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qemu/hw/intc/arm_gicv3_common.c
Philippe Mathieu-Daudé 0c40daf038 hw/intc/arm_gic: Un-inline GIC*/ITS class_name() helpers 
"kvm_arm.h" contains external and internal prototype declarations.
Files under the hw/ directory should only access the KVM external
API.

In order to avoid machine / device models to include "kvm_arm.h"
simply to get the QOM GIC/ITS class name, un-inline each class
name getter to the proper device model file.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230405160454.97436-4-philmd@linaro.org>
2023-06-28 14:27:59 +02:00

625 lines
21 KiB
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/*
* ARM GICv3 support - common bits of emulated and KVM kernel model
*
* Copyright (c) 2012 Linaro Limited
* Copyright (c) 2015 Huawei.
* Copyright (c) 2015 Samsung Electronics Co., Ltd.
* Written by Peter Maydell
* Reworked for GICv3 by Shlomo Pongratz and Pavel Fedin
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "qemu/error-report.h"
#include "hw/core/cpu.h"
#include "hw/intc/arm_gicv3_common.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "gicv3_internal.h"
#include "hw/arm/linux-boot-if.h"
#include "sysemu/kvm.h"
static void gicv3_gicd_no_migration_shift_bug_post_load(GICv3State *cs)
{
if (cs->gicd_no_migration_shift_bug) {
return;
}
/* Older versions of QEMU had a bug in the handling of state save/restore
* to the KVM GICv3: they got the offset in the bitmap arrays wrong,
* so that instead of the data for external interrupts 32 and up
* starting at bit position 32 in the bitmap, it started at bit
* position 64. If we're receiving data from a QEMU with that bug,
* we must move the data down into the right place.
*/
memmove(cs->group, (uint8_t *)cs->group + GIC_INTERNAL / 8,
sizeof(cs->group) - GIC_INTERNAL / 8);
memmove(cs->grpmod, (uint8_t *)cs->grpmod + GIC_INTERNAL / 8,
sizeof(cs->grpmod) - GIC_INTERNAL / 8);
memmove(cs->enabled, (uint8_t *)cs->enabled + GIC_INTERNAL / 8,
sizeof(cs->enabled) - GIC_INTERNAL / 8);
memmove(cs->pending, (uint8_t *)cs->pending + GIC_INTERNAL / 8,
sizeof(cs->pending) - GIC_INTERNAL / 8);
memmove(cs->active, (uint8_t *)cs->active + GIC_INTERNAL / 8,
sizeof(cs->active) - GIC_INTERNAL / 8);
memmove(cs->edge_trigger, (uint8_t *)cs->edge_trigger + GIC_INTERNAL / 8,
sizeof(cs->edge_trigger) - GIC_INTERNAL / 8);
/*
* While this new version QEMU doesn't have this kind of bug as we fix it,
* so it needs to set the flag to true to indicate that and it's necessary
* for next migration to work from this new version QEMU.
*/
cs->gicd_no_migration_shift_bug = true;
}
static int gicv3_pre_save(void *opaque)
{
GICv3State *s = (GICv3State *)opaque;
ARMGICv3CommonClass *c = ARM_GICV3_COMMON_GET_CLASS(s);
if (c->pre_save) {
c->pre_save(s);
}
return 0;
}
static int gicv3_post_load(void *opaque, int version_id)
{
GICv3State *s = (GICv3State *)opaque;
ARMGICv3CommonClass *c = ARM_GICV3_COMMON_GET_CLASS(s);
gicv3_gicd_no_migration_shift_bug_post_load(s);
if (c->post_load) {
c->post_load(s);
}
return 0;
}
static bool virt_state_needed(void *opaque)
{
GICv3CPUState *cs = opaque;
return cs->num_list_regs != 0;
}
static const VMStateDescription vmstate_gicv3_cpu_virt = {
.name = "arm_gicv3_cpu/virt",
.version_id = 1,
.minimum_version_id = 1,
.needed = virt_state_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64_2DARRAY(ich_apr, GICv3CPUState, 3, 4),
VMSTATE_UINT64(ich_hcr_el2, GICv3CPUState),
VMSTATE_UINT64_ARRAY(ich_lr_el2, GICv3CPUState, GICV3_LR_MAX),
VMSTATE_UINT64(ich_vmcr_el2, GICv3CPUState),
VMSTATE_END_OF_LIST()
}
};
static int vmstate_gicv3_cpu_pre_load(void *opaque)
{
GICv3CPUState *cs = opaque;
/*
* If the sre_el1 subsection is not transferred this
* means SRE_EL1 is 0x7 (which might not be the same as
* our reset value).
