[Xen-devel] [PATCH v3 08/10] vt-d/ept: propagate IOMMU Device-TLB flush error up to EPT update.

[Quan Xu <quan.xu@xxxxxxxxx>]

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@xxxxxxxxx>

CC: Jun Nakajima <jun.nakajima@xxxxxxxxx>
CC: Kevin Tian <kevin.tian@xxxxxxxxx>
CC: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Feng Wu <feng.wu@xxxxxxxxx>
---
 xen/arch/x86/mm/p2m-ept.c           | 3 ++-
 xen/drivers/passthrough/vtd/iommu.c | 4 ++--
 xen/include/asm-x86/iommu.h         | 3 ++-
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c
index df87944..d31650f 100644
--- a/xen/arch/x86/mm/p2m-ept.c
+++ b/xen/arch/x86/mm/p2m-ept.c
@@ -828,7 +828,8 @@ out:
          need_modify_vtd_table )
     {
         if ( iommu_hap_pt_share )
-            iommu_pte_flush(d, gfn, &ept_entry->epte, order, vtd_pte_present);
+            ret = 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 e2cb1e1..bf8c9c1 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1779,8 +1779,8 @@ static int intel_iommu_unmap_page(struct domain *d, 
unsigned long gfn)
     return dma_pte_clear_one(d, (paddr_t)gfn << PAGE_SHIFT_4K);
 }
 
-int iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,
-                    int order, bool_t present)
+int __must_check iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,
+                                 int order, bool_t present)
 {
     struct acpi_drhd_unit *drhd;
     struct iommu *iommu = NULL;
diff --git a/xen/include/asm-x86/iommu.h b/xen/include/asm-x86/iommu.h
index 1ae0c5a..fbfb1a4 100644
--- a/xen/include/asm-x86/iommu.h
+++ b/xen/include/asm-x86/iommu.h
@@ -26,7 +26,8 @@ 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);
-int iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte, int order, bool_t 
present);
+int __must_check iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,
+                                 int order, bool_t present);
 bool_t iommu_supports_eim(void);
 int iommu_enable_x2apic_IR(void);
 void iommu_disable_x2apic_IR(void);
-- 
1.9.1


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