[Qemu-devel] [PATCH v4 01/16] acpi: enable INTR for DMAR report structure

[Peter Xu <peterx@redhat.com>]

Introduce iommu_intr in MachineState to show whether IOMMU IR is
enabled. By default, IR is off.

In ACPI DMA remapping report structure, enable INTR flag when specified.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 hw/core/machine.c             |  2 ++
 hw/i386/acpi-build.c          | 12 +++++++++---
 include/hw/boards.h           |  1 +
 include/hw/i386/intel_iommu.h |  2 ++
 4 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/hw/core/machine.c b/hw/core/machine.c
index 6dbbc85..276ad61 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -382,6 +382,8 @@ static void machine_initfn(Object *obj)
     ms->kvm_shadow_mem = -1;
     ms->dump_guest_core = true;
     ms->mem_merge = true;
+    /* Disable interrupt remapping by default. */
+    ms->iommu_intr = false;
 
     object_property_add_str(obj, "accel",
                             machine_get_accel, machine_set_accel, NULL);
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 6477003..80dd1bb 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2575,16 +2575,22 @@ build_mcfg_q35(GArray *table_data, GArray *linker, AcpiMcfgInfo *info)
 }
 
 static void
-build_dmar_q35(GArray *table_data, GArray *linker)
+build_dmar_q35(MachineState *ms, GArray *table_data, GArray *linker)
 {
     int dmar_start = table_data->len;
 
     AcpiTableDmar *dmar;
     AcpiDmarHardwareUnit *drhd;
+    uint8_t dmar_flags = 0;
+
+    if (ms->iommu_intr) {
+        /* enable INTR for the IOMMU device */
+        dmar_flags |= DMAR_REPORT_F_INTR;
+    }
 
     dmar = acpi_data_push(table_data, sizeof(*dmar));
     dmar->host_address_width = VTD_HOST_ADDRESS_WIDTH - 1;
-    dmar->flags = 0;    /* No intr_remap for now */
+    dmar->flags = dmar_flags;
 
     /* DMAR Remapping Hardware Unit Definition structure */
     drhd = acpi_data_push(table_data, sizeof(*drhd));
@@ -2745,7 +2751,7 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
     }
     if (acpi_has_iommu()) {
         acpi_add_table(table_offsets, tables_blob);
-        build_dmar_q35(tables_blob, tables->linker);
+        build_dmar_q35(MACHINE(pcms), tables_blob, tables->linker);
     }
     if (pcms->acpi_nvdimm_state.is_enabled) {
         nvdimm_build_acpi(table_offsets, tables_blob, tables->linker);
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 8d4fe56..43f4976 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -152,6 +152,7 @@ struct MachineState {
     bool igd_gfx_passthru;
     char *firmware;
     bool iommu;
+    bool iommu_intr;
     bool suppress_vmdesc;
     bool enforce_config_section;
 
diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
index b024ffa..0d89796 100644
--- a/include/hw/i386/intel_iommu.h
+++ b/include/hw/i386/intel_iommu.h
@@ -44,6 +44,8 @@
 #define VTD_HOST_ADDRESS_WIDTH      39
 #define VTD_HAW_MASK                ((1ULL << VTD_HOST_ADDRESS_WIDTH) - 1)
 
+#define DMAR_REPORT_F_INTR          (1)
+
 typedef struct VTDContextEntry VTDContextEntry;
 typedef struct VTDContextCacheEntry VTDContextCacheEntry;
 typedef struct IntelIOMMUState IntelIOMMUState;
-- 
2.4.3