*/
cs->icc_sre_el1 = 0x7;
return 0;
}
static bool icc_sre_el1_reg_needed(void *opaque)
{
GICv3CPUState *cs = opaque;
return cs->icc_sre_el1 != 7;
}
const VMStateDescription vmstate_gicv3_cpu_sre_el1 = {
.name = "arm_gicv3_cpu/sre_el1",
.version_id = 1,
.minimum_version_id = 1,
.needed = icc_sre_el1_reg_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64(icc_sre_el1, GICv3CPUState),
VMSTATE_END_OF_LIST()
}
};
static bool gicv4_needed(void *opaque)
{
GICv3CPUState *cs = opaque;
return cs->gic->revision > 3;
}
const VMStateDescription vmstate_gicv3_gicv4 = {
.name = "arm_gicv3_cpu/gicv4",
.version_id = 1,
.minimum_version_id = 1,
.needed = gicv4_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64(gicr_vpropbaser, GICv3CPUState),
VMSTATE_UINT64(gicr_vpendbaser, GICv3CPUState),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_gicv3_cpu = {
.name = "arm_gicv3_cpu",
.version_id = 1,
.minimum_version_id = 1,
.pre_load = vmstate_gicv3_cpu_pre_load,
.fields = (VMStateField[]) {
VMSTATE_UINT32(level, GICv3CPUState),
VMSTATE_UINT32(gicr_ctlr, GICv3CPUState),
VMSTATE_UINT32_ARRAY(gicr_statusr, GICv3CPUState, 2),
VMSTATE_UINT32(gicr_waker, GICv3CPUState),
VMSTATE_UINT64(gicr_propbaser, GICv3CPUState),
VMSTATE_UINT64(gicr_pendbaser, GICv3CPUState),
VMSTATE_UINT32(gicr_igroupr0, GICv3CPUState),
VMSTATE_UINT32(gicr_ienabler0, GICv3CPUState),
VMSTATE_UINT32(gicr_ipendr0, GICv3CPUState),
VMSTATE_UINT32(gicr_iactiver0, GICv3CPUState),
VMSTATE_UINT32(edge_trigger, GICv3CPUState),
VMSTATE_UINT32(gicr_igrpmodr0, GICv3CPUState),
VMSTATE_UINT32(gicr_nsacr, GICv3CPUState),
VMSTATE_UINT8_ARRAY(gicr_ipriorityr, GICv3CPUState, GIC_INTERNAL),
VMSTATE_UINT64_ARRAY(icc_ctlr_el1, GICv3CPUState, 2),
VMSTATE_UINT64(icc_pmr_el1, GICv3CPUState),
VMSTATE_UINT64_ARRAY(icc_bpr, GICv3CPUState, 3),
VMSTATE_UINT64_2DARRAY(icc_apr, GICv3CPUState, 3, 4),
VMSTATE_UINT64_ARRAY(icc_igrpen, GICv3CPUState, 3),
VMSTATE_UINT64(icc_ctlr_el3, GICv3CPUState),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription * []) {
&vmstate_gicv3_cpu_virt,
&vmstate_gicv3_cpu_sre_el1,
&vmstate_gicv3_gicv4,
NULL
}
};
static int gicv3_pre_load(void *opaque)
{
GICv3State *cs = opaque;
/*
* The gicd_no_migration_shift_bug flag is used for migration compatibility
* for old version QEMU which may have the GICD bmp shift bug under KVM mode.
