8 @@ static int __must_check intel_iommu_unmap_page(struct domain *d,
     return dma_pte_clear_one(d, (paddr_t)gfn << PAGE_SHIFT_4K);
 }
 
-void iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,
-                     int order, int present)
+int iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,
+                    int order, int present)
 {
     struct acpi_drhd_unit *drhd;
     struct iommu *iommu = NULL;
@@ -1778,6 +1778,8 @@ void iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,
                                    order, !present, flush_dev_iotlb) )
             iommu_flush_write_buffer(iommu);
     }
+
+    return 0;
 }
 
 static int __init vtd_ept_page_compatible(struct iommu *iommu)
diff --git a/xen/include/asm-x86/iommu.h b/xen/include/asm-x86/iommu.h
index 23f3f5cf86..be951068d8 100644
--- a/xen/include/asm-x86/iommu.h
+++ b/xen/include/asm-x86/iommu.h
@@ -86,7 +86,8 @@ int iommu_setup_hpet_msi(struct msi_desc *);
 
 /* While VT-d specific, this must get declared in a generic header. */
 int adjust_vtd_irq_affinities(void);
-void iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte, int order, int present);
+int __must_check iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,
+                                 int order, int present);
 bool_t iommu_supports_eim(void);
 int iommu_enable_x2apic_IR(void);
 void iommu_disable_x2apic_IR(void);