Commit 3a3dd64e63 for qemu.org

commit 3a3dd64e63dc772f6067d8215b7add7474e6a3e5
Author: Nathan Chen <nathanc@nvidia.com>
Date:   Tue Mar 24 14:02:29 2026 +0000

    qdev: Add a SsidSizeMode property type

    Introduce a new enum type property allowing to set a Substream ID size
    for HW-accelerated smmuv3. Values are auto and 0..20. The auto value
    allows SSID size property to be derived from host IOMMU capabilities.
    A value of 0 disables SubstreamID, while non-zero values specify the
    SSID size in bits.

    Reviewed-by: Eric Auger <eric.auger@redhat.com>
    Tested-by: Eric Auger <eric.auger@redhat.com>
    Tested-by: Shameer Kolothum <skolothumtho@nvidia.com>
    Acked-by: Markus Armbruster <armbru@redhat.com>
    Signed-off-by: Nathan Chen <nathanc@nvidia.com>
    Message-id: 20260323182454.1416110-5-nathanc@nvidia.com
    Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c
index a402321f42..4aca1d4326 100644
--- a/hw/core/qdev-properties-system.c
+++ b/hw/core/qdev-properties-system.c
@@ -18,6 +18,7 @@
 #include "qapi/qapi-types-block.h"
 #include "qapi/qapi-types-machine.h"
 #include "qapi/qapi-types-migration.h"
+#include "qapi/qapi-types-misc-arm.h"
 #include "qapi/qapi-visit-virtio.h"
 #include "qapi/qmp/qerror.h"
 #include "qemu/ctype.h"
@@ -723,6 +724,19 @@ const PropertyInfo qdev_prop_zero_page_detection = {
     .set_default_value = qdev_propinfo_set_default_value_enum,
 };

+/* --- SsidSizeMode --- */
+
+QEMU_BUILD_BUG_ON(sizeof(SsidSizeMode) != sizeof(int));
+
+const PropertyInfo qdev_prop_ssidsize_mode = {
+    .type = "SsidSizeMode",
+    .description = "ssidsize mode: auto, 0-20",
+    .enum_table = &SsidSizeMode_lookup,
+    .get = qdev_propinfo_get_enum,
+    .set = qdev_propinfo_set_enum,
+    .set_default_value = qdev_propinfo_set_default_value_enum,
+};
+
 /* --- Reserved Region --- */

 /*
diff --git a/include/hw/core/qdev-properties-system.h b/include/hw/core/qdev-properties-system.h
index ec21732ce5..4708885164 100644
--- a/include/hw/core/qdev-properties-system.h
+++ b/include/hw/core/qdev-properties-system.h
@@ -14,6 +14,7 @@ extern const PropertyInfo qdev_prop_multifd_compression;
 extern const PropertyInfo qdev_prop_mig_mode;
 extern const PropertyInfo qdev_prop_granule_mode;
 extern const PropertyInfo qdev_prop_zero_page_detection;
+extern const PropertyInfo qdev_prop_ssidsize_mode;
 extern const PropertyInfo qdev_prop_losttickpolicy;
 extern const PropertyInfo qdev_prop_blockdev_on_error;
 extern const PropertyInfo qdev_prop_bios_chs_trans;
@@ -61,6 +62,8 @@ extern const PropertyInfo qdev_prop_virtio_gpu_output_list;
 #define DEFINE_PROP_ZERO_PAGE_DETECTION(_n, _s, _f, _d) \
     DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_zero_page_detection, \
                        ZeroPageDetection)
+#define DEFINE_PROP_SSIDSIZE_MODE(_n, _s, _f, _d) \
+    DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_ssidsize_mode, SsidSizeMode)
 #define DEFINE_PROP_LOSTTICKPOLICY(_n, _s, _f, _d) \
     DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_losttickpolicy, \
                         LostTickPolicy)
diff --git a/qapi/misc-arm.json b/qapi/misc-arm.json
index f921d740f1..416b4240e2 100644
--- a/qapi/misc-arm.json
+++ b/qapi/misc-arm.json
@@ -45,3 +45,19 @@
 #                     { "version": 3, "emulated": false, "kernel": true } ] }
 ##
 { 'command': 'query-gic-capabilities', 'returns': ['GICCapability'] }
+
+##
+# @SsidSizeMode:
+#
+# SMMUv3 SubstreamID size configuration mode.
+#
+# @auto: derive from host IOMMU capabilities
+#
+# Values 0-20: SSIDSIZE value in bits.  0 disables SubstreamID.
+#
+# Since: 11.0
+##
+{ 'enum': 'SsidSizeMode',
+  'data': [ 'auto', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+            '10', '11', '12', '13', '14', '15', '16', '17', '18',
+            '19', '20' ] } # order matters, see ssidsize_mode_to_value()
diff --git a/qapi/pragma.json b/qapi/pragma.json
index 193bc39059..24aebbe8f5 100644
--- a/qapi/pragma.json
+++ b/qapi/pragma.json
@@ -68,6 +68,7 @@
         'S390CpuEntitlement',
         'S390CpuPolarization',
         'S390CpuState',
+        'SsidSizeMode',
         'String',
         'StringWrapper',
         'SysEmuTarget',