* Strictly, what we want to know is whether the migration source is using
* KVM. Since we don't have any way to determine that, we look at whether the
* destination is using KVM; this is close enough because for the older QEMU
* versions with this bug KVM -> TCG migration didn't work anyway. If the
* source is a newer QEMU without this bug it will transmit the migration
* subsection which sets the flag to true; otherwise it will remain set to
* the value we select here.
*/
if (kvm_enabled()) {
cs->gicd_no_migration_shift_bug = false;
}
return 0;
}
static bool needed_always(void *opaque)
{
return true;
}
const VMStateDescription vmstate_gicv3_gicd_no_migration_shift_bug = {
.name = "arm_gicv3/gicd_no_migration_shift_bug",
.version_id = 1,
.minimum_version_id = 1,
.needed = needed_always,
.fields = (VMStateField[]) {
VMSTATE_BOOL(gicd_no_migration_shift_bug, GICv3State),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_gicv3 = {
.name = "arm_gicv3",
.version_id = 1,
.minimum_version_id = 1,
.pre_load = gicv3_pre_load,
.pre_save = gicv3_pre_save,
.post_load = gicv3_post_load,
.priority = MIG_PRI_GICV3,
.fields = (VMStateField[]) {
VMSTATE_UINT32(gicd_ctlr, GICv3State),
VMSTATE_UINT32_ARRAY(gicd_statusr, GICv3State, 2),
VMSTATE_UINT32_ARRAY(group, GICv3State, GICV3_BMP_SIZE),
VMSTATE_UINT32_ARRAY(grpmod, GICv3State, GICV3_BMP_SIZE),
VMSTATE_UINT32_ARRAY(enabled, GICv3State, GICV3_BMP_SIZE),
VMSTATE_UINT32_ARRAY(pending, GICv3State, GICV3_BMP_SIZE),
VMSTATE_UINT32_ARRAY(active, GICv3State, GICV3_BMP_SIZE),
VMSTATE_UINT32_ARRAY(level, GICv3State, GICV3_BMP_SIZE),
VMSTATE_UINT32_ARRAY(edge_trigger, GICv3State, GICV3_BMP_SIZE),
VMSTATE_UINT8_ARRAY(gicd_ipriority, GICv3State, GICV3_MAXIRQ),
VMSTATE_UINT64_ARRAY(gicd_irouter, GICv3State, GICV3_MAXIRQ),
VMSTATE_UINT32_ARRAY(gicd_nsacr, GICv3State,
DIV_ROUND_UP(GICV3_MAXIRQ, 16)),
VMSTATE_STRUCT_VARRAY_POINTER_UINT32(cpu, GICv3State, num_cpu,
vmstate_gicv3_cpu, GICv3CPUState),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription * []) {
&vmstate_gicv3_gicd_no_migration_shift_bug,
NULL
}
};
void gicv3_init_irqs_and_mmio(GICv3State *s, qemu_irq_handler handler,
const MemoryRegionOps *ops)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(s);
int i;
int cpuidx;
/* For the GIC, also expose incoming GPIO lines for PPIs for each CPU.
* GPIO array layout is thus:
* [0..N-1] spi
* [N..N+31] PPIs for CPU 0
* [N+32..N+63] PPIs for CPU 1
* ...
