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qdev: Add a SsidSizeMode property type

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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>
This commit is contained in:
Nathan Chen
2026-03-24 14:02:29 +00:00
committed by Peter Maydell
parent 1a76cc3933
commit 3a3dd64e63
4 changed files with 34 additions and 0 deletions
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14
hw/core/qdev-properties-system.c
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@@ -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 --- */
/*

3
include/hw/core/qdev-properties-system.h
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@@ -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)

16
qapi/misc-arm.json
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@@ -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()

1
qapi/pragma.json
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@@ -68,6 +68,7 @@
'S390CpuEntitlement',
'S390CpuPolarization',
'S390CpuState',
'SsidSizeMode',
'String',
'StringWrapper',
'SysEmuTarget',