[Qemu-devel] [PATCH v5 16/18] intel_iommu: do replay when context invalidate

[Peter Xu <peterx@redhat.com>]

Before this one we only invalidate context cache when we receive context
entry invalidations. However it's possible that the invalidation also
contains a domain switch (only if cache-mode is enabled for vIOMMU). In
that case we need to notify all the registered components about the new
mapping.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 hw/i386/intel_iommu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index a79250b..9d9a38d 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1115,6 +1115,16 @@ static void vtd_context_device_invalidate(IntelIOMMUState *s,
                 trace_vtd_inv_desc_cc_device(bus_n, VTD_PCI_SLOT(devfn_it),
                                              VTD_PCI_FUNC(devfn_it));
                 vtd_as->context_cache_entry.context_cache_gen = 0;
+                /*
+                 * So a device is moving out of (or moving into) a
+                 * domain, a replay() suites here to notify all the
+                 * IOMMU_NOTIFIER_MAP registers about this change.
+                 * This won't bring bad even if we have no such
+                 * notifier registered - the IOMMU notification
+                 * framework will skip MAP notifications if that
+                 * happened.
+                 */
+                memory_region_iommu_replay_all(&vtd_as->iommu);
             }
         }
     }
-- 
2.7.4