*/
i = s->num_irq - GIC_INTERNAL + GIC_INTERNAL * s->num_cpu;
qdev_init_gpio_in(DEVICE(s), handler, i);
for (i = 0; i < s->num_cpu; i++) {
sysbus_init_irq(sbd, &s->cpu[i].parent_irq);
}
for (i = 0; i < s->num_cpu; i++) {
sysbus_init_irq(sbd, &s->cpu[i].parent_fiq);
}
for (i = 0; i < s->num_cpu; i++) {
sysbus_init_irq(sbd, &s->cpu[i].parent_virq);
}
for (i = 0; i < s->num_cpu; i++) {
sysbus_init_irq(sbd, &s->cpu[i].parent_vfiq);
}
memory_region_init_io(&s->iomem_dist, OBJECT(s), ops, s,
"gicv3_dist", 0x10000);
sysbus_init_mmio(sbd, &s->iomem_dist);
s->redist_regions = g_new0(GICv3RedistRegion, s->nb_redist_regions);
cpuidx = 0;
for (i = 0; i < s->nb_redist_regions; i++) {
char *name = g_strdup_printf("gicv3_redist_region[%d]", i);
GICv3RedistRegion *region = &s->redist_regions[i];
region->gic = s;
region->cpuidx = cpuidx;
cpuidx += s->redist_region_count[i];
memory_region_init_io(&region->iomem, OBJECT(s),
ops ? &ops[1] : NULL, region, name,
s->redist_region_count[i] * gicv3_redist_size(s));
sysbus_init_mmio(sbd, &region->iomem);
g_free(name);
}
}
static void arm_gicv3_common_realize(DeviceState *dev, Error **errp)
{
GICv3State *s = ARM_GICV3_COMMON(dev);
int i, rdist_capacity, cpuidx;
/*
* This GIC device supports only revisions 3 and 4. The GICv1/v2
* is a separate device.
* Note that subclasses of this device may impose further restrictions
* on the GIC revision: notably, the in-kernel KVM GIC doesn't
* support GICv4.
*/
if (s->revision != 3 && s->revision != 4) {
error_setg(errp, "unsupported GIC revision %d", s->revision);
return;
}
if (s->num_irq > GICV3_MAXIRQ) {
error_setg(errp,
"requested %u interrupt lines exceeds GIC maximum %d",
s->num_irq, GICV3_MAXIRQ);
return;
}
if (s->num_irq < GIC_INTERNAL) {
error_setg(errp,
"requested %u interrupt lines is below GIC minimum %d",
s->num_irq, GIC_INTERNAL);
return;
}
if (s->num_cpu == 0) {
error_setg(errp, "num-cpu must be at least 1");
return;
}
/* ITLinesNumber is represented as (N / 32) - 1, so this is an
* implementation imposed restriction, not an architectural one,
* so we don't have to deal with bitfields where only some of the
* bits in a 32-bit word should be valid.
*/
if (s->num_irq % 32) {
error_setg(errp,
"%d interrupt lines unsupported: not divisible by 32",
s->num_irq);
return;
}
if (s->lpi_enable && !s->dma) {
error_setg(errp, "Redist-ITS: Guest 'sysmem' reference link not set");
return;
}
rdist_capacity = 0;
for (i = 0; i < s->nb_redist_regions; i++) {
rdist_capacity += s->redist_region_count[i];
}
if (rdist_capacity != s->num_cpu) {
error_setg(errp, "Capacity of the redist regions(%d) "
"does not match the number of vcpus(%d)",
rdist_capacity, s->num_cpu);
return;
}
if (s->lpi_enable) {
address_space_init(&s->dma_as, s->dma,
"gicv3-its-sysmem");
}
s->cpu = g_new0(GICv3CPUState, s->num_cpu);
for (i = 0; i < s->num_cpu; i++) {
CPUState *cpu = qemu_get_cpu(i);
uint64_t cpu_affid;
s->cpu[i].cpu = cpu;
s->cpu[i].gic = s;
/* Store GICv3CPUState in CPUARMState gicv3state pointer */
gicv3_set_gicv3state(cpu, &s->cpu[i]);
/* Pre-construct the GICR_TYPER:
* For our implementation:
* Top 32 bits are the affinity value of the associated CPU
* CommonLPIAff == 01 (redistributors with same Aff3 share LPI table)
* Processor_Number == CPU index starting from 0
* DPGS == 0 (GICR_CTLR.DPG* not supported)
* Last == 1 if this is the last redistributor in a series of
* contiguous redistributor pages
* DirectLPI == 0 (direct injection of LPIs not supported)
* VLPIS == 1 if vLPIs supported (GICv4 and up)
* PLPIS == 1 if LPIs supported
*/
cpu_affid = object_property_get_uint(OBJECT(cpu), "mp-affinity", NULL);
/* The CPU mp-affinity property is in MPIDR register format; squash
* the affinity bytes into 32 bits as the GICR_TYPER has them.
