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hw/arm/smmuv3: Implement get_viommu_cap() callback

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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 <nicolinc@nvidia.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com>
Message-id: 20260126104342.253965-12-skolothumtho@nvidia.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Shameer Kolothum
2026-01-29 13:32:04 +00:00
committed by Peter Maydell
parent c7ecb4cf2e
commit fc6dafb98c
1 changed files with 13 additions and 0 deletions
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13
hw/arm/smmuv3-accel.c
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@@ -10,6 +10,7 @@
#include "qemu/error-report.h"
#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,
}
}
static uint64_t smmuv3_accel_get_viommu_flags(void *opaque)
{
/*
* We return VIOMMU_FLAG_WANT_NESTING_PARENT to inform VFIO core to create 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 = {
.supports_address_space = smmuv3_accel_supports_as,
.get_address_space = smmuv3_accel_find_add_as,
.get_viommu_flags = smmuv3_accel_get_viommu_flags,
};
static void smmuv3_accel_as_init(SMMUv3State *s)