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charset="utf-8" For accelerated SMMUv3, we need nested parent domain creation. Add the callback support so that VFIO can create a nested parent. Reviewed-by: Nicolin Chen Reviewed-by: Jonathan Cameron Signed-off-by: Shameer Kolothum Tested-by: Zhangfei Gao Reviewed-by: Eric Auger Tested-by: Eric Auger Signed-off-by: Shameer Kolothum --- hw/arm/smmuv3-accel.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/hw/arm/smmuv3-accel.c b/hw/arm/smmuv3-accel.c index 2fcd301322..be09cf8b73 100644 --- a/hw/arm/smmuv3-accel.c +++ b/hw/arm/smmuv3-accel.c @@ -10,6 +10,7 @@ #include "qemu/error-report.h" =20 #include "hw/arm/smmuv3.h" +#include "hw/core/iommu.h" #include "hw/pci/pci_bridge.h" #include "hw/pci-host/gpex.h" #include "hw/vfio/pci.h" @@ -129,9 +130,21 @@ static AddressSpace *smmuv3_accel_find_add_as(PCIBus *= bus, void *opaque, } } =20 +static uint64_t smmuv3_accel_get_viommu_flags(void *opaque) +{ + /* + * We return VIOMMU_FLAG_WANT_NESTING_PARENT to inform VFIO core to cr= eate a + * nesting parent which is required for accelerated SMMUv3 support. + * The real HW nested support should be reported from host SMMUv3 and = if + * it doesn't, the nesting parent allocation will fail anyway in VFIO = core. + */ + return VIOMMU_FLAG_WANT_NESTING_PARENT; +} + static const PCIIOMMUOps smmuv3_accel_ops =3D { .supports_address_space =3D smmuv3_accel_supports_as, .get_address_space =3D smmuv3_accel_find_add_as, + .get_viommu_flags =3D smmuv3_accel_get_viommu_flags, }; =20 static void smmuv3_accel_as_init(SMMUv3State *s) --=20 2.43.0