*/
cpu_affid = ((cpu_affid & 0xFF00000000ULL) >> 8) |
(cpu_affid & 0xFFFFFF);
s->cpu[i].gicr_typer = (cpu_affid << 32) |
(1 << 24) |
(i << 8);
if (s->lpi_enable) {
s->cpu[i].gicr_typer |= GICR_TYPER_PLPIS;
if (s->revision > 3) {
s->cpu[i].gicr_typer |= GICR_TYPER_VLPIS;
}
}
}
/*
* Now go through and set GICR_TYPER.Last for the final
* redistributor in each region.
*/
cpuidx = 0;
for (i = 0; i < s->nb_redist_regions; i++) {
cpuidx += s->redist_region_count[i];
s->cpu[cpuidx - 1].gicr_typer |= GICR_TYPER_LAST;
}
s->itslist = g_ptr_array_new();
}
static void arm_gicv3_finalize(Object *obj)
{
GICv3State *s = ARM_GICV3_COMMON(obj);
g_free(s->redist_region_count);
}
static void arm_gicv3_common_reset_hold(Object *obj)
{
GICv3State *s = ARM_GICV3_COMMON(obj);
int i;
for (i = 0; i < s->num_cpu; i++) {
GICv3CPUState *cs = &s->cpu[i];
cs->level = 0;
cs->gicr_ctlr = 0;
if (s->lpi_enable) {
/* Our implementation supports clearing GICR_CTLR.EnableLPIs */
cs->gicr_ctlr |= GICR_CTLR_CES;
}
cs->gicr_statusr[GICV3_S] = 0;
cs->gicr_statusr[GICV3_NS] = 0;
cs->gicr_waker = GICR_WAKER_ProcessorSleep | GICR_WAKER_ChildrenAsleep;
cs->gicr_propbaser = 0;
cs->gicr_pendbaser = 0;
cs->gicr_vpropbaser = 0;
cs->gicr_vpendbaser = 0;
/* If we're resetting a TZ-aware GIC as if secure firmware
* had set it up ready to start a kernel in non-secure, we
* need to set interrupts to group 1 so the kernel can use them.
* Otherwise they reset to group 0 like the hardware.
*/
if (s->irq_reset_nonsecure) {
cs->gicr_igroupr0 = 0xffffffff;
} else {
cs->gicr_igroupr0 = 0;
}
cs->gicr_ienabler0 = 0;
cs->gicr_ipendr0 = 0;
cs->gicr_iactiver0 = 0;
cs->edge_trigger = 0xffff;
cs->gicr_igrpmodr0 = 0;
cs->gicr_nsacr = 0;
memset(cs->gicr_ipriorityr, 0, sizeof(cs->gicr_ipriorityr));
cs->hppi.prio = 0xff;
cs->hpplpi.prio = 0xff;
cs->hppvlpi.prio = 0xff;
/* State in the CPU interface must *not* be reset here, because it
* is part of the CPU's reset domain, not the GIC device's.
*/
}
/* For our implementation affinity routing is always enabled */
if (s->security_extn) {
s->gicd_ctlr = GICD_CTLR_ARE_S | GICD_CTLR_ARE_NS;
} else {
s->gicd_ctlr = GICD_CTLR_DS | GICD_CTLR_ARE;
}
s->gicd_statusr[GICV3_S] = 0;
s->gicd_statusr[GICV3_NS] = 0;
memset(s->group, 0, sizeof(s->group));
memset(s->grpmod, 0, sizeof(s->grpmod));
memset(s->enabled, 0, sizeof(s->enabled));
memset(s->pending, 0, sizeof(s->pending));
memset(s->active, 0, sizeof(s->active));
memset(s->level, 0, sizeof(s->level));
memset(s->edge_trigger, 0, sizeof(s->edge_trigger));
memset(s->gicd_ipriority, 0, sizeof(s->gicd_ipriority));
memset(s->gicd_irouter, 0, sizeof(s->gicd_irouter));
memset(s->gicd_nsacr, 0, sizeof(s->gicd_nsacr));
/* GICD_IROUTER are UNKNOWN at reset so in theory the guest must
* write these to get sane behaviour and we need not populate the
* pointer cache here; however having the cache be different for
* "happened to be 0 from reset" and "guest wrote 0" would be
* too confusing.
