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charset="utf-8" To support accelerated SMMUv3 instances, introduce a shared system-wide AddressSpace (shared_as_sysmem) that aliases the global system memory. This shared AddressSpace will be used in a subsequent patch for all vfio-pci devices behind all accelerated SMMUv3 instances within a VM. Sharing a single system AddressSpace ensures that all devices behind accelerated SMMUv3s use the same system address space pointer. This allows VFIO/iommufd to reuse a single IOAS ID in iommufd_cdev_attach(), enabling the Stage-2 page tables to be shared within the VM rather than duplicated for each SMMUv3 instance. Reviewed-by: Nicolin Chen Reviewed-by: Jonathan Cameron Signed-off-by: Shameer Kolothum Reviewed-by: Eric Auger --- hw/arm/smmuv3-accel.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/hw/arm/smmuv3-accel.c b/hw/arm/smmuv3-accel.c index 99ef0db8c4..b2eded743e 100644 --- a/hw/arm/smmuv3-accel.c +++ b/hw/arm/smmuv3-accel.c @@ -11,6 +11,14 @@ #include "hw/arm/smmuv3.h" #include "smmuv3-accel.h" =20 +/* + * The root region aliases the global system memory, and shared_as_sysmem + * provides a shared Address Space referencing it. This Address Space is u= sed + * by all vfio-pci devices behind all accelerated SMMUv3 instances within = a VM. + */ +static MemoryRegion root, sysmem; +static AddressSpace *shared_as_sysmem; + static SMMUv3AccelDevice *smmuv3_accel_get_dev(SMMUState *bs, SMMUPciBus *= sbus, PCIBus *bus, int devfn) { @@ -51,9 +59,27 @@ static const PCIIOMMUOps smmuv3_accel_ops =3D { .get_address_space =3D smmuv3_accel_find_add_as, }; =20 +static void smmuv3_accel_as_init(SMMUv3State *s) +{ + + if (shared_as_sysmem) { + return; + } + + memory_region_init(&root, OBJECT(s), "root", UINT64_MAX); + memory_region_init_alias(&sysmem, OBJECT(s), "smmuv3-accel-sysmem", + get_system_memory(), 0, + memory_region_size(get_system_memory())); + memory_region_add_subregion(&root, 0, &sysmem); + + shared_as_sysmem =3D g_new0(AddressSpace, 1); + address_space_init(shared_as_sysmem, &root, "smmuv3-accel-as-sysmem"); +} + void smmuv3_accel_init(SMMUv3State *s) { SMMUState *bs =3D ARM_SMMU(s); =20 bs->iommu_ops =3D &smmuv3_accel_ops; + smmuv3_accel_as_init(s); } --=20 2.43.0