[Xen-devel] [Patch RFC 06/13] vt-d: Introduce a new per-domain flag - qi_flag.

[Quan Xu <quan.xu@xxxxxxxxx>]

The qi_flag is Set when submit Device-TLB invalidation requests. The
qi_flag will be Clear in QI interrupt handler if there are no in-flight
Device-TLB invalidation requests.

Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/iommu.c  | 1 +
 xen/drivers/passthrough/vtd/qinval.c | 1 +
 xen/include/xen/hvm/iommu.h          | 3 +++
 3 files changed, 5 insertions(+)

diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index e3acea5..fda9a84 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1144,6 +1144,7 @@ scan_again:
             {
                 qi_table_data(d) = 0;
                 qi_table_pollslot(d) = 0;
+                QI_FLUSHING(d) = 0;
             }
             rcu_unlock_domain(d);
         }
diff --git a/xen/drivers/passthrough/vtd/qinval.c 
b/xen/drivers/passthrough/vtd/qinval.c
index abe6e9c..0d85ce7 100644
--- a/xen/drivers/passthrough/vtd/qinval.c
+++ b/xen/drivers/passthrough/vtd/qinval.c
@@ -165,6 +165,7 @@ static int queue_invalidate_wait(struct iommu *iommu,
         qinval_entry->q.inv_wait_dsc.lo.sdata = ++ qi_table_data(d);
         qinval_entry->q.inv_wait_dsc.hi.saddr = virt_to_maddr(
                                                 &qi_table_pollslot(d)) >> 2;
+        QI_FLUSHING(d) = 1;
         rcu_unlock_domain(d);
     } else {
         qinval_entry->q.inv_wait_dsc.lo.sdata = QINVAL_STAT_DONE;
diff --git a/xen/include/xen/hvm/iommu.h b/xen/include/xen/hvm/iommu.h
index 28e7fc3..e838905 100644
--- a/xen/include/xen/hvm/iommu.h
+++ b/xen/include/xen/hvm/iommu.h
@@ -51,6 +51,7 @@ struct hvm_iommu {
 
     /* IOMMU Queued Invalidation(QI) */
     struct qi_talbe talbe;
+    bool_t qi_flag;
 
     /* Features supported by the IOMMU */
     DECLARE_BITMAP(features, IOMMU_FEAT_count);
@@ -63,5 +64,7 @@ struct hvm_iommu {
     (d->arch.hvm_domain.hvm_iommu.talbe.qi_table_status_data)
 #define qi_table_pollslot(d) \
     (d->arch.hvm_domain.hvm_iommu.talbe.qi_table_poll_slot)
+#define QI_FLUSHING(d) \
+    (d->arch.hvm_domain.hvm_iommu.qi_flag)
 
 #endif /* __XEN_HVM_IOMMU_H__ */
-- 
1.8.3.2


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