*/
gicv3_cache_all_target_cpustates(s);
if (s->irq_reset_nonsecure) {
/* If we're resetting a TZ-aware GIC as if secure firmware
* had set it up ready to start a kernel in non-secure, we
* need to set interrupts to group 1 so the kernel can use them.
* Otherwise they reset to group 0 like the hardware.
*/
for (i = GIC_INTERNAL; i < s->num_irq; i++) {
gicv3_gicd_group_set(s, i);
}
}
s->gicd_no_migration_shift_bug = true;
}
static void arm_gic_common_linux_init(ARMLinuxBootIf *obj,
bool secure_boot)
{
GICv3State *s = ARM_GICV3_COMMON(obj);
if (s->security_extn && !secure_boot) {
/* We're directly booting a kernel into NonSecure. If this GIC
* implements the security extensions then we must configure it
* to have all the interrupts be NonSecure (this is a job that
* is done by the Secure boot firmware in real hardware, and in
* this mode QEMU is acting as a minimalist firmware-and-bootloader
* equivalent).
*/
s->irq_reset_nonsecure = true;
}
}
static Property arm_gicv3_common_properties[] = {
DEFINE_PROP_UINT32("num-cpu", GICv3State, num_cpu, 1),
DEFINE_PROP_UINT32("num-irq", GICv3State, num_irq, 32),
DEFINE_PROP_UINT32("revision", GICv3State, revision, 3),
DEFINE_PROP_BOOL("has-lpi", GICv3State, lpi_enable, 0),
DEFINE_PROP_BOOL("has-security-extensions", GICv3State, security_extn, 0),
/*
* Compatibility property: force 8 bits of physical priority, even
* if the CPU being emulated should have fewer.
*/
DEFINE_PROP_BOOL("force-8-bit-prio", GICv3State, force_8bit_prio, 0),
DEFINE_PROP_ARRAY("redist-region-count", GICv3State, nb_redist_regions,
redist_region_count, qdev_prop_uint32, uint32_t),
DEFINE_PROP_LINK("sysmem", GICv3State, dma, TYPE_MEMORY_REGION,
MemoryRegion *),
DEFINE_PROP_END_OF_LIST(),
};
static void arm_gicv3_common_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
ResettableClass *rc = RESETTABLE_CLASS(klass);
ARMLinuxBootIfClass *albifc = ARM_LINUX_BOOT_IF_CLASS(klass);
rc->phases.hold = arm_gicv3_common_reset_hold;
dc->realize = arm_gicv3_common_realize;
device_class_set_props(dc, arm_gicv3_common_properties);
dc->vmsd = &vmstate_gicv3;
albifc->arm_linux_init = arm_gic_common_linux_init;
}
static const TypeInfo arm_gicv3_common_type = {
.name = TYPE_ARM_GICV3_COMMON,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(GICv3State),
.class_size = sizeof(ARMGICv3CommonClass),
.class_init = arm_gicv3_common_class_init,
.instance_finalize = arm_gicv3_finalize,
.abstract = true,
.interfaces = (InterfaceInfo []) {
{ TYPE_ARM_LINUX_BOOT_IF },
{ },
},
};
static void register_types(void)
{
type_register_static(&arm_gicv3_common_type);
}
type_init(register_types)
const char *gicv3_class_name(void)
{
if (kvm_irqchip_in_kernel()) {
return "kvm-arm-gicv3";
} else {
if (kvm_enabled()) {
error_report("Userspace GICv3 is not supported with KVM");
exit(1);
}
return "arm-gicv3";
}
}
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